| 2021 |
Linear system identification versus physical modeling of lateral-longitudinal vehicle dynamics. B. A. Hernandez Vicente, S. S. James, S. R. Anderson. Accurate physical modeling of vehicle dynamics requires extensive a priori knowledge of the studied vehicle. In contrast, data-driven modeling approaches require only a set of data that are a good account of the vehicles driving envelope. In this brief, we compare, for the first time, the prediction capabilities of both approaches applied to a large-scale real-world driving data set. The data set contains several cornering maneuvers, acceleration, and deceleration stages and was collected over public roads. Linear and nonlinear physical models were identified through nonlinear optimization of their unknown parameters. Closed-form subspace identification methods were used to initialize the estimate of a linear state-space model, and the initialization was then refined through nonlinear optimization. The optimized models were validated against 59 km of independent driving data. The model fits, in the longitudinal velocity, were 68.9% versus 80.2% for the nonlinear physical model and linear data-driven (second-order) model, respectively, and, in the yaw rate, 43.0% versus 63.5%. These results show that, for this vehicle, a simple linear data-driven model outperformed both linear and nonlinear physical models under real-world driving conditions. This has important implications for control design approaches in autonomous vehicles. |
EEE Transactions on Control Systems Technology, 29(3), pp. 1380-1387 |
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| 2020 |
On the Wetting Translucency of Hexagonal Boron Nitride. Enrique Wagemann, Yanbin Wang, Siddhartha Das and Sushanta K. Mitra. When a liquid drop sits on an atomically thin layer of a 2D van der Waals (vdW) solid (like graphene) supported by a hydrophilic material, it is possible that the drop demonstrates an equilibrium contact angle that is influenced by this underlying hydrophilic material and hence is different from that observed on the bulk 2D material (e.g., graphite) surface. Such a behavior is known as the wetting translucency effect. While the wetting translucency effect of graphene has been extensively studied, the wetting translucency of hexagonal boron nitride (hBN) remains largely unexplored despite significant similarities in structural properties between these materials. In this study, we probe the wetting translucency of hBN. For this purpose, we conduct molecular dynamics simulations of water droplets and water films on hBN layers supported on a gold-like hydrophilic substrate. Our results show that for a substrate coated by monolayer hBN (coated substrate), depending on the contact distance between underlying substrate and hBN, an increase in the hydrophilicity of the underlying surface causes a monotonic increase in the overall adhesion energy between water and the coated substrate and a monotonic decrease in the contact angle of a drop on the coated substrate. For an increasing number of stacked hBN layers, the wettability of coated substrate becomes independent of the wettability of the underlying solid. Accordingly, our results confirm a distinct wetting translucency nature of hBN very similar to that observed in graphene.
https://doi.org/10.1039/D0CP00200C |
Physical Chemistry Chemical Physics |
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| 2020 |
Wettability of Nanostructured Hexagonal Boron Nitride Surfaces: Molecular Dynamics Insights on the Effect of Wetting Anisotropy . Enrique Wagemann, Yanbin Wang, Siddhartha Das and Sushanta K. Mitra. Nanostructured van der Waals (vdW) layered materials hold great potential for achieving smart surfaces with controllable wettability. Inspired by this possibility, we conduct Molecular Dynamics (MD) simulations of the wetting of nanostructured hexagonal boron nitride (hBN) surfaces. The nanostructure consists of periodically placed nanopillars made of hBN nanoribbons. We demonstrate that the polarity effect of the nanoribbon edges triggers wetting anisotropy of the nanoribbons: the vertical edges of the nanoribbons demonstrate a different wetting behavior as compared to the flat surfaces of the nanoribbons. Depending on the nature of the edge of the nanoribbon (armchair or zigzag), these vertical edges can be more hydrophilic for the zigzag edges or more hydrophobic for the armchair edges than the flat part. Such differences ensure that the nanostructured hBN surfaces become more hydrophilic (hydrophobic) as compared to the flat non-nanostructured hBN surfaces for cases where the edges of the nanoribbon are more hydrophilic (hydrophobic) than the flat part. Overall, the present study develops a most remarkable design space where by introducing nanopillars/nanoribbons on hBN and by merely changing the nature of the edges of these nanopillars, one can ensure atomistically thin coating of hBN with a wide range of wettability.
https://doi.org/10.1039/C9CP06708F |
Physical Chemistry Chemical Physics |
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| 2019 |
Reducing mining footprint by matching haul fleet demand and route-oriented tire types. R. Pascual, M. Román, M. López-Campos, M. Hitch, E. Rodovalho. Off-The-Road (OTR) tires represent an important part of the operational costs of the mining industry. Each year, a typical operation consumes hundreds of tires. In terms of operational costs, tires are only second to fuel, translating into several USD millions per year for an average mine operation. In addition, tires affect equipment performance and availability and, as a consequence, put at risk the capacity of the haul fleets to deliver the production targets. OTR tire lifespan depends on proper type selection. Each tire-type implies choosing a combination of rubber compounds and geometric specifications that are suited to road parameters. Medium and long term mining plans specify routes and production goals. In general, each route has a specific optimal tire type. The traditional approach is to consider the most demanding conditions and selecting a single tire type for the whole fleet . In such a way, truck dispatch is flexible as any truck can haul on any route. A drawback is that this one-size-fits-all policy increases tire consumption as the worst-case route sets the type of tire for the entire fleet. The above builds an interesting case for optimizing tire selection and haul fleet usage schedule as both decisions can be relevant in search for reducing tire consumption, decrease operational costs, and assure production plan adherence. As tire type may influence haul cycle times, assignment of trucks to different routes should also be considered. This work introduces a novel methodology for setting a usage allocation plan for the haul fleet and selecting route-oriented tire types. We test our methodology using a medium size open-pit operation in northern Chile. The case study shows a tire consumption reduction of 7.3% with respect to the traditional approach over a 5 year time span. Net present tire costs are reduced by USD 2.7 millions (-7.2%). Our methodology presents a novel approach to both reducing costs and achieving long-term production plans. |
Journal of Cleaner production |
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| 2019 |
A Novel Deep Capsule Neural Network for Remaining Useful Life Estimation. Andrés Ruiz-Tagle Palazuelos, Enrique López Droguett1 and Rodrigo Pascual. With the availability of cheaper multisensor systems, one has access to massive and multi-dimensional sensor data for fault diagnostics and prognostics. However, from a time, engineering and computational perspective, it is often cost prohibitive to manually extract useful features and to label all the data. To address this challenges, deep learning techniques have been used in the recent years. Within these, convolutional neural networks (CNN) have shown remarkable performance in fault diagnostics and prognostics. However, CNNs do present limitations from a prognostics and health management perspective: to improve its feature extraction generalization capabilities and reduce computation time, ill-based pooling operations are employed, which require sub-sampling of the data, thus loosing potentially valuable information regarding an assets degradation process. Capsule Neural Networks (CapsNets) have been recently proposed to address these problems with strong results in computer vision related classification tasks. This has motivated us to extend CapsNets for fault prognostics and, in particular, remaining useful life estimation. The proposed model, architecture and algorithm are tested and compared to other state-of-the art deep learning models on the benchmark C-MAPPS turbofans dataset. The results indicate that the proposed CapsNets are a promising approach for RUL prognosticsfrom multi-dimensional sensor data. |
Journal of Risk and Reliability |
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| 2019 |
Water Flow in Silica Nanopores Coated by Carbon Nanotubes from a Wetting Translucency Perspective . Enrique Wagemann, Jens H. Walther, Eduardo R. Cruz-Chú, and Harvey A. Zambrano. Nearly frictionless water transport makes carbon nanotubes promising materials for use as conduits in nanofluidic applications. Here, we conduct molecular dynamics simulations of water flow within amorphous silica nanopores coated by a (39,39) single-walled carbon nanotube (SWCNT). Our atomistic models describe the interaction between water and pore walls based on two possible scenarios, translucency and opacity to wetting of a SWCNT. Simulation results indicate that the SWCNT coating enhances water flow through silica pores ca. 10 times compared to predictions from the classical HagenPoiseuille relation. By varying the strength of the waterpore interaction, we study the relationship between surface wettability and hydrodynamic slippage. We observe an increase in the slip length for higher values of water contact angle. Moreover, cases with SWCNT opacity and translucency to wetting display a substantial difference in the computed slippage, showing that the water contact angle is not the only factor that determines the slip boundary condition under nanoconfinement. We attribute this disparity to the corrugation of the potential energy landscape at the inner pore wall. The present study provides a theoretical framework for the use of carbon nanotube-based coatings in designing more efficient nanofluidic conduits.
