水下航行体表面湍流脉动压力波数−频率谱测试应用分析  

Application analysis on the wavenumber-frequency spectrum of pressure excited by a turbulent boundary layer on the wall of an underwater test vehicle

作　　者：吕世金[1,2] 高岩 刘进[1,2] 沈琪 LYU Shijin;GAO Yan;LIU Jin;SHEN Qi(China Ship Science Research Center,Wuxi 214082,China;National Key Laboratory on Ship Vibration&Noise,Wuxi 214082,China)

机构地区：[1]中国船舶科学研究中心,江苏无锡214082 [2]船舶振动噪声重点实验室,江苏无锡214082

出　　处：《中国舰船研究》2020年第S01期55-60,共6页Chinese Journal of Ship Research

摘　　要：[目的]分析不同模型表面流动激励力的相关性测试结果在流激振动声辐射中的应用。[方法]利用湍流脉动的压力波数−频率谱计算流激平板声辐射模型,建立水下航行体湍流脉动压力波数−频率谱测试应用方法,并将测量结果与经典模型计算结果进行比较。[结果]结果显示,平板模型的湍流脉动压力波数−频率谱测量结果与经典模型计算结果比较一致,偏差小于3 dB;在环频以上频段,回转体模型可近似为平板,其表面湍流脉动压力波数−频率谱测试结果与平板模型的差别很小,偏差小于3 dB;在环频以下频段,采用平板模型的激励力测试结果计算回转体的流激振动声辐射会带来较大的偏差。[结论]试验与分析结果可为水下航行体流动激励力测试应用提供理论基础。[Objectives]This paper analyzes the application of sound radiation by fluid-exciting force in correlation with the measurements of different models.[Methods]The wavenumber-frequency spectrum of turbulent pressure fluctuations is exploited to calculate fluid-exciting sound radiation of plate model.Thereby,we propose a test method of applying wavenumber-frequency spectrum of turbulent pressure fluctuations to the underwater vehicle,and comparing the differences in measurements with the classic model.[Results]The results show that,the measurements of the wavenumber-frequency spectrum of turbulent pressure fluctuations of the plate model are relatively consistent with those of the classic model,with a deviation of less than 3 dB.In the band above ring frequency,the model of revolution body can be approximated as plate model,the measurement of wavenumber-frequency spectrum of turbulent pressure fluctuations varies slightly in contrast to the plate model,with a deviation of less than 3 dB.In the band below ring frequency,if test data of excitation force obtained by the plate model are used to calculate the fluid-exciting sound radiation,it will yield a higher deviation.[Conclusions]The experiment and analysis results provide a theoretic foundation to use the test data of pressure excited by a turbulent boundary layer on the wall of underwater vehicle.

关 键 词：水下航行体 湍流脉动压力 波数−频率谱 测试 

分 类 号：U661.44[交通运输工程—船舶及航道工程]