Version 1.0, August 31, 2001, Copyright, Hugh Jack 1993-2001
· By separating out error control, and process modeling functions we can make a system that is more accurate, with reduced steady state error.
· This technique may be used when we have a process model, and the input will not be changing suddenly (The feedback error controller will tend to overcompensate).
· We do this using a system of the form below,
· The relevant transfer functions are,
· The feedback error controller can be selected to reduce the errors. The typical design technique is, to design for minimal error or disturbance.
· Develop the system transfer function (given before) for a command feed forward controller
