Vessel wave heading control apparatus

• US 4,769,773 A
• Filed: 08/28/1985
• Issued: 09/06/1988
• Est. Priority Date: 08/28/1985
• Status: Expired due to Fees

• Current Assignee: Shell Offshore, Inc. (Shell Plc)
• Original Assignee: Shell Offshore, Inc. (Shell Plc)
• Inventors: Shatto, Howard L. Jr.
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): Black, Thomas G.
• Application Number:
  US06/770,340
• Time in Patent Office: 1,105 Days
• Field of Search: 364/443, 364/434, 364/453, 364/466, 364/424, 364/432, 114/144 B, 73/180, 73/170 R, 73/189, 318/588
• US Class Current: 701/21
• CPC Class Codes: B63B 39/00 Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude for amphibious vehicles B60F3/0038
• CPC Class Codes: B63B 43/02 reducing risk of capsizing or sinking by means of watertight doors in bulkheads B63B43/24
• CPC Class Codes: G05D 1/0208 dynamic anchoring

Abstract

A vessel wave heading control apparatus is disclosed for use on a floating vessel. Linear acceleration signals from two accelerometers, which sense the rotational acceleration of the vessel due to waves which impact the vessel from a particular direction, are processed by a computer which subsequently produces vessel heading change signals to the steering and propulsion means of the vessel. These signals indicate the required heading and required rate of change of vessel heading necessary to turn the vessel into the direction of the oncoming waves in a timely manner.

Claims

1. Vessel wave heading control apparatus for controlling the heading of a vessel relative to a direction of wave impact of waves which impact said vessel from a particular direction, said vessel having a central longitudinal axis defined along the length of said vessel and a transverse plane defined substantially normal to said longitudinal axis, said vessel wave heading control apparatus comprising;

acceleration sensing means immovably attached to said vessel further comprising a first linear accelerometer and a second linear accelerometer, said accelerometers sensing and producing linear acceleration signals representing linear accelerations of the vessel along a first orthogonal axis and a second orthogonal axis, both axes mutually orthogonal to one another and located in said transverse plane,

vessel heading change signal generation means for generating vessel heading change signals, said vessel heading change signal generating means receiving said linear acceleration signals from said acceleration sensing means, defining the change in the vessel heading necessary to head said vessel into the direction of wave impact, defining the rate of change of the vessel heading, and thereafter producing said vessel heading change signals, said signals having values representing the direction and rate of vessel heading change necessary to head the vessel into the direction of wave impact, and

vessel heading change means for changing at a selected rate the heading of said vessel, capable of receiving said vessel heading change signals from said vessel heading change signal generation means and thereafter changing the heading of said vessel at a particular rate.