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Method for controlling rotation eccentricity mass and load during wind turbine blade fatigue test

A wind turbine blade and fatigue test technology, which is applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., can solve the problem of difficulty in estimating the size of the rotating mass, the inability to ensure the consistency of the load range of wind turbine blades, and blade fatigue. The load is difficult to control and other problems, to achieve the effect of ensuring accuracy and scientificity

Active Publication Date: 2011-08-17
ZHUZHOU TIMES NEW MATERIALS TECH
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AI Technical Summary

Problems solved by technology

[0003] In order to overcome the difficulty of estimating the size of the rotating mass in the existing wind turbine blade fatigue test method, the difficulty of controlling the fatigue load of the blade and the inability to ensure the consistency of the load amplitude of the wind turbine blade during the fatigue test

Method used

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  • Method for controlling rotation eccentricity mass and load during wind turbine blade fatigue test
  • Method for controlling rotation eccentricity mass and load during wind turbine blade fatigue test
  • Method for controlling rotation eccentricity mass and load during wind turbine blade fatigue test

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Embodiment Construction

[0008] The present invention will be further described below in conjunction with specific embodiment and accompanying drawing,

[0009] attached figure 1 The principle of a rotating eccentric mass to the wind turbine blade fatigue loading device is given. It can be seen from the accompanying drawings that the present invention is a method for controlling the rotating eccentric mass and load of the wind turbine blade fatigue test, and the blade is measured by the free vibration method. Natural frequency and damping, by calculating or measuring the static displacement of the wind turbine blades under the design fatigue load, and using this displacement value as the fatigue vibration amplitude of the blades to predict the size of the rotating eccentric mass of the fatigue load applied to the blades, through a certain method The load control is converted into equivalent displacement change control, and the displacement sensor is used to monitor the displacement of the loading posi...

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Abstract

The invention relates to a method for loading a fatigue load during a wind turbine blade fatigue test. The rotation eccentricity mass which applies the fatigue load to blades is predicted by adopting a certain method through testing the natural frequency and the damping of the blades by adopting a free vibration method, the load control is converted to the displacement change control by adopting a certain method, the displacement of a loading position is monitored by adopting a displacement sensor to ensure that the fatigue load meets the set requirement, the natural frequency and the dampingof the blades are retested at regular intervals and the rotation speed and the rotation mass of a motor are readjusted during the wind turbine blade fatigue test, and the load amplitude is kept unchanged by adopting the displacement sensor. If the displacement monitoring does not meet the design requirement, the rotation mass needs to be adjusted until the displacement monitoring meets the designrequirement. In the invention, the rotation speed and the rotation mass of the blade fatigue loading motor can be designed firstly, the load amplitude can be kept unchanged during the wind turbine blade fatigue test, and the wind turbine blade fatigue test can be effectively ensured to be accurate and scientific.

Description

technical field [0001] The invention belongs to a test method of a product, in particular to a method for loading and load control of a fatigue test applied to a wind turbine blade by a rotating eccentric mass. The size of the mass and the speed of the motor ensure the safety and controllability of the wind turbine blades in the fatigue test and ensure that the load amplitude of the wind turbine blades remains unchanged during the fatigue test. Background technique [0002] At present, the rotating eccentric mass loading method has been widely used in the fatigue tests of wind turbine blades in my country. It is to fix the motor device on the blade of the wind turbine. When the motor is working, the rotor drives the eccentric mass to rotate, causing the motor to generate simple harmonic vibration and driving the blade and the motor to perform simple harmonic vibration. The frequency of the motor is close to the natural frequency of the blade, and the blade resonates and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00
Inventor 靳交通彭超义潘利剑冯学斌曾竞成肖加余
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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