Compute Open-Loop Response
The open-loop response of a control system is the combined response of the plant and the
controller, excluding the effect of the feedback loop. For example, the following block
diagram shows a single-loop control system.If the controller, C(s), and plant, P(s), are linear, the corresponding open-loop transfer
function is C(s)P(s).To remove the effects of the feedback loop, insert a loop opening analysis point without
manually breaking the signal line. Manually removing the feedback signal from a
nonlinear model changes the model operating point and produces a different linearized
model. For more information, see “How the Software Treats Loop Openings” on page 2-
44.If you do not insert a loop opening, the resulting linear model includes the effects of the
feedback loop.To specify the loop opening for this example, you can use either of the following analysis
points.2 Linearization