某型飞机起落架结构件气动噪声仿真与试验研究

起落架噪声是飞机着陆阶段噪声的主要组成部分。以某型飞机前起落架为研究对象，通过分离涡模拟方法对其支柱及扭力臂结构件简化模型的周围流场进行非定常计算，利用Fw—H方程积分法对各部件表面产生的声场进行求解，分析缓冲支柱及扭力臂结构件气动噪声的产生机制、声源特性。对该飞机起落架支柱及扭力臂结构件进行声学风洞试验，通过麦克风对噪声的测量获得结构件噪声频谱特性。仿真及试验结果均表明：支柱及扭力臂结构件气动噪声包含支柱和扭力臂引起的钝体扰流噪声和两者相对位置引起的干扰噪声，支柱噪声对总噪声的贡献大于扭力臂噪声，噪声辐射特性具有偶极子声源的辐射特性。

Simulation and Experiment Study on Aero-acoustic Noise of an Aircraft's Landing Gear Structure

Aircrafts＇ noise produced by landing gears is the main noise in the landing stage. Simulation analysis using Detached Eddy Simulation is performed to simulate the flow field around the simplified structure including the strut and torque link of an aircraft＇s nose landing gear. The acoustic field radiated from different model parts and total model are calculated via FW-H equation. The noise mechanism and acoustic characteristics of the noise from the structure are analyzed. Wind tunnel test is performed to measure the noise spectra of the structure by microphones. The simulation and experiment results show that the noise of the assembly of strut and torque link include bluff body and interaction noise. Noise from the strut has greater contribution to total noise than that from the torque link. The whole model noise radiation direetivity is similar to the dipole characteristics.