航空涡轮发动机失稳预警信号提取方法的研究

综合航空涡轮发动机失稳先兆波的幅值特性与频率特性,设计出能够提取失稳先兆特征的处理方法,并据此对发动机失稳数据进行处理与分析。通过使用不同的参数,此方法可实现对模态波和尖脉冲型失稳的预警。处理结果表明,此提取方法能够在失稳前15～20个转子周期内,有效地对尖脉冲型失稳进行预报,对模态波型失稳能够在60～80个转子周期前预警。并且此提取方法的算法复杂度较低,有利于失稳的在线预警,对航空燃气涡轮发动机主动控制技术的发展具有十分重要的意义。

Warning of Incipient Stall in Aerospace Gas Turbine Engine

A statistic method for Incipient Stall Warning, called Delayed Mean Square is introduced for detection of incipient stall in Aerospace Gas Turbine Engine. Experimental studies on stall inception processes have long observed two types of pre-stall compressor activity. By changing the parameters, the algorithm can be used to detect the pre-stall characteristic of axial flow compressors. Delayed Mean Square provides a potential advantage over RMS or FFT and because it rely on both frequency and amplitude.