The equality constraints correspond to correlations shown in the Steady-State Correlations section and the inequality constraints correspond to the manipulated variable
and robust stability constraints as stated in Equations (50), (51) and (15), respectively.
where [c.sub.10] - a coefficient limiting the value of the manipulated variable
from the top at time moment zero.
The selection of manipulated variables
was based on the applicability in the reactive polymer extrusion process.
The response, y(t), the measured output, [y.sub.n](t), and the manipulated variable
, u(t), are shown in Figure 10.
[A.sub.2] and [A.sub.3] represent an added 60% change in the manipulated variable
from [A.sub.1] and a -50% change from [A.sub.2].
The flow rate of the heating medium in a preheater located upstream of the reactor is the manipulated variable
. Here, the primary and secondary processes have similar time constants.
Time delays e between a change on the manipulated variable
and its effect on whitewater consistency could not be recorded precisely; nevertheless an estimated measurement delay of 20 s has been approximated for all the steps.
Each independent manipulated variable
must be perturbed in turn and steady-state waited for after each perturbation.
In the absence of disturbances and prediction horizon N, the plant output y(t) can be evaluated as a convolution of the step response coefficients and the changes in the manipulated variable
This paper deals with the proposal and application of the predictive control with the constraint of the manipulated variable
to the control of the nonlinear time varying system the laboratory model DR300.
A HEN may be considered a multivariable system problem, involving at least one process variable or controlled variable (cv), in this case the target temperature (TT) attained through a process-to-process heat exchanger, and one or more potential manipulated variables
[VO.sub.t]: manipulated variable
, the percentage of the valve opening at sampling instance t, and