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

A technology for wind turbine blades and fatigue damage, which is applied in the testing of mechanical components, testing of machine/structural components, and measuring devices. The effect of economical equipment investment and avoiding analysis errors

Active Publication Date: 2012-07-25
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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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 shortening the detection cycle, most of the current purposes are to detect whether fatigue damage occurs to the blade within a certain design cycle (that is, within a certain fatig

Method used

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

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0029] In this embodiment, taking the current mainstream MW wind turbine blades as an example, the following steps are used for detection and result correction:

[0030] 1) According to the blade fatigue load spectrum provided by the design department, determine the load amplitude and mean value of the fatigue loads that should be included in the evaluation analysis. In this example, select 7 load items that play a major role in the fatigue load spectrum to carry out follow-up assessment;

[0031] 2) Fix the blade on the blade test bench, and set strain gauges on the surface and inside of the blade. In this example, the number of sensors is 50, and the layout position covers the fatigue risk occurrence position of the bla...

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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 machinery industry, in particular to a fatigue damage and life evaluation method for 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 mate...

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Application Information

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IPC IPC(8): G01M13/00G01N3/00
Inventor 石可重赵晓路徐建中
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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