Improvement and testing of a robotic manta ray (RoMan-III)

Manta Ray generates thrust force by flapping two pectoral fins, which inspires the parametric study of the fin that affects the swimming performance. In this paper, the design of a robotic manta ray (RoMan-III) will be presented. A biomimetic flapping fin model will be discussed. The forward flapping motion, turning and gliding motions are considered in the study of Manta Ray's locomotion. Parameters related to thrust generation include the fin flapping amplitude, frequency, fin area, and fin shape. The fin model is derived based on a simplified model by Bernoulli equation. A scheme of motion control is also suggested for the fish locomotion. Experimental results have been obtained to demonstrate the validity of the proposed model.