Dynamic strain tracing calibration method
A dynamic strain and calibration method technology, applied in the direction of measuring devices, instruments, etc., can solve the problem that the measurement resolution and real-time performance are difficult to meet the dynamic strain calibration, and achieve high calibration accuracy, high measurement precision, and simple measurement process.
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
The strain field can be measured by the laser speckle method, but its measurement resolution and real-time performance are difficult to meet the needs of dynamic strain calibration
Method used
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Embodiment 1
[0032] A dynamic strain traceability calibration method disclosed in this embodiment is based on such as figure 1 The dynamic strain traceability calibration device shown is realized, and the dynamic strain traceability calibration device includes a vibration exciter 1, a resonant beam 2, a laser vibrometer 3, a data acquisition system 4, a data processing system 5, reflective beads 6, strain Meter 7, strain demodulator 8.
[0033] The resonant beam is installed on the vibration exciter 1, and the installation point is at the center of the resonant beam 2 to form a dynamic strain generation system. The laser vibrometer 3, data acquisition system 4, and data processing system 5 are used as the standard dynamic strain measurement system; reflective beads 6 is pasted on the end of the upper surface of the resonant beam; the two beams of measuring laser beams emitted by the differential laser vibrometer 3 are irradiated on the reflective microbeads 6, and the reflected light is re...
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The invention discloses a dynamic strain tracing calibration method, and belongs to the field of metering test. A laser vibration meter is used as a measurement means, and the measurement precision ishigh. The method comprises the steps of: starting from the definition of strain, solving an analytical solution of a first-order vibration mode of a rectangular uniform-section resonant beam, and establishing a dynamic strain calibration tracing method of a resonant beam; and obtaining standard dynamic strain data of the surface of the resonance beam through single-point measurement. The measurement process is simple, and the calibration accuracy is high. The method is achieved based on a dynamic strain tracing calibration. The calibration device comprises a vibration exciter, a resonant beam, a differential laser vibration meter, a data acquisition system, a data processing system, reflective microbeads, a strain gauge and a strain demodulator. According to the invention, the surface vibration displacement of the resonant beam is measured, and then the surface dynamic strain distribution of the resonant beam is obtained through data processing. The method is not limited by a resonantbeam structure and an installation form, real-time strain data of the surface of the beam can be obtained, and dynamic strain tracing calibration is achieved.
Description
technical field [0001] The invention relates to a dynamic strain tracing method, which is used for dynamic calibration of strain gauges and belongs to the field of measurement and testing. Background technique [0002] With the development of science and technology, strain monitoring is more and more used in industrial fields. Compared with static strain, dynamic strain has rich spectrum information, which can completely reflect the operating state of mechanical structure, and has a wide range of application requirements in the fields of health monitoring and detection of aircraft and high-speed rail, design and manufacture of power machinery, and damage identification of wind turbine blades. . Because there is an adhesive layer between the strain gauge and the measured structure, the strain cannot be completely transmitted to the strain gauge, resulting in the difference between the strain measured by the strain gauge and the strain of the measured structure, resulting in ...
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Login to View More IPC IPC(8): G01B21/32
CPCG01B21/042G01B21/32
Inventor 张力隋广慧李泓洋黄彩霞尹肖薛景锋
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA