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A method for on-site damage monitoring and identification of wind turbine blades

A wind turbine blade and damage monitoring technology, applied in the testing of mechanical parts, the testing of machine/structural parts, measuring devices, etc., can solve problems such as difficulty in operation and difficulty in finding tiny defects of blades, reduce the number of points and realize real-time Monitoring and evaluation, safeguarding the effect of discovery and determination

Active Publication Date: 2017-11-14
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Simple manual inspection is not only difficult to operate, but also difficult to find the small internal defects of the blades

Method used

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific examples.

[0034] In this embodiment, taking the current mainstream MW-level wind turbine blades as an example, the following steps are used for on-site monitoring of the blades:

[0035] 1) Determine the location where the blade structure is prone to damage.

[0036] Based on the blade strength and fatigue calculation report, as well as the structural test report of the full-scale blade, the 10 weakest structural positions were selected.

[0037] 2) Install and paste strain gauges at the determined weak positions. In view of the harsh operating environment of wind power blades, install the strain gauges inside the blades and connect them to the outside through cables;

[0038] 3) After the blade is hung up, install a data acquisition instrument for strain measurement at the hub of...

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Abstract

The invention discloses an on-site damage monitoring and recognition method for a wind turbine blade. Aiming at the on-site operation conditions of the wind turbine blade, the method carries out the on-line monitoring and recognition of the defects of the wind turbine blade. The objective of the invention lies in providing the on-site monitoring technology, and the method achieves the timely discovering and recognition of the cracks which are possibly caused by internal and external factors when the blade is in operation. The method is characterized in that a damage part, a peripheral local region and the mechanical properties will change to some extent before and after the damage happens when a blade structure generates cracks because of external environment factors and a structural factor, thereby enabling the proportional relation between a structural strain level of the damage part and peripheral local region and a wind load to change to some extent. Therefore, the method achieves the recognition of the damage condition of the blade through the on-line monitoring of the relation between the strain of a weak part of the blade structure and the wind load.

Description

technical field [0001] The invention relates to the technical field of wind power generation in the machinery industry, in particular to a method for monitoring and identifying damage on site of wind turbine blades. Background technique [0002] Wind turbine blade damage is an important concern in the operation of wind turbine blades. In the design of wind power blades, it is generally required that the wind power blades can meet the service life of 20 years. However, in actual field operation, the operating characteristics of wind turbines under unsteady loads make them prone to damage, which seriously affects the reliability and service life of wind turbines in safe operation. Once the blade is partially damaged, it may extend to the damage of the whole blade. If it is not handled in time, it may even affect the safety of the entire unit. On the contrary, if a small damage occurs in a part of the blade, it can be found in time and the damaged part can be treated in time,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 石可重李苏威廖猜猜徐建中
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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