Optimal and robust control theories are used to determine effective, estimator-based feedback control rules for laminar plane channel flows that effectively stabilize linearly unstable flow perturbations at Re = 10 000 and linearly stable flow perturbations, characterized by mechanisms for very large disturbance amplification, at Re = 5000. Wall transpiration (unsteady blowing/suction) with zer...

A novel control scheme for the active steering of railway vehicles is presented in the paper using disturbance observer based control (DOBC) techniques. In contrast to existing DOBC schemes which are mainly for singleinput-single-output (SISO) systems and designed by trial and error, a new DOBC technique for multi-input-multi-output (MIMO) systems is developed. This is achieved by reforming the...

Topics covered: 1. Landscape dynamics concepts – stability, persistence, resistance, resilience and recovery 2. Landscape equilibrium concepts – absolute constancy, shifting mosaic-steady state, stationary processes, bounded equilibrium 3. Nonequilibrium landscapes – role of legacies, landscape uniqueness, importance of scale 4. Disturbance and landscape equilibrium – scaling of disturbance reg...

In this paper, control of uncertain fractional-order financial chaotic system with input saturation and external disturbance is investigated. The unknown part of the input saturation as well as the system's unknown nonlinear function is approximated by a fuzzy logic system. To handle the fuzzy approximation error and the estimation error of the unknown upper bound of the external disturbance, f...

This paper presents a novel chassis structure for advanced mobility platforms, using caster wheels with disturbance observers, and independent driving motors. The system consists of two independent driving wheels and two caster wheels. The proposed configuration enables the vehicle to have: a low mechanical stiffness against the direct yaw moment input because caster wheels are free to rotate; ...

The successful ability to conduct underwater transportation using multiple autonomous vehicles (AUVs) is important for the commercial sector undertake precise installations on large modules, whilst military it has added advantage of improved secrecy clandestine operations. technical requirements are stability payload and internal collision avoidance while keeping track desired trajectory consid...

This paper relates generally to sliding mode control (SMC) system based on uncertainty and disturbance estimation (UDE) and more particularly to a system, with the presence of high frequency measurement noise and unmodeled dynamics. Higher order dynamics are difficult to identify and remain excluded from theoretical model of the system, generally the main cause of instability. The presence of u...

Aimed at the problems of low control accuracy and weak robustness influenced by external disturbance, friction, load changes, modeling errors and other issues in ammunition auto-loading robot control system, a new robust adaptive fuzzy sliding mode controller based on fuzzy compensation is proposed. The control architecture employs fuzzy systems to compensate adaptively for plant uncertainties ...

In this paper, we propose a new adaptive control system design using internal model principle (IMP) for a bounded polynomial parameters. In this method, we regard time varying parameters as variable disturbance and design an estimating law used the internal model of the disturbance so that the law is able to rejected the effectness of the disturbance. Our method has the features that the tracki...

Increased recognition of the global importance of salt marshes as 'blue carbon' (C) sinks has led to concern that salt marshes could release large amounts of stored C into the atmosphere (as CO2) if they continue undergoing disturbance, thereby accelerating climate change. Empirical evidence of C release following salt marsh habitat loss due to disturbance is rare, yet such information is essen...