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以某型飞机前起落架为研究对象,通过气动声学风洞试验研究缓冲支柱及扭力臂组合件的气动噪声产生机制、声源特性和影响因素。根据所得数据绘制了噪声频谱特性曲线。通过改变扭力臂的位置,分析了扭力臂对起落架噪声的影响。试验结果表明:缓冲支柱及扭力臂结构件的气动噪声包含钝体绕流噪声和干扰噪声,主要噪声源为偶极子声源,且噪声场具有一定的指向性;扭力臂在缓冲支柱后时总声压级低于扭力臂在前时的总声压级。试验结果可作为起落架低噪声结构优化设计的基础。
Taking a nose landing gear of a certain type of aircraft as the research object, the aerodynamic noise generation mechanism, sound source characteristics and influencing factors of cushion pillar and torsion arm assembly were studied by aerodynamic acoustic wind tunnel test. Based on the obtained data, the noise spectral characteristics are plotted. By changing the position of the torsion arm, the influence of the torsion arm on the landing gear noise is analyzed. The experimental results show that the aerodynamic noise of the buoyant pillar and the torsional arm structure includes bluff body flow noise and interference noise. The main noise source is the dipole sound source, and the noise field has a certain directivity. When the torsional arm is behind the cushion pillar The total sound pressure level is lower than the total sound pressure level of the torsion arm in the front. The test results can be used as the basis for the optimization design of landing gear low noise structure.