Order tracking method for gas turbine combined with synchro extracting transform and Vold-Kalman filtering

ZHANG Wen-hai1, HU Ming-hui1, JIANG Zhi-nong 2, FENG Kun2
(1.Key Lab of Engine Health Monitoring-Control and Networking of Ministry of Education, Beijing University of
Chemical Technology, Beijing 100029, China; 2.Beijing Key Laboratory of Highend Mechanical Equipment
Health Monitoring and Self-Recovery, Beijing University of Chemical Technology, Beijing 100029, China)

Abstract: Aiming at the problem that gas turbines used in pipelines, ships, aviation and other industries frequently changed the speed, which makes it difficult to extract target order components, the gas turbine vibration order tracking method was studied. A method for order tracking of gas turbine combined with synchro extracting transform and VoldKalman filtering was proposed. First, the vibration acceleration signal was integrated to obtain a vibration speed signal with significant rotor power frequency. Then, with the reference of poor synchronization speed data, the SET was used to extract the instantaneous frequency (IF), which was the synchronous and accurate rotor power frequency. Finally, the VKF method was used to extract the target order waveform with the input of vibration signal and rotor power frequency. The method was applied to analysis actual gas turbine vibration data. The results indicate that it can accurately and effectively extract the target order waveform of the gas turbine, which can provide data support for vibration condition monitoring and early warning.
Key words: gas turbine; vibration signal; synchro extracting transform (SET) ; Vold-Kalman filtering(VKF); order tracking