Resonant dynamic strain calibration device and method
A technology of dynamic strain and calibration device, applied in measurement 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: 2020-02-28
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, and belongs to the field of metering test. The resonant dynamic strain calibration device comprises an excitation source, a resonance beam, a laser interferometer, a numerical control micro-displacement mechanism, a data acquisition system and a data processing system. The resonance beam is installed on the excitationsource to form a dynamic strain excitation system, and the laser interferometer is connected with the data acquisition system and the data processing system to serve as a standard dynamic strain measurement system. The invention further discloses a resonance type dynamic strain calibration device and method. On the basis, a strain gauge is installed on the calibration device, aiming at the dynamic strain gauge, laser interference measurement is taken as a means, fitting is carried out through a deformation curve in the vertical direction of the surface of the beam, then a second derivative ofthe fitting curve is solved to calculate dynamic strain, and dynamic calibration of the strain gauge is achieved by comparing standard dynamic strain with output of the strain gauge. The resonant dynamic strain calibration device and method are suitable for tracing the dynamic strain of the resonance 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...
Claims
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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