Abstract:

This paper is concerned with the fault detection problem of descriptor systems. First, an approach is proposed to design a normal observer based residual generator for descriptor systems by exploring the relationship between parity space based and observer based residual generators. It is then shown that the full decoupling problem can be easily solved with this approach. Finally, a model-free approach is given to directly identify parity space based or observer based residual generators from input and output data of descriptor systems and the order reduction of the identified residual generators is discussed.