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)
Ship Roll Control by Pump Activated Tanks
1980
83 pages
Report
No indication
English
Marine Engineering , Ship motion , Ballast tanks , Roll , Stabilization systems , Control systems , Tubes , Pumps , Activation , Closed loop systems , Power spectra , Ocean waves , Ocean models , Computerized simulation , FORTRAN , Subroutines , Equations of motion , Frequency response , Displacement , Naval architecture , Buoyancy , Coupling(Interaction) , Computer programs , Theses , Antiroll tanks , Roll control , Active systems , U tubes , Pump activated tanks
Control of ship roll using passive and active anti-roll tanks
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The Analysis of the Control of Activated Anti-Roll Tanks
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|Theoretical and experimental study of ship-roll stabilization tanks
Engineering Index Backfile | 1968
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