Ship roll control by pump activated tanks.
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Authors
Devin, James Curtis
Subjects
Roll tanks
Anti-roll tanks
Ship - roll control
Pump activated roll tanks
Anti-roll tanks
Ship - roll control
Pump activated roll tanks
Advisors
Thaler, G. J.
Date of Issue
1980
Date
September 1980
Publisher
Monterey, CA; Naval Postgraduate School
Language
en_US
Abstract
Frequency domain methods are siployed for the design and
analysis of anti-roll tank systems. A waveslope spectrum of
the ocean is developed based upon the trochoidal model of
ocean wa/es and the Pierson-Moskowitz ocean wave power
spectra. The response of a typical ship to the waveslope
spactrum 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 search 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.
Type
Thesis
Description
Series/Report No
Department
Department of Electrical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.