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This paper presents the experimental implementation of the multi-variable resonant control scheme with an integral action to compensate the vibration and the cross coupling effect between the axes of the piezoelectric tube scanner (PTS) in an atomic force microscope (AFM) for fast image scanning. The aim of the current work is to improve the high speed imaging performance of the AFM through multi-variable...
This paper considers the use of singular perturbation approximations for general linear quantum systems where the system dynamics are described in terms of both annihilation and creation operators. Results that are related to the physical realizability property of the approximate system are presented.
Recently Schmid and Ntogramatzidis [1]–[2] gave a design method for linear time invariant state feedback controller to avoid overshoot and undershoot in the step response for multivariable systems. In this paper we describe a new public-domain MATLAB® toolbox to implement this control scheme.
In this paper the design and experimental implementation of an observer based model predictive control (OMPC) scheme for accurate tracking and fast scanning of an atomic force microscope (AFM) is presented. The design of this controller is based on an identified model of the AFM piezoelectric tube (PZT) scanner. A Kalman filter is used to obtain full-state information in the presence of position sensor...
In this paper we describe a novel direct optimization method using Gegenbauer-Gauss (GG) collocation for solving continuous-time optimal control (OC) problems (CTOCPs) with nonlinear dynamics, state and control constraints. The time domain is mapped onto the interval [0; 1], and the dynamical system formulated as a system of ordinary differential equations is transformed into its integral formulation...
In this paper, an adaptive control system by using adaptation and robustness characteristics of Gamma neural networks for a nonlinear and unstable system will be proposed. The system which has been chosen to show the application of a Gamma neural network is an Inverted Pendulum which is a famous system for designing a controller with nonlinear and unstable properties. Step by step stages to design...
In this paper, the physical realizability condition for a specific class of nonlinear quantum systems is related to the lossless property of nonlinear dissipative systems having a specific storage function.
The paper develops a method for improving the transient performance of feedback-controlled irrigation channels by varying the water-level references across time. To this end, a reference manager based on a model predictive control scheme is used to set the references at regular update times. The approach ensures satisfaction of actuator and water-level constraints for a season given full knowledge...
This paper introduces a novel methodology for designing efficient and strategy-proof direct mechanisms for a class of problems, where the user types are represented by smooth, concave, and increasing utility functions. Such mechanisms facilitate distributed control and allocation of resources. Hence, they are applicable to diverse problems ranging from those in communication networks to energy management...
This paper presents a suboptimal control technique based on the approximate constrained inverse of the Hessian matrix. The Hessian matrix is split into its diagonal part (the decoupled problem with a trivial inverse) and the off-diagonal part (the coupled component). Instead of the exact inversion of the Hessian matrix and solution of the Quadratic Programming (QP), an iterative approximate constrained...
Although there are many methods for the calculation of all stabilizing PID controllers for a given linear time invariant system, this problem is still time-consuming. Moreover, if there is a time delay or uncertainty in the system, the problem gets more complex. The power of computer algebra tools can be utilized in finding all stabilizing PID controllers more quickly. In this paper, a toolbox written...
This paper proposes a data-driven controller parameter tuning approach to the modified internal model control (IMC), which was proposed by Yamada in [9], for unstable plants. Here we clarify how to use fictitious reference iterative tuning (FRIT) to tune parameters of the modified IMC controller with only one-shot experimental data. The approach in this paper simultaneously yields a desired controller...
This paper proposes a scheme for improving the mixing in the boundary layer of pressure-driven membrane systems such as reverse osmosis and ultrafiltration. Through application of an external electric field, a flow of ions in the vicinity of the membrane surface will be generated, creating simultaneous electro-osmotic flow that should reduce the concentration polarization on the membrane surface....
I would like to invite all of the participants in the Second Australian Control Conference to take part in the Third Australian Control Conference (AUCC 2013) to be held in Perth in 2013. The conference will be held on the campus of the University of Western Australia (UWA) from 4-5 November 2012. The UWA is situated on the northern banks of the beautiful Swan River and is only a short drive to Perth...
This paper presents a PID tuning rule based on easily obtainable process data, for second order under-damped systems with time delays (SOPDT). The aim of the PID tuning rule is to give the exact settings in order to obtain the fastest response from the closed loop system without overshoot. Contrary to other well known tuning rules, the proposed tuning rule is obtained using direct digital control...
Multi-loop integral control is still one of the most popular control strategies in industry due to its simplicity, efficiency, offset free tracking, and capability for fault tolerance. Skogestad and Morari introduced Decentralized Integral Controllability (DIC) to investigate the decentralized unconditional stability under multi-loop integral control for square systems. However, in engineering practice,...
This paper presents a new definition of negative imaginary (NI) systems to include poles at the origin. Also, a necessary and sufficient stability conditions of positive feedback interconnection of NI systems that have poles at the origin with a strictly NI system is provided. As an application of this class of systems, an example of a train system is presented.
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