Abstract
The motion equations of flapping elements of composite fin propulsion system were derived using Vittenburgs approach. These equations were linearized and used in the development of mathematical model which is capable of analysis of stability of motion and forced oscillations of such constructions in liquid flow. Critical flow velocity was calculated using numerical simulation: motion of considered configuration of composite fin propulsion system becomes instable for cases corresponding values of flow velocities above critical. Forced oscillations analysis of the construction reveals that maximum of amplitudes of related elements appears when operating frequency of main elements oscillations coincides with composite fin propulsion system natural frequency. This case seems to be the most interesting for further exploration with actual CFD methods for calculating hydrodynamic and propulsive characteristics of the propulsive system.
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