ABSTRACT
This chapter discusses the described mechanism in ice-induced vibrations between forced vibration and self-excited vibration and the similarity between ice-induced vibrations and vortex-induced vibrations. A dynamic single degree-of-freedom ice-structure interaction model is developed based on a novel approach combining self-excited vibration and forced vibration. Van der Pol equation, together with ice stress-strain rate curve and ice-velocity failure length are coupled to model the internal fluctuating nature of ice force in conjunction with the relative velocity and relative displacement caused by the structure as external effect. The Offshore structures subjected to the action of drifting ice floes may experience several kinds of interactions with the ice. From ice point of view, in forced vibration model, ice has its own failure characteristic and is not associated with either structural properties or structural motion variables. Ice is moving towards the structure at a constant velocity.
