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Modal analysis method for complex structural member based on networked fiber grating sensitive element

A fiber grating, complex structure technology, used in measuring devices, instruments, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of high cost, large quality of piezoelectric ceramic sensors, complicated testing steps, etc., and achieves light weight and high sensitivity. , the effect of low cost

Pending Publication Date: 2022-01-25
BEIHANG UNIV
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Problems solved by technology

[0004] When complex structural parts need to be modal tested by existing methods, the piezoelectric ceramic sensor used in the traditional piezoelectric ceramic test method has the disadvantages of large mass, high cost, complicated test steps, and easy to produce mass effect.

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  • Modal analysis method for complex structural member based on networked fiber grating sensitive element
  • Modal analysis method for complex structural member based on networked fiber grating sensitive element
  • Modal analysis method for complex structural member based on networked fiber grating sensitive element

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Embodiment Construction

[0026] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so as to better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0027] A modal analysis method for complex structural parts based on networked fiber grating sensitive components, wherein the optical signal output by the fiber grating signal demodulator (2) enters the fiber grating vibration sensor (4); the hammer (5) strikes the structural part The reference point on (3) generates a vibration signal on the structure (3), and the fiber grating vibration sensor (4) pasted on the measuring point of the structure (3) feels the vibration signal, which is consistent with the fiber grating vibration sensor (4) The conditioned narrow-band light is reflected back, and the ...

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Abstract

The invention discloses a modal analysis method for a complex structural member based on a networked fiber grating sensitive element, and belongs to the field of engineering vibration analysis. A novel mode analysis means is provided, the limitation of a traditional mode analysis method based on an electric sensor is overcome, a vibration force hammer is used for applying vibration excitation to a reference point of the complex structural member, and fiber grating vibration sensors arranged at all measuring points collect response output signals of the measuring points. Wavelength information of the sensors is stored in a computer through demodulation equipment, and after preprocessing such as filtering and noise removal, wavelength signals are processed and analyzed through test modal analysis software, and the modal frequency, the damping ratio and the vibration mode of the tested complex structural member are obtained. The system is simple in structure, high in anti-electromagnetic interference capability, high in calculation speed, accurate in measurement result, high in precision and good in flexibility.

Description

technical field [0001] The invention belongs to the field of engineering vibration analysis, in particular to a modal analysis method for complex structural parts based on networked optical fiber grating sensitive elements. Background technique [0002] Modal is the inherent natural vibration characteristics of the structure, and it is also the response of the overall characteristics of the structure. Any change in the physical parameters of the structure will affect its modal parameters, namely natural frequency, damping and mode shape. This has important implications for the performance testing of monolithic structural components that are prone to local failures due to complex junctions. The invention is a modal analysis method for complex structural parts based on networked optical fiber grating sensitive elements, which is designed based on the modal test of complex structural parts. The fiber grating sensor has the advantages of high measurement accuracy, small size, l...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 魏鹏张天源吕建勋刘颖异袁海文李成贵
Owner BEIHANG UNIV
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