[[abstract]]In this paper, robust output feedback stabilizing controllers are developed for computer control of decentralized singularly-perturbed systems without state estimation devices. The developed techniques will be suitable for decentralized large-scale and high-dimension systems with strong potential for practical applications, such as aircraft, power distribution and communication networks. Moreover, the controllers are expected to satisfy following criteria: (1) computer control, (2) decentralized control, (3) robust control, (4) stabilizing control, (5) reliable control, (6) reduced-order control, and (7) output feedback control. The analog to digital transformation technique is used to convert continuous-time state models to discrete-time domain for digital control use. Singular perturbation methods are applied to reduce the order of the system. The concept of Riccati equation approach will be applied to stabilize the systems. Moreover, the robustness test will be fulfilled to understand the robustness bound of thesystem, and reliable control investigation will be performed to show the reliability of the system.
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