Waveform-variable automatic impact device for modal test

Abstract

The invention provides a waveform-variable automatic impact device for a modal test, and belongs to the field of modal tests. The waveform-variable automatic impact device for the modal test mainly comprises a controller, a digital steering engine, a workbench, a crank-connecting rod mechanism formed by a crank disc and a connecting rod, an impact head device, a sensor, a connecting stud, a linear optical axis guide rail, lubricating components of various motion pairs, corresponding supporting and fixing components and the like, wherein the impact head device comprises an impact hammer cap for damping replacement and a hammer body. According to the invention, the instantaneous rotating speed of the intelligent steering engine is controlled through programming, specific impact waveforms such as triangular waves, pulse waves and the like are outputted, circumferential motions are transformed into reciprocating rectilinear motions by adopting a crank-guide rod mechanism, and the tail end of a guide rod is additionally provided with a hammer to output an exciting force. The contact time between the hammer and an excited portion can also be controlled, and the adjustability of an impact force and the impact time are ensured. A problem that manual knock contact is difficult in excitation time control, poor in repeatability and difficult to excite ideal pulse waves is solved.

Description

technical field [0001] The invention relates to an automatic shock device capable of changing waveforms, in particular to a variable waveform automatic shock device for modal testing, which belongs to the field of modal testing. Background technique [0002] Ordinary mechanical exciters cause uneven vibration amplitudes, and even the strength of each excitation in a single experiment is inconsistent, so it is impossible to guarantee the accuracy and reliability of the data measured in the experiment. Even if some improved devices refit the impact hammer into an eccentric mechanism, it can roughly ensure that the excitation amplitude of each cycle is consistent, but the rate within the cycle is still fixed, or only a single vibration can be excited at a certain speed. Sine wave, but for instantaneous excitation caused by variable speed within a period, such as more accurate triangular wave, pulse wave, etc., it cannot be realized. [0003] If you want to adjust the amplitude...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the disadvantages that the existing impact device cannot excite waveforms other than sine waves, and the waveform width is uncontrollable, and each impact is accurately output through a programmable intelligent driving mechanism, and the shock wave has good repeatability , with a high degree of automation to provide a variable waveform automatic impact device for modal testing

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