SH guided wave detection method and device for bolt looseness detection

A technology of loose connection and detection method, which is applied in the direction of measuring device, geophysical measurement, seismology, etc., to achieve the effect of low cost, improved reliability and practicability, and small size

Active Publication Date: 2021-06-22
PIPECHINA SOUTH CHINA CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, there is a lack of a method in the prior art that can realize the bolt loosening of the bolt group based on the SH guided wave excited by the magnetostrictive transducer. Methods of detection and monitoring

Method used

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  • SH guided wave detection method and device for bolt looseness detection
  • SH guided wave detection method and device for bolt looseness detection
  • SH guided wave detection method and device for bolt looseness detection

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with drawings and embodiments.

[0048] Such as figure 1 As shown, the device includes an excitation transducer 4, a reference receiving transducer 5, a propagation receiving transducer 2 and a guided wave detector. The two plates 1 are connected by a bolt group 3, and the excitation transducers are arranged on the two plates 1. Transducer 4, reference receiving transducer 5 and propagation receiving transducer 2, excitation transducer 4 is arranged close to the bolt group 3, reference receiving transducer 5 and propagation receiving transducer 2 are located at the excitation transducer 4, and the reference receiving transducer 5 and the propagation receiving transducer 2 are respectively arranged on two plates 1, and the excitation transducer 4 and the reference receiving transducer 5 are arranged on the same plate 1; the excitation transducer The transducer 4, the reference receiving transducer 5 an...

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Abstract

The invention discloses an SH guided wave detection method and device for bolt looseness detection. Processing is performed to obtain the guided wave frequency dispersion characteristic of the flat plate. The surface of the flat plate connected with the bolt group is coupled with three transducers, one transducer excites two guided waves, the two transducers receive guided wave signals, the distance between transmitting and receiving is calculated, the guided wave propagation time is obtained according to the distance and the wave velocity, and the energy calculation time interval is set in combination with the time interval; an energy characteristic value in a calculation time interval is calculated, a quantitative value of looseness of the bolt group is calculated, the quantitative value is compared with a quantitative value under initial bolt group connection to obtain a percentage parameter, and looseness is detected according to the percentage parameter. According to the invention, rapid detection and long-time monitoring of the connecting piece are realized, the device is suitable for detection of the connection condition of bolt groups with different bolt numbers, the transducer is not only simple but also reasonable in design, long-time bolt looseness monitoring can be realized, and monitoring of the flat plate connecting piece which is provided with a surface coating and works for a long time is also very effective.

Description

technical field [0001] The invention relates to a non-destructive detection method and device for bolt connection looseness, in particular to a SH guided wave-based detection method and device for bolt looseness of a bolt group, belonging to the technical field of non-destructive detection. Background technique [0002] As a commonly used mechanical connection method, bolt connection is widely used in bridges, railways and mechanical equipment assembly due to its simple connection method, high connection strength and reliable connection. However, during the working process, the bolts often encounter vibration and shock, and the bolted connection is usually in a tension state during work, so it will loosen after a period of work. If the bolt looseness is not solved and tightened in time, it will lead to serious and vicious accidents such as bolt breakage and bolt group connection failure, which will bring great loss of personnel and property. For example, bolt looseness is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/00
CPCG01V1/00
Inventor 田中山杨昌群牛道东李育特王现中张梦茹唐志峰陈会明
Owner PIPECHINA SOUTH CHINA CO
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