https://doi.org/10.1021/acs.jpcc.9b05294 |
J. Phys. Chem. C 2019, 123, 42, 2563525642 |
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| 2019 |
Stabilizing predictive control with persistence of excitation for constrained linear systems. B. A. Hernandez Vicente, P. A. Trodden. A new adaptive predictive controller for constrained linear systems is presented. The main feature of the proposed controller is the partition of the input in two components. The first part is used to persistently excite the system, in order to guarantee accurate and convergent parameter estimates in a deterministic framework. An MPC-inspired receding horizon optimization problem is developed to achieve the required excitation in a manner that is optimal for the plant. The remaining control action is employed by a conventional tube MPC controller to regulate the plant in the presence of parametric uncertainty and the excitation generated for estimation purposes. Constraint satisfaction, robust exponential stability, and convergence of the estimates are guaranteed under design conditions mildly more demanding than that of standard MPC implementations. |
Systems & Control Letters, 126, pp. 5866 |
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| 2019 |
Switching tube-based MPC: Characterization of minimum dwell-time for feasible and robustly stable switching. B. A. Hernandez Vicente, P. A. Trodden. We study the problem of characterizing mode dependent dwell-times that guarantee safe and stable operation of disturbed switching linear systems in a model predictive control (MPC) framework. We assume the switching instances are not known a priori, but instantly at the moment of switching. We first characterize dwell-times that ensure feasible and stable switching between independently designed robust MPC controllers by means of the well established exponential stability result available in the MPC literature. Then, we employ the concept of multiset invariance to improve on our previous results, and obtain an exponential stability guarantee for the switching closed-loop dynamics. The theoretical findings are illustrated via a numerical example. |
IEEE Transactions on Automatic Control, 64(10), pp. 43454352 |
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| 2018 |
Graphical Analysis for Overall Effectiveness Management: A Graphical Method to Support Operation and Maintenance Performance Assessment. P. Viveros, F. Kristjanpoller, M. López, A. Crespo, R. Pascual. This article presents a graphical tool for the monitoring of performance indicators called GAOEM (Graphical Analysis for Overall Effectiveness Management). GAOEM is used in a real industrial process, integrating the main indicators of maintenance and operations management and performing an adaptation on the indicator of the overall effectiveness, the OEE/OAE. GAOEM facilitates control and analysis by using specific indicators (graphic panel). It also facilitates an efficient reading and interpreting of the data, enriching the analysis, the search for phenomena of interest and improvement opportunities and supporting the decision making. GAOEM requires three categories of inputs data, which are: interventions data, time data and production/process data. With this information the basic performance indicators are calculated, being these indicators fundamental for the control and monitoring of the performance level. Later these indicators will be the base for calculation of both partial and total effectiveness. GAOEM can be used as a diagnosis, analysis, control and monitoring tool for the indicators of interest, as well as a tool for searching of phenomena typical of the life cycle of assets and also those that result from improper operation and/or maintenance, identifying its root causes. |
Quality and Reliability Engineering International |
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| 2018 |
An asset-management oriented methodology for mine haul-fleet usage scheduling. C. Nakousi, R. Pascual, A. Anani, F. Kristjanpoller, P. Lillo. Different complexities force mining companies to find efficient ways to respond to demand challenges and ensure long-term sustainability. It explains, in part, the increase in the use of prescriptive analytics to optimize physical-asset life-cycle costs and decrease greenhouse gas (GHG) emissions. Mining, being an asset-intensive industry, provides huge improvement opportunities. This is especially true for scheduling practices of mine haulage fleet usage in long term planning. Fleet aging implies important cost increases in maintenance and repair (M&R), and overhauls. Fleets are often heterogeneous in term of truck performance, fuel consumption and GHG emissions. Sub-optimal scheduling decisions may induce severe cost over-runs and increased emissions. This paper proposes an original mixed integer programming formulation to optimize mine haulage equipment scheduling in the long term. The model considers the effects of equipment aging, fuel consumption, payload capacity and cycle times. Our formulation handles different aspects that according to author's knowledge have not been considered in the literature as a whole: (i) joint minimization of fuel, M&R, and overhaul costs, (ii) reduction of GHG emissions, (iii) heterogeneous equipment performance metrics, (iv)increase in cycle times due to mine aging. The case study shows a cost reduction of 13% in the discounted .ows associated with fuel, M&R, and overhauls in a time horizon of 10 years. This .gure translates into an NPV gain of 13.1 million USD. Additionally, GHG emissions are reduced by an average of 3,470 tons/year or 11% overall. |
Reliability Engineering and System Safety |
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| 2018 |
Corrigendum to "Reliability Assessment Methodology for Massive Manufacturing Using Multi-Function Equipment". M. López-Campos, F. Kristjanpoller, P. Viveros, and R. Pascual. - |
Complexity |
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| 2018 |
A special issue on Statistical methods in mining industry. Orietta Nicolis and Rodrigo Pascual. In this special issue, we selected four papers where some statistical methods are used for taking decisions, assessing the security of mining equipments, and predicting the proportion of a certain mineral in rock samples. While the papers of Neira et al and Stehlík et al use the concepts of the reliability theory based on typical failure distributions (such as the Weibull, Gamma, and Beta distributions), the work of Jiang et al uses nonparametric statistical methods for analyzing the failures. A different issue has been proposed by Huerta et al for predicting the proportion of a mineral in rocks. In particular, in the work of Neira et al, a statistical method inspired from reliability engineering has been proposed for monitoring the health of microseismic sensing networks, that is, its capability to properly register all the microseismic activity above a certain energy level. The monitoring of the health of a microseismic network has been addressed in this work by describing and characterizing the faulty behavior of each sensor in analogy with standard ideas and methods of reliability theory. In particular, the proposed method analyzes two relevant features of each of the sensors' behavior, namely, what type of noise is or might be affecting the registering process and how effective at registering microseisms the sensor is. Once the noisy activations and the types of noise have been identified, a Weibull distribution has been fitted to the time differences of consecutive noisy activations (failures). The estimated parameters are then used to compute the reliability of each sensor with respect to the different types of noise. In order to estimate the noise that is present in the seismograms, three indicators have been proposed: two of these are based on the power spectral density (PSD) and the third is given by the signal-to-noise ratio (SNR). In all cases, the computed value of the indicator is compared with a threshold to assess if an activation is noisy or not. Then, the ratio of activations is extracted by evaluating the quotient between the number of satisfactory activations registered by a sensor and the number of satisfactory activations that the sensor was supposed to register in a given period of time. Also, the authors propose a new indicator, computed for each individual sensor, that conveys both the information of the reliability of the sensors and their ratio of activations. The proposed methodology is then applied to the microseismic data registered at the Chilean underground mine El Teniente. The study illustrates the capability of the proposed methodology to discriminate and rank sensors with satisfactory, poor, or defective sensing performances, as well as to characterize their failure profile or type of information that can be used to plan or optimize the network maintenance procedures. |
Applied Stochastic Modelling in Business and Industry |
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| 2018 |
Prediction of the minimum fluidization velocity of particles of sugarcane bagasse. Nestor Proenza Pérez, Daniel Travieso Pedroso, Einara Blanco Machin, Julio Santana Antunes, Ricardo Alan Verdú Ramos, Jose Luz Silveira. This study refers to an experimental analysis of the fluid-dynamics of particles of sugarcane bagasse in a fluidization column with an internal diameter of 190 mm, which determined the minimum fluidization velocity of the particles with different characteristic diameters (0 < dp<9.5 mm), using air as fluidization means. The results have shown that the minimum fluidization velocity has a tendency to increase as the diameter of the particle increases. However, in a certain range of diameter (0.88 mm < dp<9.5 mm), where the particles have a high aspect ratio (length/diameter), it has not been possible to fluidize them. High superficial air velocities have been used, mainly due to the strong trend to interlace and to develop high adhesion forces in this type of particles, as well as the high porosity that is displayed. Based on the experimental results, two new models have been developed in order to determine the minimum fluidization velocity and the complete fluidization velocity of the sugarcane bagasse with diameters that range from 0.075 to 0.445 mm. The comparisons have been made by using correlations from the literature for the determination of the minimum fluidization velocity, and the experimental results have shown that the new suggested correlations finely predict this parameter, with a maximum error range of 6%, respecting the experimental values. |
Biomass and Bioenergy 109, pp. 249-256, 2018 |
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| 2018 |
Correlation between mechanical and microstructural properties of vulcanized polyisoprene, polychloroprene, and nitrile-butadiene rubber subjected to accelerated thermal aging. Fabián E Hernández, C Medina, G Moraga, J Ramírez, AF Jaramillo, R Báez-Cruz, MF Meléndrez, P Flores. he purpose of this work was to correlate the effects of thermal aging on the macroscopic properties and microstructural changes for three vulcanized rubber types. The materials were subjected to accelerated thermal aging for periods between 0 and 168 h at 100°C. This aging was evaluated by investigating the mechanical properties and by Fourier transform infrared (FTIR) and Raman analysis. The results showed that subjecting the materials to thermal aging for a longer time decreased the elongation at break and tear strength and increased the hardness, while tensile strength exhibited different behavior and followed a different trend. The spectroscopy analyses indicated that there is a decrease in the amount of C=C present in the polymer as the aging time increased, which could be identified by the decrease in peak intensity at 1537 and 1600 cm−1 in the FTIR and Raman spectrum, respectively. These results were attributed mainly to an increase in cross-link density, which caused degradation of the material, essentially by a loss of ductility. A good linear relation (R2 approximately 0.95) between changes in the intensity of FTIR peaks for the C=C signal and changes in elongation at break and hardness was found, concluding that these are good indicators of degradation in elastomers.
