AN INVESTIGATION OF THE SENSITIVITY AND THE LINEARITY OF RESPONSE OF A STEERED SHIP.
CALIFORNIA UNIV BERKELEY COLL OF ENGINEERING
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The change of ship response in a zig-zag maneuver due to a small variation of each of the coefficients in the equations of motion was obtained. The degree of the response change, and therefore the sensitivity, is expressed by a non-dimensional parameter. Abkowitzs mathematical model with Chislett and Strom-Tejsens data for the Mariner class ship are used for this purpose. The nonlinear equations are solved using a numerical technique. Both a dynamically stable and unstable ship were investigated by these techniques. The linear relationship between ship yawing and a harmonic rudder oscillation was found by a specially developed experimental technique. The test results were compared with the theoretical computations of the semi-empirical method. Excellent agreement between experiment and theoretical prediction was obtained. Author
- Marine Engineering