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某型发动机在试验中出现了滑油测温探头断裂故障,用模态分析与振动试验相结合的方法,针对测温探头进行了振动模态及结构分析,同时分析了探头所在管路系统的振动特性并进行发动机振动试验。最终得出结论:测温探头的第1阶固有频与管路系统1120Hz的激振频率较接近,导致测温探头产生共振疲劳断裂。最后给出了测温探头的改进设计,装机试验后未出现断裂故障,说明模态分析与振动实验相结合的方法在工程试验中是一种行之有效的排故方法。
In a certain type of engine, the rupture failure of the oil temperature probe occurred during the test. The modal analysis and the vibration test were combined to analyze the vibration mode and structure of the temperature probe. At the same time, the analysis of the pipeline system Vibration characteristics and engine vibration test. Finally, it is concluded that the first-order natural frequency of the temperature probe is closer to the excitation frequency of the 1120-Hz pipeline system, resulting in resonance fatigue fracture of the temperature probe. Finally, an improved design of the temperature probe is presented. After the test, there is no breakage after the test. It is proved that the combination of modal analysis and vibration experiment is an effective troubleshooting method in engineering experiment.