https://doi.org/10.1177/0095244318798171 |
Journal of Elastomers & Plastics, In Press, 2018 |
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| 2018 |
Antibacterial Nanocomposite of Poly(Lactic Acid) and ZnO Nanoparticles Stabilized with Poly(Vinyl Alcohol): Thermal and Morphological Characterization.. I. Restrepo, P. Flores and S. Rodríguez-Llamazares.. he effect of polyvinyl alcohol (PVA) as a surface coating agent on the antibacterial and thermal properties of polylactic acid (PLA)/ZnO nanocomposites prepared by melt blending was investigated. The ZnO nanoparticles were coated and stabilized with PVA using a solvothermal method. Nanocomposites were prepared with different ZnO nanoparticle content: 1, 3 and 5 wt.%. Electron transmission microscopy and Fourier transform infrared spectroscopy showed the presence of a layer around the nanoparticles and the interaction between nanoparticles and PVA, respectively. DSC analysis revealed that the thermal properties of the nanocomposites were not affected by the coating of ZnO nanoparticles with PVA. The PLA/ZnO nanocomposites with coated nanoparticles presented better antibacterial activity than those containing uncoated nanoparticles.
https://www.tandfonline.com/doi/full/10.1080/03602559.2018.1466168 |
Polymer-Plastics Technology and Engineering, Latest Articles, pp. 1 - 8, 2018 |
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| 2018 |
Antibacterial activity against Streptococcus mutans and diametrical tensile strength of an interim cement modified with zinc oxide nanoparticles and terpenes: An in vitro study. Verónica Andrade , Alejandra Martínez, Ninón Rojas, Helia Bello-Toledo, Paulo Flores, Gabriela Sánchez-Sanhueza, Alfonso Catalán. Statement of problem
Interim restorations are occasionally left in the mouth for extended periods and are susceptible to bacterial infiltration. Thus, dental interim cements with antibacterial properties are required.
Purpose
The purpose of this in vitro study was to determine in vitro antibacterial activity against Streptococcus mutans and to compare the diametrical tensile strength (DTSs) of dental interim cement modified with zinc oxide nanoparticles (ZnO-NPs) with that of cement modified with terpenes.
Material and methods
Antibacterial properties of ZnO-NPs, terpenes, and dental interim cement modified with ZnO-NPs and cement modified with terpenes against S mutans were tested according to minimum inhibitory concentration (MIC) and direct contact inhibition (DCI). Tensile strength levels were evaluated using DTS. Results were analyzed using the Kolmogorov-Smirnov, ANOVA, and Tamhane tests (α=.05).
Results
The MICs of ZnO-NPs and terpenes against S mutans were 61.94 μg/g and 0.25% v/v, respectively. The DCI assay under the cylinders of cement (area of contact with the agar surface) revealed significant bacterial growth inhibition on Temp-Bond NE specimens with ZnO-NPs at MIC of 495.2 μg/g (8× MIC) and with terpenes at MIC 0.999% v/v (4× MIC) (P<.05). The Temp-Bond NE cement cylinder (control group) showed the lowest DTS (1.05 ±0.27 MPa) of all other test groups. In the Zn-NPs group, the greatest increase occurred in the NP8 (8× MIC; 495.2 μg/g) group with a value of 1.50 ±0.23 MPa, a significant increase in DTS compared with the control and terpene groups (P<.05). In the terpene group, the highest increase corresponded to group T2 (2× MIC; 0.4995% v/v) with a value of 1.29 ±0.18 MPa.
Conclusions
The addition of terpenes and ZnO-NPs to interim cement showed antibacterial activity when in contact with S. mutans ATCC 25175. Both terpenes and ZnO-NPs antimicrobial agents increased diametral tensile strength. |
The Journal of Prosthetic Dentistry 119 (5), pp. 862.e1 - 862.e7, 2018 |
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| 2018 |
The Journal of Prosthetic Dentistry 119 (5), pp. 862.e1 - 862.e7, 2018. Iván Restrepo, Carlos Medina, Viviana Meruane, Ali Akbari-Fakhrabadi, Paulo Flores and Saddys Rodríguez-Llamazares.. The effect of molecular weights and hydrolysis degrees (HD) of polyvinyl alcohol (PVA) on thermal and mechanical properties and crystallinity of polylactic acid (PLA)/PVA blends was investigated. Blends were prepared by the melt blending method using PLA/PVA ratios: 80/20, 90/10 and 97/3 wt. %. A single glass transition temperatures was observed for all PLA/PVA blends, suggesting the formation of binary compatible blends at concentration range studied. Thermogravimetric analysis results showed a better thermal stability for PLA/PVA blends containing PVA of higher Mw and HD. According to mechanical properties, low quantities of PVA (3 wt. %) do not affect the tensile strength of blends (irrespective of Mw and HD). However, as the PVA content increases, tensile strength tends to lower values, especially for blends with 20 wt.% of PVA, with 98% of HD.
Keywords: material testing; melt blending; polylactic acid; polyvinyl alcohol; polymer blend
http://dx.doi.org/10.1590/0104-1428.03117 |
Polímeros 28, pp. 169-177, 2018 |
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| 2018 |
A novel approach to assess the hydrodynamic effects of a salmon farm in a Patagonian channel: Coupling between regional ocean modeling and high resolution les simulation. Julio Herrera, Pablo Cornejo, Héctor Hito Sepulveda, Osvaldo Artal, Renato A. Quiñones.. The interaction between local hydrodynamics conditions and salmon cages are important in disease transmission and in the transport of waste products generated by aquaculture. We propose a modeling methodology to assess the hydrodynamic effects of a salmon farm in a Patagonian channel. The method is based on the coupling between a Coastal and Regional Ocean COmmunity model (CROCO) and a high resolution Large Eddy Simulation (LES) model. A salmon farm located in the Estero Elefantes Channel (45°39′16.50″S73°35′59.40″W) was used as a study case. The physical coherence of the results was validated by comparison with field current velocities measured with an Acoustic Doppler Current Profiler (ADCP). The model predictions were capable of reproducing the tendencies of the variation although there were some differences in magnitude. The results showed that the hydrodynamics of the Estero Elefantes Channel is dominated by two circulation modes depending on the current direction in the adjacent Moraleda channel. Both circulation modes are characterized by a highly unstable shear flow composed by turbulent structures that interact with the salmon cages. Therefore it is not possible to select a local control volume with arbitrarily defined inlets, outlets and impermeable walls to evaluate hydrodynamic processes relevant to the salmon farms. The presence of the cages modifies the natural hydrodynamics of the channel, attenuating the intensity of the local velocity magnitude and generating recirculation and retention zones near them. However, their effect is not confined locally because the perturbations introduced by the presence of cages are propagated far from them. The transport of material discharged inside the cages was also analyzed. This information should prove useful both for producers and the aquaculture management authority.
