Wanzhang Wang

Shusheng Zhang

Xiaoling Li

This application relates to the field of electrical technologies, and provides a full even harmonic digital demodulation method based on full-phase analysis for a magnetic modulator. According to the full even harmonic digital demodulation method based on full-phase analysis for a magnetic modulator, standard voltage timing data output by the magnetic modulator is obtained when a DC calibration current with a set amplitude is fed into the magnetic modulator during calibration of the magnetic modulator; an output voltage sequence from full-phase Fourier analysis is established based on the standard voltage sequence data, and the output voltage sequence is preprocessed; comprehensive analysis is performed on the preprocessed output voltage sequence from full-phase Fourier analysis to obtain all standard even harmonic signals and current conversion coefficients.

Digital full even harmonic demodulation method based on full-phase analysis for magnetic modulator

Provided is an online fault diagnosis method for a solenoid valve based on analysis of time-frequency domain characteristics, which relates to the technical field of solenoid valve fault diagnosis. The online fault diagnosis method for a solenoid valve based on analysis of time-frequency domain characteristics includes: acquiring timing current data of a solenoid valve drive end, and performing time domain analysis and frequency domain analysis to obtain time domain and frequency domain feature vectors, respectively, and combining the time domain and frequency domain feature vectors to obtain a complex time-frequency domain feature vector; acquiring a plurality of sets of labeled complex feature vectors by changing an operating state of a solenoid valve and then generating an isolated forest model for evaluation by majority voting; and finally, realizing online diagnosis on a fault mode of the solenoid valve.

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Beijing, China

Wanzhang Wang