Ashortbiography:
Dr Bhattacharya is currently a Senior Lecturer in Dynamics at University of Bristol. He is currently in Tongji University (China) under the Joint International Project funded by Royal Society (UK) and National Science Foundation (China) to carry out research on foundation behaviour during the past China earthquakes.
He teaches and conducts research in the broad area of Dynamic-Soil-Structure Interaction which a focus on (a) Dynamics of Offshore Wind Turbine Foundations; (b) Pile instability during seismic liquefaction. Prior to taking up his current post, he was a Departmental Lecturer in Engineering Science at Oxford University, Junior Research Fellow of Somerville College (Oxford), Lecturer in Lady Margaret Hall (Oxford) and Brasneose College (Oxford).
Before joining the University of Oxford, Dr Bhattacharya worked at Fugro Limited (UK) and was involved in various offshore projects such as the Deep Water Gunashli (Azeri Chirag and Gunashli Project), Judy Platform, Munro platform, anchor piles for FPSO. In 2004, he was appointed 21st Century Centre of Excellence fellow at the Centre for Urban Earthquake Engineering (CUEE) at the Tokyo Institute of Technology. Dr Bhattacharya obtained his doctorate from the University of Cambridge (U.K) in the year 2003.
Summary of the lecture:
Experimental and numerical modelling of the dynamics of Offshore Wind Turbines supported on different types of foundations
Dr Subhamoy Bhattacharya
University of Bristol (U.K)
Offshore wind-turbines are currently considered as a reliable source of renewable energy. These structures, due to their slender nature, are dynamically sensitive at low frequencies: the first modal frequency of the system (less than 1Hz) being very close to that of the excitation frequencies. The majority of operational offshore wind-turbines situated in UK waters (round 1 and 2) are founded on monopiles in water depths up to 30 meters. For future development rounds where water depths are up to 70m, alternative foundation arrangements are needed.
To date there has been no long-term observations of the performance of these relatively novel structures. Monitoring of a limited number of offshore wind-turbines has indicated a departure of the system dynamics from the design requirements. This lecture summarises the results from a series of 1:100 scale tests of a V120 Vestas turbine supported on two three types of foundations: monopiles, tetra-pod suction caissons and floating type of turbines. The test bed used consisted of kaolin clay and sand. Up to 1.25million loading cycles were applied to the scaled model and the dynamic properties of the system were monitored. The results provide an insight into the long term performance. Some interesting dynamic soil-structure interaction issues are identified and discussed.
报告时间：2011年12月16日（周五）下午3：00——4：30
地点：安中大楼B座328
岩土工程研究所