CAJ | 학술논문

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1120 Hz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。
모형발동궤재시험중출현료활유측온탐두단렬고장，용모태분석여진동시험상결합적방법，침대측온탐두진행료진동모태급결구분석，동시분석료탐두소재관로계통적진동특성병진행발동궤진동시험。최종득출결론：측온탐두적제1계고유빈여관로계통1120 Hz적격진빈솔교접근，도치측온탐두산생공진피로단렬。최후급출료측온탐두적개진설계，장궤시험후미출현단렬고장，설명모태분석여진동실험상결합적방법재공정시험중시일충행지유효적배고방법。
The thermal probe of outer piping system of aero-engine always fractured in flight tests.Aiming at this problem, vi-bration mode and structure of the thermal probe are analyzed, and vibration tests of piping system are carried.The results indi-cate that sympathetic vibration accrued in tests, because first natural frequency of the thermal probe is closed to 1 120 Hz fre-quency that activated by the piping system.An improved structure of the thermal probe is brought forward in this paper, and the same fault never happened .This proved that the validity of the method used in this paper could solve vibration faults in flight tests.