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: 2012-12-12
ZHUZHOU TIMES NEW MATERIALS TECH
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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
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[0008] The present invention will be further described below in conjunction with specific embodiments and drawings.
[0009] Attached figure 1 The principle of a device for loading fatigue of wind turbine blades by rotating eccentric mass is given. It can be seen from the drawings that the present invention is a method for controlling the rotating eccentric mass and load of wind turbine blade fatigue test. Natural frequency and damping are calculated or measured by calculating or measuring the static displacement of the wind turbine blade under the design fatigue load, and using this displacement value as the blade fatigue vibration amplitude to predict the size of the rotating eccentric mass of the blade subjected to the fatigue load, 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 position to ensure that the fatigue load meets the set requirements. ...
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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 product test method, in particular to a method for loading and controlling the fatigue test of wind turbine blades applied to the rotating eccentric mass. The method can estimate the rotating eccentricity by determining the natural frequency and damping of the blade. The size of the mass and the speed of the motor ensure the safety and controllability of the wind turbine blade in the fatigue test and ensure that the load amplitude of the wind turbine blade remains unchanged during the fatigue test. Background technique [0002] At present, the rotating eccentric mass loading method is widely used in the fatigue test of wind turbine blades in my country. It fixes the motor device on the wind turbine blade. When the motor is working, the rotor drives the eccentric mass to rotate, causing the motor to generate simple harmonic motion and drive the blade and the motor to perform simple harmonic motion together. The frequency of the mo...
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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