REDUCTION IN OSCILLATION OF A SUSPENDED LOAD IN OVERHEAD CRANES

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. IV TO MY WIFE, PARENTS A