基于模态展开法的水下航行器辐射噪声远场预测方法研究  

A study on sound field prediction of underwater vehicles based on a modal superposition method

作　　者：周思同 帅长庚[1,2] 杨家轩 ZHOU Sitong;SHUAI Changgeng;YANG Jiaxuan(Institute of Noise&Vibration,Naval University of Engineering,Wuhan 430033,China;National Key Lab on Ship Vibration&Noise,Wuhan 430033,China;Unit 92337 of the PLA,Dalian 116023,China;Navy Submarine Academy,Qingdao 266199,China)

机构地区：[1]海军工程大学振动噪声研究所,武汉430033 [2]船舶振动噪声重点实验室,武汉430033 [3]中国人民解放军92337部队,辽宁大连116023 [4]海军潜艇学院,山东青岛266199

出　　处：《振动与冲击》2019年第24期197-202,242,共7页Journal of Vibration and Shock

摘　　要：为了通过圆柱体表面离散声压或振速数据,实现对有限长圆柱壳体的辐射声场预测,提出“基于模态展开法的声场预测”算法。该算法将介质中有限长圆体的径向振动用轴向及周向模态表示,并建立各阶模态与全息面之间的传递函数矩阵,通过匹配全息面声压或振速来确定各阶模态系数;在此基础上,少量远场声压数据进行最小二乘意义下的参数匹配,获取最优的轴向及周向模态阶数,最终实现辐射声场的预测;通过点声源、圆柱体模型及船舶模型的数值仿真及消声室试验,验证了该方法的准确性和有效性。仿真及实验结果表明:与圆柱统计最优近场声全息方法相比,所提出的方法在全息孔径以外不会出现周期性虚像,适用于有限长圆柱体的辐射声场预测。In order to predict the radiation sound field of a finite cylinder through discrete sound pressure or velocity data on a cylindrical surface,a sound field prediction algorithm based on the modal superposition method was proposed.In the method,the radial vibration of the finite cylindrical shell was represented by axial and circumferential modes,and then a transfer function matrix was built between each mode and holographic surface.The modal coefficients were determined by matching the holographic surface sound pressure or vibration velocity.In addition,small amount of far-field sound pressure data was used to perform parameter matching in the sense of least-squares to obtain the optimal axial and circumferential modal order,and finally the prediction of the radiation sound field was realized.Numerical simulations and experiments of point source,cylinder source and ship model were used to demonstrate the validity and applicability of the approach.Results of both the numerical simulations and the anechoic chamber experiment show that compared with the statistically optimized near-field acoustical holography,the proposed technology can realize the sound field prediction outside the holographic aperture,which is suitable for the radiation acoustic field analysis of the finite long cylinder.

关 键 词：声学信号处理 统计最优近场声全息 模态展开法 声场预测 

分 类 号：TB56[交通运输工程—水声工程]