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Hierarchical optimal force-position control of a turning Process

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3 Author(s)
Pandurangan, B. ; Dept. of Mech. & Aerosp. Eng., Univ. of Missouri, Rolla, MO, USA ; Landers, R.G. ; Balakrishnan, S.N.

Machining process control technologies are currently not well integrated into machine tool controllers and, thus, servomechanism dynamics are often ignored when designing and implementing process controllers. In this brief, a hierarchical controller is developed that simultaneously regulates the servomechanism motions and cutting forces in a turning operation. The force process and servomechanism system are separated into high and low levels, respectively, in the hierarchy. The high-level goal is to maintain a constant cutting force to maximize productivity while not violating a spindle power constraint. This goal is systematically propagated to the lower level and combined with the low-level goal to track the reference position. Since the only control signal (i.e., motor voltage) resides at the lower level, a single controller is designed at the bottom level that simultaneously meets both the high- and low-level goals. Simulations are conducted that validate the developed methodology. The results illustrate that the controller can simultaneously achieve the low-level position tracking goal and the high-level force-tracking goal.

Published in:

Control Systems Technology, IEEE Transactions on  (Volume:13 ,  Issue: 2 )

Date of Publication:

March 2005

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