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Failure Analysis and Fatigue Life Simulation of Large-Scale Wind Turbine Main Shaft Bearing

Author: DiBaoChao
Tutor: ChenJiGang；YangYuLin
School: Yanshan University
Course: Mechanical Design and Theory
Keywords: Wind Turbine Spherical Roller Bearings Load Numerical Simulation Fatigue Life
CLC: TH133.3
Type: Master's thesis
Year: 2011
Downloads: 307
Quote: 3
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Abstract


With the increasing depletion of traditional energy and pollution is increasing , wind energy as a green energy attracted universal attention . The majority of wind turbines currently has a high failure rate , reducing operational reliability , which the spindle bearing fatigue failure caused devastating losses. Spindle bearings are double row self-aligning roller bearings. Using computer simulation technique , carried out on the fan spindle bearing life prediction analysis to understand the failure mechanism for the bench to provide a theoretical basis for predicting the occurrence of failure has a very important significance. In this thesis, the following main aspects: First, the analysis of the wind turbine characteristics of the work spindle bearings , spindle bearings fault type and cause of the malfunction . Through analysis, by the alternating load fatigue is caused by contact with the fan shaft bearing failure of the important reasons , and fatigue life calculation methods and theories are analyzed and studied. The load of the wind turbine suffered classification and analysis of sources , starting from the aerodynamics of the rated speed of the fan blades of the wind turbine and the loads were studied on the fan of the spindle drive chain simplified abstraction , according to Tony Mainz theory and the blade element theory , deduced fans suffered main bearing axial load and radial load. Finite element analysis software, consider the interference fit of the bearing influence on the fan shaft bearings for modeling and static stress analysis to determine the spindle bearings of the maximum equivalent stress and contact stress position and size . Finite element analysis of the spindle bearing stress results obtained for the conditions , the use of nominal stress method and linear fatigue cumulative damage theory , carried out on the fan spindle bearing life prediction , simulation results obtained weaknesses spindle bearing fatigue strength and fatigue life.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Moving parts > Bearing
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