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Controller Gains (controller + gain)

Distribution by Scientific Domains
Engineering75%

Selected Abstracts

A simple mechanism for stabilizing network queues in TCP/IP networks

INTERNATIONAL JOURNAL OF NETWORK MANAGEMENT, Issue 4 2007
James Aweya
In this paper we determine the stability bounds for the DRED active queue management (AQM) algorithm using a previously developed nonlinear dynamic model of TCP. We develop a second-order linear model with time delay by linearizing the nonlinear model. Using the Pade approximation of time-delayed system e,R0s, where R0 is the delay in the system, we then determine the range of stabilizing gains of DRED when controlling the second-order system with time delay R0. We also present examples showing the stability bounds of the DRED controller gain for networks with different parameters such as link capacity, load level, and round-trip time. In addition, we describe an efficient implementation of the DRED AQM algorithm. Copyright © 2006 John Wiley & Sons, Ltd. [source]

Self-tuning control of electrical machines using gradient descent optimization

OPTIMAL CONTROL APPLICATIONS AND METHODS, Issue 2 2007
Ziqian LiuArticle first published online: 28 DEC 200
Abstract This paper presents a new approach toward the design of a self-tuning proportional-integral (PI) control for induction motors. By using the method of gradient descent optimization to the parameter space, the controller gains developed in this study are adjusted automatically online. Therefore, the proposed PI control is robust to the changes of induction motor parameters and achieves the performance of global asymptotic speed tracking. Theoretical analysis and simulation results are presented to show the effectiveness of the approach. Copyright © 2006 John Wiley & Sons, Ltd. [source]

Observer-based controller design of discrete-time piecewise affine systems

ASIAN JOURNAL OF CONTROL, Issue 4 2010
Ya-Hui Gao
Abstract This paper presents a novel observer-based controller design method for discrete-time piecewise affine (PWA) systems. The basic idea is as follows: at first, a piecewise linear (without affine terms) state feedback controller and a PWA observer are designed separately, and then it is proved that the output feedback controller constructed by the resulting observer and state feedback controller gains can guarantee the stability of the closed-loop system. During the controller design, the piecewise-quadratic Lyapunov function technique is used. Moreover, the region information is taken into account to treat the affine terms, so the controller gains can be obtained by solving a set of linear matrix inequalities, which are numerically feasible with commercially available software. Three simulation examples are given finally to verify the proposed theoretical results. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society [source]