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针对某型弹用涡扇发动机振动超标问题,建立了一维有限元梁模型进行仿真与模拟,结合实际试车数据进行了故障分析和仿真,验证了故障原因在于工作转速内存在临界转速,在较大的不平衡力作用下,松动故障被激发。针对机匣加速度信号,研究了不对称刚度模型下松动故障的冲击特征,发现了松动故障所引发的机匣加速度时域波形特征的不对称性以及频谱中出现倍频特征,与实际弹用涡扇发动机试车数据非常一致。结果表明:振动故障是由于支承刚度不足,导致在临界转速附近出现松动故障。
Aimed at the problem of excessive vibration of a certain type of turbofan engine, a one-dimensional finite element beam model was established to simulate and simulate. Based on the actual test data, the fault analysis and simulation were carried out. The reason of failure was verified by the existence of critical speed in the working speed. Large unbalanced force, loosening fault is excited. According to the casing acceleration signal, the impact characteristics of loose faults under asymmetric stiffness model are studied. The asymmetry of the time-domain waveform characteristics of the casing acceleration induced by the loose fault and the frequency doubling feature in the spectrum are found. Fan engine test data is very consistent. The results show that the vibration fault is caused by the lack of support stiffness, resulting in the occurrence of loose failure near the critical speed.