Coordinated Control of a Planar Dual-Crane Non-Fully Restrained System

In this dissertation a control scheme that would provide motion compensation for a ship-based two-crane system suspending a single payload was developed. Historical experience during the conflict in Vietnam, along with the introduction of standard containerized packaging have steered military sustai...

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description In this dissertation a control scheme that would provide motion compensation for a ship-based two-crane system suspending a single payload was developed. Historical experience during the conflict in Vietnam, along with the introduction of standard containerized packaging have steered military sustainment logistics towards a reliance on commercially developed cranes for discharge of containers - even for instream lightering operations. With the inclusion of Seabasing as one of the Navy's pillars, there has been a resurgence in interest in cargo transfer technology. While several approaches to the movement of individual containers have been pursued, there has not been a similar focus on the handling of outsize cargo in the military logistics-over-the-shore (LOTS) operating environment. In the body of this work is an algorithm for the coordinated control of two cranes to facilitate the movement of cargo. The use of multiple cranes may be required by either the geometric extent or the weight of the cargo. The kinematic chain is developed for the incompletely-restrained cable-suspended system that describes this system. With the inclusion of the dynamics of the system to fully describe the force and moment constraints, the equations of motion can be inverted to yield expressions that relate desired payload motion to crane control inputs. The presence of seaway induced motions on the ship platform introduces disturbances that must be accounted for in the kinematics of the ship-attached crane reference frame and be compensated for by the dual-crane system. Without this motion compensation, the operational capability is limited by the environment. With this system the payload is isolated from the ship motion and held fixed in inertial space.
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Historical experience during the conflict in Vietnam, along with the introduction of standard containerized packaging have steered military sustainment logistics towards a reliance on commercially developed cranes for discharge of containers - even for instream lightering operations. With the inclusion of Seabasing as one of the Navy's pillars, there has been a resurgence in interest in cargo transfer technology. While several approaches to the movement of individual containers have been pursued, there has not been a similar focus on the handling of outsize cargo in the military logistics-over-the-shore (LOTS) operating environment. In the body of this work is an algorithm for the coordinated control of two cranes to facilitate the movement of cargo. The use of multiple cranes may be required by either the geometric extent or the weight of the cargo. The kinematic chain is developed for the incompletely-restrained cable-suspended system that describes this system. With the inclusion of the dynamics of the system to fully describe the force and moment constraints, the equations of motion can be inverted to yield expressions that relate desired payload motion to crane control inputs. The presence of seaway induced motions on the ship platform introduces disturbances that must be accounted for in the kinematics of the ship-attached crane reference frame and be compensated for by the dual-crane system. Without this motion compensation, the operational capability is limited by the environment. 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source DTIC Technical Reports
subjects CARGO HANDLING
COMPENSATION
Construction Equipment, Materials & Supplies
CONTAINERIZING
Couplers, Fasteners, and Joints
CRANES
EQUATIONS OF MOTION
HANDLING
HISTORY
INERTIA
INVERSE KINEMATIC CONTROL
KINEMATICS
LOGISTICAL OPERATIONS
LOTS(LOGISTICS-OVER- THE-SHORE)
Marine Engineering
MINIMUM NORM SOLUTION
MOTION COMPENSATION
PACKAGING
PAYLOAD
PLATFORMS
RESTRAINT
SHIP MOTION
SHIPBOARD CRANES
TECHNOLOGY TRANSFER
THESES
title Coordinated Control of a Planar Dual-Crane Non-Fully Restrained System
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