变阻尼层复合梁动力特性的优化分析

Optimization Analysis of Dynamic Characteristics of Damping-Variable Composite Beam

为了提高变截面梁的优化分析效率,节省计算时间,利用微分变换方法计算量小、效率高的特点,分析了各种参数改变对复合阻尼梁动力特性的影响。分析结果表明:增加梁的长度、降低阻尼材料的杨氏模量和基底层厚度,可以降低复合结构的模态频率;增加阻尼层厚度、降低基底梁厚度、增加阻尼层材料的杨氏模量或损耗因子,可以提高变阻尼层复合梁的模态损耗因子。

This paper attempts to improve the efficiency in analyzing a composite beam with variable cross-section and reduces the computation time.Considering the advantages of few calculation burden and high efficiency,the differential transformation method(DTM)was applied to study the impacts of various parameters on the dynamic characteristic of the composite beam with internal damping.The results show that the modal frequency of composite structures will decrease when the length of the beam and the amount of the Young module increase,as well as the thickness of the base layer decreases;the modal loss factor of composite structures will increase when the thickness of the damping layer and the height of the base beam are both reduced,as well as the value of the Young module and loss factor in the damping layer increases.