Auto-tuning and adaptive control of sheet metal forming

This paper describes the design and implementation of automatic controller tuning and model reference adaptive control (MRAC) to improve part quality in stamping and extends previous work on a manually-tuned fixed-gain process controller. Automatic tuning is described with a discussion of implementa...

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Bibliographic Details
Published in:Control engineering practice 2012-02, Vol.20 (2), p.156-164
Main Authors: Lim, Yongseob, Venugopal, Ravinder, Galip Ulsoy, A.
Format: Article
Language:English
Subjects:
Adaptative systems
Algorithms
Applied sciences
Auto-tuning
Computer science
control theory
systems
Computer simulation
Control system analysis
Control system synthesis
Control theory. Systems
Design engineering
Disturbances
Exact sciences and technology
Forming
Mathematical models
Metals. Metallurgy
Model reference adaptive control
Press forming of metal foils and wires
Process dynamics and disturbances
Production techniques
Recursive least squares
Sheet metal
Stamping
Stamping (Sheet Metal Forming)
Tuning
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Summary:This paper describes the design and implementation of automatic controller tuning and model reference adaptive control (MRAC) to improve part quality in stamping and extends previous work on a manually-tuned fixed-gain process controller. Automatic tuning is described with a discussion of implementation issues in the presence of plant disturbances. Design of a direct MRAC, whose controller gains are continuously adjusted to accommodate changes in process dynamics and disturbances, is investigated, including simulation-based robustness analysis of the adaptation law and a consideration of constrained estimation in the recursive least squares algorithm to address practical implementation issues. The performance of the MRAC process controller designed through simulation is experimentally validated. Good tracking of the reference process variable (i.e., punch force), and significant part quality improvement in the presence of disturbances, is achieved.
ISSN:0967-0661
1873-6939
DOI:10.1016/j.conengprac.2011.10.006