基于能量有限元方法的声腔内部噪声预测

为了预测声腔内部噪声,基于能量有限元方法(EFEA)建立了声腔-平板-声腔的EFEA耦合模型,对声腔内部噪声进行了数值计算。建立了声腔-平板-声腔的统计能量分析(SEA)模型,并将EFEA模型的预测结果与SEA模型的预测结果进行了对比。结果表明,二者具有较好的一致性。建立了声腔-前风挡玻璃-声腔的EFEA耦合模型和SEA耦合模型,分别对EFEA和SEA模型的外侧声腔响应进行了仿真分析,并与试验结果进行了对比。结果表明,EFEA预测结果与SEA预测结果以及试验结果均吻合良好,充分显示了本文所建立的声腔-前风挡玻璃-声腔EFEA模型对声腔内部噪声预测的准确性。

Prediction of cavity interior noise based on energy finite element method

In order to predict the interior noise of the cavity,the basic principle of energy finite element method(EFEM) was introduced.A coupled cavity-plate-cavity energy finite element analysis(EFEA) model was built,and its interior noise was computed with numerical method.Meanwhile,a statistical energy analysis(SEA) model of cavity-plate-cavity was also built.The prediction result of the EFEA model was compared with the result of the SEA model.The result showed that they were in accordance with each other.Moreover,an EFEA model and a SEA model of cavity-front windshield-cavity were built.The responses of the outer cavities in EFEA and SEA models were respectively calculated,and the response results were compared with test.The comparison results showed that the prediction result of EFEA model was in accordance with that of SEA and test,and the prediction accuracy was also validated.