https://doi.org/10.1016/j.aquaculture.2018.05.003 |
Aquaculture In Press |
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| 2018 |
Co-firing of coal/biomass blends in a pilot plant facility: A comparative study between Opuntia ficus-indica and Pinus radiata.. Rubén Pérez-Jeldres, Mauricio Flores, Pablo Cornejo, Alfredo Gordon, Ximena García. Chile has begun to promote the use of biomass to replace a fraction of the energy produced from coal. However, the power plants are located in the world driest desert, the Atacama Desert, and far from the forest resources. Fortunately, a cactaceous species named Opuntia ficus-indica, has proven to be able to grow under climate desert conditions. In this study the behavior of Opuntia ficus-indica under co-firing conditions with coal, is evaluated and compared to that of Pinus radiata, in terms of heat transfer, ash deposits formation and pollutant emissions in a 150 kW fluidized bed pilot plant. The results revealed a variation of the temperature profile inside the reactor, as well as a relationship between the efficacy factor and the base-acid ratio. The heat transfer coefficients in the dense bed evidenced a decrease in the heat transfers mechanisms attributed to a variation of the mean particle diameter and a greater presence of fuel particles. Under coal-Pine co-firing conditions, an increase in NO formation and a decrease of PM and SO2 concentrations was observed. While co-firing coal with Opuntia showed an increase in the particulate matter and a reduction of NO and SO2 concentrations.
https://doi.org/10.1016/j.energy.2017.10.053 |
Energy Volume 145, 15 February 2018, Pages 1-16 |
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| 2018 |
Transition from spray to roping in hydrocyclones.. D. Pérez, P. Cornejo, C. Rodríguez, F. Concha.. Although roping in hydrocyclones is a problem that has been studied by many researchers, we do not yet have a theory that relates all the variables involved. Several experimental works with different approaches such as mechanical energy balance, work on hydrocyclones with water only and hydrocyclone air core measurements with different instruments in the laboratory and plant have attempted to explain the roping phenomenon. They have addressed design variables such as apex to vortex diameters and different cone angles as well as operating variables such as inlet solid concentration, particle size, pressure and overflow and underflow flow rates and concentrations in order to understand their effect on the roping condition. In this paper we intend to verify some of the conclusions of these studies and establish inlet pressure and particle diameter as the variables that, in combination, lead from spray to roping. We present a computational model using Computational Fluid Dynamics (CFD) to study a 75-mm laboratory hydrocyclone operating at a variable flow rate and with three different particle diameters. The Reynolds Stress Model and Eulerian multiphase model were used to model the turbulence and interaction of phases, respectively. The solid particles are described with the kinetic theory of granular flows (KTGF). Physical coherence and accuracy were compared with experimental data, where errors are within the expected range for an engineering prediction. The results indicate that transition from spray to roping generates an increase in the inlet flow pressure and/or particle diameter at a constant solid concentration in the feed flow. For 20-µm-diameter particles an increase results in a decrease in the discharge angle, although it always has a spray shape, for 34-µm diameters increasing the inlet pressure generates a semi-rope discharge and for 70-µm-diameter particles a small increase in the inlet pressure generates a roping condition. Transition to roping is characterized by a decrease in the air core diameter and discharge angle due to slow rotational velocity when particle diameter increases or higher accumulation of the solid fraction in the apex when inlet pressure increases. The passage from spray to roping occurs with a change in the frequency spectrum of the pressure oscillations in the walls of the hydrocyclone, with high amplitudes at low frequencies for spray discharge and noisy signals in all spectrums and damped low frequencies for roping.
https://doi.org/10.1016/j.mineng.2018.04.008 |
Minerals Engineering Volume 123, July 2018, Pages 7184. |
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| 2018 |
Assessing the energy benefit of using a wind turbine micro-siting model. . Leandro Parada, Carlos Herrera, Paulo Flores, Victor Parada. Wind farm layouts are often designed based on simple rules that give rise to regular arrays. Several studies have stated that these arrays may not be efficient due to high wake losses for some wind directions. Recently, wind turbine micro-siting models have been compared with respect to regularly arrayed layouts. However, these studies have considered just a single regular layout configuration and a fixed number of turbines. In this paper, an approach is proposed to design highly efficient wind farms and is further compared to different configurations of regularly arrayed layouts considering different spacings and number of wind turbines. The proposed approach maximizes the power of a wind farm and efficiently incorporates the use of irregular terrain boundaries and real wind data. The proposed approach is first compared to the Horns Rev I layout. Subsequently, the proposed approach is further compared to different regular layout configurations using wind data measured at a site located in Northern Chile. The results suggest that regularly arrayed wind farms are sub-optimal and may be subjected to high wake losses, particularly for some wind directions. With the proposed approach, 4.09% and 2.18% higher efficiencies on average were obtained compared to aligned and staggered layouts, respectively.
https://doi.org/10.1016/j.renene.2017.11.018 |
Renewable Energy 118 (2018) 591-601. |
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| 2018 |
Effect of an external electric field on capillary filling of water in hydrophilic silica . Nabin Kumar Karna, Andres Rojano Crisson, Enrique Wagemann, Jens H. Walthercd and Harvey A. Zambrano. https://doi.org/10.1039/c8cp03186j |
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| 2017 |
Two methods for modeling vibrations of planetary gearboxes including faults: Comparison and validation. J. Parra, Cristián Molina Vicuña. Mechanical Systems and Signal Processing 92 (2017) 213-225 |
Mechanical Systems and Signal Processing (ISI) |
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| 2017 |
Wind farm layout optimization using a Gaussian-based wake model. Leandro Parada, Carlos Herrera, Paulo Flores, Victor Paradac. Renewable Energy 107 (2017) 531-541 |
Renewable Energy (ISI) |
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| 2017 |
Multiscale characterization of nano-engineered fiber-reinforced composites: Effect of carbon nanotubes on the out-of-plane mechanical behavior. Carlos Medina, Eduardo Fernández, Alexis Salas, Fernando Naya, Jon Molina, Manuel F Meléndrez, and Paulo Flores. Journal of Nanomaterials, 2017 (2017), 1-9 |
Journal of Nanomaterials (ISI) |
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| 2017 |
Feedback on the Surveillance 8 challenge: Vibration-based diagnosis of a Safran aircraft engine. Jérôme Antoni, Julien Griffaton, Hugo André, Luis David Avendaño-Valencia, Frédéric Bonnardot, Oscar Cardona-Morales, German Castellanos-Dominguez, Alessandro Paolo Daga, Quentin Leclère, Cristián Molina Vicuña, David Quezada Acuña, Agusmian Partogi Ompus. Mechanical Systems and Signal Processing 97 (2017) 112-144 |
Mechanical Systems and Signal Processing (ISI) |
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| 2017 |
A method for reduction of Acoustic Emission (AE) data with application in machine failure detection and diagnosis. Cristián Molina Vicuña, Christoph Höweler. Mechanical Systems and Signal Processing 97 (2017) 44-58 |
Mechanical Systems and Signal Processing (ISI) |
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| 2017 |
Application of uncoupled damage models to predict ductile fracture in sheet metal blanking. Cristian Canales, Romain Boman, Jean-Philippe Ponthot. Key Engineering Materials 725 (2017) 483-488 |
Key Engineering Materials (ISI) |
|
| 2017 |
On the numerical simulation of sheet metal blanking process. Cristian Canales, Philippe Bussetta, Jean-Philippe Ponthot. International Journal of Material Forming 10 (2017) 55-71 |
International Journal of Material Forming (ISI) |
|
| 2017 |
Feedback on the Surveillance 8 challenge: Vibration-based diagnosis of a Safran aircraft engine. J. Antoni, J. Griffaton, H. André, L. Avendaño-Valencia, F. Bonnardot, O. Cardona-Morales, G. Castellanos-Dominguez, A. Daga, Q. Leclère, C. Molina, D. Quezada, A. Partogi.. This paper presents the content and outcomes of the Safran contest organized during the International Conference Surveillance 8, October 2021, 2015, at the Roanne Institute of Technology, France. The contest dealt with the diagnosis of a civil aircraft engine based on vibration data measured in a transient operating mode and provided by Safran. Based on two independent exercises, the contest offered the possibility to benchmark current diagnostic methods on real data supplemented with several challenges. Outcomes of seven competing teams are reported and discussed. The object of the paper is twofold. It first aims at giving a picture of the current state-of-the-art in vibration-based diagnosis of rolling-element bearings in nonstationary operating conditions. Second, it aims at providing the scientific community with a benchmark and some baseline solutions. In this respect, the data used in the contest are made available as supplementary material.
