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International Conference on Electronics, Communications and Control (ICECC)

作者： Guoqiang Zheng Tingting Wei Jishun Li Electronic Information Engineering College Henan University of Science and Technology Luoyang China Henan Key Laboratory for Machinery Design and Transmission System Henan University of Science and Technology Luoyang China

A MISO cooperative transmission algorithm for clustering wireless sensor network is proposed in this paper. In this algorithm, we choose cooperative nodes according to cooperative threshold, and optimize nodes' transmission power with finite-rate feedback. Then we analyze the implementation process in detail, derive the method of optimizing parameters. In the end verify this algorithm at simulation platform. The result shows that, this MISO cooperative transmission algorithm for clustering wireless sensor network can reduce transmission power of transmitting nodes effectively. So this algorithm can reduce the energy consumption, and also extend the life cycle of the whole wireless sensor network certainly.

关键词： Clustering algorithms Wireless sensor networks Channel state information Vectors Energy consumption MIMO Array signal processing

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Nonlinear dynamic analysis of LOCA based on Secondary development of ANSYS

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Hedongli Gongcheng/Nuclear Power Engineering 2011年第SUPPL. 1期32卷 98-102页

作者： Qi, Huan-Huan Zeng, Zhong-Xiu Zhang, Yi-Xiong Liu, Wen-Jin Wang, Wei Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu 610041 China

In this paper, nonlinear dynamic response under loss of coolant accident (LOCA) transient in the nuclear reactor coolant system (RCS) is investigated with ANSYS program. Many nonlinear factors, such as different structural stiffness in tension and compression, gap and plastic strain caused by main pipes' break etc. are considered. The Secondary development of ANSYS is performed to form the customized module for implementing effective parameterized and modular modeling and LOCA nonlinear analysis. Comparison of the results calculated by ANSYS and program-specific shows that the results are generally consistent, but there are some differences locally. According to the experience of transient dynamic analysis, and there are so many non-linear factors in the reactor coolant system, the difference is acceptable. The efficiency of this engineering analysis is improved remarkably with the convenience of input and modeling, viewable layout and automatic creating of reports, when using the customized module based on ANSYS.

关键词： Loss of coolant accidents

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Model design of new product management information system based on BPR

Model design of new product management information system ba...

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International Conference on system science, Engineering design and Manufacturing Informatization (ICSEM)

作者： Xianzhao Jia Dong Fei Liu Hongbin School of Electrical Engineering Henan University of Science and Technology Luoyang 471003 China Henan Key Laboratory of Modem Mechanical Design and Transmission System Luoyang China School of Electrical Engineering Henan University of Science and Technology Luoyang China

Based on BPR theory, the new product development and manufacturing process status of a discrete manufacturing enterprise was analysed with finding out its existing problems, then a new reasonable process was designed and the model of management information system was established. Through the analysis of this case, this paper provides a reference for other similar enterprises to manage new product development and promote the development of enterprise information.

关键词： Schedules Finance Business process re-engineering Bills of materials

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The uncertainty optimization of vehicle occupant restraint system based on interval number programming

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Qiche Gongcheng/Automotive Engineering 2011年第1期33卷 6-10页

作者： Li, Fangyi Li, Guangyao Zhang, Jiahong Sun, Guangyong Zhang, Zheng School of Automotive and Mechanical Engineering Changsha University of Science and Technology Changsha 410114 China Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Changsha 410082 China Autoliv Vehicle Safety System Technical Center Co. Ltd Shanghai 201807 China

The uncertainty optimization of vehicle occupant restraint system is studied in this paper based on interval number programming. Firstly a simulation model for occupant restraint system is set up using MADYMO software with the model verified by tests. Then, a weighted injury criterion is taken as objective, and the stiffness and upper anchor position of seat belt, as well as the tearing force and stretch length of force limiter etc are selected as design variables with the stiffnesses of seat and knee bolster as uncertain variables, and the uncertainty optimization is transformed into certainty optimization by using interval number programming. Next, the surrogate models for objective and constraint functions are built with Latin hypercube experiment design, and by utilizing sequential quadratic programming and genetic algorithms as the solvers for inner and outer layers respectively, an optimization is performed. Finally the approximately optimum solutions of the parameters of occupant restraint system are obtained.

关键词： Stiffness

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Investigations on friction resistance of forced circulation in a circular tube under inclination and rolling conditions

Investigations on friction resistance of forced circulation ...

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18th International Conference on Nuclear Engineering, ICONE18

作者： Du, Sijia Hong, Zhang Department of Engineering Physics National Key Laboratory of Science and Technology on Reactor System Design Technology of Nuclear Power Institute of China China National Key Laboratory of Science and Technology on Reactor System Design Technology of Nuclear Power Institute of China China

ISBN: (纸本)9780791849323

The friction resistance under marine conditions is very important to a marine reactor system in the ocean. The traditional empirical or semi-empirical relationships were used in thermo-hydraulic system programmes at the present time, while the applicability of these relationships under ocean conditions was not validated adequately. Experiments have been conducted to study the friction resistance of forced circulation when the test tube was at inclined attitude and rolling model. The experimental setup consists of stainless steel cylinder tube as test section with 10mm inside diameter and 1200mm length, is subjected to a constant wall heat flux boundary condition. The investigation covers Reynolds number range from 1.0e+4 to 1.2e+5, and the test section angles of inclination including 10°, 20°and 30°, amplitudes of rolling angle including 10°, 15°and 20°with the rolling periods of 10s, 15s and 20s. Pressure drop was measured to calculate the coefficient of friction resistance. CFD method was used to simulate the flow characteristics under inclination and rolling conditions, the results were compared with experimental data. The investigations showed that the influence of inclination and rolling to friction coefficient is not obvious. © 2010 by ASME.

