利用航空发动机转子试验器模拟不同部位的碰摩,测试获得碰摩时机匣的加速度响应信号,并与无碰摩时机匣加速度时、频域波形进行对比。测试结果表明,航空发动机叶盘结构的转子—机匣碰摩时,其加速度信号具有冲击、调幅特征,即在碰摩频率及其整数倍频附近存在边频带,其边频宽度为旋转频率。同时,与无碰摩状态相比,在低频段时碰摩特征主要表现为转频及其倍频分量,且倍频分量更加突出。
Using the aeroengine’s rotor-stator testing rig, the rub-impact performance of the rotor-stator system was simulated, and the acceleration signals and the wave forms in frequency domain of the rotor-stator case under rub-impact status were obtained and compared with those without rub-impact phenomenon. The results show that when the rub-impact happens, the acceleration signals have impact and amplitude modulation characteristics, i.e. there exist some sidebands in the vicinity of rubbing frequency and the n-th harmonic frequencies (where n is an integer). In the low frequency range, the rubbing was characterized by the rotation frequency and the n-th harmonic components, and usually these components were more obvious than the former.