改进的半空间频率均方声压法计算结构频带振动声辐射  

Improved half-space frequency averaged quadratic pressure method for calculating the pressure radiated from frequency band vibrating bodies in half space

作　　者：高宏林 黎胜[1,2] 孟春霞 GAO Honglin;LI Sheng;MENG Chunxia(State Key Laboratory of Structural Analysis for Industrial Equipment,School of Naval Architecture Faculty of Vehicle Engineering and Mechanics,Dalian University of Technology Dalian 116024;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240;Seience and Technology on Underwater Test and Gontrol Laboratory Dalian 116013)

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室运载工程与力学学部船舶工程学院,大连116024 [2]高新船舶与深海开发装备协同创新中心,上海200240 [3]水下测控技术重点实验室,大连116013

出　　处：《声学学报》2019年第1期106-115,共10页Acta Acustica

基　　金：水下测控技术重点实验室延伸性发展基金项目(YS0C261506)资助

摘　　要：为计算中高频半空间结构频带振动下声辐射问题,推导了基于能量源的半空间频率均方声压法(Frequency Averaged Quadratic Pressure, FAQP),并提出了改进的半空间FAQP法,克服了半空间FAQP法在失效频率下解不唯一的问题。频率带宽为4 Hz的刚性壁面作用下的脉动球和与自由表面相接触的脉动半球的声辐射数值计算,验证了改进的半空间FAQP法对解决失效频率下解不唯一问题的有效性。同时,刚性壁面作用下的脉动球和与自由表面相接触的脉动半球声辐射数值计算结果均表明,在1/3倍频程下,改进的半空间FAQP法与常规边界元方法相比,具有更高的计算精度,更适用于中高频计算。In order to calculate the acoustic radiation from frequency band vibrating bodies in half space, we propose the improved half-space FAQP(Frequency Averaged Quadratic Pressure) method based on energy sources to calculate the pressure radiated from frequency band vibrating bodies and obtain a unique solution for radiation at irregular frequencies. Numerical results of a pulsating sphere under a rigid surface and a pulsating hemisphere sitting on a free surface with bandwidth △f = 4 Hz show that the validity of the improved half-space FAQP method for solving the non-uniqueness problem is verified. And numerical results of a pulsating sphere under a rigid surface and a pulsating hemisphere sitting on a free surface show that, compared with the conventional BEM, improved half-space FAQP method can have much higher accuracy and is more suitable for high frequency calculation.

关 键 词：振动声辐射 空间频率 声压法 计算结构 频带 数值计算 刚性壁面 边界元方法 

分 类 号：TB53[理学—物理]