高频噪声场中薄壁结构响应的预估

 本文用统计能量分析(StatisticalEnergyAnalysis简称SEA)法研究了在高频宽带随机噪声场中板及加筋板(航空航天器用蒙皮)的加速度响应。发现,在高频段同样外场激励情况下,加筋板的响应大于光板的。本文解释了这一用质量定理无法解释的现象,并用叠加法确定了复杂结构加筋板的模态密度、辐射阻抗和输入功率。

PREDICTING THE RESPONSE OF SHELL STRUCTURE IN THE HIGH-FREQUENCY NOISE FIELD

The acceleration response of the panel and the ribbed panel (skin of aircraft) exited by the band high-frequency random noise field is discussed by .using the method of statistical energy analysis (SEA). It is discovered that the response of ribbed panel is larger than the panel under the same sound load in high-frequency. In this paper, based on the energy balance equation of the panel and ribbed panel, the phenomenon which can not be explained by mass law is explained. Furthermore, the central reasons which cause this phenomenon are analysed. As the rib is increased, the stiffness and the radiation resistance of the panel are increased. Therefore, in high-frequency the number of resonance modes to the ribbed panel is greater than the panel, the average energy of the vibration and the response are also greated. The modal density, radiation resistance and input power for the ribbed panel are obtained by the superposition principle.