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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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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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Nodal SP3 method for solving neutron transport equation

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Hedongli Gongcheng/Nuclear Power Engineering 2010年第SUPPL. 2期31卷 73-78+91页

作者： Li, Yun-Zhao Wu, Hong-Chun Cao, Liang-Zhi Yao, Dong School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an 710049 China Science and Technology on Reactor System Design Technology Laboratory Chengdu 610041 China

This paper establishes a nodal method to solve the two coupled equations transformed from the transport equation by SP3 method. In the nodal method, diffusion equation is discretized into average fluxes in the nodes and partial currents on the nodal boundaries. Nodal response relationship is obtained by expanding the detailed nodal flux into a sum of exponential functions. Numerical results demonstrates that the nodal SP3 method can treat polygonal meshes in different shapes with good parallel property, and that it can provide a similar accuracy while runs about six times faster than the nodal-SN (N=4) method DNTR under the same mesh.

关键词： Exponential functions

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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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Finite element analysis for effects of stochastic properties of particles on ratcheting of SiCP/6061Al composites

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Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica 2010年第3期27卷 128-133页

作者： Shao Xuejiao Kang, Guozheng Guo, Sujuan Zhang, Juan School of Mechanics and Engineering Southwest Jiaotong University Chengdu 610031 China National Key Laboratory of Science and Technology on Reactor System Design Technology Design of Nuclear Power Institute of China Chengdu 610041 China

Based on the mesoscopic finite element model of particle reinforced composites, the effects of stochastic properties of SiC particles on the ratcheting behavior of SiCP/6061Al composites were numerically analyzed by employing a 3D multi-particulate unit cell and using an advanced cyclic plastic constitutive model. In the simulation, a 3D multi-particle unit cell containing the stochastic particle properties was first generated by the random sequential adsorption (RSA) method, and then the effects of the number of particles, the particle arrangement, shape, size and their stochastic distributions on the ratcheting of the composites were discussed by the numerical simulations. The results show that the smaller the particulate size and the higher the proportion of the particles distributing near the surface of matrix as well as the more the number of particulates contained in the unit cell, the higher the resistance to the ratcheting deformation. Meanwhile, the modeled composite with uniform distribution of particle size and location presents higher resistance to the ratcheting deformation than that with random distribution. The assumptions of spherical particle and its uniform distributions in size and location in the 3D unit cell can provide a reasonable simulation to the ratcheting of the particle reinforced metal matrix composites.

关键词： Finite element method

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Subgroup method for resonance self-shielding calculation and research on resonance interference effect

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Hedongli Gongcheng/Nuclear Power Engineering 2010年第SUPPL. 2期31卷 5-8+20页

作者： Huang, Shi-En Wang, Kan Yao, Dong Department of Engineering Physics Tsinghua University Beijing 100084 China Science and Technology on Reactor System Design Technology Laboratory Chengdu 610041 China

We combined the subgroup method and the method of characteristics for neutron resonance self-shielding calculation, and programmed a resonance calculation code SGMOC. This code is based on the WIMSD format multi-group data library. The numerical results of SGMOC are in good agreement with those of MCNP, and thus SGMOC has high calculation precision and geometry flexibility. Based on the SGMOC code, we studied two modification methods for the resonance interference effect calculation. The conditional probability method had a correction effect about 30~180 pcm for kinf calculation of UO2 fuel cell. The method by virtue of NJOY code had a correction effect about 20~130 pcm for kinf calculation of UO2 fuel cell.

关键词： Uranium dioxide

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Effect of different textured surfaces on lubricating characteristics of area contact friction pairs

Effect of different textured surfaces on lubricating charact...

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6th CIRP International Conference on Digital Enterprise technology, DET 2009

作者： Hongbin, Liu Lun, Li Yujun, Xue Jishun, Li Wei, Ma School of Mechatronics Engineering Henan University of Science and Technology Luoyang 471003 China Henan Key Laboratory for Machinery Design and Transmission System Luoyang 471003 China

ISBN: (纸本)9783642104299

A theoretical analysis model was developed for area contact friction pairs with different micro- Textures considering cavitation within the fluid film between two faces. Numerical simulation method was used to study the effect of geometric parameters of different micro- Textures on the load carrying capacity and the friction coefficient. Results show that hydrodynamic lubrication problem of textured surfaces has been solved with a single-dimple model and a multi-dimple model. The tendency of the multi-dimple solutions is similar to that of the single dimple model, but the magnitudes of load capacity and friction coefficient are different. © Springer-Verlag Berlin Heidelberg 2010.

关键词： Friction

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A hybrid vector Artificial Physics Optimization with one-dimensional search method

A hybrid vector Artificial Physics Optimization with one-dim...

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International Conference on Computational Aspects of Social Networks

作者： Yang, Gangjun Xie, Liping Tan, Ying Zeng, Jianchao Key Laboratory of Contemporary Design and Integrated Manufacturing Technology Ministry of Education Northwestern Polytechnical University Xi'an 710072 China Arts Department Taiyuan University of Science and Technology Taiyuan Shanxi 030024 China Complex System and Computational Intelligence Laboratory Taiyuan University of Science and Technology Taiyuan Shanxi 030024 China

ISBN: (纸本)9780769542027

The direction of each individual velocity vector is very useful information for search in Artificial Physics Optimization (APO) algorithm. APO's simple way to dealing with the errant individual exceeded the lower or upper bounds constrains changes the direction of its motion vector. A shrinkage coefficient is introduced to ensure that each individual is within the decision space without changing its direction. One-dimensional search method is merged into the vector model of APO (VM-APO) to improve its local search capability. The simulation results confirm that the performance of the hybrid vector APO with one-dimensional search method is effective. © 2010 IEEE.

关键词： Global optimization

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Coding gabor features for multi-modal biometrics

Coding gabor features for multi-modal biometrics

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Chinese Conference on Pattern Recognition

作者： Shen, Linlin Ji, Zhen Li, Yuwen Bai, Li Shenzhen Key Laboratory of Embedded System Design School of Computer Science and Software Engineering Shenzhen University China Shenzhen Institute of Information Technology Shenzhen China School of Computer Science University of Nottingham United Kingdom

ISBN: (纸本)9781424472109

Although biometrics technology has progressed substantially, its performance is still to be improved for real applications. This paper aims to improve the accuracy of personal identification, when only single sample is registered as template, by integrating multiple hand-based biometrics. To make fusion much easier, the same feature, so called fusion code, and decision level fusion strategy are used. Two fusion cases, face & palmprint and FKP & palmprint were taken as examples to verify the effectiveness. Experimental results show that much better performance than single modal biometrics has been achieved. ©2010 IEEE.

关键词： Biometrics

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