摘要
鉴于板件结构声辐射数值仿真研究中,有限元法和边界元法不适用于中、高频段的问题,采用统计能量分析方法将某汽车前围板的有限元模型划分成22个子系统,通过理论计算与试验相结合的方法获得了子系统模态密度、内损耗因子和耦合损耗因子等统计能量分析基本参数。同时,计算了前围板的声传递损失,并与相应的性能试验结果对比,从而使该模型可用于后续计算并保证声学优化的可靠性。最后,将原模型的单层镁板改为多层复合板,不仅降低了前围板的质量与成本,而且改善了驾驶室的声学环境。
In view of the problem that finite element and boundary element analyses are not suitable for medium and high frequency range in numerical simulation on structure-borne sound radiation,statistical energy analysis（ SEA） method is adopted and accordingly the finite element model for front bulkhead is divided into 22 SEA subsystems with their basic SEA parameters,including modal density,damping loss factor and coupling loss factor acquired by the combination of theoretical calculations and tests. In addition,the sound transmission loss of bulkhead is calculated and compared with relevant test results to make the model can be used in subsequent calculation and ensure the reliability of acoustic optimization. Finally the magnesium plate in original model is replaced by multilayer composite plate,not only reducing the mass and cost of bulkhead but also improving the acoustic environment of driver cabin.
出处
《汽车工程》
EI
CSCD
北大核心
2014年第8期1004-1008,1013,共6页
Automotive Engineering
基金
国际科技合作项目(2007DFB50150-2)资助
