Feedback control systems, Root locus method
A root locus graphics routine was written in Turbo Pascal for the analysis and design of a linearized dual tank control system. The routine is a subprogram to be incorporated with an editor written by L. Fadden. This editor allows for the saving and changing of parameters to the system.
The dual tank system is a good example for classical feedback control analysis. A brief description of the process and system is presented. The system may be described by linearized differential and algebraic equations. From these, a characteristic equation is derived, which gives rise to the root locus. The root locus is a plot of the poles of the closed loop system. Poles or roots of the characteristic equation are found using the Lin-Bairstow algorithm. This method may be used to solve for the zeroes of an nth degree polynomial.
The root locus plotter was exercised by attempting to optimally tune the system’s controller. Corroboration of the results was provided by step response plots from the TUTSIM simulation program.
Minor modifications allow the root locus plotter to run without the editor. Graphics subroutines are provided by the Turbo Graphix Toolbox. When run under the editor, the plotter is one interactive design module of the dual tank system analysis and design program. The subprogram was designed principally for user ease, error checking, and effective graphics.
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Master of Science (M.S.)
College of Engineering
Length of Campus-only Access
Masters Thesis (Open Access)
Decatrel, John M., "Root Locus Plotter for a Dual Tank System Under Feedback Control" (1986). Retrospective Theses and Dissertations. 4897.
Contributor (Linked data)
Klee, Harold [VIAF]
Klee, Harold [LC]