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Mathematical modelling and Heat Transfer Performance of a TEG for Engine Exhaust Heat Recovery 2

Mathematical Modelling and Heat Transfer Performance of a TE...

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2020 2nd international conference on computer Modeling, simulation and Algorithm, CMSA 2020

作者： He, Min Wang, Enhua Zhao, Changlu Zhang, Fujun School of Mechanical Engineering Beijing Institute of Technology Beijing China

In recent years, thermoelectric power generation has been investigated widely for waste heat recovery of internal combustion engines. In this paper, the exhaust gas of a heavy-duty diesel engine is used as the heat source. A mathematical model and the simulation program of a large thermoelectric generator(TEG) are established. Using the MATLAB software, the trends of the TEG working parameters in the flow direction are analysed. The flow rate and the temperature of the cold sources, the engine speed and load, and the fin structure parameters of the tube-fin heat exchanger are studied. The results show that the error between the simulated output power and the experimental one is within 11%. A higher engine load rate and a lower coolant temperature are conducive to improving the output power and the conversion efficiency of the TEG. Optimizing the fin spacing and fin height is helpful to improve the heat transfer performance of the heat exchanger and increase the thermoelectric conversion efficiency. © Published under licence by IOP Publishing Ltd.

关键词： Waste heat

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Decomposition Method for Synthesizing the computer System Architecture 2nd

Decomposition Method for Synthesizing the Computer System Ar...

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2nd international conference on computer Science, Engineering and Education Applications, ICCSEEA 2019

作者： Mukhin, Vadym Kuchuk, Nina Kosenko, Nataliia Artiukh, Roman Yelizyeva, Alina Maleyeva, Olga Kuchuk, Heorhii Kosenko, Viktor National Technical University of Ukraine "Kiev Polytechnic Institute" Kiev Ukraine V. N. Karazin Kharkiv National University Kharkiv Ukraine O. M. Beketov Kharkiv National University of Urban Economy Kharkiv Ukraine Southern National Design and Research Institute of Aerospace Industries Kharkiv Ukraine National Aerospace University "Kharkiv Aviation Institute" Kharkiv Ukraine National Technical University "Kharkiv Polytechnic Institute" Kharkiv Ukraine

ISBN: (纸本)9783030166205

The paper considers the problem of synthesizing the architecture of a modern computer system (CS) for managing a complex distributed object. The main stages of the architecture synthesis are analyzed. The necessity of preliminary decomposition, structurization and formalization of the system is substantiated. The main stages of the hierarchical sequence of the decomposition process are given. The decomposition method for synthesizing the architecture of a computer system is developed on the basis of the stratification of the directed graph of CS implementation options. The simulation model of this process was developed. The modelling results showed the feasibility of using the developed method for synthesizing the architecture of a computer system with a large number of nodes. It is shown that the use of the decomposition method is unpractical when there are less than 60 nodes. Using more than 100 nodes is practically advantageous. This method, unlike the existing ones, enables getting results in a reasonable time when using more than 1000 nodes. These results are particularly significant in the context of operational reconfiguration of a system with a large number of nodes. Moreover, the more the number of nodes, the greater the advantage of the method of decomposition. Thus, while synthesizing the computer system architecture to control a complex distributed object at the stage of developing the relationship among the components, the method of decomposition should be used to reduce the time of the process. © 2020, Springer Nature Switzerland AG.

关键词： Directed graphs

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Development of computer adaptive testing on the subject of Digital and Communication simulation using item theory responses 2

Development of computer adaptive testing on the subject of D...

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2nd international conference on Vocational Education of Mechanical and Automotive Technology, ICoVEMAT 2019

作者： Prasetyo, D.Y. Khairudin, M. School of Graduates Studies Universitas Negeri Yogyakarta Indonesia Department of Electrical Engineering Education Universitas Negeri Yogyakarta Indonesia

This article describes the development of an adaptive assessment model. This adaptive assessment model aims to determine the level of students' abilities based on the difficulty level of the items. This type of research uses Research and Development (R & D). It uses the Borg& Gall model that explains, educational research and development is a process used to develop and validate educational product. This development aims to determine the characteristics of the items used as the basis for making computer adaptive testing products by using item theory responses to determine the level of difficulty of the questions, the distinguishing power of each item, and false guesses. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Education computing

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4.15 W SIDO Buck Converter with Low Cross Regulation Using Adaptive PCCM Control 2

