US 7,367,464 B1Granted

Pendulation control system with active rider block tagline system for shipboard cranes

AssigneeThe United States of America as represented by the Secretary of the Navy

InventorsMichael J. Agostini, J. Dexter Bird, III, Jeffrey P. Green, Frank A. Leban, Gordon G. Parker

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Abstract

The inventive control system, as typically embodied, includes sensing mechanisms, a computational processing unit, and an algorithm for processing inputs and generating outputs to control a rotating pedestal crane equipped with a Rider Block Tagline System (RBTS). Typical inventive embodiments uniquely feature a processing algorithm that distributes various control modes that operate not only through the crane's hoisting, luffing, and slewing mechanisms but also through the crane's RBTS; the inventive algorithm thereby effectuates motion compensation and pendulation damping with respect to the crane. This algorithmic allocation of control represents a more efficient crane anti-pendulation methodology than conventional methodologies; in particular, the inventive methodology exerts significantly greater control of the payload while exacting significantly less burden upon the hoisting, luffing, and slewing mechanisms of the crane.

Claims10

Dependent claims

A system for use in association with a rotary boom crane situated onboard a ship and capable of hoisting a payload, said crane including a boom, a payload hoist line, a rider block, a rider block lift line, a left rider block tagline, and a right rider block tagline, said apparatus comprising:

a ship motion sensor for measuring the motion of said ship;
a payload swing sensor for measuring the pendulation of said payload;
plural crane geometry sensors including:
a slew angle sensor for measuring the slew angle and slew-angular rotation rate of said boom;
a luff angle sensor for measuring the luff angle and luff-angular rotation rate of said boom;
a payload hoist line sensor for measuring the length and rate-of-change-of-length of said payload hoist line;
a rider block lift line sensor for measuring the length and rate-of-change-of-length of said rider block lift line;
a left rider block tagline sensor for measuring the length and rate-of-change-of-length of said left rider block tagline;
a right rider block tagline sensor for measuring the length and rate-of-change-of-length of said right rider block tagline;
a computer program product for residence in the memory of a computer, said computer program product comprising a computer-useable medium having computer program logic recorded thereon, said computer program logic including:
means for processing input signals, said input signals including input signals received from said ship motion sensor, said payload swing sensor, and said crane geometry sensors, said means for processing including means for calculating solutions pertaining to cancellation of the motion of said ship and means for calculating solutions pertaining to damping of the pendulation of said payload;
means for transmitting output signals, said output signals being based on said processing of said input signals, said output signals being for controlling the slew angle of said boom, the luff angle of said boom, the length of said payload hoist line, the length of said rider block lift line, the length of said left tagline, and the length of said right tagline.

9 more elements

Shipboard rotary boom crane apparatus for hoisting a payload, said apparatus comprising:

a boom, said boom being capable of slewing and luffing at a first end and having a boom tip at a second end;
a rider block, said rider block being situated generally below said boom tip;
a payload hoist line, said payload hoist line being adjustable in length and being reeved through said rider block;
a rider block lift line, said rider block lift line being adjustable in length and being attached to said rider block;
a left rider block tagline, said left rider block tagline being adjustable in length and being attached to said rider block;
a right rider block tagline, said right rider block tagline being adjustable in length and being attached to said rider block;
a ship motion sensor, said ship motion sensor being for measuring the motion of said ship;
a payload swing sensor, said payload swing sensor being for measuring the pendulation of said payload;
plural crane geometry sensors, said crane geometry sensors including a slew angle sensor, a luff angle sensor, a payload hoist line sensor, a rider block lift line sensor, a left rider block tagline sensor, and a right rider block tagline sensor, said slew angle sensor being for measuring the slew angle and slew-angular rate of said boom, said luff angle sensor being for measuring the luff angle and luff-angular rate of said boom, said payload hoist line sensor being for measuring the length and rate-of-change-of-length of said payload hoist line, said rider block lift line sensor being for measuring the length and rate-of-change-of-length of said rider block lift line, said left rider block tagline sensor being for measuring the length and rate-of-change-of-length of said left rider block tagline, said right rider block tagline sensor for measuring the length and rate-of-change-of-length of said right rider block tagline;
a computer program product for residence in the memory of a computer, said computer program product comprising a computer-useable medium having computer program logic recorded thereon, said computer program logic including means for processing input signals and means for transmitting output signals, said input signals including input signals received from said ship motion sensor, said payload swing sensor, and said crane geometry sensors, said means for processing including means for calculating solutions pertaining to cancellation of the motion of said ship and means for calculating solutions pertaining to damping of the pendulation of said payload, said output signals being based on said processing of said input signals, said output signals being for controlling the slew angle of said boom, the luff angle of said boom, the length of said payload hoist line, the length of said rider block lift line, the length of said left tagline, and the length of said right tagline.

7 more elements

Dependencies are inferred from the claim text.