Coordinated steering of a surface ship.
Lee, Sang Sik
Thaler, George J.
Gerba, Alex Jr.
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The conventional approach to ship steering is to regard the ship as a single input, single output system without cross-coupling or interaction between speed, yaw and roll. This approach has found successful application, particularly in conventional vessels where the amount of cross-coupling is normally slight. But, as a result of tight maneuvering, the modem warship suffers severe cross-coupling effects because of large control surfaces, high speed and low tonnage. Consequently, the adoption of a multivariable approach to ship steering would appear to be more suited for the design of a steering control system. This thesis describes the results of a simulation study of pre-compensator design to suppress the undesirable cross-coupling effects between speed, yaw and roll. Simulation studies using DSL and Function Minimization are the basis for accomplishing the design. Simulation results presented indicate that the adoption of a multi-input, multi-output approach would result in a significant improvement in the combined steering and stabilization problem of a warship.
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