基于统计能量分析方法的壳体系统振动声辐射特性影响因素研究

Research on the Influencing Factors of Vibro-acoustic Characteristics of Cylindrical Shells Based on Statistical Energy Analysis

统计能量分析方法主要用于结构的高频振动分析。基于统计能量分析方法对壳体系统的高频振动声辐射特性影响因素进行了研究,建立了水下带槽圆柱壳体系统在外力激励下的统计能量计算模型,并给出相关参数的确定方法。着重探讨了壳体本身参数的改变对槽内声腔声压、盖板表面振动以及板外近场流体声场声压的影响。结果表明,被激励壳体长度、厚度和阻尼因子以及材质的改变对上述壳体系统振动声辐射特性影响较大,但壳体厚度和阻尼因子的影响更为明显。在声学结构设计中要综合考虑这些因素的影响。

The statistical energy analysis is mainly used for the analysis of high frequency vibration of structure. The influencing factors of high frequency vibration and acoustic radiation characteristics of cylindrical shell were investigated based on the statistical energy methods. A statistical energy model was established for an underwater cylindrical shell system with the flute excited by external force, and the methods of determining the relevant parameters were given. The effects of the change of shell parameters on the acoustic pressure of acoustic cavity in the flute, the surface vibration of cover plate and the near field acoustic pressure out of the cover plate were discussed. The analysis results show that the material, length, thickness and damping factor of cylindrical shell have the great effects on the above mentioned vibro-acoustic radiation characteristics of cylindrical shell, especially its damping factor and thickness. The influencing factors should be synthetically considered in the design of acoustics structure.