https://doi.org/10.1016/j.ymssp.2017.01.037 |
Mechanical Systems and Signal Processing 97 (2017) 112-144. |
|
| 2017 |
Application of uncoupled damage models to predict ductile fracture in sheet metal blanking.. C. Canales, R. Boman, J.-P. Ponthot. The use of uncoupled damage models has been widely used over the years for the prediction of ductile fracture in engineering applications. Nevertheless, its applicability in the prediction of failure has been shown to be limited in the wide range of loading conditions encountered in different manufacturing processes. In order to enhance the formulation of former damage models, the Lode angle has been recently used to characterize the stress states along with the stress triaxiality. This new family of damage models has been demonstrated to give excellent results when proportional loading paths are considered, but its efficiency in more complex applications still need further analysis. To this end, a comparative study of former and recently developed uncoupled damage models is performed in this work. The identification of material parameters is done considering simple mechanical tests under different conditions. Then, the models are used to predict the onset and propagation of cracks during blanking, where numerical predictions are compared with experimental results. Finally, the selected damage models presented a remarkable overall performance in the range of clearances under study.
https://doi.org/10.4028/www.scientific.net/KEM.725.483 |
Key Engineering Materials 725 (2017) 483-488. |
|
| 2017 |
On the numerical simulation of sheet metal blanking process. C. Canales, P. Bussetta, J.-P. Ponthot. The use of the blanking process has been widely spread in mass production industries. In this technique, the quality of the final product is directly related to the setting parameters of the process and the material response of the sheet. In the present work, a general framework based on the finite element method for the simulation of the sheet metal blanking process is presented. The proposed approach properly addresses all the numerical challenges related to blanking. First, an extension of elasto-viscoplastic constitutive equations for the large strain regime is used to take into account the material strain-rate sensitivity. Then, the inertial effects coming from high velocity operations are considered by means of an implicit time integration scheme. Moreover, the frictional contact interactions are simulated with the classical Coulomb law and an energetically consistent formulation of area regularization. Finally, ductile fracture is modeled thanks to the element deletion method coupled with a fracture criterion. The blanking process is then simulated for different setting parameters. The accuracy of this approach is evaluated by comparing the numerical predictions to experimental results for both quasi-static and dynamic conditions. Good agreement is found between experimental and numerical results for all cases. |
International Journal of Material Forming 10 (2017) 55-71. |
|
| 2017 |
Estimation of the surface interaction mechanism of ZnO nanoparticles modified with organosilane groups by Raman Spectroscopy.. A. Jaramillo, R. Baez-Cruza, L. Montoya, C. Medina, E. Pérez-Tijerina, F. Salazar, D. Rojas, M. Melendrez. https://doi.org/10.1016/j.ceramint.2017.06.027 |
Ceramics international 43 (2017) 11838-11847. |
|
| 2017 |
Synthesis of Copper Nanowires and Their Antimicrobial Activity on Strains Isolated Persistent Endodontic Infections.. G. Sánchez-Sanhueza, S. Rebolledo, J. López, M. Encalada, H. Bello-Toledo, D. Rojas, C. Medina, M. F. Melendrez.. . |
Journal of Nanoscience and Nanotechnology, IN PRESS. |
|
| 2017 |
Fluid dynamic study of mixtures of sugarcane bagasse and sand particles: Minimum fluidization velocity. . Pérez, Nestor Proenza; Pedroso, Daniel Travieso ; Machin, Einara Blanco ; Antunes, Julio Santana; Verdú Ramos, Ricardo Alan and Silveira, Jose Luz.. https://doi.org/10.1016/j.biombioe.2017.08.015 |
Biomass & Bioenergy 107, pp. 135-149, 2017 |
|
| 2017 |
Technical assessment of the Biomass Integrated Gasification/Gas Turbine Combined Cycle (BIG/GTCC) incorporation in the sugarcane industry. . Daniel Travieso Pedroso, Einara Blanco Machin, Nestor Proenza Pérez, Lúcia Bollini Braga and José Luz Silveira.. https://doi.org/10.1016/j.renene.2017.07.038 |
Renewable Energy 114, Part B, pp. 464-479, 2017 |
|
| 2017 |
Technical assessment of discarded tires gasification as alternative technology for electricity generation. . Machin, Einara Blanco; Pedroso, Daniel Travieso; and de Carvalho, João Andrade.. https://doi.org/10.1016/j.wasman.2017.07.004 |
Waste Management 68, pp. 412-420, 2017 |
|
| 2017 |
Technical assessment of discarded tires gasification as alternative technology for electricity generation. . Machin, Einara Blanco; Pedroso, Daniel Travieso; and de Carvalho, João Andrade.. https://doi.org/10.1016/j.wasman.2017.07.004 |
Waste Management 68, pp. 412-420, 2017 |
|
| 2017 |
Energetic valorization of waste tires.. Einara Blanco Machin, Daniel Travieso Pedroso and João Andradede Carvalho Jr.. https://doi.org/10.1016/j.rser.2016.09.110 |
Renewable & Sustainable Energy Reviews 68, pp. 306-315, 2017 |
|
| 2017 |
Slip divergence of water flow in graphene nanochannels: The role of chirality . Enrique Wagemann, Elton Oyarzua, Jens H. Walther and Harvey A. Zambrano. Graphene has attracted considerable attention due to its characteristics as a 2D material and its fascinating properties, providing a potential building block for nanofabrication. In nanochannels the solidliquid interface plays a non-negligible role in determining the fluid dynamics. Therefore, for an optimal design of nanofluidic devices, a comprehensive understanding of the slippage in a water flow confined between graphene walls is important. In nanoconfinement, experimental and computational studies have found the slip length to increase nonlinearly when the shear rate is larger than a critical value. Here, by conducting molecular dynamics simulations, we study the influence of the graphene crystallographic orientation on the slip boundary conditions inside a nanoslit channel. The flow in channels with heights of 2.0, 2.4 and 2.8 nm is driven parallel to the zig-zag and arm-chair crystallographic directions. We extract flow rates, velocity profiles, slip velocities and slip lengths. The slip velocity displays a linear relationship to the shear stress up to a critical value, which is not size dependent. Moreover, the slip length is found to be shear stress dependent above a critical shear stress value of 0.4 MPa. Furthermore, our results indicate that after this critical shear stress is reached, the flow rates are significantly influenced (up to 10%) by the particular orientation of the graphene topology.
