JUDUL: The Offshore Renewable Energy Series: Experimental and Numerical
Approach of Fluid-Induced Vibrations on Tidal Turbines

PENULIS: Dr. Ir. Nu Rhahida Arini, S.T., M.T.

SINOPSIS: 

Offshore or ocean renewable energy, especially tidal current energy, is very promising to replace fossil energy to generate electricity. The fact of depleting fossil fuel and high electricity demand currently makes the use of tidal current renewable energy is demanding. However, the behavior of tidal current energy extraction is not fully understood. Thus, the book provides an insight to introduce an aspect of how the ocean renewable energy generator works.

The tidal current energy converter is a mechanism which converts kinetic energy from ocean current into electricity. The converter includes a turbine which is coupled to an electricity generator. Once the tidal current hits the turbine blade, the lift force is created and thus the turbine rotor rotates. This rotation further rotates the generator which is coupled to the turbine rotor. The rotation is a form of turbine rotor’s response during operations. Another response generated in the tidal turbine operation is vibrations of which is the side effect. Vibration is oscillating motions of an object due to external force working on. The vibrating motion can be a disadvantage due to uncontrolled motion and harms the turbine performance. Therefore, it should be minimized. Another side effect can occur when vibration coincides with object’s natural frequency. The natural frequency is an object frequency at which a system can oscillate with the absence of external or driving force. It is a property of an object with respect to its nature (material, geometry etc.). This parameter should be considered carefully to avoid any damage in the presence of vibration. Therefore, evaluation must be conducted to analyze the fluid induced vibration in offshore renewable energy so that it can operate safely and efficiently. This book aims to study the fluid induced vibration in vertical tidal axis turbines using numerical and experimental approaches. Both results are observed, and the results reveal the importance of both methods to predict the vertical axis tidal turbines performance and failure.

This book is one book of the offshore renewable energy series which proposes valuable knowledge of how offshore energy converter works.