Prestress-controllable vibration excitation method and device

Abstract

The invention discloses a prestress-controllable vibration excitation method and device, and belongs to the technical field of vibration measurement. A piezoelectric stack is combined with a T-shapedbeam, the piezoelectric stack generates a prestress value through a lever principle, and the prestress value is precisely regulated and controlled in a closed-loop mode, so that the problems of prestress loading and precise control when a giant magnetostrictive rod generates vibration waveform excitation are solved; an alternating magnetic field and a direct-current bias magnetic field are respectively applied to the giant magnetostrictive material rod in a double-layer coil mode, namely, sinusoidal waveform change vibration excitation with balanced load capacity and excellent waveform qualityis generated by the giant magnetostrictive rod which is precisely controlled by prestress to push a vibration table board to generate high-quality vibration waveforms with balanced load capacity; themethod and device are used for providing vibration excitation in various environments. The method and device can be used in air and can also be used for vibration excitation in an 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...

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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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