International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2557

Full Length Research Paper

Comparative modeling of CO2 laser cutting using multiple regression analysis and artificial neural network

Miloš Madić* and Miroslav Radovanović
Department of Production Engineering, Faculty of Mechanical Engineering, University of Niš, Niš, Serbia.
Email: [email protected]

  •  Accepted: 02 April 2012
  •  Published: 30 April 2012



In this paper, empirical modeling of surface roughness in CO2 laser cutting of mild steel using the multiple regression analysis (MRA) and artificial neural network (ANN) waspresented. To cover wider range of laser cutting parameters such as cutting speed, laser power and assist gas pressure as well as to obtain experimental database for MRA and ANN model development, Taguchi’s L25 orthogonal array was implemented for experimental plan. The average surface roughness was chosen as a measure of surface quality. The mathematical models of surface roughness developed by MRA and ANN were expressed as explicit nonlinear functions of the selected input parameters. The comparison between experimental results and models predictions showed that ANN model provided more accurate predictions when compared with the MRA model. The use of MRA for surface roughness prediction in COlaser cutting was of limited applicability and reliability. Powerful modeling ability of the ANNs justified the use of the ANN models for accurate modeling of the complex processes with many non-linearities and interactions such as CO2 laser cutting. Finally, based on the derived ANN equation, the effects of the laser cutting parameters on surface roughness were examined.


Key words: Surface roughness, CO2 laser cutting, multiple regression analysis, artificial neural networks.