基于三维谱单元模型的路面结构动力反演系统

提出一类用于三维层状体系的谱单元,使其解决三维层状体系受冲击荷载的动力问题。结构中的每一层在频域内被模拟为两节点谱单元或单节点谱单元。非线性优化方法--Powell法用于解决层状系统的参数反演的问题。以3层路面体系为例,对其进行了动力荷载下的响应分析,并与有限元的计算结果进行了对比,两者的吻合良好。并且由例证可见,反算的算法收敛稳定,计算效率高。

Inverse dynamic system for pavement structure based on 3D spectral elements

A new type of spectral element was proposed to solve the problems of three-dimensional multi-layered system subjected to an impulsive load. In frequency domain, each layer in structure was simulated as two-noded or one-noded spectral element. In order to identify the parameters of layered system, a nonlinear optimization method called Powell algorithm was employed. Both the proposed method and finite element method were applied to analyze the dynamic response of a three-layered structure subjected to an impact. And the two results agreed well with each other. Moreover, in the case of the inverse calculation, it was shown that the stable and efficient convergences were obtained.