scholarly journals Deterioration of cracks in onshore wind turbine foundations

2018 ◽  
Vol 167 ◽  
pp. 121-131 ◽  
Author(s):  
Jack McAlorum ◽  
Marcus Perry ◽  
Grzegorz Fusiek ◽  
Pawel Niewczas ◽  
Iain McKeeman ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Onshore Wind

Overview of Wind Turbine Field Failure Databases: A Discussion of the Requirements for an Analysis

2018 ◽  
Author(s):  
Roozbeh Bakhshi ◽  
Peter Sandborn
Keyword(s):  
Statistical Analysis ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Wind Farms ◽  
Onshore Wind ◽  
Failure Times ◽  
Reliability Parameters ◽  
Failure Data ◽  
Offshore Installations ◽  
Field Failure

With renewable energy and wind energy in particular becoming mainstream means of energy production, the reliability aspect of wind turbines and their sub-assemblies has become a topic of interest for owners and manufacturers of wind turbines. Operation and Maintenance (O&M) costs account for more than 25% of total costs of onshore wind projects and these costs are even higher for offshore installations. Effective management of O&M costs depends on accurate failure prediction for turbine sub-assemblies. There are numerous models that predict failure times and O&M costs of wind farms. All these models have inputs in the form of reliability parameters. These parameters are usually generated by researchers using field failure data. There are several databases that report the failure data of operating wind turbines and researches use these failure data to generate the reliability parameters through various methods of statistical analysis. However, in order to perform the statistical analysis or use the results of the analysis, one must understand the underlying assumptions of the database along with information about the wind turbine population in the database such as their power rating, age, etc. In this work, we analyze the relevant assumptions and discuss what information is required from a database in order to improve the statistical analysis on wind turbines’ failure data.

Steel hybrid onshore wind towers installed with minimal effort: Development of lifting process

2018 ◽  
Vol 42 (4) ◽  
pp. 335-352 ◽  
Author(s):  
Mohammad Reza Shah Mohammadi ◽  
Carl Richter ◽  
Daniel Pak ◽  
Carlos Rebelo ◽  
Markus Feldmann
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Lattice Structure ◽  
Cost Component ◽  
Onshore Wind ◽  
Supporting Structure ◽  
Element Simulation ◽  
Connection Component ◽  
Minimal Effort ◽  
Relevant Cost

The total costs per produced kilowatt-hour for wind turbines depend significantly on the investment costs. Thereby, the tower is a relevant cost component, which depends on the chosen supporting structure, the material, and especially on the erection process. Here, an innovative erection process is presented in order to minimize the wind turbine installation, which leads to excluding the extra tall cranes for installing the wind turbines with hub heights over 180 m. In order to propose the innovative erection process, a new hybrid lattice/tubular supporting structure for the onshore wind turbines is designed. The connection component between the tubular part and lattice structure is proposed considering the support functionality for the new erection process. Furthermore, the building steps of the complete erection process are explained. The operational and the lifting loads on wind turbine supporting structure are estimated, and consequently, the erection process stages were analyzed. Finally, the finite element simulation are performed to specify the critical stresses in subcomponents of the supporting structure in each lifting stage and to show the feasibility of the erection process. Moreover, the most critical points and the stages are investigated and stress level in the supporting structure components is computed.

Analysis of vibration monitoring data of an onshore wind turbine under different operational conditions

2020 ◽  
Vol 205 ◽  
pp. 110071 ◽  
Author(s):  
Yan Zhao ◽  
Jianing Pan ◽  
Zhuye Huang ◽  
Yachao Miao ◽  
Jianqun Jiang ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Vibration Monitoring ◽  
Monitoring Data ◽  
Onshore Wind ◽  
Operational Conditions

Offshore and Onshore Wind Energy Conversion: The Potential of a Novel Multiple-Generator Drivetrain

2013 ◽  
Vol 569-570 ◽  
pp. 644-651 ◽  
Author(s):  
Navid Goudarzi ◽  
Wei Dong Zhu
Keyword(s):  
Mathematical Model ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Simple Mathematical Model ◽  
Onshore Wind ◽  
Wind Energy Conversion ◽  
Qualitative And Quantitative ◽  
Advantages And Disadvantages ◽  
The Cost ◽  
Operational Range

A multiple generator drivetrain (MGD), where a single large generator in a wind turbine is replaced by multiple generators with the same or different rated powers, is proposed along with an automatic switch as an alternative to an existing MGD configuration. Qualitative and quantitative comparisons of a MGD with a conventional drivetrain are provided to better understand the advantages and disadvantages of having a MGD in wind turbines. New approaches for improving the efficiency and the reliability, expanding the operational range, and reducing the cost of a wind turbine are mentioned. A simple mathematical model for a MGD with electromagnetic clutches is developed, a novel prototype of a MGD is designed and fabricated, and experiments are conducted on the prototype. It is concluded that a multiple-generator drivetrain with generators operating individually or in parallel has a better potential of improving the efficiency and the reliability, expanding the operational range, and reducing the cost of offshore and onshore wind turbines than the existing MGD configuration.

scholarly journals Modeling and Analysis of Acoustic Emissions and Structural Vibration in a Wind Turbine

2012 ◽  
pp. 221-225
Author(s):  
CH. V. N. Badrinath ◽  
P. Kranthi Chakravarthy
Keyword(s):  
Wind Turbine ◽  
Acoustic Emissions ◽  
Structural Vibration ◽  
Test Bed ◽  
Onshore Wind ◽  
Modeling And Analysis ◽  
Virtual Test ◽  
Simulation Process ◽  
Measurement Analysis ◽  
Solution Design

The onshore wind turbine industry must overcome many technical, commercial, and environmental difficulties. A significant element for planning consent is operational noise. Acoustic limits are strictly enforced and can lead to near-neighbour complaints as well as contractual disputes. Reactec have diagnosed, analyzed and solved a problematic tonal resonance using ANSYS 12.1. This paper presents the measurement, analysis, modelling and solution simulation process when tackling a tonal noise issue in a megawatt scale wind turbine. Extensive modelling and simulation of the entire turbine system allows an in-depth diagnosis as well as a virtual test bed for solution design. The analysis reveals a complex interaction between gearbox resonances, mounting system performance, and tower design. A mitigation measure is developed and simulated in order to provide sufficient tonal reduction.

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