关键词： Reynolds number

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Radar equation of high-speed weak target

Radar equation of high-speed weak target

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International Conference on Advanced Mechatronic systems (ICAMechS)

作者： Cun-suo Pang Nan Zhang Xiang-yang Lu National Key Laboratory for Electronic Measurement Technology Key Laboratory of Instrumentation Science and Dynamic Measurement of Ministry of Education North University of China Taiyuan China Second System Design Department of the Second Research Academy of CASIC Beijing China Electrical Engineering Department Electrical Engineering Department Zhengzhou China

Without considering the echo signal power changes caused by target distance changes during the accumulated time the traditional radar equation is hardly applied. We take account of the effects of velocity, signal-to-noise ratio during the processing time; a modified radar equation is built which can be used for long-time integration of weak targets with high speed. After analyzing the relation between detection range and target velocity, integration time with processing time, we draw the constraint conditions and the corresponding conclusions.

关键词： Radar Laboratories Silicon compounds Equations Instruments Power measurement Velocity measurement

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Prediction of the critical heat flux in subcooled flow boiling in round tube using an improved mechanistic model

Prediction of the critical heat flux in subcooled flow boili...

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18th International Conference on Nuclear Engineering, ICONE18

作者： Na, Yu Yu, Zhang National Key Laboratory of Science and Technology on Reactor System Design Technology Nuclear Power Institute of China Chengdu Sichuan 610041 China

ISBN: (纸本)9780791849323

Among the existing CHF models, the bubble crowding model and the liquid sublayer dryout model have been well accepted for subcooled flow boiling. But both of the two models couldn't give explanation about some details in the boiling crisis phenomenon according to photographic result. The aim of the present paper is to provide an improved synthesized model containing the characteristic of the above two models and then to give a comprehensive explanation about CHF. In the present model, the conservation equations of mass and energy are solved to derive the CHF formula. The length and velocity of the vapor blanket and the thickness of the liquid sublayer are needed. The quality and void fraction in bubble region and the core region are calculated by a homogeneous assumption. The vapor blanket length is thought to be equal to the Helmholtz wavelength and it is obtained from several parameters in the bubble region. The velocity of the vapor blanket is connected to the flow velocity of the bubble layer. The thickness of the sublayer is determined by a force balance on the vapor blanket, which is also related to the condition of the bubble region. About 1100 experimental points have been selected to verify the proposed model. Comparison between the predictions by the proposed model and the experimental result shows a good agreement that more than 90% of these data are predicted within ±20%. © 2010 by ASME.

关键词： Void fraction

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Study on fracture toughness prediction for A508-III steel based on Master Curve approach

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Hedongli Gongcheng/Nuclear Power Engineering 2011年第SUPPL. 1期32卷 31-34页

作者： Fang, Ying Li, Hui Hui, Hu He, Yin-Biao Li, Pei-Ning Key Laboratory of Safety Science of Pressurized System East China University of Science and Technology Shanghai 200237 China Shanghai Nuclear Engineering Research and Design Institute Shanghai 200233 China

In this study, tensile test and Charpy impact test of domestic A508-III steel are carried out in the ductile-brittle transition range, in which obtained the mechanical properties and temperature dependence of Charpy impact energy. Fracture toughness test temperature is determined through the correlation with characteristic temperature, at which Charpy impact energy is 28 J or 41 J. The Master Curve of 12.7 mm SE(B) is respectively from the single-temperature and multi-temperature method, and measured T0 was valid. The result shows that the reference temperature T0 derived from two methodsis basically consistent. And the reference temperature T0 of domestic A508-III steel is about -63°C.

关键词： Fracture toughness

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Research on the influence of ocean condition on the oscillation in parallel double-channel

Research on the influence of ocean condition on the oscillat...

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18th International Conference on Nuclear Engineering, ICONE18

作者： Zhou, Linglan Hong, Zhang Department of Physic Engineering Tsinghua University China National Key Laboratory of Science and Technology on Reactor System Design Technology Nuclear Power Institute Of China China

ISBN: (纸本)9780791849323

In this paper, the flow oscillation in the parallel multichannel system has been studied under ocean condition with RELAP5/MC. A double-channel boiling system model is built using the code RELAP5/MC and it is proved to be capable of simulating the instable phenomena. The influences of rolling, heaving and inclination on the flow oscillation have been analyzed. The result shows that the effect of lengthways rolling on the oscillation in parallel channels can be ignored. The influence of athwartships rolling and heaving reveals resonance effect, that is, when the rolling cycle is close to the oscillation cycle and half cycle respectively, the oscillation would happen earlier, when the difference between the cycles is large, the impact of rolling can also be ignored. The influence of inclination on the oscillation in parallel channels is feeble. © 2010 by ASME.

关键词： Oscillating flow

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Formal definition method of denotational semantics and functions for PLC program language

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Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (science and technology) 2011年第SUPPL. 1期42卷 1107-1113页

作者： Xiao, Li-Tian Gu, Ming Sun, Jia-Guang National Laboratory for Information Science and Technology School of Software Tsinghua University Beijing 100084 China Key Laboratory for Information System Security of Ministry of Education Department of Computer Science and Technology Tsinghua University Beijing 100084 China Beijing Special Engineering Design and Research Institute Beijing 100028 China

In order to verify the correctness of PLC programs by formal methods, the definition of denotational semantics on PLC program language was studied to achieve PLC programs modeling and model checking. Based on the extended λ-calculus definition, the configuration of PLC program architecture, denotational semantics of PLC programs and functions of denotational semantics were defined, which proves the basis of model checking and theorem.

关键词： Model checking

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