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Dynamic strain calibration method with continuously adjustable frequency

A technology of dynamic strain and calibration method, which is applied in the direction of measuring devices and instruments, can solve the problems of principle error, inability to meet structural dynamic strain measurement, lack of calibration method and device for dynamic characteristics of strain gauge, etc., and achieve continuous calibration frequency and amplitude adjustable effect

Active Publication Date: 2021-06-22
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, strain gauges are generally used to measure strain, and there is a lack of effective calibration methods and devices for the dynamic characteristics of strain gauges. There has been a long-term practice of replacing dynamic calibration with static calibration, which has errors in principle and cannot meet the needs of structural dynamic strain measurement.

Method used

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  • Dynamic strain calibration method with continuously adjustable frequency
  • Dynamic strain calibration method with continuously adjustable frequency
  • Dynamic strain calibration method with continuously adjustable frequency

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Embodiment 1

[0032] Such as figure 1 As shown, the frequency continuously adjustable dynamic strain calibration method disclosed in this embodiment is based on the frequency continuously adjustable dynamic strain calibration device disclosed in this embodiment. The dynamic strain calibration device includes a vibration exciter 1, a cantilever beam 2, Laser interferometer 3, data acquisition system 4, data analysis system 5, strain demodulator 6, calibrated strain gauge 7, micro-displacement mechanism 8, flexible rod 9.

[0033] Such as figure 2 As shown, first select a cantilever beam 2 with a constant section with a length of 200 mm, a thickness of 10 mm, and a first-order natural frequency of about 1 kHz. A rectangular cantilever beam with a constant cross section is used. First, one end of the cantilever beam 2 is fixed, and the abscissa of the fixed end is 0. One end is installed on the vibration exciter 1 through a flexible rod 9, which requires the flexible rod to have a higher fir...

Embodiment 2

[0045] The present invention will be further described below in conjunction with the accompanying drawings and the embodiment based on the second method.

[0046] Such as figure 2As shown, first select a cantilever beam 2 with a constant cross-section whose length is 200 mm, thickness is 10 mm, and the first-order natural frequency is about 1 kHz. One end of the cantilever beam 2 is fixed, and the other end is installed on the modal exciter 1 through a flexible rod 9. It is required that the flexible rod has a higher first-order resonance frequency and can have a certain lateral displacement under the action of lateral force. The strain gauge 7 to be calibrated is installed on the upper surface of the cantilever beam 2 and connected with the strain interrogator 6 . The laser interferometer 3 is installed on the micro-displacement mechanism 8 . The laser beam of the laser interferometer 3 is adjusted so that it can measure the displacement of the upper surface of the cantile...

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Abstract

The dynamic strain calibration method with continuously adjustable frequency disclosed by the invention belongs to the field of measurement and testing. The method of the present invention is realized by a dynamic strain calibration device based on a cantilever beam, and the calibration device includes a vibration exciter, a cantilever beam, a laser interferometer, a data acquisition system, a data analysis system, a strain demodulator, a calibrated strain gauge, and a micro-displacement mechanism , Flexible rods. Start the dynamic strain excitation system to generate sinusoidal strain; measure the displacement of the beam in the vertical direction by laser interferometer, and calculate the standard strain value of each point; the calibrated strain gauge is installed on the surface of the cantilever beam, and the strain interrogator performs a Demodulation, the data acquisition system synchronously collects the output signals of the laser interferometer and the strain demodulator, and the data processing system compares the standard strain value with the output of the calibrated strain measurement system to realize the dynamic calibration of the strain gauge. The invention can meet the requirement of the dynamic calibration of the strain gauge for continuously changing frequency, and the applicable calibration frequency range is 0 to 500 Hz.

Description

technical field [0001] The invention relates to a calibration method, in particular to a dynamic strain calibration method with continuously adjustable frequency, and belongs to the field of measurement and testing. Background technique [0002] Dynamic strain is an important parameter for dynamic load testing and health monitoring of machinery. Accurate and reliable dynamic strain measurement data are of great significance for judging the reliability of mechanical structures, determining the health status of machines, and detecting structural damage. [0003] At present, strain gauges are generally used to measure strain. There is a lack of effective calibration methods and devices for the dynamic characteristics of strain gauges. For a long time, static calibration has been used instead of dynamic calibration. This has errors in principle and cannot meet the needs of structural dynamic strain measurement. Therefore, there is a need for a dynamic strain calibration method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/32
CPCG01B21/042G01B21/32
Inventor 黄彩霞张力隋广慧尹肖李泓洋薛景锋
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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