薄壁板在随机声载荷作用下的振动响应谱估算

针对飞行器薄壁结构声疲劳问题，研究了具有多模态的薄壁板结构在声载荷作用下振动响应谱的估算方法。基于正交模态法，采用结合受纳函数描述结构模态和声场空间压力分布的耦合关系，建立动态响应计算模型。为与试验结果进行对比，选取具有固支边界的金属薄壁板作为研究对象，以试验测得的噪声载荷作输入，计算了该结构的振动响应谱，估算了均方应力，并将计算结果与试验数据进行比较和讨论。

Estimation of Response Power Spectrum of Panel Structure under Random Acoustic Load

As to the sonic fatigue problem of flight vehicle thin panel structure under high-level random acoustic loads,the method for estimation of the response power spectrum of thin panel with multimodes under acoustic load is presented.With the joint acceptance function used to describe coupling effects between structure modes and spatial pressure distribution in sound field,the model for calculating the dynamic response is set up,based on the superposition of orthogonal modes.For comparison with test results,a clamped mental thin panel is considered as a model,and a measured limited frequency bandwidth random acoustic loading is used as an excitation,the response power spectra are calculated.The mean square stresses are estimated as well.The calculated results are discussed.