A computational method for simultaneous LQ optimal control design via piecewise constant output feedback

This paper is concerned with simultaneous linear-quadratic (LQ) optimal con trol design for a set of LTI systems via piecewise constant output feedback . First, the discrete-time simultaneous LQ optimal control design problem i s reduced to solving a set of coupled matrix inequalities and an iterative LMI algorithm is presented to compute the feedback gain. Then, simultaneous stabilization and simultaneous LQ optimal control design of a set of LTI c ontinuous-time systems are considered via periodic piecewise constant feedb ack gain. It is shown that the design of a periodic piecewise constant feed back gain simultaneously minimizing a set of given continuous-time performa nce indexes can be reduced to that of a constant feedback gain minimizing a set of equivalent discrete-time performance indexes. Explicit formulas for computing the equivalent discrete-time systems and performance indexes are derived. Examples are used to demonstrate the effectiveness of the propose d method.