🚀 go-pugleaf

Hualin Tan wrote:
> 
> On 6 Aug 1997, Klaus Bernhard wrote:
> 
> > Why would one use state feedback ( and therewith Kalman filtering)
> > instead of output feedback, when I can feed my controller with the
> > latter one directly instead of estimating the states with an observer
> > and so on...?
> >
> > Klaus
> > --
> > Klaus Bernhard
> > Institut f�r Kraftfahrwesen Aachen      ika      Department of
> > Automotive Engineering
> > RWTH Aachen
> > University of Technology Aachen, Germany
> >
> > Please remove the '_no'-string from my
> > email adress if you reply directly
> > klausb@ika.rwth-aachen.de
> >
> >
> 
> Well, there are many reasons for using state feedback
> instead of output feedback. One of them is that there
> may be unstable modes that are uncontrollable from the
> output, but can be controlled by other states. In
> classical control where only input-output information
> (i.e., the transfer function) is used, one usually cannot
> obtain satisfactory performance by using P-control alone.
> A compensator, which somehow can be regarded as a
> state feedback with state-estimator, is generally necessary.
> 
> Hualin Tan
> ECE, JHU
Hi:

Agree with you but SS methods depend highly on the process model, how do
you compensate the control system for process modeling errors so you get
a system able to cup with time varying model inaccuracies?

Regards

Jaime Ramirez