This report is a summary of SRI research project entitled “Study on Advanced Design Technology for the New Patrol Icebreaker”. In order to provide basic data for the advanced design technology for the new patrol icebreaker, the study was carried out from 1996 to 1998. The study consists of construction of data base for sea ice condition in the Sea of Okhotsk, measurement of propeller shaft forces of the icebreaker, and measurement of response of hull to the ice load. Sea trials of the patrol icebreaker were conducted for the above study in the Sea of Okhotsk。 Sea ice observation using ship-born systems such as video camera and Laser altimeter and direct measurement by drill-hole in ice supplied valuable information on ice and snow thickness, strength of ice, and surface profile of deformed ice. The information was added to the data base. Shaft thrust and torque were measured using strain gauges attached to the propeller shaft. Accuracy of the thrust measurement was discussed. Hull strain resulting from ice loads was measured using strain gauges located around the bow. Using the strain values and FEM calculation of simple structure model, the ice load on the hull was estimated.
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