scholarly journals Reliability Analysis of Fatigue Failure of Cast Components for Wind Turbines

Energies ◽  
2015 ◽  
Vol 8 (4) ◽  
pp. 2908-2923 ◽  
Author(s):  
Hesam Rafsanjani ◽  
John Sørensen
Keyword(s):  
Reliability Analysis ◽  
Fatigue Failure ◽  
Wind Turbines

A Systematic Study on Fatigue Loads of Offshore Wind Turbines on Monopiles Foundation

2019 ◽  
Author(s):  
Lihua Peng ◽  
Chao Wang ◽  
Shengkai Niu
Keyword(s):  
Fatigue Failure ◽  
Wind Turbines ◽  
Systematic Study ◽  
Stiffness Matrix ◽  
Bending Moment ◽  
Offshore Wind ◽  
Wind Condition ◽  
Wave Direction ◽  
Offshore Wind Turbines ◽  
Fatigue Loads

Abstract Fatigue failure is one of the most common damage types of monopiles, which are widely used in offshore wind turbines (OWT). In this paper, a systematic study is performed to investigate the influence of stiffness matrix, sea states and wave directions on fatigue loads of monopiles. The stiffness matrix of the monopile determines natural frequency of the whole system and has great effect on fatigue loads. The influence of the pile diameter and length on the stiffness matrix are analyzed, which are calculated based on p-y curve of foundation. Then, three methods for selected sea states are compared. The dynamic response of the monopile using the different selection method under same wind condition are calculated and their contribution to the fatigue load is discussed. Finally, bending moment on the top of monopiles in vary wave direction are analyzed which shows significant on the fatigue. Several suggestions for design of monopile are given to avoid fatigue failure based on this study.

Reliability Analysis of Wind Turbines Considering Constraints and Legislation

2017 ◽  
Vol 5 (6) ◽  
pp. 480-486
Author(s):  
Nacef Tazi ◽  
◽  
Eric Châtelet ◽  
Youcef Bouzidi ◽  
◽  
...  
Keyword(s):  
Reliability Analysis ◽  
Wind Turbines

scholarly journals Reliability analysis of a gravity-based foundation for wind turbines: a code-based design assessment

Géotechnique ◽  
2014 ◽  
Vol 64 (8) ◽  
pp. 635-645 ◽  
Author(s):  
M.J. VAHDATIRAD ◽  
D.V. GRIFFITHS ◽  
L.V. ANDERSEN ◽  
J.D. SØRENSEN ◽  
G.A. FENTON
Keyword(s):  
Reliability Analysis ◽  
Wind Turbines ◽  
Design Assessment

Reliability analysis of detecting false alarms that employ neural networks: A real case study on wind turbines

2019 ◽  
Vol 191 ◽  
pp. 106574 ◽  
Author(s):  
Alberto Pliego Marugán ◽  
Ana María Peco Chacón ◽  
Fausto Pedro García Márquez
Keyword(s):  
Neural Networks ◽  
Reliability Analysis ◽  
Wind Turbines ◽  
Real Case ◽  
False Alarms

Reliability Analysis of Sub Assemblies for Wind Turbine at High Uncertain Wind

2012 ◽  
Vol 433-440 ◽  
pp. 1121-1125 ◽  
Author(s):  
T. Sunder Selwyn ◽  
R. Kesavan
Keyword(s):  
Wind Turbine ◽  
Reliability Analysis ◽  
Failure Rate ◽  
Wind Turbines ◽  
Mountain Pass ◽  
Brake System ◽  
Operating Period ◽  
Onshore Wind ◽  
Normal Operating ◽  
Wind Turbine System

The wind energy plays a vital role in the world renewable energy scenario. The modern wind turbine system has a complex and repairable components due to sophistication and centralized control. The failure characteristics of the onshore wind turbines depend on the terrain conditions. In the main mountain pass and hill area, there is a heavy uncertainty in the wind that is due to the frequent change in the direction of wind and the change in the velocity. It causes a rapid failure in the individual sub assemblies. There is a substantial need for improving the reliability in the stages of design, manufacturing, operation and maintenance. Normally the infant mortality failures are more in the onshore wind turbine and the failure rate is constant during normal operating period. It is a surprise that the failure rate has rapidly increased during normal operating period of the wind turbines placed exactly in the mountain pass and hilly area due to the high uncertainty in the wind. This paper deals with reliability analysis of major components of wind turbine system and its sub system such as rotor system, gear box, brake system, generator, hydraulic system and yaw system. This paper also investigates the reliability of wind turbines and its sub assemblies placed at Aramboly pass in India by using Weibull software as reliability tool for a grid connected 250 kW wind turbine. This analysis yields some surprising results about some sub assembly like yaw system, brake system and generator which are most unreliable.

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