| About this Abstract |
| Meeting |
2019 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2019)
|
| Symposium
|
2019 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2019)
|
| Presentation Title |
Can We Control the Temperature History in Powder Bed Fusion? A Linear Systems Theory Study of the Powder Bed Fusion Process |
| Author(s) |
Nathaniel Wood, David Hoelzle |
| On-Site Speaker (Planned) |
Nathaniel Wood |
| Abstract Scope |
Powder Bed Fusion (PBF) is a type of Additive Manufacturing (AM) technology that builds parts in a layer-by-layer fashion out of a metal powder bed via the selective melting action of a laser or electron beam heat source. Despite its rapid adoption, part temperature regulation in PBF is largely open loop, designed primary by heuristic methods. This paper uses linear systems theory to investigate two fundamental control properties of PBF: controllability and observability, which are metrics that determine if all the target dynamics (temperatures in PBF) can be controlled in a process. The main result is that PBF is stabilizable, detectable, and structurally controllable (observable) provided that any portion of the build is exposed to the heat source and thermal camera measurement. These properties are shown to hold in both time-invariant and time-varying models. The guarantee of controllability and observability provides a path for multivariable process temperature estimation and control. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |