About this Abstract |
| Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
|
| Symposium
|
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
|
| Presentation Title |
Adaptive Feed Forward Control of Mass Flow for Powder-Blown Directed Energy Deposition |
| Author(s) |
Neel Shah, Jin Yeon Kim, Aaron Stebner, Zachary Brunson |
| On-Site Speaker (Planned) |
Neel Shah |
| Abstract Scope |
Achieving precise material composition in multi-material powder-blown directed energy deposition (PB-DED) is often hindered by powder flow fluctuations, particularly periodic disturbances originating from rotary feeders, which compromise compositional accuracy. To address these challenges, this work introduces an adaptive control strategy. The proposed architecture integrates an adaptive feedforward controller to cancel periodic disturbances alongside an adaptive Smith predictor, augmented with Model Reference Adaptive Control (MRAC), designed to compensate for measurement delays and adapt to changing system dynamics. Controller stability is ensured through adaptation laws derived using Lyapunov theory. Performance was evaluated via Monte Carlo simulations employing a dynamic model with significant parameter drift and uncertainty. Results demonstrate that the adaptive controller consistently achieves approximately a 50% reduction in the steady-state mass flow rate Root Mean Square Error compared to a baseline integral controller, while also exhibiting strong robustness. This approach enables accurate and precise material delivery needed for reliable multi-material PB-DED. |
| Proceedings Inclusion? |
Planned: Post-meeting proceedings |