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In this paper a step by step adaptive super twisting controller is designed for second order nonlinear strict feedback system with mismatched uncertainty. The design procedure is carried out by considering a virtual controller at each step. After obtaining the first step the desired dynamic model for each state is defined by the previous one and finally the actual control law is obtained. The design...
The unknown inputs in a dynamical system may represent unknown external drivers, input uncertainty, state uncertainty, or instrument faults and thus unknown-input reconstruction has several wide-spread applications. In this paper we consider recursive reconstruction of unknown inputs with a delay for both square and non-square systems. That is, we develop filters that use current measurements to estimate...
This paper presents a decoupled sliding mode controller with fuzzy logic adaptive tuner for a class of under actuated systems with mismatched uncertainties. By using the concept of hierarchical decoupling method, the coupled nonlinear system can be decoupled into several subsystems. Each subsystem has a separate control target expressed in terms of a sliding surface. From sliding surface of subsystems,...
It has recently been demonstrated that the effect of visual measurement errors on the open-loop control in visual servoing can be estimated using linear propagation of errors. The uncertainty estimation offers a tool to build and analyze hybrid control systems such as switching or partitioning control. In earlier works, position-based and 2.5D servoing have been analysed. This work extends the approach...
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