Modeling and control of a link-based dolphin-like robot capable of 3D movements

This paper focuses on a three-dimensional (3D) dynamic model for a self-propelled, multilink dolphin-like robot to predict the dynamic behaviors of the bio-inspired artificial dolphin system within the framework of multibody dynamics. The propulsive structure involves a multilink tail and an oscillating fluke cooperatively achieving dorsoventral oscillations, as well as a pair of mechanical flippers performing flapping movements, which can actually be simplified as an open-chain, tree-like multibody with a mobile base. The Schiehlen method is further utilized to formulate the equations of the motion on the basis of a well-integrated kinematic and dynamic analysis of propulsive elements. A rough comparison between simulations and experiments on forward swimming and combined motions verifies the effectiveness of the formed model and corresponding locomotion control method. ? 2008 Springer Berlin Heidelberg.EI