Sensitivity Study of Control Parameters during Underway Replenishment Simulations Including Approximate Nonlinear Sea Effects.
Research and development rept.,
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD
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This report describes the fourth phase of the development of a hybrid computer simulation of two ships during underway replenishment UNREP operations. Emphasis was placed on performing sensitivity analysis of the maneuvering control parameters. Some approximate nonlinear sea state excitations acting on the ships hulls due to a specific irregular sea were added to the simulation model. The mathematical model for both the nonlinear force and moment excitations was developed by using the Volterra Series mathematical formalism. The forces and moments were represented during the simulation by time series. The sea state was defined in the UNREP simulation by the Pierson-Moskowitz Spectra. The simulation incorporating some approximate nonlinear sea state excitations, together with an automatic controller on each ship, was used for control variable sensitivity studies.
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