Bolt group looseness detection method and system based on computer-aided analysis

A computer-aided detection method technology, applied in the monitoring of machines/engines, wind turbines, engines, etc., can solve the problems of missing bolts, missed inspections, and failure to cover bolts, etc., to avoid the possibility of missed inspections and reduce costs Effect

Active Publication Date: 2021-06-18
浙江中自庆安新能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] So far, there are various stress detection methods for bolts, but there are still problems. Most of the bolt detection methods in the prior art are aimed at a single specific bolt. In the scene with multiple bolts, the existing technology cannot cover all the bolts. There is a possibility of missed detection
Therefore, it is necessary to propose a technical solution to solve the problem that the above-mentioned bolts may be missed

Method used

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  • Bolt group looseness detection method and system based on computer-aided analysis

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Embodiment approach

[0072] As an exemplary embodiment, the present invention uses an ultrasonic acoustic time difference method to detect bolt stress, and the stress detection device is an ultrasonic stress measurement device, which converts bolt stress into acoustic time difference, but it should be known that Other methods can be used to measure bolt stress, such as force measuring wrench, strain gauge, image deformation monitoring, etc.

[0073] According to the azimuth angle of the incoming wind speed β The value is β wind , rated wind speed u set Bolts calculated by extrapolation N Correct the actual bolt stress data measured by the stress measuring device to obtain the azimuth angle of incoming wind speed under the condition of rated wind speed β The value is β wind When the bolt stress correction data.

[0074] Due to the different forms of bolt stress measured by different stress measuring devices, the means of correcting the actual bolt stress data measured by the stress measurin...

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Abstract

A bolt group looseness detection method based on computer-aided analysis comprises the following steps: S1, establishing a finite element model about a tower flange, and constructing a stress relation curve between an incoming flow wind speed azimuth angle and any bolt; S2, arranging a stress measurement point on the tower drum flange every n bolts, arranging a bolt detection area between every two adjacent stress measurement points, detecting and correcting actual bolt stress data of the bolts at the stress measurement points, and obtaining bolt stress correction data; S3, performing feature extraction on the bolt stress correction data of all the stress measurement points to obtain feature values of all the bolt detection areas; S4, determining an area where the damaged bolt is located by comparing the feature values; and S5, determining the position of the damaged bolt according to the size of the bolt stress correction data obtained by the two stress measurement points corresponding to the area where the damaged bolt is located and the size relation of the two pieces of bolt stress correction data.

Description

technical field [0001] The invention relates to the technical field of computer-aided optimization, in particular to a method and system for detecting looseness of a bolt group based on computer-aided analysis. Background technique [0002] At present, the connection of various components of wind turbines is generally connected by high-strength bolts, such as the connection between the blade and the hub, the connection between the hub and the main shaft, the connection between the tower shell, etc., in the entire life cycle of the wind turbine for 20 years -In the past 30 years, local bolt fractures caused by alternating loads caused by variable winds and uncertainties have occurred from time to time. Causing serious accidents such as unit collapse. During the normal operation of wind turbines, the inspection cycle of high-strength bolts is generally half a year to one year. The interval between inspection cycles is long, and loose or broken bolts cannot be found in time, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23F03D17/00
CPCF03D17/00G06F30/23
Inventor 水沛尹旭晔
Owner 浙江中自庆安新能源技术有限公司
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