Talk on "Advancing 3D Printing using Control Theory"

Speaker: Dr. Keval Ramani, Research Fellow at the University of Michigan, Ann Arbor, USA.

Title: Advancing 3D Printing using Control Theory

Abstarct: Basis functions (BFs) are used extensively in control engineering. For example, they are used to tackle various challenges in feedforward, iterative learning, and model predictive control, to mention a few. In these and other similar applications, the standard practice is to solve a given control problem by pre-selecting a set of BFs (from a wide range of available options) based on user preference or engineering intuition. Case in point is the emerging filtered basis functions (FBF) approach for feedforward tracking control of nonminimum phase systems using BFs. Rather than the standard practice of arbitrarily selecting BFs, in this talk, I will present a rigorous framework for selecting optimal BFs that minimize control effort or maximize robustness for a desired level of tracking accuracy using the FBF approach. The optimal BFs have been shown in simulations and experiments on 3D printers to yield orders of magnitude improvement in control efficiency and robustness compared to popular BFs like B-splines, while maintaining the same level of (nominal) tracking accuracy. Extensions of my work to parallel configuration 3D printers, extrusion control, metal-based additive manufacturing, big area additive manufacturing, control of nonlinear systems and learning control will also be discussed.

Speaker Bio: Dr. Keval S. Ramani is a Research Fellow at the University of Michigan, Ann Arbor, USA. He completed his Ph.D. and M.S. from University of Michigan in 2019 and 2015, respectively, and B.E. from BITS Pilani, Goa Campus, India, in 2012. From 2012 to 2013, he worked with Ingersoll Rand, based in Bengaluru, India, as an Engineering Trainee. His research interests are in dynamic systems and control, with application to 3D printing automation. He is a co-author of the best student paper award winning paper on FBF at the 2015 ASME Dynamic Systems and Control Conference. He is also a member of the IEEE/ASME Transactions on Mechatronics Junior Reviewer Program.

Event Date: 19th November, 2020(Thursday)

Event Time: 10:00 AM

Venue: Online seminar - link

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