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The disadvantages caused by the swing of a fish body were analyzed.The coordinate system of a two-joint robot fish was built.The hydrodynamic analysis of robot fish was developed.The dynamic simulation of a two-joint robot fish was carried out with the ADAMS software.The relationship between the swing of fish body and the mass distribution of robot fish,the rela-tionship between the swing of fish body and the swing frequency of tail,were gained.The impact of the swing of fish body on the kinematic parameters of tail fin was analyzed.Three methods to restrain the swing of fish body were presented and dis-cussed.
The causes caused by swing of a fish body was analyzed. The hydrodynamic analysis of robot fish was developed. The dynamic simulation of a two-joint robot fish was carried out with the the ADAMS software.The relationship between the swing of fish body and the mass distribution of robot fish, the rela-tionship between the swing of fish body and the swing frequency of tail, were gained. The impact of the swing of fish body on the kinematic parameters of tail fin was analyzed.Three methods to restrain the swing of fish body were presented and dis-cussed.