| 改进的半空间频率均方声压法计算结构频带振动声辐射 |
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| 引用本文： | 高宏林,黎胜,孟春霞.改进的半空间频率均方声压法计算结构频带振动声辐射[J].声学学报,2019,44(1):106-115. |
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| 作者姓名： | 高宏林 黎胜 孟春霞 |
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| 作者单位： | 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; |
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| 基金项目： | 水下测控技术重点实验室延伸性发展基金项目(YS0C261506)资助 |
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| 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。
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| 关 键 词： | 频率均方声压法 半空间 声辐射 失效频率 频带 |
| 收稿时间： | 2017-10-21 |
Improved half-space frequency averaged quadratic pressure method for calculating the pressure radiated from frequency band vibrating bodies in half space |
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| Affiliation: | 1. 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;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240;3. Science and Technology on Underwater Test and Control Laboratory Dalian 116013 |
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| Abstract: | 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 Δf=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. |
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