https://doi.org/10.1039/C6CP07755B |
Physical Chemistry Chemical Physics |
|
| 2016 |
A new synthesis route of ZnO nanonails via microwave plasma-assisted chemical vapor deposition. M.F. Meléndreza, F.Solis-Pomar, C.D.Gutierrez-Lazos, P.Flores, A.F.Jaramillo, A.Fundora, E. Pérez-Tijerina. Ceramics International, 2016 |
Ceramics International (ISI) |
|
| 2016 |
Evaluation of the fill yarns effect on the out-of-plane compressive fatigue behavior for an unidirectional glass fiber reinforced epoxy composite. Víctor San Juan, Eduardo Fernández, Gonzalo Pincheira, Manuel Meléndrez, Paulo Flores. Composite Structures, Volume 138, 2016, pp. 237-242 |
Composite Structures (ISI) |
|
| 2016 |
New aspects concerning the generation of acoustic emissions in spur gears, the influence of operating conditions and gear defects in planetary gearboxes. Álvaro Barrueto Novoa and Cristián Molina Vicuña. Insight, Vol 58, No 1, January 2016. DOI: 10.1784/insi.2016.58.1.18 |
Insight (ISI) |
|
| 2016 |
Effect of ZnO nanoparticles obtained by arc discharge on thermo-mechanical properties of matrix thermoset nanocomposites. C. Medina M, D. Rojas, P. Flores, E. Perez-Tijerina, M. F. Melendrez. Journal of Applied Polymer Science, 2016 |
Journal of Applied Polymer Science (ISI) |
|
| 2016 |
Respuesta de un harnero vibratorio ante la perdida de rigidez en los apoyos. Manuel Moncada, Cristian G. Rodríguez. Ingeniare. Revista Chilena de Ingeniería. Vol. 24 N° Especial 2016, pp. 25-31 |
Ingeniare. Revista chilena de ingeniería (Scielo) |
|
| 2016 |
Non-Linear Model of Vibrating Screen to Determine Permissible Spring Deterioration for Proper Separation. Cristian Rodriguez, Manuel Moncada, Emilio Dufeu, and Mario Razeto. Shock and Vibration, In Press |
Shock and Vibration (ISI) |
|
| 2016 |
Caracterizacion experimental y modelacion de una bomba de calor reversible para un vehiculo electrico. Cristian Cuevas, Vincent Lemort. Ingeniare. Revista Chilena de Ingenieria. Vol. 24 N° Especial 2016, pp. 40-48 |
Ingeniare. Revista Chilena de Ingenieria (Scielo). |
|
| 2016 |
Evaluation of the vibration performance response of insulating floor panels under human walking conditions. Alexander Opazo, Peter Dechent, Patricio Cendoya, Cristian Molina. Revista de la Construcción. Journal of Contruction, Vol 15, No 2, pp. 19-27, 2016 |
Revista de la Construcción. Journal of Contruction (ISI) |
|
| 2016 |
Potential of distributed photovoltaics in urban Chile. Pablo Campos, Lorena Troncoso, Peter D. Lund, Cristian Cuevas, Adelqui Fissore, Rodrigo García. Solar Energy 135 (2016) 43-49 |
Solar Energy (ISI) |
|
| 2016 |
A numerical study of hypoelastic and hyperelastic large strain viscoplastic Perzyna type models. Claudio Careglio, Cristian Canales, Carlos García Garino, Anibal Mirasso, Jean-Philippe Ponthot. Acta Mechanica 227 (2016) 3177-3190 |
Acta Mechanica (ISI) |
|
| 2015 |
Condition monitoring of Pump-turbines. New challenges. Eduard Egusquiza, Carme Valero, Alex Presas, David Valentin, Cristian Rodriguez. Journal of the International Measurement Confederation, Volume 67, May 2015, pp. 151-163 |
Journal of the International Measurement Confederation (ISI) |
|
| 2015 |
Evaluating the longitudinal stability of an UAV using a CFD-6DOF model. M. Pablo Sandoval, O. Pablo Cornejo, D. Frank Tinapp. Aerospace Science and Technology, en prensa |
Aerospace Science and Technology (ISI) |
|
| 2015 |
Damage Assessment of Rolling Element Bearing Using Cyclostationary Processing of AE Signals with Electromagnetic Interference. David Quezada Acuña, Cristián Molina Vicuña. In Book: Cyclostationarity: Theory and Methods II (ISBN: 978-3-319-16329-1), Springer. |
In Book: Cyclostationarity: Theory and Methods II |
|
| 2015 |
Comparison of push-in and push-out tests for measuring interfacial shear strength in nano-reinforced composite materials. Carlos Medina , Jon M Molina-Aldareguía, Carlos González, Manuel F Meléndrez, Paulo Flores, Javier LLorca. Journal of Composites Materials, 2015, in press |
Journal of Composites Materials (ISI) |
|
| 2015 |
Phase Transformations and Crack Initiation in a High-Chromium Cast Steel Under Hot Compression Tests. Ingrid Neira Torres, Paulo Flores, Anne Marie Habraken, Jacqueline Lecomte-Beckers. Journal of Materials Engineering and Performance, Volume 24 (5), 2015, pp. 2025-2041 |
Journal of Materials Engineering and Performance (ISI) |
|
| 2015 |
Quality and high yield synthesis of Ag nanowires by microwave-assisted hydrothermal method. Manuel Meléndrez, Carlos Medina, Francisco Solis-Pomar, Paulo Flores, Mani Paulraj, Eduardo Pérez-Tijerina. Nanoscale Research Letters, 2015, pp. 10-48 |
Nanoscale Research Letters (ISI) |
|
| 2015 |
Influence of aramid fibers on the mechanical behavior of a hybrid carbon-aramid-reinforced epoxy composite. Gonzalo Pincheira, Cristian Canales, Carlos Medina, Eduardo Fernandez, Paulo Flores. Journal of Materials: Design and Applications, 2015 |
Journal of Materials: Design and Applications (ISI) |
|
| 2015 |
FE modeling of the cooling and tempering steps of bimetallic rolling mill rolls. Ingrid Neira Torres, Gaëtan Gilles, Jérôme Tchoufang Tchuindjang, Paulo Flores, Jacqueline Lecomte-Beckers, Anne Marie Habraken. International Journal of Material Forming, 2015 |
International Journal of Material Forming (ISI) |
|
| 2015 |
Wall embedded electrodes to modify electroosmotic flow in silica nanoslits . Harvey A. Zambrano, Nicolás Vásquez and Enrique Wagemann. Electroosmotic flow in a silica slit channel with nonuniform surface charge density is investigated. In nanoconfinement, the electrical double layer occupies a non-negligible fraction of the system. Therefore, modifying the charge density on specific locations on the channel wall surface allows effective manipulation of the electroosmotic flow rates. In the present study, extensive (160 ns) nonequilibrium molecular dynamics simulations are conducted to investigate the ability of controlling the electroosmotic flow control in a nanoslit by patterning the surface potential. The mechanism to modify the surface charge consists of a set of charged electrodes embedded within one of the channel walls. The presence of the embedded electrodes results in the redistribution of ions in the electrolyte solution and in the alteration of the electroosmotic flow throughout the nanochannel. Indeed, the results reveal significant changes in the electroosmotic driving force and velocity profiles including local flow reversal. This study provides physical insight into the direct manipulation of the electrokinetic flow in nanoslits.
