基于声辐射模态讨论声能量辐射与传递
Discussion about radiation and transfer of acoustic energy by radiation modes
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摘要: 声辐射模态表示了振动声源表面的辐射模式。基于声辐射模态讨论了振动声源表面声能量辐射和声场中声能量传递的性质,给出声能量辐射和传递的模式。采用表面声强描述振动声源表面的声能量辐射,采用声强描述声能量在声场中的传递。表面声强和声强可分解成两部分,一部分将辐射的声能量传递到远场;另一部分表现为振动声源与声场之间的能量交换。针对矩形板分析了声能量辐射和传递,数值计算结果与理论结果一致。结果表明基于声辐射模态讨论声能量辐射与传递是可行的和有效的。Abstract: The acoustic radiation modes express the radiation patterns of a vibrating surface. Based on the acoustic radiation modes, the properties of acoustic energy radiation from a vibrating surface and acoustic energy transfer in the acoustic field are discussed, and the patterns of acoustic energy radiation and transfer are given. The surface sound intensity is used to describe the acoustic energy radiation from a vibrating surface and the sound intensity is used to describe the acoustic energy transfer in the acoustic field. The surface sound intensity and the sound intensity can be divided into tow parts. One part makes contribution to the acoustic power and transfers the acoustic energy into the far field. The other part describes an exchange between the vibrating surface and the near field. For a rectangular plate, the radiation and transfer of acoustic energy are studied and the numerical results agree with the theoretic results. It has been shown that the approach for acoustic energy radiation and transfer based on the acoustic radiation modes is available.