A wind turbine blade condition monitoring method and system based on vibration detection and wireless signal transmission

Abstract

The invention provides a wind turbine blade state monitoring method and system based on vibration detection and wireless signal transmission. The method comprises the steps that S1, vibration acceleration signals of a wind turbine blade are detected and acquired; S2, the actual low-order modal frequency of the blade is calculated by the use of the acquired vibration acceleration signals of the blade; S3, the difference between the square of the actual low-order modal frequency of the blade and the square of the modal frequency of a new unit under the same operating condition in the process that the new unit is put into operation is calculated; S4, the relative variation of the modal stiffness of the blade swing direction is obtained by the use of the relative variation of the difference of the squares of the modal frequencies; and S5, the service life loss rate of a blade material is obtained by the use of the relative variation of the modal stiffness of the blade swing direction. The system is used for carrying out the method. The wind turbine blade state monitoring method and system based on vibration detection and wireless signal transmission have the advantages of being simple in principle, easy to implement, lossless and dynamic and being capable of carrying out real-time monitoring.

Description

technical field [0001] The invention mainly relates to the field of wind power generation equipment, in particular to a wind turbine blade state monitoring method and system based on vibration detection and wireless signal transmission, mainly based on blade modal frequency changes to complete online monitoring of blade material life loss. Background technique [0002] The capacity of a single unit of wind turbines continues to grow, so online monitoring of its equipment has become particularly important. Among them, the blade is the most vulnerable part of the whole wind turbine, and the cost accounts for about 15%-20% of the total cost of the wind turbine, so the online monitoring of the life loss and remaining life of the wind turbine blade material is very necessary . Most of the materials of wind turbine blades are resin-based composite materials. Once the blades are put into operation, under the influence and action of various external factors and loads, the blade mat...

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Problems solved by technology

Under cyclic stress, as the number of cycles increases, the stiffness of the material decreases and the strength decreases

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