不同温度下带阻尼薄板件振动模态实验与仿真

Experimental and Simulation Studies on Vibration Modes of Damping Treated Thin Plate at Different Temperatures

摘要:

为分析带阻尼薄板件在不同温度下的振动模态特性，使用改制的环境箱和激光测振技术对板件进行模态参数识别，实验分析温度对带阻尼薄板件的模态频率和模态阻尼的影响规律。结果表明，温度跟带阻尼薄板件的模态频率呈负相关，在极端高温和低温情况下，模态阻尼大幅降低。提出基于优化算法的阻尼材料参数倒推识别方法，识别出阻尼材料随温度和频率变化的复模量和损耗因子，用于有限元仿真验证。仿真结果表明，使用频变的阻尼材料参数预测带阻尼薄板件的振动响应，其共振频率和响应幅值更接近测试值。

Abstract:

A modified environment chamber and a laser vibration meter were used to identify the modal parameters of damping treated thin plate at different temperatures. An experimental analysis was conducted to analyze the influence of temperature on the modal frequency and modal damping ratio. The results show that the temperature is negatively correlated to the modal frequency of damped thin plate， the modal damping is greatly reduced at extremely high and low temperatures. An inverse identification method based on optimization algorithm was proposed to identify the material properties of damping material. The variation of complex modulus and loss factor of damping material with temperature and frequency were identified for further verification by finite element method. The simulation results show that the resonant frequencies and response amplitude are better correlated to the measured values， by using the temperature and frequency dependent parameters to predict the vibration response of damping treated thin plate.