About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
Material-independent Flowrate Control in Extrusion-based Additive Manufacturing |
Author(s) |
Ali Asghari Adib, David John Hoelzle |
On-Site Speaker (Planned) |
Ali Asghari Adib |
Abstract Scope |
Precise control of the material flowrate is important for shape fidelity of manufactured parts in material extrusion (MEX). Existing ad hoc and learning-based flowrate control schemes are dependent on the rheological properties of the build material and the extrusion parameters, requiring recalibration with any changes in the set parameters. Previously, we have reported on a pressure-based proportional feedback control scheme for flowrate control in direct-write (DW) MEX. However, proportional control is model-free, has a non-zero steady-state error in reference tracking, and might induce instability at high gains by reducing the gain margin. Here, we utilize loop shaping control design to guarantee consistent flowrate control regardless of the rheological properties of MEX build material. Classical frequency-based methods are used to design controllers for the desired loop shape in simulation. The control schemes are validated experimentally on a DW MEX system to manufacture multi-material parts demonstrating enhanced material- and nozzle size-independent performance. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |