The power amplifier is based on the selective excitation application of arbitrary vibration pure modes of the structure of distributed shear piezoelectric sheets.
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Experimental content: In this study, a detection device for signal excitation and sensing by piezoelectric beam sensor was built, the stability of signal detection was analyzed, the resonance frequency and sound velocity of pear were extracted, and the hardness of pear was evaluated. Then, linear regression analysis was performed between the evaluation hardness of these two response parameters and the measurement results of the M-T puncture method (Magness-Taylor) to construct the detection model of the hardness of fragrant pear.
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Research direction: ultrasonic guided waves
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Test purpose: To evaluate the tracking resistance performance of ethylene-propylene rubber according to the tracking test standards, extract tracking fault characteristic quantities, study tracking fault diagnosis methods, and evaluate the surface tracking status of ethylene-propylene rubber.
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Experimental content: A microporous piezoelectric ultrasonic atomization effect test system was built. Working fluids including high-viscosity fluids were selected as atomization objects. The effects of the liquid's surface tension, viscosity, micropore diameter and driving voltage on the piezoelectric micron atomization were measured. The influence of droplet size and atomization flow rate of hole ultrasonic atomization was analyzed, and the changing trend of atomization effect was analyzed.
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Experimental content: Focus on studying the influence of the frequency, phase, amplitude, position and other factors of the two excitation source signals on the FBG response characteristics, so as to provide a parameter basis for subsequent damage location.
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