Dennis A Woolaver

US Patent:

43888895, Jun 21, 1983

Filed:

Mar 31, 1981

Appl. No.:

6/248389

Inventors:

A. Erich Baitis - Stafford VA
Dennis A. Woolaver - Rockville MD
Richard T. Nigon - Fairfax VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

B63H 2500

US Classification:

114144E

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 means 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 rate gain factor (K) that represents the reciprocal of the time-average roll rate, modified by the maximum allowable rudder rate and the natural roll period of the vessel.

US Patent:

44494696, May 22, 1984

Filed:

Mar 25, 1981

Appl. No.:

6/247486

Inventors:

Dennis A. Woolaver - Rockville MD
A. Erich Baitis - Stafford VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

B63H 2522

US Classification:

114150

Abstract:

A ship steering system includes a pump assembly for controlling hydraulicy actuated rudders, a first actuation unit for translating a helm steering command signal into a mechanical control signal for the pump assembly, and a second actuation unit for translating a combined helm steering command signal and ship roll reduction command signal into a mechanical control signal for the pump assembly. A decoupling device is interconnected to the first and second actuation units and the pump assembly for decoupling the first actuation unit from the pump assembly when the second actuation unit is activated.

US Patent:

43802060, Apr 19, 1983

Filed:

Mar 25, 1981

Appl. No.:

6/247484

Inventors:

A. Erich Baitis - Stafford VA
Dennis A. Woolaver - Rockville MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

B63B 3906

US Classification:

114122

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.

US Patent:

43984860, Aug 16, 1983

Filed:

Mar 25, 1981

Appl. No.:

6/247485

Inventors:

Dennis A. Woolaver - Rockville MD
A. Erich Baitis - Stafford VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

B63B 3906

US Classification:

114144R

Abstract:

A ship steering system includes a pump assembly for controlling hydraulicy actuated rudders, a first actuation unit for translating a helm steering command signal into a mechanical control signal for the pump assembly, and a second actuation unit for translating a combined helm steering command signal and ship roll reduction command signal into a mechanical control signal for the pump assembly. The second actuation unit includes an electrically activated mechanical actuator that translates the electrical helm and roll reduction command signal into a mechanical impulse that controls the operation of the pump assembly. The mechanical actuator includes a switch apparatus for switching the rudder control function from the first actuation unit to the second actuation unit when the switch apparatus and second actuation unit are activated. The mechanical actuator also includes an electrically activated fluid control valve that controls the flow of fluid to a rotary-vaned hydraulic actuator wherein the shaft thereof is linked to a coupling element of the switch apparatus. The coupling element is selectively engaged with a bearing member that operatively controls the pump assembly.

Address:

14808 Clavel St, Rockville, MD 20853

Phone:

301 460-5039

VIN:

5NPET46C37H192078

Make:

HYUNDAI

Model:

SONATA

Year:

2007