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In this paper, the design problem of sliding mode observer is addressed for a class of linear continuous-time systems with actuator faults and limited data communication. A new descriptor sliding mode observer approach is developed to solve this design issue, where a discontinuous input is constructed to reject actuator faults. It is proved that the lower bound on the density of the quantizer is 1...
This paper focuses on the transition flight control for a small tilt rotor unmanned aerial vehicle (UAV). Aiming at the longitudinal model of a tilt rotor UAV, a novel sliding mode control (SMC) method is proposed to guarantee that the states converge to the desired sliding surfaces in finite time. Moreover, extended state observers (ESOs) are provided to enhance the system's robustness to the uncertainties...
Aiming at the time-varying load torque disturbance in the vibration displacement system of continuous casting mold driven by servo motor, an extended state observer (ESO) based backstepping sliding mode control method is proposed. Firstly, a mapping function is established to deal with the non-uniqueness of the nonlinear inverse relationship from eccentric shaft angle to mold displacement. Secondly,...
This paper develops a sliding mode control (SMC) approach for a class of uncertain nonlinear systems with unmatched uncertainties/disturbances. The newly proposed method is based on a novel fixed-time convergent sliding mode disturbance observer which can estimate the unmatched disturbance in a fixed time (time whose upper estimate is independent of the initial conditions). By designing a novel sliding...
For a class of fractional-order systems with uncertainty and disturbance, sliding mode control method is presented based on disturbance observer. To estimate the compound disturbance, extended fractional-order disturbance observer is proposed, which can compensate more extensive disturbances than vanishing disturbances. By using the sliding mode theory, fractional-order integral-type sliding mode...
For a novel conveying mechanism which is highly nonlinear, highly time-varying and highly coupled, a synchronized sliding mode control with nonlinear disturbance observer is proposed to improve the synchronization performance and the disturbance-rejection performance. First, the kinematic analysis of the conveying mechanism is completed and the dynamic model with lumped disturbances of the conveying...
In this paper, the problems of observer-based sliding mode control for a class of nonlinear system are investigated via Takagi-Sugeno (T-S) fuzzy approach. By using the T-S model as the design model, an adaptive sliding mode observer is first constructed to estimate the states of the original nonlinear system without knowing any information of the actuator fault. And then, a sliding mode surface in...
For a class of nonlinear continuous systems, this paper proposes a sliding mode control with unidirectional auxiliary surfaces (UAS-SMC) based on a double power reaching law and a disturbance observer (DO). Firstly, according to the nonlinear continuous systems, the switching surfaces and the controller based on the proposed law and DO are designed to weaken the chattering phenomenon caused by disturbance...
A novel disturbance rejection control scheme is proposed to address the robust attitude control problem for the air-breathing hypersonic vehicle (AHV) with mismatched disturbances. The attitude control system is decomposed into two subsystems, the outer-loop subsystem and inner-loop subsystem. The predictive sliding mode control (PSMC) is utilized to attenuate mismatched model uncertainties imposed...
A continuous stirred tank reactor (CSTR) is typical of equipment found in the process control industry. The dynamics represent a wide class of second order nonlinear systems and thus as well as having specific industrial application, control of the CSTR is frequently used as a benchmark problem for application and testing of new control algorithms. Due to the high complexity of the CSTR system, the...
This paper investigates a finite-time disturbance observer (FTDO) based nonsingular terminal sliding mode control (NTSMC) approach for DC-DC boost converter system. By using exact feedback linearization theory and control method to solve the output voltage regulation problem under the load resistance changes and external input voltage variations. Integrating the disturbance estimated by FTDO into...
This paper investigates the tracking control problems of a voice coil motor (VCM) actuated servo gantry system. A novel sliding mode disturbance observer based control algorithm is proposed to accommodate both model uncertainties and various disturbances. In the proposed control architecture, the sliding mode observer is introduced to estimate the total disturbances such that the observer error can...
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