Research on Test Platform of Hydrodynamic Force Produced by Undulation of the Long Flexible Fin

This paper studies the technical scheme to construct the test platform of hydrodynamic force produced by undulation of the long flexible fin, which will be an aided tool of studying dynamics of the long flexible fin undulatory propulsion belonging to fish MPF (median and/or pair fin) propulsion mode. Firstly, the architectural structure of test platform is determined according to the functional requirements, then, we design and realize the bionic device of the long flexible fin as a tested model and the measurement system of hydrodynamic force capable of measuring 6 DOF forces and motion parameters. The test platform utilizes the bionic device to imitate diversified undulatory movement modes of bionic object, uses the measurement system to obtain the hydrodynamic force and moment under the static and dynamic condition, and realizes remote operation through the measurement and control system. The test platform will be an important platform used to mechanism and control research of the long flexible fin undultory propulsion.