A dynamic model for tail-actuated robotic fish with drag coefficient adaptation

作者：Wang Jianxun; Tan Xiaobo^*

来源：Mechatronics, 2013, 23(6): 659-668.

DOI：10.1016/j.mechatronics.2013.07.005

• Robotic fish
• Dynamic model
• Carangiform locomotion
• Large-amplitude elongated-body theory
• Experimental model validation
• Drag coefficient adaptation

In this paper we present a dynamic model for a tail-actuated robotic fish by merging rigid-body dynamics with Lighthill%26apos;s large-amplitude elongated-body theory. The model is validated with extensive experiments conducted on a robotic fish prototype. We investigate the role of incorporating the body motion in evaluating the tail-generated hydrodynamic force, and show that ignoring the body motion (as often done in the literature) results in significant overestimate of the thrust force and robot speed. By exploiting the strong correlation between the angle of attack and the tail-beat bias, a computationally efficient approach is further proposed to adapt the drag coefficients of the robotic fish, and its effectiveness is supported by experimental results.

• 出版日期2013-9