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 testing, specifically a vibration testing device and method for thin-walled structural parts based on a piezoelectric ceramic exciter. The device includes: a signal generator, a piezoelectric ceramic driving power supply, and a piezoelectric ceramic exciter. , feedback attenuator, laser vibrometer, data acquisition analyzer and host computer; the method includes modal testing of thin-walled structural parts, determining the linear relationship between the excitation voltage of the signal generator and the critical excitation frequency, based on the cantilever The beam theory is used to calibrate the excitation force of the piezoelectric ceramic exciter. The invention can effectively collect excitation signals, clarify the magnitude of the excitation force when the piezoelectric ceramic exciter excites structural parts, and can generate stable linear excitation signals with specified excitation force and excitation frequency, effectively eliminating the need for piezoelectric ceramics. The influencing factors of nonlinear excitation use piezoelectric ceramic exciters to achieve high-frequency excitation. The added mass is low and the device is easy 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...

AI Technical Summary

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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