利用声场重构预估声源辐射声功率

Application of acoustic fields reconstruction for sound power prediction

针对中低频声辐射,提出了基于声辐射模态、利用声场重构进行声功率预估的方法.通过声场重构获得声源辐射的整个声压场,基于远场径向积分来计算声功率,推导出了辐射声功率计算公式.以平板声源为例进行仿真验证,讨论影响预估精度的一些因素,分析声场重构法预估声功率的稳定性,并与工程测量法进行对比分析.结果表明,由于声场重构法基于近场测量,能够获得远场足够多的信息,在测点不多的情况下可以达到更高的预估精度,并且具有很好的稳定性.

The acoustic fields reconstruction based on the acoustic radiation modes was used to establish the method for calculating radiated acoustic power at medium and low frequencies. The whole sonic pressure field of radiating acoustic sound source was obtained by means of acoustic fields reconstruction, and acoustic power was calculated based on distant field radial integral. The formula of radiated acoustic power was deduced. Simulation was carried out on panel source as an example. Some factors affecting the accuracy were discussed, the stability of the method was analyzed, and the method of the acoustic field re- construction was compared with the engineering measurement method. The results show that enough rich far-field information can be obtained by acoustic fields reconstruction, which is based on the near field measurements, and the method has enough accuracy with few measuring point and good stability.