4.15 W SIDO Buck Converter with Low Cross Regulation Using A...

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2nd international conference on Smart Power and Internet Energy Systems, SPIES 2020

作者： Lee, Tzung-Je Wang, Chih-Kai Wang, Chua-Chin Cheng Shiu University Department of Computer Science and Information Engineering Kaohsiung83347 Taiwan National Sun Yat-Sen University Department of Electrical Engineering Kaohsiung80424 Taiwan

ISBN: (纸本)9781728166117

A 4.15 W SIDO buck converter is proposed in this paper. By using the adaptive PCCM control, the FW (freewheel) phase is automatic adjusted to improve the efficiency, which is the weakness in traditional PCCM control. Besides, the current mode comparison is utilized, such that the comparators are not required for the mode control. The proposed design is implemented using TSMC 0.18 µm CMOS HV process. Based on the simulation results, the circuit achieves the cross regulation of 0.097 mV/mA and 0.066 mV/mA for the dual outputs with the load current variation from 0.5 A to 0.4 A and from 0.45 A to 0.5 A, respectively. © 2020 IEEE.

关键词： Buck converter

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Comparison of Artificial Neural Network and Support Vector Machine for Long-Term Runoff simulation 2

Comparison of Artificial Neural Network and Support Vector M...

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2nd international conference on Civil and Environmental Engineering, CENVIRON 2019

作者： Hassan, Z. Rosdi, S.Z. Kamarudzaman, A.N. Abdul Rahim, M. Ghazaly, Z.M. Arau Perlis02600 Malaysia

simulation of runoff from a river catchment is a very difficult task and it involves a lot of data which need to be considered. However, the modelling is very essential to forecast the patterns of future runoff by observing and analysing previous patterns of runoff, based on the rainfall. This study presents the evaluation of rainfall-runoff modelling for the long-term runoff series using Artificial Neural Network (ANN) and Support Vector Machine (SVM). Both models are trained and validated using the data series of current and nine (9) antecedent rainfall. During the validation, the SVM model is better in the performance as compared the ANN model, with the R and RMSE values are 0.529-0.711 and 14.27-52.55 mm, respectively. However, the SVM model is underestimated for the peak discharge. Both models have the ability to derive the relationship between the inputs and outputs of the rainfall-runoff process. © Published under licence by IOP Publishing Ltd.

关键词： Runoff

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A framework for generating thermal performance envelope 2

A framework for generating thermal performance envelope

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2nd conference of the Egyptian Affiliation of international Building Performance simulation Association, BSCAIRO 2019

作者： Talaat, Hazem Elmasry, Ayman Ain Shams University Egypt

Throughout the last decade, environmental topics in architecture start to gain interest to preserve natural resources, and to improve the performance of designs. One of the great problems facing architects, is checking whether their designs compromise with the environmental needs or not. thermal performance is one of the main issues related to environmental design. This research proposes a framework for thermal design of envelopes, by simulation and optimization of building envelopes based on computer algorithms and environmental simulation programs. Through analytical methodology, main optimization algorithms and thermal design parameters are analyzed to achieve the framework. It explains the essential concepts of computer programming, and how it is integrated into the architectural design process to achieve thermally efficient envelope. Designer is introduced to computer programming from a theoretical point of view, with an explanation of the types of input needed by the algorithms. In order to achieve this, different types of algorithms and their output, how to define the optimization problem and its variables, the different types of 3D virtual modelling and environmental simulation programs and their role in the process, are discussed. The framework can be summarized in the following steps: building envelope analysis in terms of geometry and its categorization, determining the thermal criteria and target performance, modelling and simulation of the building envelope, and finally applying algorithm and optimization of the envelope's thermal performance. © 2019 IOP Publishing Ltd.

关键词： computer programming

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The simulation and experimental analysis of the gradient temperature forming of the bifocal mirror based on spin-casting 2

The simulation and experimental analysis of the gradient tem...

