Validation of ShipMo3D Version 1.0 User Applications for Simulation of Ship Motion
Defence R and D Canada - Atlantic Dartmouth, NS Canada
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ShipMo3D is an object-oriented library with associated user applications for predicting ship motions in calm water and in waves. This report describes the validation of ShipMo3D user applications with data from model tests and full-scale trials. Seakeeping predictions have been validated with model tests for a steered warship model and with sea trials for a naval destroyer. Predicted RMS motions in random seas are typically within 10 to 30 percent of measured values, with heave motions being the most accurate and roll motions being the least accurate. Predicted zero-crossing periods for motions in random seas are typically within 10 percent of measured values. For the tanker Esso Osaka performing turning circle maneuvers, predicted turning circle parameters tactical diameter, and speed and yaw rate at 1500 s, are within 18 percent of measured values from sea trials. Note that input data for the Esso Osaka included experimental hull maneuvering coefficients, and that less accurate results would be expected if maneuvering coefficients had to be estimated using other means.