多种激励条件下复杂圆柱结构的中频声辐射预测及验证

利用混合有限元-统计能量分析法,研究不同激励条件下复杂圆柱结构的声辐射特性.构建了一种空中及水下航行器的典型结构——复杂圆柱结构.在半消声室中测量了圆柱结构腔内声压级水平.结果表明:在不同激励条件下,该方法预测的复杂圆柱结构在中频段的声压值与实验测量结果比较吻合,能够较准确反应各个频率段及拐点处的声辐射情况.预测误差随激励的类型及频率的改变存在一定差异,其中声-力混合激励下预测误差最小.随着频率的增加预测精度越来越高.

The acoustic radiation prediction and validation of complex cylindrical structure in muliti-excitation medium-frequency region

The finite element-statistical energy analysis(FE-SEA) model of the complex cylindrical structure iss built which is often used in aircraft or submarine.The characteristics of acoustic radiation is studied based on hybrid FE-SEA method under multi-forced.The sound pressure level in the sound cavity of cylindrical structure is measured in the anechoic room under the multi-excitation,and the tested results are compared with the simulated ones.It shows that the simulated results are in good agreement with the experimental ones in the interest medium-frequencies.It can provide an accurate calculation of acoustic radiation on each frequency region and the inflection.The higher the frequencies are,the more accurate the prediction results are.There are some differences in the prediction with the change of excitation type and frequency,of which the error of the sound-force hybrid excitation is the smallest.