Connecting structure looseness diagnosis method based on multi-scale dynamic separation

A connection structure and diagnostic method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of large amount of calculation and low accuracy, and achieve less calculation amount, high accuracy, easy to use and maintain The effect of working convenience

Inactive Publication Date: 2018-01-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to avoid the problems of low accuracy and large amount of calculation in the loose connection detection method based on nonlinear vibration signals in the prior art, the present invention proposes a loose connection structure diagnosis method based on multi-scale dynamic separation

Method used

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  • Connecting structure looseness diagnosis method based on multi-scale dynamic separation
  • Connecting structure looseness diagnosis method based on multi-scale dynamic separation
  • Connecting structure looseness diagnosis method based on multi-scale dynamic separation

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Embodiment Construction

[0038] This embodiment is a method for diagnosing loose connection structures based on multi-scale dynamic separation.

[0039] refer to Figure 1 to Figure 9In this embodiment, the loose connection structure diagnosis method based on multi-scale dynamic separation is analyzed for the applied connection beam structure, and the specific steps are as follows:

[0040] Step 1. Create a reference database offline

[0041] 1. According to the applied connecting beam structure, the connecting beam is suspended with a spring rope to simulate a free state. The accelerometer is bonded with wax at one end of the connecting beam, the accelerometer and the acquisition device are connected to the computer, and the other end is fixed in position, and the beam is excited by using a hammer excitation method.

[0042] 2. Use a digital display torque wrench to tighten the bolt to be tested to the rated pre-tightening torque of the bolt. In this example, M8 bolts are used, and the rated torque...

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PUM

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Abstract

The invention discloses a connecting structure looseness diagnosis method based on multi-scale dynamic separation and belongs to the field of connecting structure fault diagnosis technology. Accordingto an applied connecting beam structure, a connecting beam is suspended through a rubber rope and used for simulating a free state; an accelerometer is connected to one end of the connecting beam ina bonding mode with wax, the accelerometer and a data collection device are connected to a computer, the other end of the connecting beam is fixed, and an exciting hammer excitation mode is adopted; and the loose state of connection can be diagnosed just by measuring a structure response of the structure under pulse dynamic excitation and performing analysis and modeling on a response signal in combination with a reference database. The connecting structure looseness diagnosis method has the advantages of high precision, small calculated amount and low cost. When the method is applied to engineering, convenience is provided for usage and maintenance work of the structure, maintenance cost is lowered, occurrence of a catastrophic event is forecasted, and loss is lowered to the minimum.

Description

technical field [0001] The invention relates to the technical field of connection structure fault diagnosis, in particular to a method for diagnosing loose connection structures based on multi-scale dynamic separation. Background technique [0002] Large complex structures are often composed of several components. Connections between components result in many discontinuous interfaces in the overall structure. During the whole service life of the structure, affected by the mechanical environment such as vibration, impact and creep, the fastening state of the connection interface will often change compared with the original design, and the phenomenon of pretightening force reduction, relative sliding or even loosening will appear. Changes in the connection state will affect the mechanical properties of the overall structure, resulting in weak links in local stiffness, which seriously endanger the functionality and safety of the structure. At present, there are many monitorin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06F17/30
Inventor 徐超黄晨晨杜飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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