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Re-entry vehicles are space analogue of aircraft. It is the unanimous solution to achieve low cost, reliable and on-demand space access since they are used for multiple missions. Integrated adaptive guidance and control methodologies can be investigated to improve the safety and operability of these vehicles. In this paper, the state of the art adaptive control design called State Dependent Riccati...
This paper proposes a novel type of fast convergence robust controller for a non-laminated magnetic bearing system whose dynamics is governed by a non-commensurate fractional order model. The key feature of this approach is the use of Fractional Order PID sliding manifolds and the appropriate sliding mode control law developed to assure the robustness. The stability of the closed loop system is ensured...
This paper proposes an algorithm for periodic output feedback (POF) control for Delta operator systems. The Delta operator creates the rapprochement between analog and discrete dynamic system models and establishes the natural framework to investigate the behavior of discrete dynamic models with fast sampling rates. It is shown here that, the periodic output feedback control fails for discrete-time...
This paper proposes a novel control algorithm for linear discrete time uncertain input delay systems using infrequent output observations i.e, periodic output feedback technique. First, the uncertain delayed system, with a constant delay and bounded uncertainty is converted to an equivalent delay free system using a predictor. It has been shown that, when the output of the uncertain predicted system...
Gas metal arc welding (GMAW) is the most popular industrial welding process today, preferred for its versatility, speed and relative ease of adapting to robotic automation. This process has been used extensively by many industrial environments especially, the automobile industry. The advantages of automated welding process with feedback controllers include increased productivity, consistency in welding...
This paper proposes a new algorithm for achieving discrete-time sliding mode for linear multivariable nominal systems using output feedback. The concept of periodic output feedback is used here. It has been shown that, when the output of the system is sampled slower than the input, there exist a discrete-time sliding mode. The method is very general and is applicable to any controllable and observable...
This paper presents a new algorithm for discrete-time sliding mode control using output feedback. It has been shown that, when the output of the system is sampled slower than the input, a discrete-time sliding mode can be obtained. The method is very general and is applicable to any controllable and observable linear time-invariant single input single output system. The proposed technique is illustrated...
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