Bolt state monitoring method and device

Abstract

The invention discloses a bolt state monitoring method and device. The bolt state monitoring method comprises the steps: the reference state of a bolt is evaluated; reference characteristic parametersof the bolt in the reference state are obtained, and the reference relation between the reference stress of the bolt in the reference state and the reference characteristic parameters is analyzed; loosening characteristic parameters of the bolt in the loosening state are obtained, and the loosening relation between the loosening stress of the bolt in the loosening state and the loosening characteristic parameters is analyzed; taking the stress in the reference state and the stress in the loosening state as samples, a preset monitoring model is trained, and a health model and a loosening modelare determined; and the operation stress of the to-be-detected bolt in an operation state is obtained, and the operation stress is matched with the health model and the loosening model. According tothe bolt state monitoring method and device, measurement of the bolt length and the longitudinal and transverse wave propagation characteristics in the original zero-stress state is avoided, online monitoring is achieved to a large extent, and the defect of manual inspection is overcome.

Description

technical field [0001] The invention relates to the technical field of structural health monitoring and fault diagnosis of a transmission tower line system, in particular to a method and device for monitoring the state of transmission tower bolts based on longitudinal and transverse wave axial stress detection and modeling technology. Background technique [0002] For the long-span transmission tower line system structure, under the action of wind load, the structure is prone to breeze vibration, which will cause fretting fatigue to the tower line bolt connection structure, reduce the connection stiffness, and endanger the safe operation of the transmission tower line system. Therefore, it is of great engineering significance to select the loose state of the bolted connection structure of the transmission tower for on-line monitoring. [0003] It is difficult to detect the loose bolts of transmission towers by traditional damage monitoring methods in advance. The existing mo...

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Problems solved by technology

[0003] It is difficult to detect the loose bolts of transmission towers by traditional damage monitoring methods in advance. The existing monitoring methods based on tower dynamic parameters (modal curvature, etc.) one of the puzzles

However, the existing integrated longitudinal and transverse wave measurement technology has high precision, but it needs to measure the original geometric parameters and wave propagation characteristics of the bolted connection structure under the zero stress state, and it is difficult to truly realize on-line monitoring.

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