Vibration testing device and method for thin-walled structural parts based on piezoelectric ceramic vibrator

Abstract

The invention belongs to the technical field of vibration test, in particular to a thin-walled structure part vibration test device and a method based on a piezoelectric ceramic vibration exciter. The device comprises a signal generator, a piezoelectric ceramic drive power supply, a piezoelectric ceramic vibration exciter, a feedback attenuator, a laser vibration meter, a data acquisition analyzer and an upper computer. The method comprises the steps of performing modality test on a thin-walled structure part, determining a linear relationship between excitation voltage and critical excitation frequency of the signal generator and calibrating an excitation force of the piezoelectric ceramic vibration exciter based on a cantilever theory. According to the device and the method, an excitation signal can be effectively acquired; the magnitude of the excitation force when the piezoelectric ceramic vibration exciter excites the structure part is defined; the stable designated excitation force and the linear excitation signal of the excitation frequency can be generated; influencing factors of non-linear piezoelectric ceramic excitation are effectively eliminated; the piezoelectric ceramic vibration exciter is adopted to realize high-frequency vibration excitation; additional mass is low; and the device is convenient to use.

Description

technical field [0001] The invention belongs to the technical field of vibration testing, in particular to a vibration testing device and method for a thin-walled structural part based on a piezoelectric ceramic vibrator. Background technique [0002] There are a large number of thin-walled structural parts in engineering equipment, such as various shell parts, sleeve parts, ring parts, disc parts, flat parts, etc. These thin-walled structural parts often induce high-cycle fatigue and fail under high-frequency excitation environments. In order to understand the vibration failure mechanism of these thin-walled structural parts and to control them better, it is urgent to accurately measure the modal performance and vibration response behavior of these thin-walled structural parts. [0003] Compared with ordinary structural systems, the natural frequencies of the above-mentioned thin-walled structural parts are usually higher. If more modal orders are considered, a larger freq...

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Problems solved by technology

[0005] However, the piezoelectric ceramic excitation system used in the existing vibration test is usually an open-loop system, that is, the high-voltage excitation signal loaded on the piezoelectric ceramic is difficult to be collected by the data acquisition analyzer. Vibration force and excitation frequency cannot be recorded and controlled

The above-mentioned traditional piezoelectric ceramic excitation mode cannot meet the test requirements for effectively obtaining the inherent characteristics and vibration response characteristics of thin-walled structural parts, thus limiting the further application of piezoelectric ceramic exciters

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