基于混合FE-SEA方法的加筋板宽频隔声预计

目的预测有限尺寸加筋平板结构宽频范围内的隔声特性,指导飞行器结构声学设计。方法基于混合FE-SEA方法,对单向加筋平板结构开展宽频隔声预计。同时,在标准声学试验室对其进行隔声测试,并将FE-SEA法预计结果与测试结果、SEA方法计算结果进行对比分析。结果与SEA法相比,混合FE-SEA方法在50 Hz~10 kHz频带内的预计结果与试验结果更为吻合,其更适用于宽频隔声预计;在400 Hz~10 kHz的中高频段内,FE-SEA方法预计结果与试验结果基本相同;在50 Hz~400 Hz的低频段内,FE-SEA方法预计结果略高于试验结果,且随频率降低,偏差会逐渐增大。结论进行加筋板结构声学设计时,为了获得精确的宽频隔声预计结果,可首先选用FE-SEA方法。FE-SEA方法预计结果在中高频段可直接使用,在低频段仅能作为参考,使用时应当进行修正。

Prediction of Broadband Sound Insulation of Stiffened Panels Based on Hybrid FE-SEA Method

This paper aims to predict the broadband sound insulation characteristics of finite size stiffened plates and guide the acoustic design of the aircraft. The hybrid FE-SEA method is used to predict the acoustic characteristics of unidirectional stiffened plate structures. At the same time, the sound insulation test is carried out in a standard acoustic laboratory. Then, the predicted results of FE-SEA are compared with the test results and SEA calculation results. The results show that, I) compared with the SEA method, the predicted results of the FE-SEA method are more consistent with the experimental results in 50 Hz~10 kHz; II) the predicted results of the FE-SEA method are basically the same as the experimental results in the middle and high-frequency band (400 Hz~10 KHz); III) the predicted results of FE-SEA method are higher than the measured results in the low-frequency band (50 Hz~400 Hz), the lower the frequency, the greater the deviation. In the acoustic design of stiffened plates, the FE-SEA method should be preferred in order to obtain high-precision broadband sound insulation prediction results. The predicted results of the FE-SEA method can be used directly in the medium-frequency band and high-frequency band, and can only be used as a reference in the low-frequency band, Which should be corrected if it was used.