Дисертації з теми "Cell cycling performance simulation"
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Cadavid, Cadavid Juan Manuel. "Discrete-Event Simulation: Development of a simulation project for Cell 14 at Volvo CE Components." Thesis, Mälardalen University, School of Innovation, Design and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-6162.
Повний текст джерелаIn line with the company-wide CS09 project being carried out at Volvo CE Components, Cell 14 will have changes in terms of distribution of machines and parts routing to meet the lean manufacturing goals established. These changes are of course dependant on future production volumes, as well as lot sizing and material handling considerations.
In this context, an important emphasis is given to the awareness of the performance measures that support decision making in these production development projects. By using simulation as a confirmation tool, it is possible to re-assess these measures by testing the impact of changes in complex situations, in line with the lean manufacturing principles.
The aim of the project is to develop a discrete event simulation model following the methodology proposed by Banks et al (1999). A model of Cell 14 will be built using the software Technomatix Plant Simulation ® which is used by the Company and the results from the simulation study will be analyzed.
Bayer, Daniel Nicholas. "The Magnetocaloric Effect & Performance of Magnetocaloric Materials in a 1D Active Magnetic Regenerator Simulation." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1578587695272946.
Повний текст джерелаZemzemi, Imene. "High-performance computing and numerical simulation for laser wakefield acceleration with realistic laser profiles." Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX111.
Повний текст джерелаThe advent of ultra-short high-intensity lasers has paved the way to new and promising, yet challenging, areas of research in laser-plasma interaction physics. The success of building petawatt femtosecond lasers offers a promising path for designing future particle accelerators and light sources.Achieving this goal intrinsically relies on the combination of experiments and numerical modeling. So far, Particle-In-Cell (PIC) codes have been the ultimate tool to accurately describe the laser-plasma interaction especially in the field of Laser WakeField Acceleration (LWFA). Nevertheless, the numerical modeling of laser-plasma accelerators in 3D can be a very challenging task due to their high computational cost.A useful approach to speed up such simulations consists of employing reduced numerical modes which simplify the problem while retaining a high fidelity.Among these models, Fourier field decomposition in azimuthal modes for the cylindrical geometry is particularly well suited for physical problems with close to cylindrical symmetry, which is the case in LWFA.During my Ph.D., I first implemented this method in the open-source code SMILEI in the Finite Difference Time Domain (FDTD) discretization scheme for the Maxwell solver. However, this kind of solvers may suffer from numerical Cherenkov radiation (NCR). To mitigate this artifact, I also implemented Maxwell’s solver in the Pseudo Spectral Analytical Domain (PSATD) scheme which offers better accuracy of the results.This method is then employed to study the impact of realistic laser profiles from the Apollon facility on the quality of the accelerated electron beam. Its ability to correctly model the involved physical processes is investigated by determining the optimal number of modes and benchmarking its results with full 3D Cartesian simulations. It is shown that the imperfections in the laser pulse lead to differences in the results compared to theoretical profiles. They degrade the performance of laser-plasma accelerators especially in terms of the quantity of injected charge. These simulations, insightful for the future experiments of LWFA that will be held soon with the Apollon laser, put forward the importance of including realistic lasers in the simulation to obtain reliable results
Oheda, Hakim. "Artificial neural network control strategies for fuel cell hybrid system." Thesis, Cranfield University, 2013. http://dspace.lib.cranfield.ac.uk/handle/1826/7964.
Повний текст джерелаLi, Chu Tu. "Development of Field Scenario Ray Tracing Software for the Analysis of Bifacial Photovoltaic Solar Panel Performance." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35523.
Повний текст джерелаNikfarjam, Farhad. "Extension de la méthode LS-STAG de type frontière immergée/cut-cell aux géométries 3D extrudées : applications aux écoulements newtoniens et non newtoniens." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0023/document.
Повний текст джерелаThe LS-STAG method is an immersed boundary/cut-cell method for viscous incompressible flows based on the staggered MAC arrangement for Cartesian grids where the irregular boundary is sharply represented by its level-set function. This approach results in a significant gain in computer resources compared to commercial body-fitted CFD codes. The 2D version of LS-STAG method is now well-established and this manuscript presents its extension to 3D geometries with translational symmetry in the z direction (3D extruded configurations). This intermediate step will be regarded as the milestone for the full 3D solver, since both discretization and implementation issues on distributed memory machines are tackled at this stage of development. The LS-STAG method is then applied to Newtonian and non-Newtonian flows in 3D extruded geometries (axisymmetric pipe, circular cylinder, duct with an abrupt expansion, etc.) for which benchmark results and experimental data are available. The purpose of these investigations is to evaluate the accuracy of LS-STAG method, to assess the versatility of method for flow applications at various regimes (Newtonian and shear-thinning fluids, steady and unsteady laminar to turbulent flows, granular flows) and to compare its performance with well-established numerical methods (body-fitted and immersed boundary methods)
Cheng, Shang Chin, and 鄭上欽. "Simulation on Performance of Proton Exchange Membrane Fuel Cell." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/02426239673856559844.
