Modeling of a closed-loop controlled laser machining process with different control strategies

Andreas Penz; Doris Leidinger; Dieter Schuoecker

doi:10.1117/12.184734

7 September 1994 Modeling of a closed-loop controlled laser machining process with different control strategies

Andreas Penz, Doris Leidinger, Dieter Schuoecker

Proceedings Volume 2207, Laser Materials Processing: Industrial and Microelectronics Applications; (1994) https://doi.org/10.1117/12.184734
Event: Europto High Power Lasers and Laser Applications V, 1994, Vienna, Austria

Abstract

In designing classical controllers it is necessary to assume that the parameters of the system are reasonably well known. However the ablation process involves inherent nonlinearities and significant uncertainties in the model parameters, which are one of the main problems for designing an appropriate controller. Nonlinearities occur e.g. due to the chemical processes or due to the changing the absorption or the gas flow. The concentration of added oxygen to the assisting gas stream influences the system behavior significantly. It will be shown that the nonlinearities depend on the process parameters. A simplified nonlinear process model based on an analytical investigation is presented and discussed. To get a glimpse of the time constants, nonstationary investigations are carried out. The best way to control such a complex nonlinear system is to use an input-output map. This can be settled with an experimental off- loop identification or by fuzzy inference. A fuzzy controller itself has a nonlinear behavior and allows designing an appropriate controller without any mathematical model of the process.

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Andreas Penz, Doris Leidinger, and Dieter Schuoecker "Modeling of a closed-loop controlled laser machining process with different control strategies", Proc. SPIE 2207, Laser Materials Processing: Industrial and Microelectronics Applications, (7 September 1994); https://doi.org/10.1117/12.184734

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KEYWORDS

Process modeling

Oxidation

Oxygen

Absorption

Oxides

Process control

Control systems

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