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- W2999460025 abstract "Powder Bed Fusion (PBF) is a type of Additive Manufacturing (AM) technology that builds parts in a layer-by-layer fashion out of a bed of metal powder via the selective melting action of a laser or electron beam heat source. The technology has become widespread, however the demand is growing for closed loop process monitoring and control in PBF systems to replace the open loop architectures that exist today. Controls-based models have potential to satisfy this demand by utilizing computationally tractable, simplified models while also decreasing the error associated with these models. This paper introduces a controls theoretic analysis of the PBF process, demonstrating models of PBF that are asymptotically stable, stabilizable, and detectable. We show that linear models of PBF are structurally controllable and structurally observable, provided that any portion of the build is exposed to the energy source and measurement, we provide conditions for which time-invariant PBF models are classically controllable/observable, and we demonstrate energy requirements for performing state estimation and control for time-invariant systems. This paper therefore presents the foundation for an effective means of realizing closed loop PBF quality control." @default.
- W2999460025 created "2020-01-23" @default.
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- W2999460025 date "2020-01-07" @default.
- W2999460025 modified "2023-09-27" @default.
- W2999460025 title "Temperature states in Powder Bed Fusion additive manufacturing are structurally controllable and observable." @default.
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