A vibration excitation method and device with controllable prestress

Abstract

The invention discloses a vibration excitation method and device with controllable prestress and belongs to the technical field of vibration measurement. The present invention uses a piezoelectric stack combined with a T-beam method to generate a prestress value through the lever principle by the piezoelectric stack, and precisely regulates the prestress value in a closed-loop manner, thereby solving the problem of prestress when the giant magnetostrictive rod generates vibration waveform excitation. The problem of stress loading and precise control; applying an alternating magnetic field and a DC bias magnetic field to the giant magnetostrictive material rods in the form of double-layer coils, that is, the load capacity of the giant magnetostrictive rods precisely controlled by prestress is balanced, the waveform The vibration excitation with good-quality sinusoidal waveform changes pushes the vibration table to generate high-quality vibration waveform with balanced load capacity, which is used to provide vibration excitation in various environments. The invention can be used not only in the air, but also in the vibration excitation of the underwater environment.

Description

technical field [0001] The invention relates to a vibration excitation method and device with controllable prestress, belonging to the technical field of vibration measurement. Background technique [0002] Vibration excitation devices are the core of vibration measurement calibration. Various vibration tables are usually used to generate values. There are many theoretical and technical research results, most of which focus on the generation of vibration values ​​in the air. For various types of liquids such as underwater, especially It is more difficult to generate vibration in the conductive liquid, and one of the difficulties is emphatically reflected in the realization of the vibration excitation source. It involves many difficulties such as how to achieve insulation, sealing, and safety protection. [0003] Since the emergence of vibration excitation devices with giant magnetostriction as the core, it has provided technical possibilities for people to solve such proble...

AI Technical Summary

Problems solved by technology

[0004] For the vibration excitation device based on the giant magnetostrictive excitation principle, it is necessary to prestress the giant magnetostrictive rod exciter to obtain a balanced load capacity and high-quality vibration waveform, and the prestress load changes during the vibration process Impermanence, difficult to precisely control the problem

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