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IEEE International Conference on Computer-Aided design and Computer Graphics

作者： Wenshan Fan Bin Wang Jianliang Zhou Jiaguang Sun Tsinghua University Beijing Beijing CN Key Laboratory for Information System Security Ministry of Education of China China School of Software Tsinghua University China Tsinghua National Laboratory for Information Science and Technology China Beijing AeroSpace Control Center China

We present a fast collision detection method for deformable surfaces with parallel spatial hashing on GPU architecture. The efficient update and access of the uniform grid are exploited to accelerate the performance in our method. To deal with the inflexible memory system, which makes the building of stream data a challenging task on GPU, we propose to subdivide the whole workload into irregular segments and design an efficient evaluation algorithm, which employs parallel scan and stream compaction, to build the stream data in parallel. The load balancing is a key aspect that needs to be considered in the SIMD parallelism. We break the heavy and irregular collision computation down into lightweight part and heavyweight part, ensuring the later perfectly run in load balancing manner with each concurrent thread processes just a single collision. In practice, our approach can perform collision detection in tens of milliseconds on a PC with NVIDIAGTX 260 graphics card on benchmarks composed of millions of triangles. The results highlight our speedups over prior CPU-based and GPU-based algorithms.

关键词： Graphics processing unit Computational modeling Arrays Benchmark testing Compaction Deformable models Buildings

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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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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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Computational method for crack-opening-area of nuclear pressure pipe with circumferential through-wall crack

Computational method for crack-opening-area of nuclear press...

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18th International Conference on Nuclear Engineering, ICONE18

作者： Jun, Liu Bo, Yan Naibin, Jiang Department of Engineering Mechanics Chongqing University Chongqing 400044 China National Key Laboratory of Science and Technology on Reactor System Design Technology Nuclear Power Institute of China Chengdu Sichuan China

ISBN: (纸本)9780791849330

The determination of crack-opening-area (COA) is very important in the application of LBB technique. A numerical method based on coupled finite element-meshless Galerkin method (FEM/EFG) is proposed to calculate the crack-opening-area of cracked pipes in nuclear power station. By means of the method by which the meshless nodes are used in the vicinity of crack front and the finite elements are applied in remained zone, the resolved domain is numerically discreted. This technique can speed up the set up of the numerical model and improve the computational precise. Based on the displacement field determined by the coupled FEM/EFG, a kind of surface integral method is used to accurately calculate the crack-opening-area. The correctness and validity of the presented method are demonstrated by comparing the COA results of centre-cracked panel under uniform load determined by the presented method with those from theoretic formula. Subsequently the numerical method for cracked panel is employed to calculate the crack-opening-area of nuclear pressure pipe. The numerical COA results are compared with those determined by engineering methods. It is shown that for thick-wall or middle-thick-wall pipes, the COA results obtained by the presented method are more conservative than those by the engineering methods, whereas for thin-wall pipes, the results by the later one are more conservative than those by the former. © 2010 by ASME.

关键词： Numerical methods

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design and Control of a Coupling Mechanism-Based Prosthetic Hand

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Journal of Shanghai Jiaotong university(science) 2010年第5期15卷 571-577页

作者：王新庆刘伊威姜力杨大鹏李楠刘宏黄海 State Key Laboratory of Robotics and System Harbin Institute of Technology Institute of Robotics and Mechatronics German Aerospace Center Key Laboratory of Science and Technology for National Defence of Autonomous Underwater Vehicle Harbin Engineering University

A five-fingered,multi-sensory and biomimetic hand is *** cambered palm is specially designed by utilizing the knowledge of *** position of each finger is arranged according to human hand *** finger with three phalanges could fulfill flexion-extension movement *** the fingers are designed using coupling link *** location of the thumb is designed by maximizing interaction area between the thumb and other *** opposite thumb could grasp along a cone surface,while maintaining its *** hardware architecture is divided into control system and human-machine interaction *** mechanical parts,sensors and motion control systems are integrated in the hand *** addition,a skin-like glove is designed,which makes the hand more *** to our primary experimental results,the hand can accomplish several grasp modes by applying an intuitive surface electromyography control *** success rate of 10 modes is up to 90%.

关键词： prosthetic hand coupling mechanism electromyography control support vector machine (SVM)

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Research on control and operation support integrated system for nuclear power plants

Research on control and operation support integrated system ...

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2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010

作者： Zhi, Chen Yao, Zhang Chen, Deng-Ke Ren, Yu National Key Laboratory of Design Technology of Nuclear Reactor System Nuclear Power Institute of China Chengdu China Department of Nuclear Power Science and Engineering Naval University of Engineering Wuhan China

ISBN: (纸本)9781424479566

At present, the information and control system (I&C) and operation support system (OSS) of the nuclear power plants (NPPs) are designed separately;their structures and functions are independent. So, the compatibility, availability and dependability of them are not desirable, and the comprehensive advantages of them are not to exert fully. In order to resolve these problems, this paper presents a new idea that designing and developing the I&C and the OSS coordinately, so that their structures and functions are integrated. Firstly, this paper reviewed the evolution and application status of the OSS. And then, the realization methods and forms for the integrated system are analyzed. At last, the hierarchy and architecture of the integrated system which have the double-functions of the I&C and OSS is founded. Analysis and study is also carried out in terms of the hierarchy and characteristics of the integrated system. © 2010 IEEE.

