A multi-objective iterative learning control approach for additive manufacturing applications. (July 2017)

• Record Type: Journal Article
• Authors: Lim, Ingyu; Hoelzle, David J.; Barton, Kira L.
• Is Part Of: Control engineering practice. Volume 64(2017)
• Page Start: 74
• Page End: 87
• Publication Date: 2017-07
• Subjects: Iterative learning control -- Multiple objective -- Spatial domain -- Additive manufacturing -- Electrohydrodynamic Jet Printing; Automatic control -- Periodicals; 629.89
• DOI: 10.1016/j.conengprac.2017.03.011
• Languages: English
• ISSNs: 0967-0661

Abstract

Abstract: Iterative learning control (ILC) is a method for improving the performance of stable, repetitive systems. Standard ILC is constructed in the temporal domain, with performance improvements achieved through iterative updates to the control signal. Recent ILC research focuses on reformulating temporal ILC into the spatial domain, where 2D convolution accounts for spatial closeness. This work expands spatial ILC to include optimization of multiple performance metrics. Performance objectives are classified into primary, complementary, competing, and domain specific objectives. New robustness and convergence criteria are provided. Simulation results validate flexibility of the spatial framework on a high-fidelity additive manufacturing system model. Abstract : Highlights: Pareto spatial ILC is comprised of four categories of performance objectives. Multi-objective spatial ILC structure results in spatially varying learning filters. Multi-objective ILC design for additive manufacturing applications.