基于转子固有频率的涡轮泵故障检测方法

为了有效地检测液体火箭发动机涡轮泵的故障,分析了某型液体火箭发动机的28次历史试车数据,得到了涡轮泵转子的一阶、二阶和三阶临界转速以及轴向固有频率的数值,研究了这4个转子固有频率幅值的稳定性及对涡轮泵故障的敏感性,得出了它们具有较强的稳定性和故障敏感性的结论。在此基础上,提出并验证了基于转子固有频率的涡轮泵故障检测方法。结果表明,基于转子的一阶、二阶和三阶临界转速以及轴向固有频率幅值能有效地检测涡轮泵的故障。

Research on Turbopump Fault Detection Based on Rotor Intrinsic Frequency

To detect faults of a liquid rocket engine(LRE) turbopump effectively,a turbopump fault detection approach based on rotor intrinsic frequency is presented in this paper.First of all,28 LRE historical test data were analyzed,from which the values of the first,second and third order critical frequency and the axial intrinsic frequency were achieved.After that,the stability and turbopump fault sensitivity of this four rotor intrinsic frequencies were researched,from which we found that their intrinsic frequency amplitudes had high stability and fault sensitivity.Finally,the turbopump fault detection approach was validated by LRE historical test data.The results show that the turbopump faults can be detected effectively by using the amplitudes of rotor first,second and third order critical frequency as well as axial intrinsic frequency.