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The adaptive sliding mode control for a class of time varying delay systems with mismatched uncertainties and matched external perturbations are investigated in this paper. Based on the Lyapunov theory, a sufficient condition derived in terms of LMI is given to guarantee the existence of the sliding surface. The adaptive control is used to overcome the unknown upper bound of perturbations. Furthermore,...
This paper investigates the control of pressure in a hydraulic circuit containing a dead band and a time varying delay. The dead band is considered as a linear term and a perturbation. A sliding mode controller is designed. Stability conditions are established by making use of Lyapunov-Krasovskii functionals, nonperfect time delay estimation is studied and a condition for the effect of uncertainties...
The robust precision dynamic control output of pneumatic systems requires model-based control techniques such as sliding mode and adaptive control. These controllers require full state knowledge of the system, viz. pressure, position, and velocity. For measuring two of the states, a pneumatic servo system requires two expensive pressure sensors per axis, and hence it makes the system economically...
In this paper, a partially known nonlinear dynamic system with input and state time-varying delay was approximated by N fuzzy-based linear subsystems described by state-space model with average-delay. For tracking the trajectory with a primary frequency, the fuzzy reference models with desired amplitude and phase features were established. Similarly, the same fuzzy sets of the system rule were employed...
This paper proposes a new type of a non-conventional electro-magnetic actuator (EMA) for a micro-positioner with larger moving range. It is a repulsive magnetic system consisting of a motion carrier and two active coils. The movement of the motion carrier is due to the repelling force between the coils and the magnets affixed to the carrier. First, the dynamic model is derived and analyzed. Next,...
One possible approach to control turbofan engines is the use of high pressure and low pressure compressor field parameters. The adaptation line represents the locus of intermediate steady states between initial and final states. This is modeled to generate the smooth time varying compressor rates, mass flow rate and rotation rates of high pressure and low pressure compressors. Outer loop controls...
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