飞机典型运行状态声源识别及其声功率估计OA

Identifying the main sound sources under typical aircraft operating status and estimating their radiated sound power are of great significance for aircraft low-noise design and noise pollution assessment.In this study,a beamforming algorithm is employed to develop a method that utilizes a sound array to identify the external main airframe sound sources and estimate their radiated sound power levels during both aircraft ground operation and low-altitude flight.Additionally,a method for analyzing the contribution of these main sound sources is proposed.A flight test technical plan is then presented,which centers around the measurement of sound-aircraft-environment parameters.The proposed methods are validated through a series of sound tests conducted on a fighter plane and a large transport aircraft,utilizing a well-designed non-uniform linear acoustic array and a planar multi-arm spiral acoustic array.The results demonstrate the efficacy of the proposed methods in accurately identifying the main sound sources within the frequency range of 200-2 000 Hz,as well as estimating the radiated sound power levels of the aircraft engine and airframe sound sources,thereby enabling the determination of their respective contributions to the overall sound power.