Mekanik sistemlerde gözlemci tabanlı sürtünme giderimi

In real life feedback control applications of mechanical systems, friction and time delays are two important issues that might have direct e ects on the performance of systems. Hence, an adaptive nonlinear observer based friction compensation for a special time delayed system is presented in this thesis. Considering existing delay, an available Coulomb observer is modi ed and closed loop system is formed by using a Smith predictor based controller as if the process is delay free. Implemented hierarchical feedback system structure provides two-degree of freedom and controls both velocity and position separately. For this purpose, controller parametrization method is used to extend Smith predictor structure to the position control loop for di erent types of inputs and disturbance attenuation. Simulation results demonstrate that without requiring much information about friction force, the method can signi cantly improve the performance of a control system in which it is applied.