Ships – Ballasting – Antirolling
Patent
1981-03-25
1983-04-19
Blix, Trygve M.
Ships
Ballasting
Antirolling
114144R, B63B 3906
Patent
active
043802060
ABSTRACT:
A ship stabilization system, which utilizes the rudders to compensate for nd and wave induced roll motions, includes a hydraulically actuated mechanism for controlling the position of the rudders; a pump coupled to the hydraulic mechanism for controlling the flow of hydraulic fluid; and a flow control device connected to the pump for controlling the flow rate of fluid through the pump. The ship stabilization system also includes a first actuation device for translating helm steering command signals into control impulses for the flow control device and a second actuation device for translating helm steering command signals and roll reduction control signals into control impulses for the flow control device. A coupler is connected to the first and second actuation devices and the flow control device for disengaging the first actuation device from the flow control device when the second actuation device is activated. The roll reduction signal processed by the second actuation device consists of the instantaneous roll rate of the ship and the statistical gain factor representing the statistical average roll rate during a predetermined period of time.
REFERENCES:
patent: 2892435 (1959-06-01), Ljungstrom
patent: 3137265 (1964-06-01), Meyerhoff
patent: 3842777 (1974-10-01), Larsh
Baitis A. Erich
Woolaver Dennis A.
Beers R. F.
Blix Trygve M.
Marsh L. A.
Sotelo Jesus D.
The United States of America as represented by the Secretary of
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