R. Panneer Selvam

Bio: R. Panneer Selvam is an academic researcher from Council of Scientific and Industrial Research. The author has contributed to research in topics: System identification & Added mass. The author has an hindex of 1, co-authored 1 publications receiving 12 citations.

System Identification of a Coupled Two DOF Moored Floating Body in Random Ocean Waves

Abstract: Dynamics of a large moored floating body in ocean waves involves frequency dependent added mass and radiation damping as well as the linear and nonlinear mooring line characteristics. Usually, the added mass and radiation damping matrices can be estimated either by potential theory-based calculations or by experiments. The nonlinear mooring line properties are usually quantified by experimental methods. In this paper, we attempt to use a nonlinear system identification approach, specifically the reverse multiple input-single output (R-MISO) method, to coupled surge-pitch response (two-degrees-of-freedom) of a large floating system in random ocean waves with linear and cubic nonlinear mooring line stiffnesses. The system mass matrix has both frequency independent and frequency dependent components whereas its damping matrix has only frequency dependent components. The excitation force and moment due to linear monochromatic waves which act on the system are assumed to be known that can either be calculated or obtained from experiments. For numerical illustration, a floating half-spheroid is adopted. The motion as well as the loading are simulated assuming Pierson-Moskowitz (PM) spectrum and these results have been analyzed by the R-MISO method yielding frequency dependent coupled added mass and radiation damping coefficients, as well as linear and nonlinear stiffness coefficients of mooring lines satisfactorily.

Frequency and time domain motion and mooring analyses for a FPSO operating in deep water

Abstract: ....... ........................................................................................................................................................... I CONTENTS....... ........................................................................................................................................................... II LIST OF FIGURES ........................................................................................................................................................ V LIST OF TABLES .......................................................................................................................................................... XI NOMENCLATURE ....................................................................................................................................................... XII ACKNOWLEDGEMENTS ........................................................................................................................................... XV DECLARATION... ...................................................................................................................................................... XVI CHAPTER

Robust Course Keeping Control of a Fully Submerged Hydrofoil Vessel without Velocity Measurement: An Iterative Learning Approach

Abstract: This paper proposes a novel robust output feedback control methodology for the course keeping control of a fully submerged hydrofoil vessel. Based on a sampled-data iterative learning strategy, an iterative learning observer is established for the estimation of system states and the generalized disturbances. With the state observer, a feedback linearized iterative sliding mode controller is designed for the stabilization of the lateral dynamics of the fully submerged hydrofoil vessel. The stability of the overall closed-loop system is analyzed based on Lyapunov stability theory. Comparative simulation results verify the effectiveness of the proposed control scheme and show the dominance of the disturbance rejection performance.