Title page for ETD etd-32198-94431


Type of Document Master's Thesis
Author Treakle, Thomas W. III
Author's Email Address THOMAS.W.TREAKLE.II@saic.com
URN etd-32198-94431
Title A Time-Domain Numerical Study of Passive and Active Anti-Roll Tanks to Reduce Ship Motions
Degree Master of Science
Department Ocean Engineering
Advisory Committee
Advisor Name Title
Liapis, Stergios I.
Nayfeh, Ali H.
Neu, Wayne L.
Mook, Dean T. Committee Chair
Keywords
  • Anti-Roll Tank
  • Roll Motion
  • Stabilizing Devices
  • Ship
  • Control
Date of Defense 1998-04-03
Availability unrestricted
Abstract
Time-domain simulations were performed to investigate the influence of

passive and active anti-roll tanks and moving weights on ship motions. A

point mass moving across the ship was used to model the non-linear effects

of the tank systems in various computer simulation environments. PID

control of the mass position was used for the active tank (pump) systems

and a vibration absorber was used for the passive tank systems. A

single-degree-of-freedom non-linear code was developed to investigate the

influence of various coefficients and control strategies. The final active

and passive tank system implementations were included in the LAMP code

developed by SAIC. Results of the time-domain simulations are shown, which

indicate the effectiveness of these types of roll control systems.

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