Waveform-variable automatic impact device for modal test

A modal test and impact device technology, applied in the measurement device, the use of a single impact force test material strength, impact test and other directions, can solve the problems of high degree of automation, uncontrollable waveform width, etc., to achieve high reliability and repeatability Strong, avoid the effect of combo phenomenon

Active Publication Date: 2015-09-16
HARBIN ENG UNIV
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  • Abstract
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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 accu

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  • Waveform-variable automatic impact device for modal test
  • Waveform-variable automatic impact device for modal test
  • Waveform-variable automatic impact device for modal test

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Embodiment Construction

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] combine Figure 1 to Figure 4 , a new automatic impact device with a variable waveform for modal testing designed by the present invention consists of a workbench 5, a support plate 4, a fixed guide rail 9, an adjustment column 13, a connecting rod 6, a hammer body 8, a hammer cap 11, and a sensor 10. For the composition of smart steering gear 1, crank plate 2 and some connecting parts, see figure 2 .

[0020] The support plate 4 and the fixed guide rail 9 are fixed on the workbench 5. There is a circular through hole on the top of the support plate 4, and a ball bearing is embedded in the hole, which plays the role of supporting the shaft section and lubricating the rotating pair. The rotation output end of the steering gear fixed on the support plate is connected with the shaft. The crank disc 2 is fixed on the end of the...

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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...

Claims

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Application Information

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IPC IPC(8): G01M7/08G01N3/30
Inventor 李玩幽刘子豪闫东生
Owner HARBIN ENG UNIV
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