Axial load decoupling method for high-strength bolts connecting blade roots of horizontal-axis wind turbines
A technology for wind turbines and high-strength bolts, applied in electrical digital data processing, measuring torque/torsion force, instruments, etc. during tightening, can solve problems such as low precision, high cost, and low safety, and achieve feasibility and simplification The effect of the work and the way to reduce the introduction of errors
Active Publication Date: 2021-08-10
华能威宁风力发电有限公司 +1
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[0010] The purpose of the present invention is to provide a method for decoupling the axial force load of the high-strength bolt connecting the blade root of the variable-speed and variable-pitch type horizontal-axis wind turbine, which solves the problem of the axial force of the high-strength bolt connected to the blade root of the existing variable-speed and variable-pitch horizontal-axis wind turbine The problems of high cost, low precision and low security in the load decoupling method
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[0031] The present invention will be further described in detail below.
[0032] The present invention provides a method for decoupling the axial force and load of high-strength bolts connected to the blade root of a variable-speed and variable-pitch horizontal-axis wind turbine, comprising the following steps:
[0033] Step 1, under the normal operation of the test unit, through the adjustment of the control system, the wind rotor is feathered and idling, and the mechanical brake system does not participate in the work all the time. n ~t n+m During the time period, the axial force data of each high-strength bolt connected to the blade root is collected at a sampling frequency of F, and the time-domain results of m sets of axial force data of each high-strength bolt are obtained;
[0034] Due to the loss of power source of the wind wheel, the rotation speed will slowly decrease under the influence of air resistance; during the slow-down rotation process of the wind wheel, sel...
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The invention provides a method for decoupling the axial force load of the high-strength bolt connecting the blade root of the variable-speed and variable-pitch horizontal-axis wind turbine generator set, comprising the following steps: Step 1, when the wind rotor of the test set is feathering idling and the mechanical brake system is closed , at t n ~t n+m During the period of time, with the sampling frequency of F, the axial force data of each high-strength bolt connected to the blade root is collected, and the time-domain results of m groups of axial force data of each high-strength bolt are obtained; The time-domain results of the axial force data of group m of high-strength bolts are used to calculate the bolt pre-tightening force of each high-strength bolt; step 3, under the normal operation of the test unit, the measured axial force data of each high-strength bolt connected to the blade root is collected; Step 4, using the measured axial force data obtained in step 3 and the bolt pretightening force obtained in step 2 to calculate the blade root section load component; the method provided by the present invention effectively saves the test cost, effectively simplifies the work of the test design link, and reduces The way to introduce errors.
Description
technical field [0001] The invention relates to a high-strength bolt connected to a blade root of a wind power generator set, in particular to a decoupling method for axial force and load of a high-strength bolt connected to a blade root of a variable-speed and pitch-variable horizontal axis wind power generator set. Background technique [0002] With the development trend of large-scale and lightweight single-unit capacity of variable-speed and variable-pitch horizontal-axis wind turbines, the design and manufacturing technology of blades has made significant progress, with increased length, increased power, reduced weight, reduced safety margins, and high-strength blade root connections. The load that the bolt needs to bear also increases correspondingly, and the safety risk increases. Considering the actual needs of safety monitoring, especially for remote onshore wind farms or offshore wind farms, the monitoring of actual bolt safety and operating status is particularly ...
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IPC IPC(8): G01L5/24G06F30/20G06F119/14
CPCG01L5/24
Inventor 郑磊张波闫姝王光文曹庆伟马玉刚谭光道李义军吴忠伟徐超孟秀俊朱玉瑞胡辉
Owner 华能威宁风力发电有限公司