SURGING MOTION AND BROACHING TENDENCIES IN A SEVERE IRREGULAR SEA
STEVENS INST OF TECH HOBOKEN NJ DAVIDSON LAB
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Nonlinearities are very significant for the surging motion of a ship in a following sea. Results are presently available only for the surging motion in regular following waves. The law of superposition cannot be used to treat the nonlinear surging motion in an irregular sea. Therefore, it is not possible to extend the results obtained in regular waves to predict the behavior in an irregular sea. A method to over come these difficulties to investigate nonlinear surging motion in an irregular sea is presented. Using this method, results are obtained for non linear surging motion in particular, solutions are given for the acceleration of a ship to an increased speed and for the subsequent run at that increased speed. A connection between broaching and nonlinear surging motion was presumed in previous discussions about broaching. This connection is confirmed and, furthermore, nonlinear surging motion is found to be the most important pre-condition for broaching.
- Marine Engineering