Modeling method and evaluation method for wind generating set gearbox bolt

By using beam units and finite element analysis in the modeling and evaluation methods of gearbox bolts of wind turbine sets, considering the impact of self-weight on bolt fatigue, the problems of low simulation accuracy and low efficiency in the prior art are solved, and more efficient and more accurate bolt fatigue evaluation is achieved.

CN119622938APending Publication Date: 2025-03-14CSIC HAIZHUANG WINDPOWER CO LTD
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Patent Information

Application Number
CN202411537169.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-31
Publication Date
2025-03-14

AI Technical Summary

Technical Problem

The prior art has problems of low accuracy and low efficiency in the simulation and verification of gearbox bolts for wind turbines, especially the impact of the self-weight of the gearbox first-level planetary carrier system on bolt fatigue, resulting in inaccurate fatigue algorithms.

Method used

A modeling method and evaluation method for gearbox bolts for wind turbine sets is proposed. By using beam units instead of screws in geometric modules, setting appropriate cross-sectional area and grid division, taking into account the elastic modulus and Poisson's ratio of the bolts, and adding fatigue damage assessment of self-weight to the finite element analysis.

Benefits of technology

The accuracy and simulation efficiency of the bolt simulation model are improved, and the impact of self-weight on bolt fatigue is taken into account. The fatigue damage obtained is more in line with the actual situation, and the simulation reliability is greatly improved.

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Abstract

The invention discloses a modeling method and an evaluation method for a gearbox bolt of a wind generating set. The modeling method comprises the following steps: importing a geometric model into a geometric module; the bolt is processed in the geometric module, an original screw rod is replaced by a beam unit, the sectional area of the beam unit of a thread and a bolt hole is the stress sectional area of the bolt, and the sectional area of the beam unit of a polished rod and a nut is the nominal diameter of the bolt; performing grid division on the model; the nut and the gasket, the gasket and the main shaft, and the primary gear ring and the main shaft are in standard contact, the nut end of the beam unit and the node of the inner surface of the nut are in direct contact, the surface connection is beam unit contact, the section area of the beam unit is nominal diameter, and the bolt hole end of the beam unit and the node of the inner surface of the bolt hole are in direct contact. The surface connection is beam unit contact, and the sectional area of the beam unit is the stress sectional area. According to the method, on the premise that the bolt stress precision obtained by the bolt simulation model is ensured, the model is simplified, and the simulation modeling efficiency is improved.
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