Abstract
This paper deals with a study on a vibration control system using propellers for crane load and development of the system for life-size crane load. Vibration suppression of crane load suspended by hoisting rope is an important issue to speed-up crane operation. In this study, a novel vibration control system using propeller thrust as control forces is presented. The variable-pitch propeller device is attached crane load, and control vibration suppression of crane load by add forces to crane load directly. The pitch of the propeller can be varied so that the attack angle of the propeller blade possesses negative or positive. The normal propeller must switch on or off of the device repeatedly, so that rising properties of the force of propeller is bad. Variable-pitch propeller solved this problem. Changing the attack angle, the direction of thrust can be altered smoothly without changing on-off of the device. Based on such conceptual design, a life-size experimental device was designed precisely and produced.
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