• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.4
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• pp.471-479
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• 2010

A holonomic drive can provide rotational and translational acceleration simultaneously in any direction. For this reason the holonomic drive technology is very desirable in creating motion for any mobile platform and has many promising mobility applications in the field of robotics and automation where manipulability is critical issue especially when the mobile system is operated in obstacle prone environment. In this paper a pragmatic methodology for realizing a holonomic drive system using multiple servo-casters is presented. The steering and driving of each servo-caster is controlled such that they are coordinated with the motions of other servo-casters in order to realize holonomic motion. This paper also proposes algorithms for varying manipulability as operation situation demands.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.04a
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• pp.766-771
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• 1997

In this strip casting,size of the roll separating force is a index representing the solidifying status of the melt. Rolling forces at the start of the casting process can change abruptly due to the overcooling of the leader strip. This inconsistensy leads to machine damage or deficient solidification which results in the failure of the casting. In this study, a mathematical model is derived for the hydraulic servo pressure control system for the twin roll strip caster and its parameters are estimated by the RLS algorithm. Based on the identified model, an one-step ahead predictive control method is applied in order to minimize the transient fluctuation of the rolling force. Its simulation results are compared with those of the conventional PI controllers.