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周春华,叶子龙,芦吉云,等. 基于瞬时能量密度谱的航空发动机双发差异信号监测[J]. 科学技术与工程, 2020, 20(23): 9655-9659.
ZHOU Chun-hua,YE Zi-long,et al.Dual-engine Difference Monitoring of Aero-engine Based on Instantaneousenergy density spectrum[J].Science Technology and Engineering,2020,20(23):9655-9659.
基于瞬时能量密度谱的航空发动机双发差异信号监测
Dual-engine Difference Monitoring of Aero-engine Based on Instantaneousenergy density spectrum
投稿时间:2019-10-14  修订日期:2020-05-04
DOI:
中文关键词:  双发差异监测  飞行数据  总体平均经验模式分解  信号重构  瞬时频率
英文关键词:dual-engine difference monitoring  flight data  Ensemble Empirical Mode Decomposition  signal reconstruction  instantaneous frequency.
基金项目:
              
作者单位
周春华 上海卫星工程研究所
叶子龙 南京航空航天大学
芦吉云 南京航空航天大学
贾奥男 上海卫星工程研究所
吕雨薇 南京航空航天大学
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中文摘要:
      针对非线性、非平稳航空发动机双发差异信号,提出利用瞬时能量密度谱凸显微波动信号这一方法获得双发差异波动值出现的时间。通过总体平均经验模式分解(EEMD)结合希尔伯变换(HT)求解信号的HT谱与瞬时能量密度水平,从频率、幅值与时间三方面给出信号特征。以燃油流量为例,分析了航空发动机气路参数差值在巡航段的波动情况。结果表明:在2095s、3600s左右发动机燃油流量差值(ΔFF)出现微弱波动,且后者波动幅值为前者的1/5,频率范围集中在0-0.2Hz之间。2095s信号波动是由飞机飞行高度、航向变化及加速度变化引起的,3600s信号波动是加速度变化导致的。由瞬时能量密度谱获得航空发动机参数微波动发生的精确时间,并与QAR记录的同时刻其他相关数据进行对比,追溯发动机FF变化的原因,判断航空发动机是否存在故障。
英文摘要:
      According to nonlinear and nonstationary dual-engine difference signal of aero-engine, Instantaneous energy density spectrum methods were proposed to display the micro-fluctuation signals. Hilbert spectrum and instantaneous energy density level were solved by Ensemble Empirical Mode Decomposition (EEMD) combined with hilbert transform(HT), signals characters such as frequency, time and amplitude were obtained. Taking fuel flow as an example, fluctuations of gas path parameters difference of aircraft engine during cruising were analyzed. Results showed: fuel flow difference of left and right aircraft engine fluctuated slightly at 2095 seconds and 3600 seconds with 0-0.2Hz frequency domain and the latter fluctuation amplitude was 1/5 times smaller than the fromer’s. Signal fluctuation ,which occurred at 2095s,cased by flight altitude, course deviation and acceleration change and Signal fluctuation at 3600 seconds induced by acceleration change. The time of dual-engine differences were obtained by instantaneous energy density spectrum and other aero-engine parameters at the same time were compared with the dual-engine difference to traces the reasons of engine changes, which can estimate the fault of aircraft engine.
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