Abstract:
REDUCTION IN OSCILLATION OF A SUSPENDED
LOAD IN OVERHEAD CRANES
By
Tahir Ilyas
Movement of heavy loads using overhead cranes is a very important process in
industry. Moving a suspended load causes undesirable swings which develop
oscillations. It is desirable to reduce amplitude of Oscillation at the beginning and
termination of desired movement.
The objective of this research was to utilize the experts knowledge and design a
system for efficient control of crane with minimum load oscillations. Two
approaches have been used to control the crane
1. Open Loop Drive signal Shaping
2. Closed loop Drive signal Shaping
Open loop method is limited to ensuring that the load will not be oscillating or
have minimal swing after a transition from its rest position to another constant
speed( provided that the load was initially not swinging). In this technique, it has
been kept in mind that the acceleration / deceleration must remains gradual to
prevent jerking to suspended load. The hardware has also been implemented for
this technique.
In closed loop method, Fuzzy logic has been used to utilize hoist angle for
generating feedback to control movement of trolley. Hardware implementation
has not been done, however its working efficiency has been demonstrated
through simulation.
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