Frequency domain methods are employed for the design and analysis of antiroll tank systems. A waveslope spectrum of the ocean is developed based upon the trochoidal model of ocean waves and the Pierson-Moskowitz ocean wave power spectra. The response of a typical ship to the waveslope spectrum is studied with the aid of a numerical example. FORTRAN subroutines for the design of passive and pump-activated U-tube anti-roll tanks are developed, and the effects of a tank installation on the ship parameters is observed. Many controller design methods are investigated, and final design is accomplished by exhaustive research of closed-loop frequency responses. Frequency responses of passive and activated tank stabilized ships are compared with that of an unmodified ship to illustrate the effectiveness of design. The effects of vessel displacement variations due to consumption of fuel and stores on tank effectiveness and controller design are discussed. (Author)


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