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Method for detecting fatigue damage of blade of horizontal axis wind turbine

A wind turbine blade and fatigue detection technology, which is applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., can solve problems such as failure to obtain the fatigue performance of blades, and meet the low requirements for testing equipment and the environment. Conditional requirements, the effect of reducing testing costs

Active Publication Date: 2013-07-31
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as mentioned above, uniaxial fatigue testing cannot obtain accurate fatigue performance of blades

Method used

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  • Method for detecting fatigue damage of blade of horizontal axis wind turbine
  • Method for detecting fatigue damage of blade of horizontal axis wind turbine
  • Method for detecting fatigue damage of blade of horizontal axis wind turbine

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Embodiment Construction

[0037] 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.

[0038] In this embodiment, taking the current mainstream MW wind turbine blades as an example, the following steps are used for detection and result correction:

[0039] 1) if figure 1 , figure 2 As shown, using the existing general blade uniaxial fatigue detection method, the fatigue loads (F1) and (F2) are applied to the blade flapping and shimmy directions respectively, and the fatigue detection is carried out to obtain the fatigue performance in the two cases;

[0040] 2) Using the linear damage accumulation theory, the results obtained in 1) are processed to obtain the fatigue performance of the blade under the sequential action of the above two loads;

[0041] 3) Using the numerical simulation method to evaluate...

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Abstract

The invention discloses a method for a fatigue detection of a blade of a horizontal axis wind turbine. The method comprises the following steps of: processing a result obtained by conventional general single-shaft fatigue detection by adopting the linear damage accumulation theory to obtain fatigue performance of the blade under the interaction of loads in the swinging and shimmying directions; respectively calculating the fatigue lives of two single shafts by adopting a numerical simulation method, and performing damage accumulation on the two calculation results; performing calculation by adopting a numerical method to obtain fatigue performance under the condition that double shafts are simultaneously loaded; and analyzing and comparing fatigue parameters acquired by two fatigue damage calculations during single-shaft loading and double-shaft simultaneous loading, establishing a mathematic relation among single-shaft loading, damage accumulation calculation and double-shaft loading calculation results, introducing the mathematic relation into a single-shaft fatigue test of the blade, and correcting the test result to obtain a double-shaft fatigue performance. The purpose of obtaining more accurate fatigue performance of the blade is fulfilled by adopting low-cost single-shaft fatigue detection means through correction.

Description

technical field [0001] The invention relates to the technical field of wind power generation in the machinery industry, in particular to a fatigue detection 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 materials, and involv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00G06F19/00
Inventor 石可重赵晓路徐建中
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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