A variable waveform automatic impact device for modal testing

A technology of modal testing and impact device, which is applied in the direction of measuring device, testing material strength with one-time impact force, impact test, etc., can solve the problems of uncontrollable waveform width and high degree of automation, and achieve strong repeatability and high reliability , the effect of firm design

Active Publication Date: 2017-08-04
HARBIN ENG UNIV
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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 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

Method used

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  • A variable waveform automatic impact device for modal testing
  • A variable waveform automatic impact device for modal testing
  • A variable waveform automatic impact device for modal testing

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] 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 .

[0019] 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 variable waveform automatic impact device for modal testing, which belongs to the field of modal testing. , sensor, connecting stud, linear optical axis guide rail, lubricating parts of various motion pairs and corresponding supporting and fixing parts, etc., the impact head device includes a replaceable damping impact hammer cap and hammer body, the present invention controls the intelligent steering gear through programming The instantaneous rotational speed of the motor can output specific shock waveforms, such as triangular waves, pulse waves, etc., the crank guide rod mechanism is used to convert the circular motion into reciprocating linear motion, and a hammer head is installed at the end of the guide rod to output the excitation force; it can also control the relationship between the hammer head and the rod. The contact time of the excited part ensures the adjustability of the impact force and the impact time; it solves the problems of difficult control of the excitation time, poor repeatability, and difficulty in exciting the ideal pulse wave for manual knock contact.

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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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/08G01N3/30
Inventor 李玩幽刘子豪闫东生
Owner HARBIN ENG UNIV
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