Feedback Linearization of Dynamical Systems with Modulated States for Harnessing Water Wave Power

As pointed out by other researchers, hybrid structures in ocean engineering are based on flat concrete foundations. Due to wave action these foundations are exposed to different pressure distributions on the top and bottom sides. As a result, the bottom side is exposed to a saddle type pressure distribution leading to huge forces on the foundation. Indeed, such huge forces have been observed at a number of offshore platforms installed in the North Sea.

In an attempt to turn a problem into an advantage, the concept in this work aims to develop an integrated system to harness and harvest ocean wave energy right at the seabed. The long-term interest is to develop integrated devices that can be used as actuators or sensors, which, due to low manufacturing cost, can be employed in large quantities for control of ocean engineering systems, e.g., maritime renewable power-plants, or monitoring of marine processes, e.g., oceanographic sensing.

A key element to the proposed system is the nonlinear coupled electromechanical oscillator unit, the dynamics of which are investigated with a novel approach in this work. The fundamental nature of the oscillator at hand makes it an excellent choice for applications involving oceanic transducers consisting of a dry driving electrical stator physically separated from a wet-driven payload mechanism. Without such units available at a low cost and a large number, harvesting the energy of a vibrating plate at seabed may prove impractical.

Auteur

Nikolaos I. Xiros was born in Athens, Greece. His career spans more than 20 years in both industry and academia, and his expertise lies within the fields of marine and electromechanical systems engineering. He holds an Electrical Engineer's degree, an M.Sc. in Math, an M.Sc. in Physics, and a Marine Engineering Doctorate. His research interests are process modeling and simulation, system dynamics, identification and control, reliability, and signal and data analysis. He has authored many technical papers and the monograph Robust Control of Diesel Ship Propulsion. He is also Chief Editor of the Springer Handbook of Ocean Engineering.

Contenu
List of Figures.- Acknowledgments.- State-Space Modulation and Demodulation.- Exact Feedback Linearization.- Exact Linearization of Modulated State Systems.- Electromechanical System Applications.- Conclusions and Future Work.- Bibliography.- Author's Biography.