Proceedings of the International Conference on Emerging Trends in Engineering and Management (ICETEM14) 30-31,December, 2014, Ernakulam, India 41 COUPLED DYNAMIC ANALYSIS OF A SPAR- TYPE OFFSHORE FLOATING WIND TURBINE JOSE PRASOBH M J 1 , D. KARMAKAR 2 , P K SATHEESH BABU 3 1 Department of Naval Architecture and Ship Building, SNGCE, Cochin, India 2 Centre for Marine Technology and Engineering, Instituto Superior Tecnico, Universidade de Lisboa, Lisboa, Portugal, 3 P K Satheesh Babu, Department of Naval Architecture and Ship Building, SNGCE, Cochin, India ABSTRACT The fully coupled dynamic analysis of spar type offshore floating wind turbine is presented and a brief conceptual dimension of floater, mooring, tower, and turbine properties were used. The numerical model is generated in ANSYS-AQWA & WAMIT along with the combined wind and wave actions on the structure are analyzed. The numerical results are generated in time domain. The delta catenary mooring is employed on the spar-type floater. The aero-hydro-servo-elastic simulation is used in the analysis of the spar-type floating wind turbine. Various Operational and extreme environment conditions have been simulated. Further, the power production and the effects of aerodynamic and hydrodynamic loads on the spar type floating wind turbine are investigated. Keywords: Offshore floating wind turbine; Aero-servo-hydro-elastic simulation; Spar-type floater; Mooring; Hydrodynamic comptation. 1. INTRODUCTION The demand for renewable and reliable energy due to global warming, environmental pollution and energy crisis challenges the researcher’s needs to look for potential sources of green and sustainable energy. Wind is a proven, reliable and practically extractable source of energy for desired power generation (Burton (2011)). Wind engineering, and use of offshore wind turbine has become a separate research area and wind atlas of Europe started enlarging since from 1950. The world wind energy association estimate global wind power would increase 600GW by 2015. However the power from wind has a maximum extracting efficiency limit called Betz limit 0.59. In order to improve the wind energy production and to get large scale generation of electricity, wind turbine technology needs offshore wind energy resources. So far, most projects of offshore wind farms are located in relatively shallow water using bottom-fixed type wind turbines. To extend wind turbine systems to deeper water, practical research of offshore floating wind turbine systems is required. Also, developing offshore floating wind farms is important because it can minimize the scenery disturbance, avoid the noise problems generated by wind-driven blades, provide high wind speed by low surface roughness, and make use of extremely abundant deep water wind resources. (Bagbanci et al. (2011b)). Various configurations such as spar, tri- floater, semi-submersible and barge-type floater concept of offshore floating turbines have been studied. In the last few decades, a significant amount of work is carried out on the study of spar type floating wind turbine. Tong (1998) analyzed the technical and economic aspects of wind farms with brief conceptual design for FLOAT. Nielson et al. (2006) discussed the integrated dynamic analysis of spar type floating wind turbines. They developed simulation models for Hywind and compared their numerical results with model scale test results. Suzuki and Sato (2007) investigated the load on turbine blade induced by motion of floating platform and design requirement for the platform. Matsukuma and Utsunomiya (2008) performed motion analysis of a spar type floating wind turbine under steady wind INTERNATIONAL JOURNAL OF DESIGN AND MANUFACTURING TECHNOLOGY (IJDMT) ISSN 0976 – 6995 (Print) ISSN 0976 – 7002 (Online) Volume 5, Issue 3, September - December (2014), pp. 41-52 © IAEME: http://www.iaeme.com/IJDMT.asp Journal Impact Factor (2014): 4.9284 (Calculated by GISI) www.jifactor.com IJDMT © I A E M E