Stability analysis of uncertain systems via matrix-valued Liapunov functions

In this paper, a new approach is given that is applied in the investigation of qualitative motion properties of systems whose parameters are prescribed unprecisely (uncertain systems). The general method of investigation is to construct sufficient conditions under which uncertain system motions possess a certain type of stability. In this work the main method of analysis for this class of systems is a generalized direct Lyapunov method based on matrix-valued auxiliary functions.