https://doi.org/10.1039/C5CP05785J |
Physical Chemistry Chemical Physics |
|
| 2014 |
Monitoring of rotor-stator interaction in pump-turbine using vibrations measured with on-board sensors rotating with shaft. C.G. Rodriguez, B. Mateos-Prieto, E. Egusquiza. Shock and Vibration 24 (2014), 1-8, Article ID 276796 |
Shock and Vibration (ISI) |
|
| 2014 |
Effects of operating conditions on the Acoustic Emissions (AE) from planetary gearboxes. Cristián Molina Vicuña. Applied Acoustics 77 (2014) 150 -- 158 |
Applied Acoustics (ISI) |
|
| 2014 |
Características vibratorias de transmisiones planetarias de una etapa. Cristián Molina Vicuña. Ingeniare. Revista chilena de ingeniería, vol. 22 Nº 1, 2014, pp. 88-98 |
Ingeniare. Revista chilena de ingeniería (Scielo) |
|
| 2014 |
Numerical Studies on the Hydrodynamic Effect of a Salmon Farm in an Idealized Environment. Pablo Cornejo, Héctor Hito Sepúlveda, Marcelo H Gutiérrez, Gonzalo Olivares. Aquaculture 430, 195-206, 2014 |
Aquaculture (ISI) |
|
| 2014 |
Dynamic and phenomenological vibration models for failure prediction on planet gears of planetary gearboxes. Juan Pablo Torregrosa Koch, Cristián Molina Vicuña. J Braz. Soc. Mech. Sci. Eng. (2014) 36:533-545 |
J Braz. Soc. Mech. Sci. Eng. (ISI) |
|
| 2014 |
Cyclostationary Processing of Vibration and Acoustic Emissions for Machine Failure Diagnosis. Cristián Molina Vicuña, David Quezada Acuña. In Book: Cyclostationarity: Theory and Methods (ISBN: 978-3-319-04186-5), Springer. |
In Book: Cyclostationarity: Theory and Methods |
|
| 2014 |
The influence of carbon fabric weave on the in-plane shear mechanical performance of epoxy fiber-reinforced laminates. Carlos Medina, Cristian Canales, Carolina Arango, Paulo Flores. Journal of Composites Materials, Volume 48 (23), 2014, pp. 2871-2878 |
Journal of Composites Materials (ISI) |
|
| 2013 |
Modelo dinámico de la zona de contacto en prensas de máquinas papeleras. Pedro Saavedra González, Francisco Saavedra Padilla. Revista de Información Tecnológica, vol 24 Nº4, pp. 75-84 |
Revista de Información Tecnológica (Scielo) |
|
| 2013 |
Diagnóstico de la condición de las barras de motores de inducción. Pedro Saavedra González, Christian Talbot. Revista de Información Tecnológica, vol 24 Nº4, pp. 85-94 |
Revista de Información Tecnológica (Scielo) |
|
| 2013 |
The effect of multiwall carbon nanotubes on the in-plane shear behavior of epoxy glass fiber reinforced composites. Carolina Fernández, Carlos Medina, Gonzalo Pincheira, Cristian Canales, Paulo Flores. Composites: PartB, Volume 55, 2013, pp. 421-425 |
Composites (ISI) |
|
| 2012 |
Failure investigation of a large pump-turbine runner. E. Egusquiza, C Valero, X. Huang, E. Jou, A. Guardo, C. Rodriguez. Engineering Failure Analysis 23, 27-34 |
Engineering Failure Analysis (ISI) |
|
| 2012 |
Capability of structural-acoustical FSI numerical model to predict natural frequencies of submerged structures with nearby rigid surfaces. C.G. Rodriguez; P. Flores; F.G. Pierart; L.R. Contzen; E. Egusquiza. Computers & Fluids, 35, 117-126 |
Computers & Fluids (ISI) |
|
| 2012 |
Theoretical frequency analysis of vibrations from planetary gearboxes. Cristián Molina Vicuña. Forschung im Ingenieurwesen: Volume 76, Issue 1 (2012), Page 15-31 |
Forschung im Ingenieurwesen (ISI) |
|
| 2012 |
Study of the geometrical inaccuracy on a SPIF two-slope pyramid by finite element simulations. Carlos Guzmán, Jun Gu, Joost Duflou, Hans Vanhove, Paulo Flores, Anne Marie Habraken. International Journal of Solids and Structures, Volume 49 (25), 2012, pp. 3594-3604 |
International Journal of Solids and Structures (ISI) |
|
| 2012 |
Testing and modeling. International Journal of Refrigeration. Cuevas C., Fonseca N., Lemort V.. International Journal of Refrigeration, Volume 35, Issue 4, June 2012, pp. 841-849 |
International Journal of Refrigeration (ISI) |
|
| 2012 |
Automotive electric scroll compressor: Testing and modeling. C. Cuevas, N. Fonseca, V. Lemort. International Journal of Refrigeration 35 (2012) 841-849 |
International Journal of Refrigeration (ISI) |
|
| 2011 |
Thermo-hydraulic characterization of a louvered fin and flat tube heat exchanger. Cristian Cuevas, Danielle Makaire, Laurent Dardenne, Philippe Ngendakumana. Experimental Thermal and Fluid Science 35 (2011) pp. 154-164 |
Experimental Thermal and Fluid Science (ISI) |
|
| 2011 |
Experimental study of the energy and thermal comfort performance of chilled ceiling panels. Néstor Fonseca Diaz and Cristian Cuevas. HVAC&R Research, 17(3):337-393, 2011 |
HVAC&R Research (ISI) |
|
| 2011 |
Thermo-hydraulic characterization of an automotive intercooler for a low pressure EGR application. Cristian Cuevas, Danielle Makaire, Philippe Ngendakumana. Applied Thermal Engineering 31 (2011) pp. 2474-2484 |
Applied Thermal Engineering (ISI) |
|
| 2011 |
Mathematical Modeling of Coal Gasification in a Fluidized Bed Reactor Using Eulerian Granular Description. Pablo Cornejo, Oscar Farías. International Journal of Chemical Reactor Engineering, vol. 11, 2011, Article A2 |
International Journal of Chemical Reactor Engineering (ISI) |
|
| 2010 |
Characterization of a scroll compressor under extended operating conditions. Cristian Cuevas, Jean Lebrun, Vincent Lemort, Eric Winandy. Applied Thermal Engineering 30 (2010) pp. 605-615 |
Applied Thermal Engineering (ISI) |
|
| 2010 |
Radiant ceiling systems coupled to its enviroment part 1: Experimental analysis. Néstor Fonseca, Cristian Cuevas, Vincent Lemort. Applied Thermal Engineering 30 (2010) pp. 2187-2195 |
Applied Thermal Engineering (ISI) |
|
| 2010 |
Radiant ceiling systems coupled to its enviroment part 2: Dynamic modeling and validation. Néstor Fonseca, Stephane Bertagnolio, Cristian Cuevas. Applied Thermal Engineering 30 (2010) pp. 2196-2203 |
Applied Thermal Engineering (ISI) |
|
| 2010 |
Testing and thermal modeling of radiant panels systems as comissioning tool. Néstor Fonseca Díaz, Cristian Cuevas. Energy Conversion and Management 51 (2010) pp. 2663-2677 |
Energy Conversion and Management (ISI) |
|
| 2010 |
Natural convection at an indoor glazing surface with different window blinds. Cristian Cuevas, Adelqui Fissore, Nestor Fonseca. Energy and Buildings 42 (2010) pp. 1685-1691 |
Energy and Buildings (ISI) |
|
| 2010 |
Experimental and theoretical study of adiabatic humidification in HVAC&R applications. Néstor Fonseca, Cristian Cuevas. Ingeniare. Revista chilena de ingeniería, vol. 18 Nº2, 2010, pp. 243-252 |
Ingeniare. Revista chilena de ingeniería (Scielo) |
|
| 2010 |
Accurate stress computation in plane strain tensile tests for sheet metal using experimental data. Paulo Flores, Víctor Tuninetti, Gaëtan Gilles, Pierre Gonry, Laurent Duchêne, Anne Marie Habraken. Journal of Materials Processing Technology 210 (2010) pp. 1772-1779 |
Journal of Materials Processing Technology (ISI) |
|
| 2009 |
Testing and Modeling a Scroll Expander Integrated into an Organic Rankine Cycle. Lemort, V., Quoilin, S. Cuevas, C. y J. Lebrun. Applied Thermal Engineering 29, 3094-3102 |
Applied Thermal Engineering (ISI) |
|
| 2009 |
Development and Validation of a Condenser Three Zones Model. Cuevas, C., Lebrun, J., Lemort, V. y P. Ngendakumana. Applied Thermal Engineering 29, 3542-3551 |
Applied Thermal Engineering (ISI) |
|
| 2009 |
Testing and Modelling of a Variable Speed Scroll Compressor. Cuevas, C. y J. Lebrun. Applied Thermal Engineering 29, 469-478 |
Applied Thermal Engineering (ISI) |
|
| 2008 |
Development of Simple Cooling Coil Models for Simulation of HVAC Systems. Lemort, V., Lebrun, J., Cuevas, C. e I.V. Teodorese. ASHRAE Transactions 114(1), 219-328 |
ASHRAE Transactions |
|
| 2008 |
Testing and Modeling of an Automotive Wobble Plate Compressor. Cuevas, C., Winandy, E. y J. Lebrun. International Journal of Refrigeration 31(3), 423-431 |
International Journal of Refrigeration (ISI) |
|
| 2008 |
