جستجوی مقالات مرتبط با کلیدواژه « state feedback » در نشریات گروه « برق »

This paper focuses on the control of uncertain switched linear systems with asynchronous switching in the presence of disturbance using an observer with average dwell time. For this purpose, firstly, an appropriate model for the system is introduced, The maximum allowed time of non-synchronism, the minimum average dwell time and the necessary conditions for system stability are determined, using pseudo-Lyapunov functions. The novelty of this research is taking into account several undesirable parameters, i.e. asynchronous switching, uncertainty, disturbance and lack of access to several variables, simultaneously. Considering these factors together increase the complexity of the problem. Finally, the effectiveness of the proposed algorithm is shown through the implementation of the method on the system of a flying object in the MATLAB simulation environment.

In this paper, a new approach is presented to design a gain-scheduled state-feedback controller for uncertain linear parameter-varying systems. It is supposed that the state-space matrices of them are the linear combination of the uncertain scheduling parameters. It is assumed that the existed uncertainties are of type of time-invariant parametric uncertainties with specified intervals. Simultaneous presence of the concepts of the gain-scheduling and the time-invariant uncertainties is a serious challenge. Because, the philosophy of the gain-scheduling is variability with time. But, the time-invariant parametric uncertainties are constant and unknown. To obviate this challenge, a robust state-feedback law is proposed that is robust against the time-invariant uncertainties. In this method, the arbitrary values are selected for the uncertainties from the defined intervals. But, the selected values are not necessarily equal to the true ones. Hence, the new scheduling parameters are presented to calculate the proposed controller. Finally, the proof of the proposed scheme is presented based on Lyapunov concept. To show the effectiveness of the final controller, the proposed method is simulated to stabilize the roll rate of a typical missile. Also, the simulation results are compared with the experimental ones in the presence of the INS (Inertial Navigation System) module.

This paper presents a robust-H∞ control design for semi-active vehicle suspension system using linear matrix inequality (LMI). In vehicle control systems, the ability of damping vibrations is very important against the external and internal disturbances. Generally, it is impossible to eliminate all of this disturbances. So, it is essential to use the robust control. In this study, the state feedback H∞ control for a semi-active quarter car suspension using an Electro-Rheological damper with spring and damper has been utilized. The dynamic system of the suspension systems is first formed in terms of the control objectives, i.e., ride comfort, road holding, suspension deflection, and maximum actuator control force. Furthermore, using Lyapanov theory and linear matrix inequality (LMI) approach, the existence of admissible controllers is formulated in terms of LMIs. Finally, a quarter-car vehicle model is exploited to demonstrate the effectiveness of the proposed method. A comparison of the results between the semi-active and passive suspension systems shows that the attenuation of the disturbance against the bump and stochastic input is obtained.