To address the issue of some motors in industrial sites being unable to be equipped with speed sensors,this study proposes a motor speed measurement method based on vibration signals and synchrosqueezed wavelet transform.Initially,the motor vibration signal is subjected to Hilbert transform to obtain the envelope signal,demodulating the vibration component directly related to speed.Then,the synchrosqueezed wavelet transform is employed to analyze and compute the time-frequency map of the envelope signal.Finally,the cost function method is improved by introducing the interquartile range and variance of the ridge line,and this modified method is used to extract the time-frequency ridge line of the fundamental frequency vibration component from the time-frequency map,thereby obtaining the motor's speed curve to achieve speed measurement without a tachometer.Through simulation and experimental validation,the proposed method can accurately detect motor speed under both steady and non-steady conditions,and the error does not exceed 5%.The research and practice process of this method can deepen students'understanding of the theoretical knowledge of modulation and demodulation,time-frequency analysis,etc.,and improve their ability to link theory with practice.
关键词
无转速计测速/Hilbert变换/同步压缩小波变换/振动信号/实验设计与分析
Key words
tacho-less speed measurement/Hilbert transform/synchrosqueezing wavelet transform/vibration signal/experimental design and analysis
维普
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