A resonance dynamic strain calibration device and method
A dynamic strain and calibration device technology, applied in measuring devices, instruments, etc., can solve the problems of difficult traceability of dynamic strain, difficult dynamic strain excitation signal, etc., and achieve the effect of high frequency and large value dynamic strain calibration
Active Publication Date: 2021-04-06
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology
There is no mature method for dynamic calibration of strain gauges. The main problems are that it is difficult to generate dynamic strain excitation signals for calibration, and the second is that it is difficult to trace the source of dynamic strain.
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Embodiment 1
[0030] Such as figure 1 As shown, a resonant dynamic strain calibration device disclosed in this embodiment first selects a constant-section beam 2 with a first-order natural frequency of 800 Hz. For specific structural dimensions, refer to the appended figure 2 . Install the resonant beam 2 on the excitation source 1 firmly. The strain gauge 5 to be calibrated is installed on the lower surface of the resonant beam 2, and the strain interrogator 6 is connected to the strain gauge 5 to be calibrated. The laser interferometer 4 is erected on the numerical control micro-displacement platform 3, and the laser beam is adjusted so that it can scan and measure the upper surface of the resonant beam 2. The output signals of the strain interrogator 6 and the laser interferometer 4 are connected to the data acquisition system 7 respectively, and then the calibration results are analyzed by the data processing system 8 .
[0031] During the calibration process, start the excitation s...
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The invention discloses a resonant dynamic strain calibration device and method, belonging to the field of metrology and testing. A resonant dynamic strain calibration device disclosed by the invention comprises an excitation source, a resonant beam, a laser interferometer, a numerically controlled micro-displacement mechanism, a data acquisition system, and a data processing system. The resonant beam is installed on the excitation source to form a dynamic strain excitation system, and the laser interferometer is connected with the data acquisition system and data processing system as a standard dynamic strain measurement system. The invention also discloses a resonant dynamic strain calibration device and method. On this basis, the strain gauge is installed on the calibration device. For the dynamic strain gauge, laser interferometry is used as a means to fit the deformation curve in the vertical direction of the beam surface. Then calculate the dynamic strain by calculating the second derivative of the fitting curve, and realize the dynamic calibration of the strain gauge by comparing the output of the standard dynamic strain and the strain gauge. The invention is suitable for traceability of the dynamic strain of the resonant beam in any structural form.
Description
technical field [0001] The invention relates to a dynamic strain calibration device and method based on a resonant beam, in particular to a device for generating high-frequency large-value dynamic strain and performing dynamic calibration on strain gauges, belonging to the field of measurement and testing. Background technique [0002] Dynamic strain testing is an important tool for structural design, fabrication and health monitoring. Accurate and reliable dynamic strain measurement data are of great significance for judging structural reliability, determining structural resonance points, and detecting structural damage. In the field of dynamic strain testing, strain gauges such as strain gauges and optical fiber gratings are widely used to paste on the surface of the structure under test to obtain the strain information of the structure. In order to ensure the accuracy of strain gauge testing, it needs to be dynamically calibrated. [0003] At present, a static strain ca...
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IPC IPC(8): G01B21/32
CPCG01B21/042G01B21/32
Inventor 张力隋广慧薛景锋黄彩霞尹肖李泓洋
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA