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

FIELD: shipbuilding; submarine ships 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 submarine ship under ice at resonance speed and performing repeated passages. Ship runs in immediate proximity of lower surface of ice and her speed during repeated passages shall be equal to hum speed. Degree of breaking ice cover is estimated by curvature of profile of gravitational waves in broken ice. EFFECT: enhanced efficiency of ice breaking.