摘要
为探讨板件结构对车内噪声的影响,建立某商务车的白车身有限元模型,分析其模态和车身声灵敏度,确定对汽车低频振动和噪声影响较大的板件;结合变密度法在整车环境下对板件进行减振降噪的拓扑优化,根据拓扑优化结果对板件进行结构修改.优化后的车身声灵敏度曲线与原车身声灵敏度曲线相比,低频范围内的峰值都有不同程度的降低,表明结合整车动态响应的汽车板件结构拓扑优化可以有效降低车内低频振动噪声.
To study the influence of panel structure on car interior noise, a finite element model of bodyin-white of a business car is built, the mode and the acoustic sensitivity are analyzed, and the panels which have bigger influence on the low frequency vibration and noise of the car are determined. With the variable density method, the topology optimization of vibration and noise reduction on the panels is performed under the whole car environment of the car and the structure of the panels are modified according to the optimized results. Compared with the sensitivity curves of the optimized car body and the original one, the peak values in the range of low frequency are decreased in different degree. So it indicates that low frequency vibration and noise can be effectively reduced by topology optimization on car panels combined with the dynamic response of the whole car.
出处
《计算机辅助工程》
2009年第4期15-18,23,共5页
Computer Aided Engineering
基金
国家高技术研究发展计划("八六三"计划)(2007AA04Z132)
关键词
声灵敏度
拓扑优化
变密度法
减振降噪
acoustic sensitivity
topology optimization
variable density method
vibration and noise reduction
