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R Panner Selvam
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R Panner Selvam
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R Panner Selvam
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Panneer Selvam, R.
Selvam, Panneer
Panneer Selvam, RajamanickamÂ
Panneer Selvam, Rajamanickam
Selvam, Rajamanickam Panneer
Selvam, R. Panneer
Rajamanickam, Panneer Selvam
Selvam, Panneer R.
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4 results
Now showing 1 - 4 of 4
- PublicationInstallation analysis of monopile for offshore wind data collection platform in high tidal environment(01-01-2019)
;Gujjula, Devender ;Alluri, Satya Kiran Raju ;Dhinesh, G.; Ramana Murthy, M. V.India has one of the fastest growing economies in the world and has an increasing energy demand, which is expected to double in 2020 compared to the present demand. Wind energy has gained wide acceptance across the globe and presently the focus is toward development of offshore wind farms. The offshore wind farm technology faces a number of technical challenges due to the harsh installation and operation conditions. Foundations supporting offshore wind turbines/wind data collection platforms are subject to constant wave loads. Offshore work involves increased risks of strong winds which affect the amount of time available for installation and maintenance which in turn influence capital and operation costs. Hence, this work is focused on development and analysis of economic and safe installation methodology in high tidal and current environment. A monopile has been designed suitable for high tidal environment at Gulf of Khambhat and Gulf of Kutch, Gujarat. Monopile static analysis, pile–soil interaction studies, and free vibration analyses have been carried out using finite element method. Developed safe and economic installation methodology through detailed lowering analysis for monopile in regular and irregular wave conditions and recommended appropriate vessel with hydraulic gripper as attachment to restrict the lateral displacements. - PublicationPitch motion studies of barge supporting 5-MW-NREL offshore floating wind turbine with gyrostabilizer(01-01-2019)
;Manmathakrishnan, P.The cyclic motion of a floating structure induces fatigue load on the floating wind turbine cause damage and trim the performance of the wind turbine. One has to minimize the pitch and roll angular motions to eradicate fatigue load and thereby mitigating the structural damage and increase the life time of the wind turbine. The ITI barge type floating wind turbine have highest fatigue load due to cyclic pitch motion in contrast with other basic types of floaters. For ITI barge the pitch motion is dominated over the roll for following and head sea, were roll is dominated for beam sea condition. A novel damping technique called gyroscopic motion counterpoise is used to reduce the pitch motion. Gyrostabilizer is used in various industries for motion stabilization, in ocean engineering it is used in ships and yachts for roll stabilization and in ocean energy converters for harvesting energy. For the first time the gyro-stabilizer is used in the floating wind turbine to damp the rotational motion. The numerical analysis is carried for ITI energy barge with gyrostabilizer supported 5-MW (National Renewable Energy Laboratory) NREL floating wind turbine. The results imply that the cyclic pitch rate is abated substantially by the gyrostabilizer. - PublicationModelling of Breaking Focused Wave Interaction with an Offshore Wind Turbine Support Structure in Intermediate Water(01-01-2021)
;Govindasamy, Vijaya Kumar ;Alagan Chella, Mayilvahanan; Offshore wind turbine (OWT) substructures are exposed to extreme waves under severe environmental conditions especially in intermediate and shallow waters. These extreme waves are highly nonlinear, which cause high intensity short duration impact forces on OWTs. The main objective of the study is to investigate numerically and experimentally wave impact forces on a vertical slender cylinder which resembles a monopile substructure for offshore wind turbines subjected to focused breaking waves in intermediate water depth. Both laboratory measurements and numerical simulations are performed in order to obtain more insights into the breaking wave impact problem. The total response forces on a monopile substructure were measured at higher resolution in a well-controlled programmable wave flume. In addition, acceleration of the monopile, the wave surface elevations around the breaking region were measured for different intensities of breaking wave impacts. Further, the evolution of focused breaking waves along the tank and their characteristics were examined. Numerical experiments are carried out in a computational fluid dynamics based three-dimensional numerical wave tank, REEF3D. The model is based on the incompressible Reynolds-averaged Navier–Stokes equations together with the k − ω for turbulence and the level set method for free surface. The experimentally measured main wave crest of the breaking focused wave group is fairly well captured in the numerical simulation. - PublicationEstimation of hydrodynamic derivatives from sea trial data using system identification technique(01-01-2019)
;RaviSekhar RadhaKrishna, K. O.S.R.The aim of the paper is to demonstrate the application of system identification technique to estimate the hydrodynamic derivatives with the full-scale manoeuvring data of a ship. The application of such technique would be for design of autopilots, enhancement of manoeuvring characteristics of ships in service and validation of mathematical model for ship manoeuvring. The paper briefly describes the mathematical model for ship manoeuvring used for parameter identification of a bulk carrier using extended Kalman filter system identification technique. The standard manoeuvres conducted in line with the recommendations of International Maritime Organization (IMO) resolution 137 include turning circle trials and crash stop trial details are presented and using extended Kalman filter technique hydrodynamic derivatives are estimated. This paper includes also the full scale trial data of a inshore patrol vessel.