薄壁结构约束阻尼板减振降噪优化设计

Optimization design of thin-walled structure with constrained damping layer

针对薄壁结构约束阻尼减振降噪问题,采用耦合有限元和间接边界元的方法对约束阻尼层厚度进行了优化设计。根据声辐射功率与结构表面振动速度之间的关系,选取振动速度的平方和作为目标函数,各层厚度和总质量分别作为设计变量和状态变量,对一块四角固定的矩形约束阻尼板进行优化仿真,并对优化前后的约束阻尼板进行振动和声学响应分析。结果表明,约束阻尼层厚度配置对阻尼减振有确定性定量影响关系,优化后声辐射功率得到明显降低。

Finite element and indirect boundary element methods are used to optimize the design of thickness of each layer to reduce the vibration and acoustic radiation power. Based on the relationship between acoustic radiation power and vibration velocity of the surface of structure, the square of the vibration velocity is selected as objective function, and the thickness of each layer and the total mass of structure as design variable and state variable. A constrained damping plate with four comers fixed has been simulated and optimized. The results shows that the configuration of thickness has a definite and quantitative effect on damping. The optimization makes the vibration velocity and acoustic radiation power reduced significantly.