A method for three-dimensional deformation sensing and health assessment of a wind turbine blade in service

By using a binocular stereo vision measurement device and coordinate system transformation technology, the problem of measuring three-dimensional dynamic deformation during the rotation of wind turbine blades has been solved, realizing non-contact three-dimensional deformation decoupled measurement and health assessment, and providing a graded assessment of blade structure.

CN122670736BActive Publication Date: 2026-10-09SHANDONG UNIV OF TECH
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Patent Information

Application Number
CN202611185249.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-08-06
Publication Date
2026-10-09
Estimated Expiration
2046-08-06

AI Technical Summary

Technical Problem

Existing technologies make it difficult to achieve large-scale, multi-position three-dimensional dynamic deformation measurement of wind turbine blades during rotation. Furthermore, traditional monitoring methods cannot effectively reflect changes in the overall structural stiffness of the blade and the coupled deformation of flapping, oscillation, and torsion of the blade under rotation.

Method used

Using a binocular stereo vision measurement device, a center marker point is set at the center of the wind turbine hub, and marker points are set on the blades and speckle areas are sprayed. The transformation relationship between the blade reference coordinate system and the camera coordinate system is established, so as to realize non-contact synchronous decoupled measurement of the flapping, oscillation and torsional deformation of the blades, and a health index is constructed for structural health assessment.

Benefits of technology

It enables non-contact, large-scale, multi-position three-dimensional deformation measurement of wind turbine blades under rotation, accurately reflects the changes in the overall structural stiffness of the blade, provides a graded assessment of the blade's health status, locates weak points, and reflects the degree of overall performance degradation.

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Abstract

The present application belongs to the technical field of wind turbine blade deformation and structural state monitoring, and particularly relates to a method for three-dimensional deformation sensing and health assessment of a wind turbine blade in service, comprising the following steps: setting a center marker at the center of the hub of a wind turbine, setting a plurality of markers on each blade, setting a speckle area, and arranging a binocular stereo vision measuring device; obtaining reference geometric state parameters under a wind load-free reference state, and establishing a correspondence relationship between the same speckle feature points under the wind load-free reference state and the motion state; traversing all matched speckle feature points to obtain continuous torsional deformation fields, flapping deformation fields and edgewise deformation fields on the blade surface; constructing a comprehensive local damage index, and further constructing a global comprehensive health index to perform a graded assessment on the health state of the blade structure. The present application uses binocular stereo vision to non-contact and synchronously decouple measure the three-way deformation of a rotating blade in the flapping, edgewise and torsional directions, and constructs a health index to realize a graded assessment on the health of the blade structure.
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