摘要
基于材料优化的车内降噪和减振方法主要是通过提高阻尼材料的使用效率和铺设阻尼材料,减少车身接触点间的摩擦和碰撞。本文基于用DMA动态粘弹谱分析仪测出原车阻尼材料和几种不同黏弹性阻尼材料的损耗因子随温度和频率变化的关系。采用原车阻尼材料和一种损耗因子比较大的(Dy-1)阻尼材料在相同环境下进行车内噪声频谱试验测试,得到了降噪能力更强的抗振材料。同时基于有限元理论,通过拓扑优化方法和综合应变能方法对车身地板阻尼材料的布置位置进行优化。利用拓扑优化方法对车身地板第10阶模态下的损耗因子进行了优化,在使用了60%阻尼材料情况下,获得了和全铺阻尼接近的损耗因子。利用综合应变能方法,使用了全铺时40%的阻尼材料,得到了和全铺时接近的减振效果。
The method of noise and vibration reduction inside the car is mainly to lay damping materials and raise their damping efficiency based on the optimization of materials to reduce the friction and collision between the contact surfaces of components.In this paper,the relationships of loss factors of different viscoelastic-damping materials with temperature and frequency were measured based on the DMA dynamic viscoelastic spectrum test.Through the internal noise frequency spectrum tests for the damping material of original car and the other damping material with high loss factor（Dy-1）in the same environment condition,an anti-vibration material with stronger noise reduction capability was obtained.At the same time,based on the finite element theory,the layout of the damping material on the floor of the vehicle’s body is optimized by the topological optimization method and the integrated strain energy method.The topological optimization method was also used to optimize the loss factor under the 10th mode of the body floor.It was found that when the laying of the damping material reaches 60%,the loss factor is close to that of the full damping material laying.By using the integrated strain energy method,when the laying of the damping material reaches 40%,the damping effect is close to that of the full damping material laying.
作者
张若平
王以鹏
ZHANG Ruoping;WANG Yipeng(Automotive Engineering College, Shanghai University of Engineering Science, Shanghai 201620, China)
出处
《噪声与振动控制》
CSCD
2018年第A01期254-258,共5页
Noise and Vibration Control
关键词
振动与波
车身地板
黏弹性阻尼材料
损耗因子
拓扑优化
综合模态应变能
vibration and wave
body floor
viscoelastic damping material
loss factor
topological optimization
integrated modal strain energy
