Papers by Keyword: Uncertainty Model

Abstract: On the basis of multi-axle vehicle 3-DOF dynamic model, and using leaning stiffness of each wheel and external disturbance as uncertainty parameters, variable structure control theory was used to make the actual variable model track the optimal theoretical model primely. The results of the simulation indicate that this method is feasible, and the impact to the system stability from parameters perturbation and external disturbance could be overcome by this control system.

Abstract: Abstract.For the control unit in a control system, under a certain type of perturbations, including the disturbance of its own model, the property that system maintains certain performance parameter to designed index is defined as robustness. A designed system is robust when its response does not dissatisfy design requirements under model parameter variations.In practical application, it is not unusual that some parameters of system model are not precisely known. Such parameter is defined as uncertain parameter, because its value varies within a given range, even though its nominal value and variation range are known.In this article, in order to design a robust control system, MATLAB is utilized to perform robustness analysis by establishing an uncertainty model of DC motor.

Abstract: Stabilization of a plant in case of uncertainty parameters and unmodeled dynamics are the main problems considered in this paper. A robust control of motion of a rigid shaft that is supported by magnetic bearings was used as an example. The dynamics of the active magnetic suspension system is characterized by instability and uncertainty. The uncertainty is modeled as an additive and multiplicative. Robust controller H∞ was designed for the defined plant with the uncertainty models. The robust controller assures high quality of control despite the uncertainty models. Robust control of vibrations of a rigid rotor is confirmed by experimental studies. A digital signal processor is used to execute the control algorithm in real time.