关键词： Nuclear power plants

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Generalized coarse-mesh finite difference acceleration for the method of characteristics

Generalized coarse-mesh finite difference acceleration for t...

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International Conference on the Physics of reactors 2010, PHYSOR 2010

作者： Chai, Xiaoming Yao, Dong Wang, Kan National Key Laboratory of Science and Technology on Reactor System Design Technology in China P. O. Box 622-509 Chengdu 610041 China Department of Engineering Physics Tsinghua University Beijing 100084 China

ISBN: (纸本)9781617820014

Based on generalized coarse mesh rebalance (GCMR) method, this paper proposes a new acceleration method for the method of characteristics (MOC) in unstructured meshes: the generalized coarse-mesh finite difference (GCMFD) method. The GCMFD method, which applies equivalent width of coarse mesh to establish the finite difference discretization, can use unstructured coarse meshes composed of adjacent fine meshes to speed up the MOC iteration. The convergence property of the GCMFD method is controlled by width factor. However, the optimal width factor cannot be given a priori. Method of adjusting width factor automatically is proposed in this paper. Finally, the GCMFD method is adopted in the 3-D neutron transport MOC code TCM. Numerical tests show that the GCMFD, using generalized-geometry coarse meshes, can accelerate the MOC iteration with good speedup.

关键词： Iterative methods

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Modeling and Analysis of Novel Integrated Radial Hybrid Magnetic Bearing for Magnetic Bearing Reaction Wheel

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Chinese Journal of Mechanical Engineering 2010年第5期23卷 655-662页

作者： HAN Bangcheng Key Laboratory of Novel Inertial Instrument ＆ Navigation System Technology of Fundamental Science for National Defense Beihang University Beijing 100191 China School of Instrument Science and Opto-electronics Engineering Beihang University Beijing 100191 China

Conventional ball bearing reaction wheel used to control the attitude of spacecraft can＇t absorb the centrifugal force caused by imbalance of the wheel rotor,and there will be a torque spike at zero speed,which seriously influences the accuracy and stability of spacecraft attitude *** with traditional ball-bearing wheel,noncontact and no lubrication are the remarkable features of the magnetic bearing reaction wheel,and which can solve the high precision problems of *** general,two radial magnetic bearings are needed in magnetic bearing wheel,and the design results in a relatively large axial dimension and smaller momentum-to-mass *** this paper,a new type of magnetic bearing reaction wheel（MBRW） is introduced for satellite attitude control,and a novel integrated radial hybrid magnetic bearing（RHMB） with permanent magnet bias is designed to reduce the mass and minimize the size of the MBRW,*** equivalent magnetic circuit model for the RHMB is presented and a solution is *** stiffness model is also presented,including current stiffness,position negative stiffness,as well as tilting current stiffness,tilting angular position negative stiffness,force and moment equilibrium *** design parameters of the RHMB are given according to the requirement of the MBRW with angular momentum of 30 N ？ m ？ s when the rotation speed of rotor reaches to 5 kr/*** nonlinearity of the RHMB is shown by using the characteristic curves of force-control current-position,current stiffness,position stiffness,moment-control current-angular displacement,tilting current stiffness and tilting angular position stiffness considering all the rotor position within the clearance space and the control *** proposed research ensures the performance of the radial magnetic bearing with permanent magnet bias,and provides theory basis for design of the magnetic bearing wheel.

关键词： magnetic bearing reaction wheel radial hybrid magnetic bearing equivalent magnetic circuit current stiffness position negative stiffness tilting current stiffness tilting angular position stiffness

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Loading pattern optimization cooperatively using two new algorithms

Loading pattern optimization cooperatively using two new alg...

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International Conference on the Physics of reactors 2010, PHYSOR 2010

作者： Gong, Zhaohu Wang, Kan Yao, Dong Department of Engineering Physics Tsinghua University Beijing 100084 China National Key Laboratory of Science and Technology on Reactor System Design Technology Nuclear Power Institute of China P.O.Box 622-501 Chengdu Sichuan 610041 China

ISBN: (纸本)9781617820014

Loading pattern optimization (LPO) for a PWR in nuclear power plant contains three parts: fuel assembly location optimization, burnable poison placement optimization, and used fuel assembly orientation optimization. To solve the former two parts, this paper devises an innovative stochastic evolutionary algorithm - Interval Bound Algorithm (IBA), which can optimize fuel assembly location and burnable poison placement together. IBA just uses the fuel assembly's infinite multiplication factor to get rid of unfavorable patterns and to explore new promising solution space. To solve the last part, this paper applies Estimation of Distribution Algorithms (EDAs), which also belong to evolutionary algorithms. These three parts depend on each other, so it is better not to solve them separately. In order to optimize these parts in a coupled way, we use Symbiotic Co-evolutionary Algorithm (SCA) to incorporate IBA and EDAs. This technique could reflect the real optimization process. Based on these algorithms, the corresponding LPO code of IBALPO is developed. To avoid search direction to offset for inconsistency between the LP search code and the design code, IBALPO directly adopts production core design code to evaluate LPs in a parallel computation environment. Finally, this code system is used to solve a realistic reload problem to show its performance. Obtained results have illustrated that IBALPO is efficient and robust. It can find satisfying LPs in two days using 18 CPUs after evaluating about 10000 LPs for a core containing 157 assemblies.

关键词： Nuclear power plants

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