基于声能量传递分析的空腔阻隔结构布置方案设计

Optimal design of vehicle cavity fillers' arrangement based on flow of acoustic power

基于统计能量分析原理,建立整车SEA模型,并简化出汽车侧围空腔模型,进行激励源至舱内声腔的声能量传递分析。根据声能量传递分析得到的主要激励源、主要泄漏段以及主要传递路径三方面结果,制定阻隔结构的布置方案,并在整车模型中添加空腔阻隔结构进行降噪效果预测。结果表明,该方案使用较少的阻隔结构达到了甚至稍高于原厂方案的降噪效果。

Based on the principl es of the statistical energy analysis （ SEA）,a whole-body model for a vehicle wasconstructed here. From the model,a side-l3〇 dy model was built and simplified to analexcitation sources to the acoustic cavity inside the car’s passenger compartment. According to main excitations,major leaking positions and main paths of acoustic power flow,three different arrangements of cavityfillers were made. Cavity fillers were put into the whole-body model,the noise attenuation effects of cavity fillers in threearrangements were predicted,respectively. Through comparing three results,the optimal arrangement was obtained. Thestudy results showed that the optimal arrangement with less cavity fillers has a better denoarrangement does.