发动机起动过程的振动谱分析

在开展某型涡桨发动机振动监控课题研究工作时,曾迂到该型发动机在台架试车过程中出现压气机转子前部叶片严重偏磨和轴承损坏等故障,且每次都发生在起动过程,故障后均伴有严重的振动损坏现象。为此,我们决定从测量分析发动机起动过程的振动特性着手,寻找规律,为排故提供重要依据。因其问题属于瞬态振动分析,以运用实时振动分析技术进行数据处理为宜。 

VIBRATION SPECTRUM ANALYSIS OF A TURBOPROP ENGINE IN STARTING PROCESS

This paper describes how the FFT (Fast Fourier Transform)technique is applied to the spectrum analysis of the vibration signals recorded in starting process of a turboprop engine and what features of its spectrum have been found out. Based on analysing the vibration data recorded from 174 starting processes, the basic rules of vibration in starting of the engine are found and essential difference between normal and troubled engines is clarified. Vibration divergence in hot and cold startings and the influences of thermal deformation of the engine rotors on the vibration are also investigated.This work has accumulated data and experiences for fault diagnosis and monitoring in starting of the engine.