Abstract
This paper shows that the active hammer can reduce the deformation of the icebreaker by applying Active Control of Shock to the icebreaking process in the icebreaker. Although a usual icebreaker pushes the ice which has elastoplastic deformation characteristic to break ices by the breaker's hull, the icebreaker in this paper has the active hammer provided at the bow. The motion of active hammer is controlled by using two types of the triangular pulse, an acceleration pulse and a velocity pulse. For various peak positions and durations, the optimal command is searched to reduce deformation of the ice breaker by the numerical simulation. This paper shows not only the effective pulse shape of the active hammer, but also the difference of performance between steel and ice as the object to be plastically deformed.
