Constants of viscoelastic material described by prony series constitutive relation are deduced . for the case of interface crack in viscoelastic material infinite board under the load of mixed type 1 , 2 and type 3 respectively , laplace transform is used to change the basic equations from time domain to frequency domain . according to the corresponding principle , viscoelastic solution can be obtained by substituting the viscoelastic constant into elastic one 对本构关系由prony级数描述的含界面裂纹的双粘弹性材料无限大板,分别研究了受、型混合外载及型外载的情况,用laplace变换将其时域基本方程变换到频域,根据对应原理,将粘弹性常数代入弹性解,得到频域中的粘弹性解。
According to an analysis of the current various optimum methods , a new mixed type of genetic algorithm are proposed , which overcomes some typical limitations such as the decrease of hunting efficiency lack of hunting competence near the optimal solution . with a model for optimum design setup , the system brwcad are worked out with the advanced language visual basic6 . 0 and the object - oriented technique 此外，针对衡重式挡土墙常规设计存在的弊病，指出其优化设计的必要性与重要性，并在比较分析已有优化方法优缺点的基础上，引入并提出了一种新型混合遗传算法进行优化设计，解决了临近最优解搜索效率降低、搜索能力不足等缺陷。
