Control of the Vertical Gradient Freeze crystal growth process via backstepping
arXiv:2002.11447 · doi:10.1016/j.ifacol.2020.12.1537
Abstract
This contribution presents a backstepping-based state feedback design for the tracking control of a two-phase Stefan problem which is encountered in the Vertical Gradient Freeze crystal growth process. A two-phase Stefan problem consists of two coupled free boundary problems and is a vital part of many crystal growth processes due to the time-varying extent of crystal and melt during growth. In addition, a different approach for the numerical approximation of the backstepping transformations kernel is presented.
7 pages, 4 figures. Accepted to the 21st IFAC World Congress