Method of Fault Identification in Nonlinear Systems Based on Optimal Control Methods

The problem of fault estimation in nonlinear dynamic systems under the external disturbances is studied. To solve the problem, the methods of optimal control based on transformation of the original system into the reducing model sensitive to the faults and insensitive to the disturbances. Unlike sliding mode observers which traditionally are used to solve this problem, the suggested approach allows dispense without high frequency switching. The developed theory is illustrated by the example.