考虑频变特性的约束阻尼结构建模与试验研究

为了提高黏弹性约束阻尼结构模型仿真精度，提出一种考虑频变特性的约束阻尼结构建模方法，并开展了试验验证.首先，对ZN-3黏弹性材料进行动态试验测试，基于最小二乘法获取黏弹性材料模量和损耗因子表达式;其次，根据ZN-3黏弹性材料损耗因子关系表达式，基于考虑频变特性的修正模态应变能法，求解了约束阻尼结构的固有频率和模态损耗因子;最后，以贴敷黏弹性阻尼材料的悬臂约束阻尼薄板为例，从理论与试验两方面校验，结果表明，考虑频变特性的约束阻尼结构有限元模型具有较高精度，与试验测试结果比较误差在5%以内，验证了建模方法的准确性.

Modeling and Experimental Research of Constrained Damping Structure Considering Frequency-Dependent Characteristics

In order to improve the simulation accuracy of viscoelastic constrained damping structure model， a modeling method of constrained damping structure considering frequency-dependent characteristics was proposed and then a test was performed for verification. Firstly， the dynamic test of ZN-3 viscoelastic material was carried out， and the expressions of modulus and loss factor of viscoelastic material were obtained using the least squares method. Secondly， according to the expression of loss factor of ZN-3 viscoelastic material， the natural frequency and modal loss factor of constrained damping structure were solved using the modified modal strain energy method considering frequency-dependent characteristics. Finally， the cantilever constrained damping structure attaching the viscoelastic damping material was chosen and verified from both theory and test， whose results showed that the finite element model considering frequency-dependent characteristics has higher accuracy and the error of model to test is within 5%， which verifies the accuracy of the modeling method.