Rotation of axes for anisotropic metal in FEM simulations. L. Duchene, T. Lelotte, P. Flores, S. Bouvier, A.-M. Habraken. International Journal of Plasticity, 2008 |
International Journal of Plasticity (ISI) |
|
| 2007 |
Theoretical and Experimental Study of the Natural Draft in Chimneys of Buildings for Domestic Gas Appliances. Farías O. Jara F. and Betancourt R.. Energy & Buildings (2007) |
Energy & Buildings (ISI) |
|
| 2007 |
Thermal Simulation of an Attached Sunspace and its Experimental Validation. Mottard, J.-M. y A. Fissore. Solar Energy 81, 305-315 |
Solar Energy (ISI) |
|
| 2007 |
Numerical Simulation of Fluid Added Mass Effect on a Francis Turbine Runner. Liang, Q.W., Rodríguez, C.G., Egusquiza, E., Escaler, X., Farhat, M. y F. Avellan. Computers & Fluids 36, 1106-1118 |
Computers & Fluids (ISI) |
|
| 2007 |
Model Identification and FE Simulations: Effect of Different Yield Loci and Hardening Laws in Sheet Forming. Flores, P., Duchene, L., Bouffioux, C., Lelotte, T., Henrard, C., Pernin, N., Van Bael, A., He, S., Duflou, J. y A.M. Habraken. International Journal of Plasticity 23, 420-449 |
International Journal of Plasticity (ISI) |
|
| 2007 |
Plane Strain Test for Metal Sheet Characterization. Flores, P., Bonnet, F. y A.-M. Habraken. Key Engineering Materials 344, 135-142 |
Key Engineering Materials (ISI) |
|
| 2007 |
Measurement Results and Experimental Analysis Study of the Thermal Balance of a Window. Fissore, A. y N. Fonseca. Building and Environment 42, 3570-3581 |
Building and Environment (ISI) |
|
| 2007 |
Experimental Study of the Thermal Balance of a Window, Design Description. Fissore, A. y N. Fonseca. Building and Environment 42, 3309-3321 |
Building and Environment (ISI) |
|
| 2007 |
Frequencies in the Vibration Induced by the Rotor Stator Interaction in a Centrifugal Pump-Turbine. C. G. Rodriguez, E. Egusquiza, I. F. Santos. ASME Journal of Fluids Engineering 129, 1428-1435 |
ASME Journal of Fluids Engineering (ISI) |
|
| 2007 |
Online monitoring system for mining shovels focused on vibration analysis. P.N. Saavedra and C.J. Molina Vicuña. CIM Bulletin, Vol. 100, No. 1101 (2007) 1--9 |
CIM Bulletin (ISI) |
|
| 2006 |
Robust Parameter Identification Using Forced Responses. Pascual, R., Schälchli, R. y M. Razeto. Mechanical Systems and Signal Processing 21, 1008-1025 |
Mechanical Systems and Signal Processing (ISI) |
|
| 2006 |
Experimental Investigation of Added Mass Effects on a Francis Turbine Runner in Still Water. C. G. Rodriguez, E. Egusquiza, X. Escaler, Q. W. Liang y F. Avellan. Journal of Fluids and Structures 22, 699-712 |
Journal of Fluids and Structures (ISI) |
|
| 2006 |
Accurate assesment of computed order tracking. P.N. Saavedra, C.G. Rodriguez. Shock and Vibration, 13, 13-32 |
Shock and Vibration (ISI) |
|
| 2005 |
A Simple Method of Estimating the Maintenance Cost of Airframes. Salamanca, H.E. y L.L. Quiroz. Aircraft Engineering and Aerospace Technology 77(2), 148-151 |
Aircraft Engineering and Aerospace Technology (ISI) |
|
| 2005 |
Superposition of Flight Loads for a Probabilistic Damage Tolerance Design for an Acrobatic Aircraft. Salamanca, H.E. y L.L. Quiroz. Aircraft Engineering and Aerospace Technology 77(6), 478-485 |
Aircraft Engineering and Aerospace Technology (ISI) |
|
| 2005 |
New Revolution-Order Transform for Analysing Non-Stationary Vibrations. Saavedra, P.N. y J.A. González. Insight 47(1), 29-35 |
Insight (ISI) |
|
| 2005 |
Improvement of Damage-Assessment Results Using High-Spatial Density Measurements. Pascual, R., Schälchli, R. y M. Razeto. Mechanical Systems and Signal Processing 19, 123-138 |
Mechanical Systems and Signal Processing (ISI) |
|
| 2005 |
Development of an Experimental Equipment for the Identification of Constitutive Laws. Flores, P.A.. Applied Mechanics and Materials 3-4, 91-97 |
Applied Mechanics and Materials (ISI) |
|
| 2005 |
Development of an Experimental Equipment for the Identification of Constitutive Laws. Flores, P., Rondia, E. y A.-M. Habraken. International Journal of Forming Processes, 117-137 |
International Journal of Forming Processes (ISI) |
|
| 2004 |
Vibration Analysis of Rotors for the Identification of Shaft Misalignment. Part 2: Experimental Validation. Saavedra, P.N. y D.E. Ramírez. Journal of Mechanical Engineering Science 218 Part C, 987-999 |
Journal of Mechanical Engineering Science (ISI) |
|
| 2004 |
Vibration Analysis of Rotors for the Identification of Shaft Misalignment. Part 1: Theoretical Analysis. Saavedra, P.N. y D.E. Ramírez. Journal of Mechanical Engineering Science 218 Part C, 971-985 |
Journal of Mechanical Engineering Science (ISI) |
|
| 2004 |
Natural Convection at an Indoor Glazing Surface. Cuevas, C. y A. Fissore. Building and Environment 39, 1049-1053 |
Building and Environment (ISI) |
|
| 2003 |
Real-time monitoring and characterization of flames by principal component analysis,. Sbarbaro D., Farías O. and Zawadsky A.. Combustion and Flame 132 (3), 591 - 595 |
Combustion and Flame (ISI) |
|
| 2003 |
Analysis of the Oil Return in a Pair of Scroll Compressors Working in Parallel at Part Load. Winandy, E.L. y C. Cuevas. Applied Thermal Engineering 23, 623-636 |
Applied Thermal Engineering (ISI) |
|
| 2003 |
New Approach for performance testing of air-cooled condensing units. Cuevas, C. y E. Winandy. Experimental Thermal and Fluid Science 2003; 27(7): 781-787 |
Experimental Thermal and Fluid Science (ISI) |
|
| 2003 |
Simulation of Impact Between Rigid Elements. Barrientos, G. y L. Baeza. International Journal of Solids and Structures 40, 4943-4954 |
International Journal of Solids and Structures (ISI) |
|
| 2002 |
Vibration Analysis of Rotor for Crack Identification.. Saavedra P., Cuitiño L.. Journal of vibration and control, Volume 7, 2002. |
Journal of Vibration and Control (ISI) |
|
| 2002 |
Vibration Analysis Applied to Low Speed Machines in Pulp and Paper Industries.. Saavedra P., Estupiñán E.. Tappi Journal, January 2002, Vol 85, Nº1. |
Tappi Journal (ISI) |
|
| 2002 |
Vibration Analysis of Rotor for Crack Identification . Saavedra P., Cuitiño L.. Journal of Vibration and Control, Volume 7, 2002. |
Journal of Vibration and Control (ISI) |
|
| 2002 |
Simplified Modelling of an Open-Type Reciprocating Compressor. Winandy, E., Saavedra, C. y J. Lebrun. International Journal of Thermal Sciences, Volume 41, Issue 2, February 2002, Pages 183-192 |
International Journal of Thermal Sciences (ISI) |
|
| 2002 |
Experimental analysis and Simplified Modelling of a Hermetic Scroll Refrigeration Compressor. Winandy, E., Saavedra, C. y J. Lebrun. Applied Thermal Engineering, Volume 22, Issue 2, February 2002, Pages 107-120 |
Applied Thermal Engineering (ISI) |
|
| 2002 |
Vibration Analysis of Mining Shovels. P.N. Saavedra, E.A. Salamanca. Canadian Institute of Mining, Meallurgy and Petroleum CIM Bulletin, 95, 1-66 |
Canadian Institute of Mining Journal (ISI) |
|
| 2002 |
Integrated approach to induction motor fault diagnosis. Saavedra p., Estupiñán E.. Integrated approach to induction motor fault diagnosis |
Vibration Vol. 18, p-p. 4-8 |
|
| 2001 |
Condition monitoring of variable-speed and load machinery using time-frequency distributions. Saavedra P. , Araya F.. INSIGHT Vol. 43, Nº8, August 2001, pp. 526-530. |
Insight (ISI) |
|
| 2001 |
Crack detection and vibration behavior of cracked beams. Saavedra P., Cuitiño L.. Computers and Structures, Volume 74 Nº16, june 2001, pp. 1451-1459. |
Computers & Structures (ISI) |
|
| 2001 |
Crack detection and vibration behavior of cracked beams. Saavedra P., Cuitiño L.. Computers and Structures, Volume 74 Nº16, june 2001, pp. 1451-1459 |
Computers and Structures (ISI) |
|
| 2001 |
Condition monitoring of variable-speed and load machinery using time-frequency distributions. Saavedra P. , Araya F.. INSIGHT Vol. 43, Nº8, August 2001, pp. 526-530 |
Insight (ISI) |
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