| BIAN Jie，CHEN Ya-nong，LU Yan-hui.LMD Slice Spectrum Analysis and Time Frequency Distribution of Vibration Stress Signal of High and Low Pressure Rotor Elastic Support[J].航空发动机,2021,47(5):47-54 |
| LMD Slice Spectrum Analysis and Time Frequency Distribution of Vibration Stress Signal of High and Low Pressure Rotor Elastic Support |
| DOI： |
| Key Words:high and low pressure rotor elastic support vibration stress signal local mean decomposition slice spectrum time frequency distribution aeroengine |
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| Abstract:In order to solve the problem that the traditional spectrum analysis method can not identify the characteristic frequency of
aeroengine rotor vibration well，the frequency analysis method of local mean decomposition combined with slice spectrum is used to decom?
pose the vibration signal of aeroengine rotor adaptively and identify the peak frequency. The time-frequency distribution of rotor vibration
signal is obtained through time-frequency analysis. The method is applied to the analysis of vibration stress signal of elastic support of high
and low pressure rotors of an aeroengine. Compared with the normal state of engine vibration，in the LMD slice spectrum of vibration stress
signal of elastic support of high and low pressure rotors under abnormal state of engine vibration，in addition to the fundamental frequency
and multiple frequency components of high and low pressure rotors，there are also modulation frequencies between high and low pressure
rotors，and the time-varying characteristics of F components under abnormal state are more obvious. Therefore，the vibration spectrum
characteristics and time-frequency distribution under normal and abnormal state of engine vibration are obtained by this method，which
can provide certain reference for vibration feature extraction and state identification of aeroengine rotor. |
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