Planetary gear box bolt analysis method

Abstract

The invention discloses a planetary gear box bolt analysis method. The method comprises the steps of: establishing a gear box system model which comprises a shell model, a planet carrier model, a gearbox shafting model and a gear box external load; specifying a plurality of meshing states according to a gear operation process in a gear box shafting model; obtaining reaction forces of the plurality of designated nodes in the plurality of meshing states, wherein the reaction forces of the plurality of designated nodes obtained in each meshing state respectively form a group of reaction forces;establishing a gear box connection model; in a finite element analysis process, according to the connection module obtained according to the above, setting a connection mode in the finite element analysis model, and loading the multiple groups of reaction forces obtained in the previous step into the finite element analysis model as boundary conditions, performing calculating to obtain the stressof the connecting bolt and the connecting pin in the gear box system model in each meshing state, and calculating the safety coefficient and/or fatigue damage of the connecting bolt and the connectingpin. According to the invention, the reliability of the connecting bolt and the connecting pin in the gearbox can be effectively evaluated.

Description

technical field [0001] The invention relates to the technical field of computer-aided design, in particular to a method for analyzing bolts of a planetary gearbox. Background technique [0002] The wind power speed-up gearbox is one of the important components of the wind turbine, and the connection of high-strength bolts on the joint surface of the gearbox plays an important role. Due to the influence of wind power alternating loads, the force on the bolts is complex, and it is difficult to accurately calculate the force on the bolts by traditional engineering mechanics. Once the high-strength bolts are damaged, it will seriously affect the meshing of the internal gear pairs, and even cause the overall damage of the gearbox. [0003] In the prior art, the analysis of the high-strength bolts of the wind power gearbox is mainly carried out according to the VDI2230 standard. In addition, regarding the calculation of the connecting bolts of wind power hubs, some people conduct...

AI Technical Summary

Problems solved by technology

[0005] The existing engineering mechanics calculation methods cannot evaluate the stress state of each bolt at the joint surface of the wind turbine gearbox and determine the dangerous section;

[0006] The existing calculation methods for bolts are all static calculation and analysis, which cannot evaluate the stress state of bolts under the dynamic operation of the wind power speed-up gearbox;

[0007] The existing calculation method is only for the calculation of the simple bolted connection of the flange, and the joint surface of the wind power gearbox has not only bolts but also pins. The existing method cannot accurately evaluate the load distribution ratio of bolts and pins

[0008] Therefore, the static calculation method in the prior art cannot completely solve the reliability analysis problem of the connecting bolts on the wind power gearbox

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