基于动态响应分析的汽车车身NVH性能优化控制  

Optimization control of car Body NVH performance based on dynamic response analysis

作　　者：曹友强[1] 邓兆祥[1] 张宇[1] 陈德欣[1] 

机构地区：[1]汽车噪声振动和安全技术国家重点实验室,重庆400039

出　　处：《高技术通讯》2013年第8期868-874,共7页Chinese High Technology Letters

基　　金：国家973计划(2010CB736104);国家863计划(2012AA111803)资助项目

摘　　要：以控制车身结构低频NVH特性为目标,进行了某轿车车身NVH特性的动态分析及其优化控制.建立了含门窗的整车结构模型、车内声场模型以及结构-声场耦合模型,采用声固耦合有限元法计算了耦合系统在发动机和路面激励下的车内声学动态响应.建立了车身面板声学贡献分析模型,研究了共振峰值下车身面板对车内声学环境的影响度.定义影响显著的车身面板为优化域,以车身板件动力响应最小为目标函数进行了车身结构低频NVH特性动态优化设计,并对设计的效果进行了计算评价.结果表明,结构优化设计后,车内声压响应得到明显改善,共振转速下测点的总声级降低了约3～10 dB（A）.For the goal of controlling low-frequency NVH characteristics of body structure,NVH performance dynamic analysis and optimization control for car body was carried out.The model of body structure including doors and windows,the sound field model and the structure-sound field coupling model were established.The car interior acoustic response of the coupling system affected by the engine driveand road excitation was calculated based on the soundsolid coupling finite element method.A panel acoustic contribution analysis model of car body was established,and the body pane influence degrees for the acoustic environment under the resonance peak were researched.Then the car body panel with significant influence was defined as the optimize domain.Under the objective function with body dynamic response minimum,the dynamic optimization design of low-frequency NVH characteristic for body structure was done,and the design effect was calculated and evaluated.The results showed that interior sound pressure response was obviously improved after structure optimization design.And the total sound level of measuring point for the resonance speed was reduced about 3 ～ 10 dB （A）.

关 键 词：车身NVH 声固耦合 声学响应 动态优化 

分 类 号：U463.82[机械工程—车辆工程]