针对多层黏弹性复合材料结构阻尼性能设计优化问题,运用能量法既考虑其面内应变能,又考虑其横向剪切应变能,建立其损耗因子的计算模型,并用实验方法验证其挠度函数的可行性。然后以多层黏弹性复合材料结构的损耗因子最大化为优化目标,用改进遗传算法对其阻尼性能进行单变量和多变量优化设计。数值结果表明,应用遗传算法优化设计多层黏弹性复合材料结构阻尼性能效果明显。多变量优化设计的结果优于单变量优化设计,多层黏弹性复合材料结构的损耗因子由原始设计的0.184增大到优化设计后的0.287。

For the damping optimization of composite structures with multi-interleaved viscoelastic layers,a computational model is built for the loss factor by the energy method, in which the strain energy stored in the in-plane as well as in transverse shear is considered,and its deflection function is assured to be perfect by means of an experimental method. The optimization goal is the maximum of the loss factor of composite structures with multi-interleaved viscoelastic layers. Optimization designs are made of a single variable and multi-variables optimization for the loss factor by improved genetic algorithms. The numerical results show that the improved genetic algorithms are available for the damping optimization design of composite structures with multi-interleaved viscoelastic layers, and that the multi-variable optimization design is better than single variable optimization design. After the damping optimization design, the loss factor of composite structures with multi-interleaved viscoelastic layers is improved from the original result of 0.184 to 0.287.