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2020 2nd international conference on computer Modeling, simulation and Algorithm, CMSA 2020

作者： Fu, Weijie Ning, Lianshuang Zhang, Xinming School of Mechanical and Electrical Engineering Changchun University of Science Technology Changchun China Key Laboratory of Cross-scale Micro and Nano-manufacturing Ministry ofEducation Changchun China

This research employed the methods of simulation analysis and experiment to study the movement trend of the glass melt and the deviation of the junction position of the surfaces in the spin-casting process of the bifocal mirror. By comparing the measurement result of the surface shape in the experiment with the predicted result of that in the simulation, the deviation between these two results is 6.5μm. It is proved that the simulation can predict the surface shape of the mirror blank obtained by spin-casting of the bifocal mirror. Through the results of simulation and experiment, it is found that there is a significant deviation between the junction position of the reflecting surfaces and the expected one. Therefore, by changing the position of the insulation wall, the purpose of compensation for the junction position of the surfaces can be achieved. When the insulation wall was set at different positions for many times of iterative simulation calculation, the deviation of the junction position of the surfaces was reduced from 4.358mm to 3.76 μm. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Mirrors

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Geometric Drawing Method for Form-finding and Force-finding to Triangular Prism Tensegrity with End Surfaces not Paralleled 2

Geometric Drawing Method for Form-finding and Force-finding ...

引用

2020 2nd international conference on computer Modeling, simulation and Algorithm, CMSA 2020

作者： Shang, Renjie Zhao, Yicheng Yin, Zhiqiang Central Research Institute of Building and Construction Co. Ltd Mcc Group Beijing100088 China

The triangular prism tensegrity with arbitrary triangle bottom and end surfaces not paralleled is the most common type tensegrity structure. A geometric drawing method with four steps' process for form-finding was given based on the properity of tensegrity structure, and the degree of freedom for form-finding was analysied. The force-finding method with ten steps' process was given after form-finding, and the self-balancing internal forces was obtained by measuring the lengths of correspondant line segements. The geometric drawing method was carried out in CAD software by an example, and the example tensegrity structure obtained by the method was analysed by finite element method software, the correctness of the method was verified. The form-finding method is the geometric implementation of the force density method, and the process is intuitive and controllable, it is suitable and operational for triangular prism of tensegrity structures of any shape. © 2020 Published under licence by IOP Publishing Ltd.

关键词： computer aided design

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2nd international conference on Electronic Engineering and Informatics

2nd International Conference on Electronic Engineering and I...

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2020 2nd international conference on Electronic Engineering and Informatics, EEI 2020

The proceedings contain 96 papers. The topics discussed include: finite element dynamic and static analysis of agaricus bisporus picking robot mobile platform;internal control of accounting information system in regional chain technology;the effective application of image processing technology in the practice of environmental art courses under the background of internationalization;ENMFM algorithm applicable for the multi-source heterogeneous data source model of power grid regulatory cloud platform;new energy power prediction optimization based on improved TF-IDF single machine information feature extraction;CIM/G graphics automatic generation in substation primary wiring diagram based on image recognition;refractive index sensing based on terahertz spoof surface plasmon polariton structure;a new clustering and sorting algorithm for radar emitter signals;application of intelligent control in industrial process control automation;research on big data storage and compression method for dual core intelligent meter;a computer vision based detection system for trash bins identification during trash classification;simulation analysis of complex electromagnetic environment effect of helicopter engine;and high efficient polymer solar cell processed by environment-friendly solvent system.

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computer simulation of horizontal vpe grown aln 2nd

Computer simulation of horizontal vpe grown aln

引用

2nd international conference on Clean Energy Materials and Technology, ICCEMT 2019

作者： Liu, Jiaqi Xie, Xinjian Yang, Qinghao School of Materials Science and Engineering Xi'an University of Science and Technology Xian710054 China School of Science Hebei University of Technology Tianjin300401 China

ISBN: (纸本)9783035716405

The three-dimensional growth chamber model was established by GAMBIT software, and the FLUENT software was used to simulate the Vapor Phase Epitaxy (VPE) growth AlN material. By changing parameters, results of simulation were obtained, in turn described the effect of uniformity and concentration of AlN. The study mainly focuses on the research of flow velocities of nitrogen and argon gas, the distance from the substrate to the inner tube mouth, the substrate front-back angular height difference, the inner tube diameter, and the substrate thickness. It is discovered through the research: above parameters play a very important role in the crystal growth of AlN film, and there are optimal parameter values. The structure of growth chamber is designed and optimized according to the simulation result. By using the simulation software, experimental costs can be greatly saved, which provides a theoretical basis for the optimal growth process of high quality AlN film, and has a certain guiding role for the actual growth process. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Aluminum nitride

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