三维粘弹性参数反分析

Back Analysis for 3 D Viscoelasticity

假设材料符合粘弹性流变模型，采用线性逼近的优化措施进行流变参数反分析，为了改善反演效率，在优化迭代格式中引进了阻尼因子，并对阻尼因子的选择作了数值尝试，迭代计算是稳定收敛的，且速度较快．同时编制了建立在三维有限元基础上的粘弹性参数反分析程序．文末给出了计算实例．

In this paper, rock is supposed to be a viscoelastic material. The optimization of linear approaching is adopted for the back analysis of viscoelasticity parameter. In order to improve the method, the variable damping factor is introduced in the optimun iteration. The selection of the damping factor is tested numerically, and a good result is achieved.