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Model For A Nonlinear Tank System Under Proportional-Integral-Derivative Control, Charles W. Bishop
Model For A Nonlinear Tank System Under Proportional-Integral-Derivative Control, Charles W. Bishop
Retrospective Theses and Dissertations
A model (NONLINRK) was developed for a closed tank system under feedback control by an ideal proportional-integral-derivative controller. Under servo action the fluid level in the tank is altered from its equilibrium set point. Under regulatory action the feed pressure to the inlet valve and/or the outlet valve percentage opening are varied from equilibrium settings. The numerical model uses Gill’s fourth-order Runge-Kutta algorithm to solve the system equation. The equation was made separable by approximating an exponential factor by the tangent at the beginning of each time step in the numerical solution. NONLINRK simulation trials exhibited many characteristics of linear …