考虑频变特性的约束阻尼结构建模与试验研究

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

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.

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.