Calculation method for ultimate strength and fatigue strength of yaw bearing connecting bolt of wind turbine

A technology for yaw bearings and connecting bolts, which is applied in calculations, special data processing applications, instruments, etc., can solve the problems of incomplete load transmission path of yaw bearing connecting bolts of wind turbines, inaccurate calculation of strength performance, etc., to improve safety , the effect of enhancing the accuracy

Inactive Publication Date: 2015-11-04
XUJI GRP +2
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, and propose a calculation method for the ultimate strength of the connecting bolts of the fan yaw bearing, w

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  • Calculation method for ultimate strength and fatigue strength of yaw bearing connecting bolt of wind turbine
  • Calculation method for ultimate strength and fatigue strength of yaw bearing connecting bolt of wind turbine
  • Calculation method for ultimate strength and fatigue strength of yaw bearing connecting bolt of wind turbine

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Embodiment Construction

[0028] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0029] Example of calculation method for ultimate strength of wind turbine yaw bearing connection bolts:

[0030] 1) if Figure 1-3 As shown, on the drawing software (such as CAD), the gearbox case 1, main frame 2, yaw bearing inner ring 3, yaw bearing outer ring 4, brake disc 5, brake pad 6, tower top flange 7. Tower tube 8. Gearbox main shaft bearing 1 9. Gearbox main shaft bearing 2 10. Load parachute 11. Yaw bearing and main frame connecting bolt 12. Yaw bearing and tower top flange connecting bolt 13. Yaw bearing ball 14. Yaw gearbox 15. Establish a geometric model for elastic bearings. Use finite element software to divide the meshes of the above components using solid elements and assemble them to establish a finite element model. The load transfer path of the model is complete and consistent with the actual situation .

[0031] Among them, the gear box and...

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Abstract

The invention relates to a calculation method for ultimate strength and fatigue strength of a yaw bearing connecting bolt of a wind turbine. Mesh generation and assembling are separately performed on three-dimensional geometrical models of devices on a load transfer path related to the bolt by use of finite element software, so as to establish a finite element model, so that the load transfer path is completed and is consistent with the reality. The devices on the load transfer path at least comprise a gear box body, a main frame, a tower drum, a yaw bearing and a yaw bearing connecting bolt. Limit loads of different working conditions are applied to the models, and the models are submitted to finite element analysis software to be solved, so as to obtain the ultimate strength and fatigue strength of the yaw bearing connecting bolt of the wind turbine. Through adoption of the method, the complete load transfer path is realized, the accuracy of bolt security coefficient is improved, and the operation reliability of the wind turbine is improved.

Description

technical field [0001] The invention relates to a calculation method for connecting bolts between a yaw bearing of a wind turbine and a main frame and a tower top flange, and belongs to an analysis method involving the strength performance of large-scale structural bolts of a wind turbine. Background technique [0002] The yaw bearing is one of the important components of the wind turbine. When the external wind conditions change, the motor will drive the nacelle to yaw through the yaw bearing. Therefore, the connecting bolt of the yaw bearing is the most important connecting bolt of the wind turbine, and the accuracy of its strength performance determines the safety of the entire wind turbine. [0003] In the prior art about the safety performance evaluation of yaw bearing connecting bolts, some conventional engineering calculation methods are difficult to achieve the accuracy required by actual engineering. Therefore, the finite element analysis method can be used to calc...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 齐涛董姝言苏凤宇晁冠良何海建程林志史航
Owner XUJI GRP
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