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Displacement sensor based on double-stiffness square wave structure

A displacement sensor and dual stiffness technology, applied in the field of buffering and energy absorption, can solve problems such as the inability to meet the needs of large-scale measurement and the limitation of the use range, and achieve the effects of improving the accuracy of deformation measurement, increasing the measurement range, and expanding the use range

Pending Publication Date: 2022-03-04
NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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Problems solved by technology

[0004] The embodiment of the present application provides a displacement sensor based on a double-stiffness square-wave structure to solve the technical problem that the existing fiber Bragg grating displacement sensor cannot meet the measurement needs of a large range and the range of use is greatly limited

Method used

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  • Displacement sensor based on double-stiffness square wave structure
  • Displacement sensor based on double-stiffness square wave structure
  • Displacement sensor based on double-stiffness square wave structure

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Embodiment

[0140] Taking the material properties and structural dimensions shown in Table 1, through theoretical calculation and numerical simulation, the change curve of the load P of the single-period square wave structure unit with displacement Δ before and after buckling and the corresponding buckling critical load can be obtained, as shown in Figure 10 shown. Among them, the analytical solution adopts the previously obtained analytical formula of buckling critical load shown in formula (17), and the analytical formula of tensile stiffness before and after buckling shown in formulas (20) and (23). The square wave structure in the simulation solution adopts the beam element model described by the geometrically accurate method. As shown in Figure 10, the analytical solution is consistent with the simulation solution, which shows that the critical buckling load of the single-period square wave structural element and the analytical solution of the stiffness before and after buckling obt...

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Abstract

The invention discloses a displacement sensor based on a double-stiffness square-wave-shaped structure, and the sensor comprises a fiber Bragg grating, and also comprises a square-wave-shaped structure series array, and the square-wave-shaped structure series array is connected with the fiber Bragg grating and has two tensile stiffness, namely, the tensile stiffness before buckling and the tensile stiffness after buckling. According to the invention, the square-wave-shaped structure series array with two tensile rigidities before and after buckling is adopted to replace an existing linear elastomer and is connected with the fiber bragg grating in series to form the displacement sensor with a double-rigidity characteristic, so that the displacement sensor has two linear segments during stretching, the measurement range of the displacement sensor is greatly increased, and the measurement precision of the displacement sensor is improved. The application range of the device is expanded, and the device has good advantages and application prospects in the aspect of improving the deformation measurement precision of the large deformable body.

Description

technical field [0001] The present application relates to the technical field of buffering and energy absorption, and in particular, relates to a displacement sensor based on a double-stiffness square wave structure. Background technique [0002] At present, there are various types of displacement sensors, including potentiometric displacement sensors, resistive displacement sensors, electromagnetic displacement sensors, fiber Bragg grating displacement sensors, and laser measurement. Compared with various traditional sensors, displacement sensors have the advantages of anti-electromagnetic interference, corrosion resistance, and high measurement accuracy. Among them, fiber Bragg grating sensors are widely used in engineering fields and have mature technologies. Bare fiber Bragg gratings can be directly pasted on the The surface of the body or embedded in the structure, it can also be used after packaging. [0003] The existing fiber Bragg grating sensor adopts the fiber Br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02
CPCG01B11/02
Inventor 付康佳张翔刘红卫熊丹黄奕勇
Owner NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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