Method and system for detecting local impedance change of objects

An object, to-be-detected technology, applied in the measurement of torque/torsional force during tightening, and the use of sonic/ultrasonic/infrasonic waves to analyze solids and other directions, can solve problems such as difficult defect detection, and achieve the effect of simple operation steps and easy-to-use equipment

Inactive Publication Date: 2012-07-18
TSINGHUA UNIV
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  • Abstract
  • Description
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Problems solved by technology

Each technology has its specific application range and advantages and disadvantages. It is difficult to detect all types of defects with a single method, and a combination of multiple methods is usually required

Method used

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  • Method and system for detecting local impedance change of objects
  • Method and system for detecting local impedance change of objects
  • Method and system for detecting local impedance change of objects

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0049]The equivalent stiffness and friction coefficient of bolts are not only related to material properties and geometric shapes, but also change with the tightening torque of bolts. The equivalent stiffness and damping of composite materials are not only related to the material properties and geometry of composite materials, but also related to the damage type and degree of composite materials. Therefore, to accurately describe the mechanical behavior of bolts or composite materials under the action of knocking force, very complex nonlinear dynamic analysis must be involved. The purpose of the present invention is to detect the degree of tightness of the bolt or the damage state of the composite material, so it is only trying to find a response that is sensitive to the tightening torque of the bolt or the damage state of the composite materia...

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Abstract

The invention discloses a method and a system for detecting local impedance change of objects based on controlled knocking and a classifier. Classification is carried out by that an object has different local impedances and different response signals after being knocked and by the combination with a pattern recognition method. The method and the system not only can be used for detecting bolt screwing moment, but also can be used for detecting the damage status of composite material. The device adopted by the method is simpler, the method is simple and practical, the detection result is accurate, and multiclass classification can be realized.

Description

technical field [0001] The present invention relates to a method and system for detecting local impedance changes of objects based on controlled tapping and a classifier, and more particularly to a method and system for detecting bolt tightness and detecting composite material damage based on controlled tapping and classifiers. Background technique [0002] All kinds of equipment often use bolts to realize the connection of parts. Although it is very common, its tightness will directly affect the quality of the entire equipment. If the bolts in some key parts loosen, it may even cause major safety accidents. In order to ensure the connection quality of bolts, it is necessary to use standard detection methods to determine the friction coefficient, maximum torque and other parameters of bolts. For some precision equipment, it is also necessary to strictly specify the tightening torque of bolts. Due to the influence of external factors such as vibration, shock, and temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/09G01L5/24
Inventor 向志海黄俊涛陆秋海
Owner TSINGHUA UNIV
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