METHOD OF BREAKING ICE COVER Russian patent published in 2004 - IPC

FIELD: shipbuilding; submarine vessels running under ice and breaking ice cover by resonance method at surfacing through close pack-ice. SUBSTANCE: proposed method includes excitation of resonance flexural gravitational waves in ice during motion of ship under ice at resonance speed and performing repeated passages. Ship runs in proximity of lower surface of ice and her speed during repeated passages shall be equal to hump speed, i.e. shall correspond to wave resistance. After each passage, safety of surfacing is estimated by determination of degree of breaking ice judged from wave length measured from ship's deck to broken ice by means of instruments, such as radar for example. EFFECT: enhanced safety of surfacing. 1 dwg