Fatigue reliability analysis of wind turbines shafts caused by sub-synchronous oscillations during power system fault

2016 ◽  
Author(s):  
Kuanyin Tian ◽  
Peng Wang ◽  
Wenping Qin ◽  
Xiaoqing Han ◽  
Yanbing Jia ◽  
...  
Keyword(s):  
Power System ◽  
Reliability Analysis ◽  
Wind Turbines ◽  
Fatigue Reliability ◽  
Synchronous Oscillations

scholarly journals Gear Contact Fatigue Reliability Analysis for Wind Turbines Under Stochastic Dynamic Conditions Considering Inspection and Repair

2014 ◽  
Author(s):  
WenBin Dong ◽  
Torgeir Moan ◽  
Zhen Gao
Keyword(s):  
Time Series ◽  
Wind Turbine ◽  
Reliability Analysis ◽  
Wind Turbines ◽  
Contact Fatigue ◽  
Crack Size ◽  
Contact Forces ◽  
Stochastic Dynamic ◽  
Fatigue Reliability ◽  
Gear Contact

Reliability is one of the most important features of the wind turbine gearbox, especially in offshore wind turbines (OWTs). This paper describes a general way to perform gear contact fatigue reliability analysis for wind turbines considering inspection and repair. A simplified predictive surface pitting model for estimating gear fatigue lives is applied to establish the ‘so-called’ limit stated functions. The National Renewable Energy Laboratory (NREL)’s 750kW land-based wind turbine is used to perform time domain simulations considering different wind speeds that the turbine will experience, whose occurrence frequencies are described by a generalized gamma distribution. The time series of the torques in the main shaft are obtained from the global dynamic response analysis of the wind turbine. The time series of the gear contact forces are obtained from the dynamic analysis of the gearbox through multi-body simulation. The 2-parameter Weibull distribution is used to fit the long-term probability distribution of the gear tooth contact pressures. The reliability analysis is based on fracture mechanics (FM) analysis of crack growth. Finally the sensitivity of the reliability index and failure probability on initial crack size, critical crack size, detectable crack size, crack size after repair, material property and environmental loads is estimated considering the effect of inspection.

ANN-Based Structure Optimization with Fatigue Reliability Constrains

2012 ◽  
Vol 204-208 ◽  
pp. 3128-3131
Author(s):  
Li Rong Sha ◽  
Yue Yang
Keyword(s):  
Structural Optimization ◽  
Objective Function ◽  
Reliability Analysis ◽  
Response Surface ◽  
Minimum Weight ◽  
Structure Optimization ◽  
Fatigue Reliability ◽  
Ann Model ◽  
Surface Method ◽  
The Relationship

The ANN-based optimization for considering fatigue reliability requirements in structural optimization was proposed. The ANN-based response surface method was employed for performing fatigue reliability analysis. The fatigue reliability requirements were considered as constraints while the weight as the objective function, the ANN model was adopted to establish the relationship between the fatigue reliability and geometry dimension of the structure, the optimal results of the structure with a minimum weight was reached.

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