中文摘要：

在粘弹阻尼结构减振设计的研究中,针对阻尼材料与结构参数对阻尼板减振特性的影响,通过对阻尼板的动力学建模与分析,确定模态阻尼比为减振效果评析依据,并推导出阻尼板模态阻尼比计算模型;选定粘弹性阻尼悬臂板为对象,在进行有限元建模和数值分析基础上,仿真了两类阻尼结构在不同材料和尺寸的振动特性参数,分析了阻尼材料弹性模量、损耗因子、约束层与阻尼层的厚度比对结构减振特性的影响。考虑到结构的随机振动,研究了阻尼材料参数及结构参数对减振板宽频振动幅值的影响。进行仿真结果表明,约束阻尼结构比自由阻尼结构抑振效果好并阻尼材料损耗因子越大减振效果越好,为获得理想减振效果应合理配置减振结构的材料及结构参数。

英文摘要：

In order to develop theoretical instructions for vibration suppression,the influence of damping materials＇ mechanics parameters acting on vibration structure is studied. Firstly,by building and analyzing a theoretical dynamic model of damping structure,the modal damping ratio is determined as the evaluating indicator of vibration suppression effect so that the modal damping ratio computational models both for free damping structure and for constrained damping structure based on modal energy are derived. Then,a damping cantilever plank is determined,and by building both free damping layer structure and constraint damping layer finite element numerical models on the plank,the relations between modal damping ratio and both the damping materials＇ elastic modulus and its loss factor,and with addition the thickness configuration of the constraint layer and damping layer as well,are calculated. Finally,considering suppression of random vibration of structure,the random vibration responses of the plank based on different damping materials mechanical property value and different constraint layer and damping layer thickness configuration are simulated. The results show that vibration suppression effect of constrained damping structure is better than free damping structure,and the lager the damping materials loss factor is,the better the vibration suppression will get,while the modulus of the damping layer is better to be 2-3 orders lower than the basic elastic layer.