用统计能量法分析飞行器声振响应影响因素

基于统计能量分析(SEA)原理,对高超声速飞行器X-43A建立了SEA模型,并合理划分子系统,采用理论及经验公式确定SEA模型的参数.针对结构子系统的内损耗因子以及声腔子系统的吸声系数,讨论了响应灵敏度分析.对平板子系统划分方式和材料厚度对声振响应的影响进行了对比分析.结果表明:飞行器壳体材料结构和阻尼因子以及厚度的改变对壳体声振响应特性影响较大,子结构划分方式对计算精度有较大影响,在声学结构设计中要综合考虑这些因素的影响.

Applications of Statistical Energy Analysis in Influencing Factors Analysis of Aircraft Vibro-acoustic Response Characteristics

The SEA model of hypersonic aircraft X-43A is established based on statistical energy analysis (SEA) theory. Three parameters of the SEA model are established by the theory and experiential formula. According to the damping loss factors of model subsystem and the acoustic absorptivity of cavity, sensitivity analysis of vibro-acoustic response is discussed. The effect of vibro-acoustic response caused by the division way on plate subsystem and material structure are analyzed. The analysis results show that the material structure, damping loss factors and material type have a great effect on the characteristics of vibro-acoustic response. The division way of plate subsystem can affect computational accuracy greatly. The influencing factors should be synthetically considered in the design of acoustics structure.