Reliable control of nonlinear systems

In this paper, we extend Veillette's results (1995) to the study of reliabl e linear-quadratic regulator problem for nonlinear systems. This is achieve d by employing the Hamilton-Jacobi inequality in the nonlinear case instead of algebraic Riccati equation in the linear one. The proposed state-feedba ck controllers are shown to be able to tolerate the outage of actuators wit hin a prespecified subset of actuators. Both the pain margins of guaranteei ng system stability and retaining a performance bound are estimated.