Evaluation method for fatigue damage and service life of horizontal axis wind turbine blade

Abstract

The invention discloses a test method for the fatigue damage and the service life of a horizontal axis wind turbine blade, aiming to obtain a more exact blade fatigue performance parameter by adopting a test detection and computational analysis means having low cost and high efficiency so as to meet the requirements of blade design, research and development and detection. The method is characterized in that on the basis of the characteristic that the impeller speed of a horizontal axis wind turbine is lower, and the period change frequency of various fatigue loads is also lower, a series of steps of carrying out static loading testing on the wind turbine blade to obtain a stress / strain amplitude distribution condition under the effect of various fatigue loads and analyzing by combining a material property curve and a cumulative damage theory are adopted to realize the evaluation to the blade fatigue performance. Compared with the traditional horizontal axis wind turbine blade fatigue testing technology, the method has the advantages of short period, low cost, capability of obtaining a final service life parameter of the blade, and the like.

Description

technical field [0001] The invention relates to the technical field of wind power generation in the mechanical industry, in particular to a method for testing fatigue damage and life of horizontal axis wind turbine blades. Background technique [0002] Fatigue damage of wind turbine blades is an important concern in the design, manufacture and 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. The operating characteristics of wind turbines under unsteady loads make them prone to fatigue damage, which seriously affects the reliability and service life of wind turbines in safe operation. The harsh working environment, special material properties, and various problems caused by structure and technology have brought considerable difficulty to blade life assessment. Fatigue research on wind turbine blades covers many aspects such as environment, load, structure, and mat...

AI Technical Summary

Problems solved by technology

[0004] However, most of the current blade fatigue detection methods have a long cycle and high cost, and most of them use equivalent load and accelerated test methods to detect time, and these methods may lead to deviations in experimental results

Also due to the reason of shortening the detection cycle, most of the current purposes are to detect whether the blade has fatigue damage within a certain design cycle (that is, within a certain fatigue load cycle range), rather than to detect the actual life of the blade damage. Therefore, The test results only reflect whether the blade can avoid fatigue damage during the design cycle, but cannot reflect the actual life of the blade

Therefore, it can be said that most of the current fatigue testing has the disadvantages of long testing period, high testing cost, and difficulty in obtaining the actual service life of blades.

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