Loose bolt position positioning method and system based on average Mahalanobis distance

A technology of Mahalanobis distance and positioning method, which is applied in the direction of measuring device, testing of mechanical components, testing of machine/structural components, etc. It can solve the problems of low efficiency, heavy workload of loosening bolts, etc., achieve simple operation and reduce troubleshooting work Quantity, easy-to-achieve effect

Active Publication Date: 2021-02-26
HUNAN UNIV OF SCI & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method and system for locating the position of loose bolts based on the average Mahalanobis distance, so as to solve the problem of heavy workload and low efficiency of relying on manual inspection of loose bolts

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  • Loose bolt position positioning method and system based on average Mahalanobis distance
  • Loose bolt position positioning method and system based on average Mahalanobis distance

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Embodiment Construction

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] The purpose of the present invention is to provide a method and system for locating the position of loose bolts based on the average Mahalanobis distance, which can reduce the workload of manual inspection and improve the efficiency of inspection.

[0047] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompa...

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Abstract

The invention relates to a loose bolt position positioning method and system based on an average Mahalanobis distance. The loose bolt position positioning method comprises the steps of: spraying speckle points on a bolt connecting structure, and determining the speckle points at all bolt positions; under the same working condition, acquiring a loosening-free vibration displacement response signaland a loosening vibration displacement response signal by using a machine vision measurement method; calculating an average Mahalanobis distance of the vibration displacement response signals at all the speckle points before and after bolt loosening according to the loosening-free vibration displacement response signal and the loosening vibration displacement response signal; performing normalization processing on the average Mahalanobis distance, and determining the average Mahalanobis distance after normalization processing; and determining the position of the loose bolt according to the normalized average Mahalanobis distance. By adopting the loose bolt position positioning method and system provided by the invention, the workload of manual troubleshooting can be reduced, and the troubleshooting efficiency can be improved.

Description

technical field [0001] The invention relates to the field of location positioning of loose bolts, in particular to a method and system for location location of loose bolts based on the average Mahalanobis distance. Background technique [0002] Bolt connection is widely used in various structural connections due to its advantages of convenient disassembly and low cost. During the operation of the equipment, the bolted connection structure is inevitably affected by the excitation of the external environment, especially when the external excitation frequency is the same as or close to a certain order frequency or several modal frequencies of the structure, resonance is prone to occur and the bolt connection occurs. loose. In large-scale equipment, more bolts are widely used in its structure, and it is of great significance to accurately find out the position of loose bolts among the many bolts for the health maintenance of the equipment structure. However, the existing loose...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G01L5/24
CPCG01M13/00
Inventor 伍济钢邵俊杨天龙成远杜义贤王刚
Owner HUNAN UNIV OF SCI & TECH
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