Output Feedback Stabilization For Nonlinear Systems

In this paper, we mainly study nonlinear output feedback controller, design and dis-turbance attenuation problem of time finite-dimensinal uncertain systems. It deals withnonlinear systems afected by uncertainties such as unkown constant parameters, time-varying disturbances and uncertain nonlinearties.The paper consists of four chapters.Firstly, we mainly introduce some related development situation and research back-ground.Secondly, the section deals with the problem of smooth output feedback for a classof nonlinear planner systems. Based on the Backstepping method and modified powerintegrator approach, construsts a nonlinear-gain observe, under mild assumptions, globalstabilization is achieved by smooth output feedback controllers.Furthemore, we foused on the smooth output feedback stabilization of uncontrollableplanar systems with zero dynamic with backstepping, recaling transform, meaanwhile weflexibly use the diferent Young's Inequality to guarantee the global sympotical stability ofthe closed-loops system.Finally, this setion shows that the problem of the high-order uncertain nonliear systemswith parameter systems. Based on the Lyapunov stability theory and desingned adaptivecontroller, adding a power integrator and using the parameter separation technique, ensurethe systems globally stabiliztion. Moreover, the example verifies the correctness and theefectiveness of the conclusion.