摘要: In this paper, the singular perturbation approach is used to study diagnosability of linear two-time scale systems. Based on a power series expansion slow manifold arounde = 0, higher order corrected models for both and fast subsystems are obtained. The decomposed vary with respect different corrected-order models. It shown that if original singularly perturbed system fault diagnosable, composite observer-based residual generator actuator faults can be synthesized from observers two separate subsystems. An example liner worked out illustrate methodology.