Abstract
In this paper, we develop a new H 2 semistability theory for linear dynamical systems. Specifically, necessary and sufficient conditions based on the new notion of weak semiobservability for the existence of solutions to the semistable Lyapunov equation are derived. Unlike the standard H 2 optimal control problem, a complicating feature of the H 2 optimal semistable control problem is that the semistable Lyapunov equation can admit multiple solutions. We characterize all the solutions using matrix analysis tools. With this theory, we present a new framework to design H 2 optimal semistable controllers for linear coupled systems by converting the original optimal control problem into a convex optimization problem.
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