0
research-article

Two-Dimensional Modeling and System Identification of the Laser Metal Deposition Process

[+] Author and Article Information
Patrick Sammons

Missouri University of Science and Technology, Rolla, MO 65409 USA
pmsd44@mst.edu

Douglas Bristow

Missouri University of Science and Technology, Rolla, MO 65409 USA
dbristow@mst.edu

Robert Landers

Missouri University of Science and Technology, Rolla, MO 65409 USA
landersr@mst.edu

1Corresponding author.

ASME doi:10.1115/1.4041444 History: Received May 27, 2017; Revised September 06, 2018

Abstract

Additive Manufacturing (AM) processes fabricate parts by adding material in a layer-by-layer fashion. In order to enable closed-loop process control - a major hurdle in the adoption of most AM processes - compact models suitable for control design and for describing the layer-by-layer material addition process are needed. This paper proposes a two-dimensional modeling framework whereby the deposition of the current layer is affected by both in-layer and layer-to-layer dynamics, both of which are driven by the state of the previous layer. The proposed framework can be used to describe phenomena observed in AM processes such as layer rippling and large defects in Laser Metal Deposition (LMD) processes. Further, the proposed framework can be used to create two-dimensional dynamic models for the analysis of layer-to-layer stability and as a foundation for the design of layer-to-layer controllers for AM processes. In the application to LMD, a two-dimensional Linear-Nonlinear-Linear (LNL) repetitive process model is proposed that contains a linear dynamic component, which describes the dynamic evolution of the process from layer to layer, cascaded with a static nonlinear component cascaded with another linear dynamic component, which describes the dynamic evolution of the process within a given layer. A methodology, which leverages the two-dimensional LNL structure, for identifying the model process parameters is presented and validated with quantitative and qualitative experimental results.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In