 
Summary: CCEC Seminar
Linear Quadratic Performance Criteria forLinear Quadratic Performance Criteria for
Cascade ControlCascade Control
Ather Gattami
Ph.D. Student, Lund University, Sweden
Friday, April 8th, 2005
4:00  5:00 pm
Engineering I Room 2162
ABSTRACT:
We consider the problem of linear quadratic regulator (LQR) performance for cascade control
structures of series coupled systems. The necessary and sufficient condition for the linear
quadratic performance of a cascade control structure to achieve the same performance as
any given centralized LQR is obtained. The cascade problem could be seen as a special case
of the network control problem with a special network structure. The results presented show
that decentralized control is possible with some natural fundamental limitations in this
particular case. Also, a constructive proof is given for the inverse LQR problem that can be
used to calculate the decentralized LQR from a given centralized one.
For more information, contact the CCEC at 8058937066 or ccec@ece.ucsb.edu
