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Bolt strength analysis method for directly-driven wind-driven generator

A technology of direct drive wind turbines and wind turbines, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of low simulation degree and poor accuracy of analysis results, and achieve great guiding significance and accurate analysis Effect

Active Publication Date: 2013-04-03
GUODIAN UNITED POWER TECH
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AI Technical Summary

Problems solved by technology

That is, the existing analysis method calculates the strength of the bolt through computer simulation, but it is only a preliminary analysis, and the obtained analysis results have a low degree of simulation and poor accuracy

Method used

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Embodiment Construction

[0022] Preferred embodiments of the present invention are described below, and it should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0023] The bolts (high-strength bolts) studied in this invention are used to connect various parts of the direct-drive wind turbine, and the ultimate strength, fatigue strength, bolt tightening state, and the stress of the connected parts are analyzed and calculated through computer simulation. Check whether it meets the requirements, if not, the design needs to be changed.

[0024] A kind of bolt strength analysis method of direct-drive wind-driven generator of the present invention, its specific analysis steps are as follows:

[0025] (1) Perform finite element modeling on the direct drive wind turbine structure, where:

[0026] A. The structural parts are divided into solid meshes, and the threaded holes are si...

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Abstract

The invention discloses a bolt strength analysis method for a directly-driven wind-driven generator. The bolt strength analysis method comprises the following steps of: (1) performing finite element modeling on a directly-driven wind-driven generator structure; (2) applying an external load to the directly-driven wind-driven generator structure; (3) computing and extracting a bolt stress result under the action of the external load; (4) performing post-processing on the extracted bolt stress result; and (5) computing the fatigue strength and ultimate strength of the bolt according to a post-processing result, wherein in the step (3), the bolt stress result comprises a result of axial stress on the same section of the bolt and two vertical bending stresses; and correspondingly, in the step (4), a post-processing process comprises the following steps of: performing superimposing computation on the axial stress and the two vertical bending stresses; and synthesizing resultant stress according to a maximum principal stress method. The analysis method disclosed by the invention can be used for analyzing bolt strength more accurately, and plays a more important role in guiding practical design of a bolt structure.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a bolt strength analysis method for a direct drive wind power generator. Background technique [0002] In recent years, with the rapid development of wind power generation technology, the stand-alone capacity of wind turbines has also become larger and larger. It has become an inevitable development trend of wind power technology to replace the combination structure of speed-up mechanism and ordinary generator with direct-drive generators. [0003] The existing direct-drive generator bolt strength analysis method extracts mostly the Mises stress of the bolt, and performs statistical analysis and calculation on the change of this stress with the change of the external load of the motor. This is a stress synthesized by the finite element software itself. The direction of the Mises stress under different loads is different, and it is not suitable to be directly used fo...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 陈争肖珊彩白艳李明辉张洪坤张林中张启应
Owner GUODIAN UNITED POWER TECH
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