局部约束阻尼柱壳振动分析及优化设计  

Vibration analysis and optimization design of a cylindrical shell treated with constrained layer damping

作　　者：石慧荣[1] 高溥[1] 李宗刚[1] 赵冬艳[1] 张军平[1] 

机构地区：[1]兰州交通大学,兰州730070

出　　处：《振动与冲击》2013年第22期146-151,173,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(61064008);教育部科学技术研究重点项目(211185);甘肃省联合基金(595170);兰州交通大学青年科学基金项目(2012014)

摘　　要：针对圆柱壳振动特性,给出局部约束阻尼柱壳模型。基于弹性、粘弹性本构方程用能量法建立动力学方程,研究阻尼段结构参数变化对振动特性影响。建立以阻尼轴向与周向分段数、阻尼段轴向与周向间隙、阻尼层厚度为设计变量,前三阶模态最大损耗因子为目标函数,利用多目标遗传算法对两端简支柱壳进行优化分析。通过分析、比较优化前后结构模态固有频率变化、损耗因子变化及幅频响应表明,合理贴敷阻尼段能有效减少阻尼材料用量,且在不改变柱壳固有振动属性条件下能达到更好的减振效果。Aiming at the vibration characteristics of cylindrical shells, a cylindrical shell treated with partial constrained layer damping was presented. Its dynamic equation was established based on the constitutive equations of elastic and viscoelastic materials with the energy method. The influence of the damped patch＇s key parameters on the shell vibration characteristics was investigated. A multi-objective function was established, the objectives of optimization were to maximize the loss factors of the first three modes, and the design variables were the number of damped patches and the gap in axial and circumferential directions, and the thickness of damping layer. An optimization for a cylindrical shell with simply supported edges was performed using the multi-objective genetic algorithm. By analyzing and comparing the modal frequencies changes, and the variations of loss factors and the amplitude-frequency responses of the cylindrical shell before and after optimization, it was shown that a reasonable layout of damping layer segments can reduce the comsumption of damping materials effectively, and can achieve a better vibration reduction effect without changing the dunamic characteristics of the cylindrical shell.

关 键 词：约束阻尼 振动 柱壳 优化设计 遗传算法 

分 类 号：TB535[理学—物理]