上海交通大学 海洋工程国家重点实验室; 高新船舶与深海开发装备协同创新中心， 上海 200240
出版日期:2019-02-28发布日期:2019-02-28通讯作者:杨德庆，男，教授，博士生导师， E-mail: yangdq@sjtu.edu.cn.作者简介:李清(1993-），男，江苏省镇江市人，博士生，研究方向为船舶声学计算方法与优化设计， E-mail: liqing5504@sjtu.edu.cn.基金资助:国家自然科学基金资助项目（51479115），海洋工程重点实验室开放课题（GKZD010071），高新技术船舶研究项目(科军评［2014］148，联装函［2016］548)Coupled Sound Field Calculating Method for Ship Underwater Noise Excited by Multiple Categories of Vibration and Sound Sources
LI Qing,YU Han,YANG DeqingState Key Laboratory of Ocean Engineering； Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China
Online:2019-02-28Published:2019-02-28摘要/Abstract
摘要： 针对具有DTMB 5415船型的某护卫舰，提出水动力、机械和螺旋桨等3类典型振动噪声源共同作用下舰船低中频水下噪声的耦合声场计算方法.基于URANS方法采用SST k-ω湍流模型，数值模拟了该舰在某航速下的非定常流场，并将其作为该舰的水动力噪声源；以某型螺旋桨的脉动压力与实测噪声数据作为机械振动源和螺旋桨噪声源.建立了该舰结构有限元-流体声学间接边界元(FEM-IBEM)声振耦合计算模型，以船体结构前 40000 阶干模态作为声振耦合求解声学响应的模态基，计算了该舰在上述3类噪声源共同作用下0~500Hz水下辐射声功率级，分析了各类噪声源辐射噪声的指向特性和频谱特性.比较了工程中常用的各噪声源辐射声级直接线性叠加方法与耦合声场计算方法的差异.研究表明，耦合声场计算方法的计算效率和精度更高，是多类振动噪声源激励下舰船低中频水下辐射噪声预报的优选数值计算方法.
关键词: 舰船水下噪声, 水动力噪声, 机械噪声, 螺旋桨噪声, 耦合声场, 声功率
Abstract: Aiming at a frigate model based on the DTMB 5415 hull form, a coupled sound field calculating method for ship underwater radiation noise in low-middle frequencies was discussed by considering three typical categories of vibration and sound sources, mechanical, propeller and hydraulic noise. A vibroacoustic coupling FEM-IBEM (the finite element method-indirect boundary element method) model for the frigate was established, and the front 40000 order modes were calculated as the modal basis for the acoustic response. This study then calculated the acoustic radiated power level in 0-500Hz and analyzed directional properties and spectral characteristics for every noise component, and it compared the differences between the direct superposition and the coupled sound field calculating methods. The research shows that the physical model of the coupled method is more exact and efficient, and it is a preferred method for ship underwater radiation noise numerical prediction in low-middle frequencies excited by multiple categories of vibration and sound sources.
Key words: ship underwater noise, hydraulic noise, mechanical noise, propeller noise, coupling acoustic fields, sound power
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