不确定参数对约束阻尼板振动特性的影响分析  

Analysis of Influence of Uncertain Parameters on Vibration Performance of Constrained Layer Damping Plate

作　　者：陈静月 Chen Jingyue(School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学机械工程学院,上海市200093

出　　处：《农业装备与车辆工程》2021年第5期90-94,共5页Agricultural Equipment & Vehicle Engineering

摘　　要：约束阻尼技术应用于车身等板件的减振降噪设计时,几何参数和材料参数不确定性使其减振降噪性能产生波动的问题。将车身板件抽象为平板结构,采用直接蒙特卡洛方法,分析了几何参数和物理参数不确定性对其结构振动性能的影响。考虑粘弹性材料的频变依赖特性,采用迭代法求解模态参数。基于概率模型描述约束阻尼材料的几何和材料参数不确定性,采用直接蒙特卡洛法评估模态固有频率和阻尼比的波动情况。结果表明,约束层本构参数和厚度不确定对阻尼比的影响最大。Constrained damping technology is widely used in vibration and noise reduction of body panels and other plates,but the inevitable uncertainty of geometric parameters and material parameters will make its performance fluctuant.The body panel is abstracted as a plate structure,and the direct Monte Carlo method is employed to analyze the influence of the uncertainties on the structural vibration performance.Considering the frequency dependence of viscoelastic materials,the iterative method is employed to solve the modal parameters.The geometric and material uncertainties of constrained damping materials are described as random variable,and the direct Monte Carlo method is employed to evaluate the variability of modal frequency and damping ratio.The results show that the two critical parameters for the damping ratio are the constitutive parameters and thickness of the constrained layer.

关 键 词：车身板件 振动特性 蒙特卡洛方法 不确定传播 迭代法 

分 类 号：U461.4[机械工程—车辆工程]