基于麦克风阵列测量的机翼脱落涡噪声研究

摘要

During Qiao Weiyang′s 18 month stay at DLR working on a CAE (Chinese Aeronautical Establishment)/DLR Cooperation project, we measured and discovered shedding vortex noise. Using DLR's large planar microphone array consisting of 111 microphones, we studied the two dimensional mapping of sound sources on landing aircraft. We first discovered a new noise source, shedding vortex noise source, located on the wing somewhat near to wing tip than to wing root (Fig.4b). The spectrum of this noise is typically tone spectral. The frequency of this noise source increases with increasing aircraft airspeed. With this noise source as center we imagine a circle touching the ground; the noise sound pressure level becomes higher and higher as we move along the circle in the direction of flight; when the emission angle changes from 60° to 120°, the noise sound pressure level increases by about 5～8 dB.%应用由111个麦克风组成的平面麦克风阵列对当前流行的民用客机进场着陆过程中的飞机噪声源进行了测量分析，在国际上首次发现了机翼脱落涡单音噪声源，并且得到了这种噪声源的频谱特性、指向特性和声级变化特征。