基于统计能量法的飞行器结构声振响应分析

Analysis of Vibro-acoustic Response of Aircrafts Based on Statistical Energy Method

基于统计能量分析(SEA)原理,对高超声速飞行器X-43A建立SEA模型,采用理论、经验公式及试验数据确定SEA模型的三个参数。将数值模拟计算结果与噪声试验值进行对比,结构声振响应的统计能量分析与试验结果趋势上较为一致,但低频段二者差异较大,高频段较为吻合;结构舱内响应噪声声压的计算值与试验测量值相比,不论在高频还是中低频,二者都较为一致,误差约3 dB,说明统计能量分析法对振动噪声环境预测是比较可靠的。

The model of hypersonic aircraft X-43A is established based on statistical energy analysis （SEA） theory. Three parameters of the SEA model are determined by using the theory, imperial formula and experimental data. The results of structural acoustic response from SEA simulation and test agree well in high frequency range, while there is some difference between them in the low-frequency range. Results of sound pressure response inside the aircraft cabin of the simulation and test agree well in both high frequency range and medium-low frequency range. The difference between them is less than 3 dB. It shows that the method of statistical energy analysis is reliable in prediction of vibration and noise of environment.