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 paper, a hierarchical controller is developed that simultaneously regulates the servomechanism positions and cutting forces in a lathing 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 there are only control signals at the lower level, in this case the motor voltages, a single controller is designed at the bottom level that will meet both the high level and low level goals. Simulations are conducted to validate the developed methodology.
A. Dasgupta et al., "Hierarchical Optimal Control of a Turning Process - Linearization Approach," Proceedings of the 2003 American Control Conference, 2003, Institute of Electrical and Electronics Engineers (IEEE), Jan 2003.
The definitive version is available at http://dx.doi.org/10.1109/ACC.2003.1243470
2003 American Control Conference, 2003
Mechanical and Aerospace Engineering
Keywords and Phrases
Controllers; Cutting; Cutting Forces; Force Control; Force Process; Hierarchical Controller; Hierarchical Optimal Control; Hierarchical Systems; Lathe Operation; Lathes; Linearisation Techniques; Linearization; Machine Tool Controller; Machining Process Control; Motor Voltages; Optimal Control; Position Control; Process Control; Servomechanism; Servomechanisms; Spindle Power Constraint; Turning (Machining); Turning Process
International Standard Serial Number (ISSN)
Article - Conference proceedings
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