Fatigue test method of wind driven generator blade

A technology for wind turbines and fatigue testing, which is applied in the monitoring of wind turbines, the testing of wind turbines and mechanical components, etc., can solve the problems of long testing time, expensive testing equipment, and the need for a fixed site, so as to reduce the cost of testing and testing. The effect of reducing the test cycle and the small equipment used for testing

Active Publication Date: 2017-05-31
SHANGHAI GHREPOWER GREEN ENERGY
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AI Technical Summary

Problems solved by technology

Existing fatigue test methods have many deficiencies: 1. The space requirements are large, which is not applicable to small and medium-sized wind turbines; 2. The test equipment is relatively expensive; 3. The site needs to be fixed and cannot be moved; 4. The motor power requirements are comparative High; 5. High power consumption; 6. Long test time

Method used

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  • Fatigue test method of wind driven generator blade
  • Fatigue test method of wind driven generator blade

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Embodiment Construction

[0016] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0017] The invention first utilizes the principle of resonance to amplify the excitation load to save power input. Secondly, the method of increasing the fatigue test load is used to shorten the test cycle and save test time. Thirdly, the relationship between the test load and the displacement is obtained through the static tensile test, so that the test load can be obtained by directly measuring the displacement in the fatigue test experiment. Finally, the number of test loads of the blade is recorded, and compared with the number of loads calculated within the design life of the blade, the fatigue life of the blade can be obtained.

[0018] combine figure 1 and figure 2 , specifically, the fatigue testing method of a kind of wind generator blade provided by the present invention, comprises the following steps:

[0019] The ...

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Abstract

The invention relates to a fatigue test method of a wind driven generator blade. The method is characterized by comprising the following steps: the blade to be tested is connected with a hub through a connecting flange, the hub is fixed to a support, and then the static load test is performed; a motor with a frequency converter is connected with an eccentric wheel through a speed reducer, and therefore a shock excitation loading device is combined and is fixed to the blade, the blade generates resonance, the blade vibration frequency is obtained, and if the blade is not damaged within the required vibration frequency, the blade has the enough fatigue strength. The method has the beneficial effects that the blade test efficiency is improved, the experiment test period is shortened, the occupied space is not large, equipment for testing is small, the experiment test cost is reduced, the power cost requirement is small, the experiment position can be moved, and the fixed site is not required to be occupied.

Description

technical field [0001] The invention relates to a fatigue testing method for wind power generator blades. Background technique [0002] With the rapid development of social economy, people's demand for energy is increasing day by day, and the resulting environmental pollution is also increasing day by day. Wind energy is a clean and renewable energy, so wind power generators are attracting more and more attention and applications from all over the world. [0003] The blade is the key medium for using wind energy to drive the generator to rotate, and the strength of the blade directly affects the safety performance of the wind turbine. Wind turbine blades are very important for wind turbines. Fatigue testing of wind turbine blades is a necessary process for wind turbine evaluation. [0004] At present, the fatigue strength is often simulated and analyzed by the finite element method, but the error is often large. Fatigue experimental tests are often applied to assess blad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D17/00G01M13/00
CPCG01M13/00
Inventor 朱文雯蒋作平刘金鹏周绍君
Owner SHANGHAI GHREPOWER GREEN ENERGY
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