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Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Improved Particle Swarm Optimization Algorithm Based on Transformer Substation Grounding System ZHAO Can-Hui, ZHU Yan-Bin, LI Ming-Gang journal6    2016, 37 (1): 49-53.   DOI: 10.3969/j.cnki.jdxb.2016.01.012 Abstract （2102）      PDF（pc） （667KB）（1544）       Knowledge map    Save To solve the problem that the unequal electric potential of grounding grid can be caused by the use of steel instead of copper as a conductor.The improved PSO algorithm is used to optimize the docking system,and the optimization objective function is set up by using double layer soil and unequal potential model. The traditional particle swarm algorithm is improved through the method of fission gregarious variation to solve the problem of premature convergence and slow convergence.The simulation model was built by the actual system parameters of the grounding system of a substation. The Matlab simulation results show that compared with the equally distributed grounding system of the 80 m×60 m and 120 m×100 m substation,the unequally distributed grounding voltage according to the exponential rule by the   improved particle swarm optimization algorithm can achieve 21.65% and 23.45%. The difference of the maximum current density is 18.05% and 10.26%.It is concluded that the optimized design method of substation grounding system in this paper can effectively reduce the difference of maximum contact voltage and current density,and can effectively improve the security of the grounding system. Reference | Related Articles | Metrics | Comments（0） Select Study of Vertical Vibration of Vehicles-Long-Span Continuous Rigid Frame Bridge Based on Matlab-Midas DAI Ke-Yi, CHEN Rui-Lin, CHEN Huan, REN Hai-Long, LU Ya-Ping journal6    2016, 37 (1): 54-59.   DOI: 10.3969/j.cnki.jdxb.2016.01.013 Abstract （2427）      PDF（pc） （577KB）（1578）       Knowledge map    Save To study the characteristics of vertical vibration of vehicles-long-span continuous rigid frame bridge，the solution of wheel-track force was automatically figured out based on creep theory in combination with Matlab program.The simulative wheel rail force was then input into the finite element analysis model of bridge to get the vertical vibration of the bridge.The simulation results show that the Mablab-Midas model solution of vertical vibration response of bridge is highly feasible and convenient.Taking a certain large continuous rigid frame bridge as an example,the vertical dynamic responses from the electric motor trains of CRH1,CRH2,CRH3,CH4 are analyzed respectively.Results show that the type CRH4 vertical displacement of the dynamic response is greater than the other three types, but general trend of change on four kinds of models is consistent. Reference | Related Articles | Metrics | Comments（0）