Fan blade fatigue loading and gravity compensation device and test method thereof

Abstract

The invention provides a fan blade fatigue loading and gravity compensation device and a test method thereof, belonging to the field of a blade load simulation test device, and particularly relates to a fatigue loading and gravity compensation device for fan blades and a test method thereof. The fan blade fatigue loading and gravity compensation device comprises a fatigue loading device and a gravity compensation device, the fatigue loading device comprises a blade clamp (5), a power device and a fixing guide rail (1), the bottom of the power device is connected with the guide rail (1) which is fixedly arranged on the ground, the top part of the power device is hinged to the bottom of the blade clamp (5), one side of the fatigue loading device is provided with the gravity compensation device, and the external force loading end of the gravity compensation device is connected with the top part of the blade clamp (5). Firstly, the traditional installation and loading method of fixing the loading device on the surface of a blade loading point is changed, and the inherent properties of blades are maintained. Moreover, extra gravitational influence on the blades caused by a test device can be eliminated by the added gravity compensation device, thereby completely avoiding the defect of test data distortion resulting from installation of the test device.

Description

technical field [0001] The invention relates to a fatigue loading and gravity compensation device of a fan blade and a test method thereof, belonging to the field of blade load simulation test equipment, in particular to a fatigue loading test device of a four-cylinder driven wind turbine blade. Background technique [0002] The wind turbine blade fatigue loading test device is mainly used for the load simulation test of the wind turbine blade. The current technical solutions mainly have the following deficiencies: First, the fatigue loading test device is currently used to fix the blade loading point, and the blade is connected to the blade through a fixture. In the integrated structural scheme, the loading device is placed on the blade, which adds a large extra weight to the blade, changes the inherent characteristics of the blade, and easily causes distortion of the fatigue test data. [0003] Second, the current fatigue loading test device for wind turbine blades driven ...

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Problems solved by technology

[0002] The wind turbine blade fatigue loading test device is mainly used for the load simulation test of the wind turbine blade. The current technical solutions mainly have the following deficiencies: First, the fatigue loading test device is currently used to fix the blade loading point, and the blade is connected to the blade through a fixture. The integrated structural scheme, the loading device is placed on the blade, adding a large extra weight to the blade, changing the inherent characteristics of the blade, and easily causing distortion of the fatigue test data

[0003] Second, the current fatigue loading test device for wind turbine blades driven by hydraulic cylinders can only achieve uniaxial loading of the blades, that is, the blades are loaded in the facing and chord directions separately (the vibration at the upper and lower positions of the blade is considered as facing loading, and the vibration at the left and right positions is considered as chord direction). Loading) method, when the face-to-face loading is completed, first remove the fatigue loading device and fixture from the blade, then remove the blade from the cylindrical loading support, turn the blade 90 degrees, and then reinstall it on the fatigue loading support seat, and then install the blade clamp and fatigue loading device, which is very troublesome in engineering application

In addition, the fatigue loading device is installed on the blade, which adds an extra weight to the blade, and at the same time, there is no gravity compensation device, which exacerbates the inaccuracy of the experimental structure

[0004] Therefore, there is a large difference between the uniaxial loading method of the prior art and the actual stress condition of the blade, the test period is long, the test device is not suitable, and the test results are not ideal

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