Cascaded Control for Regulating Soot Geometry in Vapor-Phase Axial Deposition
American Society of Mechanical Engineers
ASME 2006 International Mechanical Engineering Congress and Exposition Dynamic Systems and Control, Parts A and B Chicago, Illinois
The development of a cascaded feedback control strategy for a vapor-phase axial deposition (VAD) process is investigated in this paper. VAD is a widely used process in the creation of high purity glass for optical fiber. In previous work a soot tip surface temperature controller was developed for the VAD process to reduce the effects of core soot temperature variation on deposition, leading to a more stable process. However, this approach did not address the need to regulate and link the deposition rates of the core and clad torches. To maintain a constant distance between the core and clad deposition surfaces, it is desired to have the core soot and clad soot depositing at the same linear speed to provide a more uniform product. This paper presents the design and development of a cascaded controller strategy and process model to couple and regulate the surface temperature and deposition rates of core and clad soot. Simulations for the process and control scheme demonstrate a potential improvement in the uniformity of the core and clad soot geometry over the soot product length.
Jenkins, Hodge E. and Nagurka, Mark L., "Cascaded Control for Regulating Soot Geometry in Vapor-Phase Axial Deposition" (2006). Mechanical Engineering Faculty Research and Publications. 220.