Frédéric Boyer

Biography

Frédéric Boyer was born in France in 1967. He received the Diploma in mechanical engineering from the Institut Nationale Polytechnique de Grenoble, Grenoble, France, in 1991, the Master of Research degree in mechanics from the University of Grenoble in 1991, and the Ph.D. degree in robotics from the University of Paris VI, Paris, France, in 1994. He is currently a Professor with the Department of Automatic Control, IMT-Atlantique, Nantes, France, where he is a member of the Robotics Team, Laboratoire des Sciences du Numérique de Nantes (LS2N). His current research interests include structural dynamics, geometric mechanics, and biorobotics (locomotion dynamics and underwater electric sensing). Dr. Boyer received the Monpetit Prize from the Academy of Science of Paris in 2007 for his work in dynamics and the French "La Recherche Prize” in 2014, for his works on artificial electric sense. He has coordinated several national projects and one European FP7-FET project on a reconfigurable eel-like robot able to navigate with electric sense. He is currently associate editor for IEEE TRO and Bioinspiration and Biomimetics.

Abstract

Cosserat-Lighthill based modelling for swimming fish and their robotic artifact


In animal locomotion, the use of flexible appendages can greatly improve the performance of locomotion (thrust and lift). Remarkably, fish can extract the energy contained in the vorticity of the surrounding flow using the flexibility of their body. As first discovered by Beal and al., even a dead fish can passively swim upstream in a Karman Vortex Street (KVS), a flow pattern typically produced downstream by a fixed bluff body immersed in a constant stream. In this talk we will present a set of modelling tools dedicated to the study of fish swimming. The body of the fish will be considered as a continuously actuated, or passive (soft), Cosserat beam in finite transformations, while the hydrodynamic forces will be captured by the Large Amplitude Elongated Body Theory (LAEBT) of James Lighthill. After a short reminder of the recent refinements of these two theories, we will see how they can be coupled to model the self-propelled and the passive swimming of a dead fish in a Von Karman street.