边界元法在汽车室内噪声建模中的应用

Application of boundary element method in the interior noise modeling

为探讨汽车室内噪声建模的方法，应用边界元法描述汽车车身室内的噪声水平。首先基于Hypermesh有限元软件建立汽车车室空腔有限元模型，然后以NASTRAN的格式导入到SYSNOISE环境中构建单区域边界元计算模型。引进车内座椅吸音材料对室内声场的影响，重新构建包含座椅的汽车室内多区域边界元计算模型。通过在车身室内安置一个点声源进行激励，分别采用单一和多区域边界元法模拟车身室内声场响应，获得在频率0—1000Hz范围内车身室内声场的频响函数。经试验验证，通过对比分析可知多区域边界元法计算结论与试验结果较好吻合，这表明多区域法比单区域法具有更高的精度。

The application of the ented in order to discuss the modeling boundary element method （BEM） for describing the noise behavior was presmethod in the interior of an automobile. The cabin response was simulated by using a point source located in the cabin as well as by prescribing the normal surface velocity of the cabin boundary surfaces. The BEM calculation included the effect of the absorbing material of the seats, in which single domain and multidomain approaches were used. It was shown that multidomain approach yielded more accurate results than the single domain approach as expected. Test cases were presented involving a prismatic cabin and a real automobile cabin. Measurement was conducted for the real automobile cabin and it shows a good agreement with the BEM results. It was shown that muhidomain BEM method has more precision than single domain BEM method.