A Nonlinear Numerical Simulation Method of Bionic-Robot-Fish Quick Start

Abstract

Fishtail skeleton, muscles and nerves controlling body swinging were simulated using alloy sheet, giant magnetostrictive material (GMM) posted on this sheet and outside magnetic field in this study. Thus, the quick start of part natural fishes was simulated. The non-linear model related to large geometric deformation and non-linear damping was established after analysis and research. A recurrence formula is obtained using eigensolution, nonlinear dynamic equation and small parameter expansion method, and a numerical method for solving nonlinear problem is formed. The numerical analysis reveals the swimming mechanism of bionic robot fish, and the best start mode of this fish was designed. It also reveals the effect of material, geometric parameters, environmental factors, etc. on the starting of robot fish. The results show that there is an optimum frequency in the starting process of bionic robot fish. The optimum mode is a rapid transition from low order mode to high order mode, thus achieving the quick start of robot fish. These provide a theoretical basis and data support for designing the quick start of bionic robot fish.

DOI : http://dx.doi.org/10.11591/telkomnika.v12i3.4430