加肋透声窗水动力自噪声的数值/解析混合计算方法研究  

Hybrid numerical analytical method for calculating hydrodynamic self-noise of ribbed acoustic window

作　　者：刘进 王志伟[3] 沈琪 俞孟萨 LIU Jin;WANG Zhi-wei;SHEN Qi;YU Meng-sa(National Key Laboratory on Ship Vibration and Noise,Wuxi 214082,China;China Ship Scientific Research Center,Wuxi 214082,China;Dalian Scientific Test and Control Technology Institute,Dalian 116013,China)

机构地区：[1]船舶振动噪声重点实验室,江苏无锡214082 [2]中国船舶科学研究中心,江苏无锡214082 [3]大连测控技术研究所,辽宁大连116013

出　　处：《船舶力学》2022年第2期282-290,共9页Journal of Ship Mechanics

基　　金：船舶振动噪声重点实验室基金一般项目(6142204190503)。

摘　　要：针对声呐透声窗薄壳加肋结构声学优化设计,将声呐部位简化为弹性矩形板和矩形腔组成的规则模型,采用结构有限元方法求解结构模态振动,并采用近似结构模态函数计算外场Rayleigh积分方程,采用模态解析方法求解声腔内部声场,建立声振耦合方程,进一步考虑湍流边界层脉动压力的时空随机激励特性,形成数值/解析混合的声呐水动力自噪声快速计算方法。以弹性平板为例计算声呐舱的水动力自噪声,并与理论解析法比较,验证本方法的准确性。计算了垂向肋骨的间距对声呐部位水动力自噪声的影响,研究结果表明:在保证声呐透声窗强度要求的前提上,减少垂向肋骨数量,扩大垂向肋骨间距,有利于降低流激水动力自噪声。For the acoustic optimization design of sonar acoustic windows of a ribbed shell structure,the sonar part was simplified into a regular model composed of an elastic rectangular plate and a rectangular cavity.The structural modal vibration was solved by finite element numerical method,the Rayleigh integral equation of the external infinite sound field was solved by approximate structural modal functions,and the internal finite sound field was solved by theoretical analytic method.By establishing a vibro-acoustic equation and considering the characteristics of temporal-spatial random surface excitation,a fast calculation method for the hydrodynamic self-noise of the sonar part was formed based on the hybrid analytical and numerical method.With an elastic plate taken as an example,the hydrodynamic self-noise of the sonar part was calculated and the results were compared with those calculated by the theoretical analysis method,verifying the accuracy of the hybrid method.The calculation results of the influence of vertical ribs’spacing on sonar hydrodynamic self-noise show that enlarging the spacing of ribs can further reduce the hydrodynamic self-noise of the acoustic window under the premise of intensity requirement.

关 键 词：水动力自噪声 薄壳加肋结构 数值/解析混合 

分 类 号：O427.5[理学—声学]