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Resistance strain type displacement meter and manufacturing method thereof

A technology of resistance strain type and manufacturing method, which is applied in the field of mechanical engineering, can solve the problems of low dynamic response frequency, limited precision, and small size, and achieve the effects of good compatibility, guaranteed measurement accuracy, and small size

Inactive Publication Date: 2019-04-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there are many types of displacement meters for different usage scenarios, but generally there are problems such as high precision, large volume, small volume, limited precision, or low dynamic response frequency, etc.

Method used

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  • Resistance strain type displacement meter and manufacturing method thereof
  • Resistance strain type displacement meter and manufacturing method thereof
  • Resistance strain type displacement meter and manufacturing method thereof

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Embodiment

[0068] In this embodiment, the annular seam measurement of the tunnel model shaking table test is selected as the target measurement scene, the target measurement range is 0.5 mm, and the accuracy requirement is 1%. According to the measurement target, the selected displacement meter has a range of 0.6mm and an accuracy of 0.3%. The 3D printing material is nylon, with an elastic modulus of 2.6GPa. Select the strain gauge with a range of 20000 microstrain and an accuracy of 0.3%.

[0069] The specific parameters of each part of the displacement meter in this embodiment are designed as follows:

[0070] Applied formula (1), D FS = 0.6mm, S FS =0.02, it can be calculated that the gauge length of the displacement gauge is 30mm.

[0071] The cross-section of the base is selected as a T-shaped cross-section. The T-shaped cross-section has a web width of 10 mm, a thickness of 1 mm, a wing plate width of 1.5 mm, and a height of 2 mm. Applied formula (2), F cr =801.3N, E=2.6GPa, ...

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Abstract

The invention relates to a resistance strain type displacement meter and a manufacturing method thereof. The displacement meter comprises an installation supporting seat, a substrate, a strain gauge and an insulation cover layer, the substrate is fixed to the installation supporting seat, the strain gauge is pasted on the substrate, and is covered with the insulation cover layer, and a bolt hole for connecting with a measuring target is formed in the installation supporting seat. The manufacturing method comprises the following steps that according to the requirements of the measuring target,the displacement meter measuring range and the measurement accuracy are determined; the strain gauge measuring range and the displacement meter gauge distance are determined; the cross section form and size of the substrate are designed, so that the substrate meets the axial compression load requirements of the substrate of the displacement meter and the allowable interference external force of the measuring target; according to the target measurement scene, the installation supporting seat is designed; based on the designed substrate and the installation supporting seat, the substrate and theinstallation supporting seat are integratedly formed by 3D printing processing; and the strain gauge is pasted and covered with the insulation cover layer to protect. Compared with the prior art, theresistance strain type displacement meter and the manufacturing method thereof have the advantages of small volume, high measurement accuracy, high dynamic response frequency and the like.

Description

technical field [0001] The invention belongs to the field of mechanical engineering, and in particular relates to a resistance strain gauge and a manufacturing method thereof. Background technique [0002] Commonly used instruments for electrical sensing displacement measurement include inductive displacement gauges, vibrating wire displacement gauges, and resistance strain gauges, which usually output analog signals such as voltage and current or directly output digital signals. The general accuracy of analog signal output can reach 0.25%. The digital signal output accuracy can reach up to 0.1%. Displacement measurement is widely used in various industries such as machinery, aerospace, and civil engineering, and is a basic measurement item. Therefore, there are many types of displacement meters for different usage scenarios, but generally there are problems such as high precision, large volume, small volume, limited accuracy, or low dynamic response frequency. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/02
CPCG01B7/02
Inventor 袁勇杨喻声禹海涛张劭华
Owner TONGJI UNIV
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