Повний текст джерела國立高雄應用科技大學
機械與精密工程研究所
96
ABSTRACT PEMFC’s multiphysics models have established on the logical postulate. To illustrate, proton exchange membranes emphasize the model of water molecule transfer (migration, electroosmosis and diffusion), catalyst layer accents on a model of reaction dynamic, diffusion layer should consider the mix gas in a mathematics model of porous transfer, and gas channel and manifoldmodel have to focus on momentum transfer model. If we want to build a completed multiphysics model of PEMFC, we should resolve equations such as Migration’s Law, Diffusion’s Law and Convection’s Law such as basic Transfer Law and chemical electric electrochemistry reactive equation with Fuel cell. The complicated equations will accompany the increase of parameter to enlarge. In this article, we use COMSOL Multiphysics Modeling Multiphysics software to simulate and analyze proton exchange membrane fuel cell’s current density in cathode. In addition, we use the mass fraction of oxygen, water, and azotes to approximate the result of current distribute. We evidence the Cross-Flow Fields of PEMFC model, and analyze the speed of fluid and water flowing distribution to evaluate the efficiency of fuel cell. In this article, we use mathematics include describing Stefan-Maxwell equations of gas diffuse, Bulter-Volume equations of three phase electrochemical reaction in catalyst layer, energy equations of heat transfer and Darcy’s law of momentum transfer in the diffusion layer. As a consequence, we can find out three points in this article. First, increasing entrance pressure not only raises entrance hydrogen but also increases the concentration of oxygen mass fraction. Moreover, adding convection effective makes more hydrogen and oxygen to participate reaction to the catalyst layer. When the pressure increases to 2atm, the efficiency has postponed. Second, while the temperature becomes higher in inlet, and it makes current lower. Third, we can find the electrochemistry reaction rate of catalyst layer thickness minimum difference under 1μm in different distributed conditions of catalyst layer thickness. Key word:Proton Exchange Membrane、Fuel Cell、COMSOL
Tan, Chi-Kai, and 譚吉凱. "Simulation Analsys on the Performance of Proton Exchange Membrane Fuel Cell." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/31642960854094372643.
Повний текст джерелаFarhad, Siamak. "Performance Simulation of Planar Solid Oxide Fuel Cells." Thesis, 2011. http://hdl.handle.net/10012/6252.
Повний текст джерелаLaio-Hsin-Chang and 廖信璋. "Numerical Simulation on the performance and fluid flow of proton exchange membrane fuel cell." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/72309677631580136246.
Повний текст джерела國立臺灣海洋大學
輪機工程系
94
The main aim of this thesis study is to perform an investigation into the performance related problems with proton exchange membrane fuel cell (PEMFC) using CFDRC software. There are a great number of operating and physical parameters, such as pressure, temperature, humidity, fuel composition, and flow channel influencing the performance of a PEMFC. Mathematical model for a three-dimensional fuel cell are performed including fluid flows, heat transfer, mass transfer, electrochemical kinetics, and electric charge transport. Numerical simulation area includes the channel of positive and negative poles, catalyst, diffusion layers, and membrane within the fuel cell. The numerical model is coupled with a computational fluid dynamics technology that includes the porous gas diffusion electrodes and the reactant flow channels. Three-dimensional spatial distributions of current, temperature, species concentrations, pressure and water are illustrated and discussed in detail by numerical simulation. In proton exchange membrane fuel cells it is particularly important to maintain appropriate pressure and water content in the electrolyte membrane. The water balance depends on the coupling between diffusion of water, pressure variation, and the electro-osmotic drag in the membrane. Last, effects of pressure and humidification temperature of inlet stream and rib-to-channel ratio on the cell performance have been analyzed.
Hui-WenKu and 古慧雯. "Applying Taguchi method and numerical simulation to the parametric study of PEM fuel cell performance." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/77790857279605191387.
Повний текст джерелаLai, Gang-Liang, and 賴綱亮. "Using Simulation to Explore the Effects of Different Factors to the Performance of Cell Production." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/p8yrs2.
Повний текст джерела國立臺北科技大學
工業工程與管理研究所
97
The product differentiation and customization strategy force the production system to shift from mass to high variety low volume production. In recent years, cell production system is proposed to cope with the requirement. In this research, we use the example case from a reference book "Learning to See" for experimental study. Six cell production models were constructed with simulation tool eM-Plant. The number of cells, batch size, rate of setup reduction, methods of kanban assignment are the experimental factors. In supermarket pull supply mode, the multi-cell production system with multi-skill operator, one-piece transfer batch, and dedicated cell rule performs better for demands with high variety low volume and low variety high volume. Setup reduction will make the gap of performance measure among the six cell production models smaller. In make-to-order supply mode, the multi-cell production system with multi-skill operator, one-piece transfer batch, and dedicated cell rule performs better for demands with high variety low volume. However, the single-cell production system with one-piece transfer batch performs better for demands with low variety high volume. In make-to-order supply mode, number of cells should be adjusted according to the shifting of product variety and volume.
Lee, Chia-Hsun, and 李佳勳. "Performance Simulation Analysis of Cell Production System in a Demand Situation with Variety and Minimum Quantity Requirements." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/73698207579396927729.
Повний текст джерела國立高雄第一科技大學
運籌管理所
98
Due to rapid changes in business operation environments, ordering patterns have been shifted from low ordering frequencies with large volumes to that of higher frequencies and smaller volumes. Traditional production lines based on large volume requirement assumption have also been re-designed in cell production lines. Simulation performance analyses among different types of production lines are the focus of the research. A Taiwan hardware (door lock) manufacturer is taken as the study case. Current assembly-line conveyor layout of the case company was designed on mass production basis, which divided processes as detailed as possible to simplify the task and the process handled by each operator. However, such design required a large number of operators and reduced production flexibility. When it handles orders with higher ordering frequencies and smaller quantities, idle labor and labor cost will increase. Bottleneck stations will also shift from being managed effectively. Based on literatures, three types of cell production lines are considered along with current conveyor production line. Simulation mode for each line is constructed using AREA and is tested. Performances among these production lines are compared under selected criteria. Based on simulation results, following conclusions are drawn: 1. Balancing the production lines, different production lines are designed and are compared under the same basis. The short flow line results in a unit operation cost NTD2.97 which is NTD0.82 less than that of current conveyer production line. 2. Meanwhile, only NTD 0.80 unit line-change cost will be caused for short flow line, compared with NTD 1.04 of conveyer flow line. 3. However, cell production lines are usually designed by deleting, combining, or re-arranging tasks. Job enrichment and job training are usually required for operators.
(11206164), Richard T. Roth. "A CHARACTERIZATION OF CEREAL RYE COVER CROP PERFORMANCE, NITROGEN CYCLING, AND ASSOCIATED ECONOMIC RISK WITHIN REGENERATIVE CROPPING SYSTEMS." Thesis, 2021.
Знайти повний текст джерелаCereal rye (Secale cereale, L., CR) is the most commonly utilized cover crop species within the United States. Yet, the total land area planted to CR on an annual basis remains relatively low despite its numerous proven environmental benefits. The relatively low rates of CR adoption could be due to a dearth of knowledge surrounding certain agronomic and economic components of CR adoption. Currently, there exists knowledge gaps within the scientific literature regarding CR performance, N cycling, and associated economic risk. Thus, to address the above-mentioned knowledge gaps, three individual studies were developed to: i) investigate the fate of scavenged CR nitrogen (N) amongst soil N pools, ii) assess the suitability of visible-spectrum vegetation indices (VIs) to predict CR biomass and nutrient accumulation (BiNA), and iii) characterize the economic risk of CR adoption at a regional scale over time.
In the first study, 15N, a stable isotope of N, was used in an aerobic incubation to track the fate of CR root and shoot N among the soil microbial biomass, inorganic, and organic N pools, as well as explore CR N bioavailability over a simulated corn growing season. In this study, the C:N ratio of the shoot residues was 16:1 and the roots was 31:1 and differences in residue quality affected the dynamics of CR N release from each residue type. On average, 14% of whole plant CR N was recovered in the soil inorganic N pool at the final sample date. Correspondingly, at the final sampling date 53%, 33%, and less than 1% of whole plant CR N was recovered as soil organic N, undecomposed residue, and as microbial biomass N, respectively. Most CR N remained unavailable to plants during the first cash crop growing season subsequent to termination. This knowledge could support the advancement of N fertilizer management strategies for cropping systems containing cereal rye.
