基于FE-SEA混合法的飞行器结构声振响应分析与试验验证

Vibro-acoustic Response Analysis of Aircraft Structure Based on Hybrid FE-SEA and Experimental Verification

以美国X-43A飞行器为研究对象,基于有限元与统计能量分析混合法FE-SEA,建立飞行器结构声振耦合动力学模型,着重研究飞行器噪声致振的性质及规律,得到飞行器空腔结构在宽频外噪声场激励下的结构振动响应及舱内噪声场响应,并对FE-SEA在宽频区间中段的计算结果进行分析.通过噪声试验验证了理论与数值计算的可靠性.

For structural vibro-acoustic coupling methods,a general accepted view is that the Finite Element(FE) method is suitable in low-frequency band,and Statistical Energy Analysis(SEA)methods is more appropriate in high-frequency band.However,there are no suitable methods for the medium-frequency band.Moreover,in different engineering fields,the division of high- mediumand low-frequency band is also different.The vibro-acoustic coupling dynamics of hybrid FE-SEA model of the hypersonic aircraft X-43A is established based on FE-SEA theory.In order to study the performance and property of vibration caused by aerodynamic noise,the external noise field is assumed as known.The noise transmission and structure coupling vibration are analyzed by hybrid FE-SEA method.Structural vibration response and the noise field response of the aircraft model are obtained.Finally,reliability of the theory and numerical calculation is verified through noise experiments.