This article derived four finite element time-domain integration methods and applied them to calculate and ana-lyze the accuracy of displacement identification response in triangular truss structures through simulation.The stiffness ma-trix and mass matrix were established separately by using the finite element method,and the size of the time step was deter-mined.The degree of freedom displacement error calculation of different time-domain integration methods was determined based on the solution of the modal superposition method.The results show that under normal circumstances,a time step co-efficient of τ=1/3 can provide the best accuracy.Compared with other methods,Wooram Kim's two-stage explicit time-do-main integration method can ensure higher accuracy of displacement identification,present small overshoot at inflection points,and have higher stability in simulation calculations.
关键词
时域积分法/结构动力学/三角形桁架结构/有限元法
Key words
time integration method/structure dynamics/triangular truss structure/finite element method
维普
万方数据