Rub-impact sound emission fault diagnosis method based on empirical wavelet transformation
An empirical wavelet and fault diagnosis technology, applied in the measurement of ultrasonic/sonic/infrasonic waves, measurement devices, instruments, etc., can solve the problems of signal modal aliasing, time-consuming, and the orthogonality of modal components needs to be demonstrated, and achieve elimination. The effect of modal aliasing
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[0045] The rub-impact acoustic emission experiment system consists of a rotor rub-impact experiment table, sensors, preamplifiers, speed governors and acoustic emission acquisition systems. As shown in Figure 1, the rotor rubbing test bench is a flexible rotor test bench, which is composed of three bearing seats with sliding bearings to support the rotor, two rubbing discs, and rubbing screws. The rubbing screw can point to the center of the rotating shaft through the screw hole on the cover-shaped wave guide and contact the side of the disc. When the rotor rotates at a certain speed, the adjustment rub-impact screw and the rub-impact disc will collide, and the generated rub-impact acoustic emission signal is received by the acoustic emission sensor through the wave guide. By adjusting the screwing depth of the rubbing screw, the rubbing of different strengths can be simulated. The speed governor realizes the stepless speed regulation of the motor in the range of 0-10000r / min;...
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