起降客机噪声源识别的平面阵设计

Planar array design for noise source identifications of flyover aircraft

针对起降客机的噪声源识别,给出了平面多臂对数螺旋阵的设计过程。多臂对数螺旋阵可以在较宽的分析频带内保持较小的主瓣宽度,同时平均旁瓣水平较低,从而具有良好的宽带噪声源识别性能,但其阵型设计中需要考虑的参数较多。本文以ARJ21客机起降过程中的主起落架噪声源识别为例,研究了多臂对数螺旋阵各参数对其噪声源识别性能的影响。所给出的阵列设计流程可以为飞行客机的噪声源识别,尤其是多子阵嵌套的平面阵设计提供参考。

The design of multi-arm logarithmic spiral array （MLSA） for noise source identifications （NSI） of an approaching or taking off aircraft is presented. The MLSA has a small beam width and low side lobe level in a wide frequency band which shows us a good NSI performance. The array geometry of the MLSA is determined by six parameters. We explored their influences on the NSI performance with a MLSA design for the NSI of the main landing gear of ARJ21 in a flyover test. The design process gives a hand to the NSI of the airframe noise, especially for the planar array design with multiple subarrays in aeroacoustic field.