Abstract:

Based on the H∞ control theorem, by introducing the H∞ performance index, a novel roubst adaptive observer using Lyapunov approach is designed for a class of MIMO linear timevarying systems with parameter uncertainties. By designing two differenent adaptive fault estimation laws and comparing with each other， several factors influencing the performance of fault estimation for the class of adaptive observer are obtained. The designed adaptive observer is used to the problem of fault accommodation for a class of linear timevarying systems with parameter uncertainties, and the fault estimation error is ultimately bounded uniformly and satisfies the prescribed H∞ performance index. The simulation result for a flight control system illustrates the effectiveness and feasibility of the proposed method.