WHOLE-SHIP MOTIONS OF USCGC HEALY AS APPLIED TO GLOBAL ICE IMPACT FORCES

摘要

Providing the whole-ship motions in ice operations was part of the Canadian contribution to the Arctic Ship Technology Research and Development Program conducted on the USCGC Healy. An inertial measurement system was used to measure the whole-ship motions of the USCGC Healy during its Ice Trials, April/May 2000. The system provided time-series traces of ship motions in six degrees of freedom. A variety of loading conditions was sampled, ranging from relatively light ice conditions to backing and ramming in pressured first-year ice and multi-year ice. The ship motions experienced under the different ice conditions ranged from pitch angles of 0.2°to 0.8°and roll angles of 0.6°to 4.9°. A representative case in which the ship rammed a first-year ridge in open pack ice is discussed. During that event, the ship experienced a 0.7 °pitch and 4.9°roll. The whole-ship motions during the ridge impact were used to estimate a vertical bow force of 4.3 MN.