旋转声场反演
Inversion of spinning sound fields
摘要：
本文提出了一种利用平行于声源轴的边线上的声压测量值重建旋转声源分布的方法。该方法不需要\textit{a priori}假设的源以外，它的强度在感兴趣的频率正弦变化的源盘上的方位角，使辐射声场是由一个单一的圆周模式。当存在多个方位模态时，声场可以分解成方位模态，并且该方法依次应用于每个模态。该方法分两个阶段进行，首先从源分布中找到一个中间线源，然后反演该线源以找到源强度的径向变化。的辐射积分的远场形式的推导，示出的远场压力是一个带限傅里叶变换的线源，建立一个限制的源重建的质量，可以实现使用远场测量。该方法适用于模拟数据表示风洞试验的涵道转子系统（尖端马赫数~0.74）和控制噪声从汽车冷却风扇（尖端马赫数~0.14），研究已经出现在文献中的源识别。
英文摘要：
A method is presented for the reconstruction of rotating monopole source distributions using acoustic pressures measured on a sideline parallel to the source axis. The method requires no \textit{a priori} assumptions about the source other than that its strength at the frequency of interest vary sinusoidally in azimuth on the source disc so that the radiated acoustic field is composed of a single circumferential mode. When multiple azimuthal modes are present, the acoustic field can be decomposed into azimuthal modes and the method applied to each mode in sequence. The method proceeds in two stages, first finding an intermediate line source derived from the source distribution and then inverting this line source to find the radial variation of source strength. A far-field form of the radiation integrals is derived, showing that the far field pressure is a band-limited Fourier transform of the line source, establishing a limit on the quality of source reconstruction which can be achieved using far-field measurements. The method is applied to simulated data representing wind-tunnel testing of a ducted rotor system (tip Mach number~0.74) and to control of noise from an automotive cooling fan (tip Mach number~0.14), studies which have appeared in the literature of source identification.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
