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A method and system for evaluating early loosening of composite bolted connection structures

A technology for connecting structures and composite materials, which is applied in the analysis of materials, the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, force/torque/power measuring instruments, etc., to eliminate system nonlinear interference, sensitive early degradation, and accurate correlation Effect

Active Publication Date: 2022-05-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the research on condition monitoring of composite bolted connection structures based on nonlinear ultrasound is still in its infancy, and it is a key problem to be solved urgently in the field of composite material applications.

Method used

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  • A method and system for evaluating early loosening of composite bolted connection structures
  • A method and system for evaluating early loosening of composite bolted connection structures
  • A method and system for evaluating early loosening of composite bolted connection structures

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Experimental program
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Embodiment 1

[0060] In one or more embodiments, a method for early loosening evaluation of composite bolted connection structures is disclosed, referring to figure 1 , including the following procedures:

[0061] (1) Obtain the second-order nonlinear coefficient and sideband nonlinear coefficient of the composite material bolt;

[0062] Specifically, the second-order nonlinear coefficient expression:

[0063]

[0064] In the formula, A 1 is the fundamental amplitude, A 2 is the second harmonic;

[0065] Sideband nonlinear coefficient expression:

[0066]

[0067] In the formula, E(F H ±F L ), E(F H ±2F L ) are the energy values ​​of the first-order and second-order modulation sidebands respectively, E(F H ), E(F L ) are the energy values ​​of the high-frequency fundamental wave and the high-frequency fundamental wave component, respectively.

[0068] (2) Build a nonlinear ultrasonic monitoring system;

[0069] Specifically, build as figure 2 The nonlinear ultrasonic mon...

Embodiment 2

[0091] In one or more embodiments, a non-linear ultrasound-based evaluation system for early loosening of composite material bolted connections is disclosed, including:

[0092] The parameter acquisition module is used to acquire the second-order nonlinear coefficient and the sideband nonlinear coefficient of the ultrasonic response of the composite bolt connection structure;

[0093] A nonlinear ultrasonic monitoring system, used to perform parameter optimization experiments on the nonlinear ultrasonic monitoring system to determine the optimal response frequency and acoustic modulation signal parameters;

[0094] The response signal acquisition module is used to carry out nonlinear ultrasonic detection experiments on bolted joint structures in different pretension states, and obtain high-frequency response signals of one sending and one receiving and acoustic modulation response signals of two sending and one receiving respectively;

[0095] The regression model building mod...

Embodiment 3

[0099] In one or more embodiments, a terminal device is disclosed, including a server, the server includes a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor executes the The program realizes the early loosening evaluation method of the composite material bolted connection structure in the first embodiment. For the sake of brevity, details are not repeated here.

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Abstract

The invention discloses a method and system for evaluating early loosening of a composite material bolt connection structure, including: obtaining the second-order nonlinear coefficient and sideband nonlinear coefficient of the ultrasonic response of the composite material bolt connection structure; building a nonlinear ultrasonic monitoring system to determine the optimum Optimum response frequency and acoustic modulation signal parameters; carry out nonlinear ultrasonic testing experiments on bolted joint structures in different pre-tightening states, and obtain high-frequency response signals of one sending and one receiving and acoustic modulation response signals of two sending and one receiving respectively; The processing and analysis are carried out to obtain the variation rules of the above two parameters under different pretension states of the bolts, and a regression model based on machine learning algorithms is constructed; based on the model, the early loosening of the composite bolted connection structure is evaluated. The invention combines the two nonlinear ultrasonic detection methods of the harmonic wave method and the acoustic modulation technology, and has a more remarkable and accurate monitoring effect on the early state of bolt loosening.

Description

technical field [0001] The invention relates to the technical field of early loosening monitoring of composite material bolt connections, in particular to a method and system for evaluating early loosening of composite material bolt connection structures. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Due to its light weight, high strength, corrosion resistance, high temperature resistance and other excellent properties, carbon fiber reinforced composite materials provide feasible solutions for lightweight, service life and environmental adaptability in aerospace, railway tracks, building bridges, chemical equipment and other fields. The solution occupies an increasingly important position in the modern material application system. [0004] In the connection structure of composite materials, bolt connection has become the most widely use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/24G01L5/00G01N29/04G01N29/12G01N29/24G01N29/42G01N29/34G01N29/44G01N29/46G06F30/17G06F30/27G06K9/00
CPCG01L5/246G01L5/0042G01N29/04G01N29/12G01N29/245G01N29/42G01N29/346G01N29/4418G01N29/46G06F30/17G06F30/27G06F2113/26G06F2111/10G06F2119/02G06V10/478G06F2218/10G06F2218/02G06F2218/12
Inventor 姜明顺孙玲玉秦小舒张法业张雷隋青美贾磊
Owner SHANDONG UNIV
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