Browsing NTNU Open by Author "Etemaddar, Mahmoud"
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Dynamic analysis of floating wind turbines during pitch actuator fault, grid loss, and shutdown
Bachynski, Erin Elizabeth; Etemaddar, Mahmoud; Kvittem, Marit Irene; Luan, Chenyu; Moan, Torgeir (Journal article; Peer reviewed, 2013)Coupled non-linear aero-hydro-servo-elastic simulations of three types of floating wind turbines (spar, semi- submersible, and tension leg platform) are carried out for several fault cases over a range of environmental ... -
Load and response analysis of wind turbines under atmospheric icing and controller system faults with emphasis on spar type floating wind turbine
Etemaddar, Mahmoud (Doktoravhandlinger ved NTNU, 1503-8181; 2013:192, Doctoral thesis, 2013)Deep water offshore wind is a vast, reliable and economical energy source. Floating offshore wind turbines are potential systems to capture this energy which need to be analysed and designed in order to achieve economic ... -
Response analysis and comparison of a spar-type floating offshore wind turbine and an onshore wind turbine under blade pitch controller faults
Etemaddar, Mahmoud; Blanke, Mogens; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2016)This paper analyses the effects of three pitch controller faults on the responses of an onshore wind turbine and a spar-type offshore floating wind turbine. These faults include: a stuck blade pitch actuator, a fixed value ... -
Structural Load Analysis of a Wind Turbine under Pitch Actuator and Controller Faults
Etemaddar, Mahmoud; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2014)In this paper, we investigate the characteristics of a wind turbine under blade pitch angle and shaft speed sensor faults as well as pitch actuator faults. A land-based NREL 5MW variable speed pitch reg- ulated wind turbine ...