DYNAMIC ANALYSIS OF UNDULATORY PROPULSION OF LONG FLEXIBLE FIN
柔性长鳍波动推进动力学分析

With the test model of bionic underwater vehicle based on undulatory propulsion of long flexible fin as the background, the paper studies the undulatory propulsion dynamics of the long flexible fin of Gymnarchus Niloticus. Assuming that the fin bone vibrates according to a sine law, this paper establishes the mathematical model of undulatory curved surface of the long flexible fin. Then using the resistive theory and a modified hypothesis about fluid, the propulsion force generated by undulation of the long flexible fin is analyzed, and the dynamic model is obtained. Finally, with the aid of numerical simulation, the paper obtains the formula for hydrodynamic force and moment of the bionic long flexible fin of the test model caused by the fin undulatory movement. This formula provides a theoretical basis for dynamic analysis and control system design of bionic underwater vehicle.