In the second study, a commercially available unmanned aerial vehicle (UAV) outfitted with a standard RGB sensor was used to collect aerial imagery of growing CR from which visible-spectrum VIs were computed. Computed VIs were then coupled with weather and geographic data using linear multiple regression to produce prediction models for CR biomass, carbon (C), N, phosphorus (P), potassium (K), and sulfur (S). Five visible-spectrum VIs (Visible Atmospherically Resistant Index (VARI), Green Leaf Index (GLI), Modified Green Red Vegetation Index (MGRVI), Red Green Blue Vegetation Index (RGBVI), and Excess of Green (ExG)) were evaluated and the results determined that MGRVI was the best predictor for CR biomass, C, K, and S and that RGBVI was the best predictor for CR N and P. Furthermore, the final prediction models for the VIs selected as the best predictors developed in this study performed satisfactorily in the prediction of CR biomass, C, N, P, K, and S producing adjusted R2 values of 0.79, 0.79, 0.75, 0.81, 0.81, and 0.78, respectively. The results of this study have the potential to aid producers in making informed decisions regarding CR and fertility management.
In the final study, agronomic data for corn and soybean cropping systems with and without CR was collected from six states (Illinois, Indiana, Iowa, Minnesota, Missouri, and Wisconsin) and used within a Monte-Carlo stochastic simulation to characterize the economic risk of adopting CR at a regional scale over time. The results of this study indicate that average net returns to CR are always negative regardless of CR tenure primarily due to added costs and increased variability in cash crop grain yields associated with CR adoption. Further, the results demonstrate that the additional risk assumed by adopting CR is not adequately compensated for with current CR adoption incentive programs and that the risk premium necessary can be 1.7 to 15 times greater than existing incentive payments. Knowledge gained from this study could be used to reimagine current incentive programs to further promote adoption of CR.
WANG, FENG-YEN, and 王豐巖. "A Numerical Simulation on the Performance in the High Temperature Proton Exchange Membrane Fuel Cell with Serpentine Channel." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/7vfk3p.
Повний текст джерела南榮科技大學
工程科技研究所碩士班
105
A three-dimensional numerical model of multi-component mixture transport is presented and implemented in COMSOL Multiphysics to study the affections of the operation parameters and the physical properties on the performance and the electric fields in the high temperature proton exchange membrane fuel cell (PEMFC) with 0.7847mm×1.0mm×20mm. The modeled section of the high temperature PEMFC consist of the gas channels, the anode, the cathode, and the electrodes. The model contains the conservation of mass, momentum, species, and charge with electrochemical reactions. According to the numerical results, both the hydrogen mass fraction in the anode and the oxygen mass fraction in the cathode decrease along the flow direction, but the water mass fraction will increase. The maximum normal current density occurs at the inlet of the cathode. All the parameters, such as the physical properties of the porous electrodes and the operation conditions of the fuel cells, have unapparent effects upon the fuel cell performance and the electric fields at low current density. For high current density, increasing the fuel cell operation temperature, inlet pressure and outlet pressure, the porous material permeability, the porous material conductivity, the bipolar plate conductivity, the cathode stoichiometry, and reducing the fuel cell tortuosity of the porous media can improve the PEMFC performance and the electric fields.
Lin, Huiming, and 林惠民. "Optimum simulation and design for the performance of a three dimensional based thin-film solar cell with grating structures." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/37724044818075835542.
Повний текст джерела華梵大學
電子工程學系碩士班
99
The main purpose of this thesis is to study the characteristic optimization of the structure of an amorphous silicon thin-film solar cell. The experiment is divided into two major parts. In the first part, we used 3D TCAD simulation software to study the thickness of amorphous p, i, and n layers as well as concentration of p and n layers of a typical amorphous silicon thin-film solar cell for characteristic optimization. In the second part, we studied the grating structure of an amorphous silicon thin-film solar cell by applying the best result of the first part to it. In the beginning, for the study of a typical amorphous silicon thin-film solar cell, we started our experiment with a sequence of adjusting the thickness of p, i, and n layers with other parameters fixed to obtain the optimum photoelectric conversion efficiency. We then changed the doping concentration of p, and n layers and finally got the best characteristic result of a typical amorphous silicon thin-film solar cell. For the second part of the study, we made use of the result obtained from the first part as a foundation. Afterward, we added a grating structure on it. We tried seven different grating structures on a typical amorphous silicon thin-film solar cell by varying the height, period, and duty cycle of each grating inorder to improve its photoelectric conversion efficiency. We have designed a special amorphous silicon thin-film solar cell structure which can improve photoelectric conversion efficiency more than 20%.