Method and equipment for controlling the operations of a crane

Details Method and equipment for controlling the operations of a crane Method and equipment for controlling the operations of a crane

1997-08-04

1998-09-15

Brahan, Thomas J.

Traversing hoists

Methods

212273, 212274, 212275, 212316, B66C 1900

Patent

active

058066969

ABSTRACT:
A method for controlling the motion of a crane lifting carriage, or trolley, a load suspended from it, a swing damping system, and/or an operator control cab whereby an ideal sequence of accelerations for moving the lifting carriage is defined that will bring the load to a swing-free condition at the end of the sequence of accelerations, and corresponding lifting carriage speed change signals are developed. A pendulum swing angle of the load corresponding with the ideal sequence of lifting carriage accelerations is calculated. The swing angle calculation and a geometric model of the swing damping system are used to determine a swing damping system control signal which makes the swing damping system follow the swing angle of the load. The lifting carriage speed change signal is applied to the traversing motor and the swing damping system control signal is applied to the swing damping equipment whereby the swing damping equipment allows the load to swing at the determined pendulum swing angle and damps only load swing that deviates from the determined pendulum swing angle. The swing angle calcualtion is also used to move the contol cab so that it follows the load movement rather than the lifting carriage movement.

REFERENCES:
patent: 4603783 (1986-08-01), Tax et al.
patent: 5117992 (1992-06-01), Simkus et al.
patent: 5490601 (1996-02-01), Heissat et al.

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