Method and device for evaluating strength of elastic support connecting bolt of wind generating set

Abstract

The invention relates to a method and device for evaluating the strength of an elastic support connecting bolt of a wind generating set, and the method comprises the steps: dividing grids on the basis of building a geometric model, and setting a contact relation and boundary conditions between adjacent parts to obtain a finite element model; applying the maximum bolt pre-tightening force and each limit working condition load and applying the minimum bolt pre-tightening force and each fatigue working condition load to the finite element model of the elastic support connecting bolt, so as to evaluate and analyze the limit strength and fatigue strength of the elastic support connecting bolt. According to the method, a complete load transmission path of the elastic support is considered in the aspects of finite element modeling and strength checking, a relatively comprehensive finite element model is established, and a static hub center load is applied to check the limit and fatigue strength of a connecting bolt of the elastic support, so the stress is more real, and accurate checking of the elastic support connecting bolt of the fan gear box can be realized.

Description

technical field [0001] The invention relates to the technical field of performance detection of wind power generation equipment, in particular to a method and device for evaluating the strength of elastically supported connecting bolts of a gearbox of a wind power generation unit. Background technique [0002] With the continuous increase of the power of wind turbines, the requirements for the vibration, safety and stability of the wind turbines are also getting higher and higher. The installation of elastic supports can effectively reduce the impact of vibration on the whole machine and improve the safety performance and service life of the fan. The elastic support connecting bolts of the gearbox are used to connect the gearbox, elastic support and main frame and other components, and are subjected to complex dynamic loads during the operation of the fan. It is very important to analyze the strength of the elastic support connecting bolts to avoid the impact of bolt failure...

AI Technical Summary

Problems solved by technology

[0003] At present, the analysis of the strength of elastic support connecting bolts is less, and most of them use the finite element method to analyze the elastic support itself, ignoring the influence caused by the load transfer path of elastic support and other related components.

The strength analysis of connecting bolts with elastic support can refer to the modeling and loading method of elastic support strength analysis, while the existing calculation method of elastic support of gearbox only considers the elastic support itself of the gearbox in modeling, ignoring the gearbox and main frame, etc. The impact caused by the relevant components, and the load borne by the elastic support is simplified during loading, which cannot reflect the real force situation, so that the calculation result of the elastic support of the gearbox is not accurate enough

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