Strength analysis method and magnitude of interference analysis method of main bearing and shaft sleeve in wind turbine generator

Abstract

The invention discloses a strength analysis method and magnitude of interference analysis method of main bearing and shaft sleeve in wind turbine generator. The strength analysis method comprises the steps of 1, setting up an analytical model based on finite element modeling; 2, establishing interference fit and contact relations and simulating boundary conditions of bearing bush to arrange contact boundaries of the analytical model; 3, inflicting load and constrained boundaries and making finite element analysis to draw stress of bearing bush under load effect and contact state with main bearing and analyze strength of bearing bush of main bearing by the drawn stress and contact state; the analytical method of magnitude of interference analyzes strength of bearing bush and judges interference fit relations between bearing bush and main bearing based on analytical result of strength of bearing bush. If interference fit relations are not fulfilled in judgment, magnitude of interference shall be adjusted till interference fit relations are fulfilled and best magnitude of interference is output. The analytical methods of strength and magnitude of interference of bearing bush of main bearing in the wind turbine generator set has easy methods of realization and advantages of truthful reflection of stress of bearing bush, high analytical precision, reasonable design of magnitude of interference and so on.

Description

technical field [0001] The invention relates to the technical field of design of large-scale wind power generating sets, in particular to a strength analysis method and an interference analysis method for a main bearing sleeve in a wind power generating set. Background technique [0002] The main shaft bearing in a large wind turbine (2MW and above) is a key component supporting the transmission chain of the entire wind turbine, the reliability of its axial positioning is particularly important, and the axial positioning of the main bearing is all using a shaft sleeve. During the operation of early wind turbines, the shaft sleeve often slipped, and the shaft sleeve and the main shaft would wear each other after the shaft sleeve slipped. In the design process of the shaft sleeve of large-scale wind turbines, the shaft sleeve and the main shaft are designed to be an interference fit, which effectively avoids the slip of the shaft sleeve, but after the interference fit is forme...

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Problems solved by technology

During the operation of early wind turbines, the shaft sleeve often slipped, and the shaft sleeve and the main shaft would wear each other after the shaft sleeve slipped. In the design process of the shaft sleeve of large-scale wind turbines, the shaft sleeve and the main shaft are designed as an interference fit, which effectively avoids the slip of the shaft sleeve, but after the interference fit is formed, the force of the shaft sleeve becomes complicated. , especially when the main shaft is deformed, the stress of the shaft sleeve is mainly in three aspects: one is that the shaft sleeve will follow the bending deformation of the main shaft in the axial direction to generate bending stress; the other is that the end face will squeeze the end face of the main shaft bearing The third is the contact stress generated by the interference fit between the sleeve and the shaft

[0003] At present, the analysis of the strength of the main bearing bushing in large wind turbines usually uses engineering algorithms, but as the power level of wind turbines increases, the load becomes larger and larger, and it is impossible for the main shaft to undergo elastic deformation under the load. Avoided, after the interference fit is formed as described above, the force on the shaft sleeve after the deformation of the main shaft will no longer be a single uniform load, but the result of the joint action of force, moment and contact. The engineering algorithm cannot consider the main shaft As well as the influence of bearing stiffness on the strength of the bushing, the calculation of the contact stress is too simplified, and it is impossible to simulate complex boundary conditions, so it cannot reflect the real stress of the bushing, which affects the accuracy of analysis and calculation

In addition, when using the engineering algorithm, since the contact state between the shaft sleeve and the main shaft under the external load cannot be predicted, the selection of the interference is completely based on experience, which further increases the design risk

In summary, the traditional engineering algorithm can no longer meet the strength analysis requirements and interference design requirements of the main bearing sleeve in large wind turbines

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