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Proceedings of the Biannual World Automation Congress

作者： E.L. Branch M. Bikdash A. Homaifar Department of Electrical Engineering NASA-Autonomous Control Engineering Center North Carolina Agriculture and Technical State University Greensboro NC USA

Track-seeking for a magnetic hard drive is a time optimal control problem where the objective is to move the R/W head from the current track to a specified destination track in minimum time using a bounded control effort. One difficulty is due to the nonlinear saturation and hysterisis behavior of the voice coil actuator. Therefore a dual fuzzy logic controller (FLC) for track seeking and track following is designed and implemented. The controller uses position and velocity to decide on the commanded electrical current. Once the reading head gets within a small distance of the target track, a linear pole placement design is implemented. We compare the performance of this controller with a time-suboptimal design obtained for the linearized version of the dynamics.

关键词： Fuzzy control Hard disks Target tracking Saturation magnetization Optimal control Magnetic heads Coils Actuators Fuzzy logic Velocity control

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Robust congestion control in high speed communication networks: A model predictive control approach 15th

Robust congestion control in high speed communication networ...

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15th World Congress of the International Federation of Automatic control, 2002

作者： Wang, Hua O. Gu, Yongru Fang, Huajing Department of Electrical and Computer Engineering Duke University DurhamNC27708-0291 United States Center for Nonlinear and Complex Systems Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9783902661746

In this paper, the design of explicit rate-based congestion control in high speed communication networks is considered. At a bottleneck node, there are multiple best-effort sources competing with other high priority cross traffic sources. The goal of congestion control is to achieve high link utilization, low packet loss, low delay, and fairness among the best-effort sources. In this paper, the high priority traffic is described by an autoregressive integrated moving average (ARIMA) process. To deal with the propagation delays associated with the best-effort sources, model predictive control, particularly, generalized predictive control, techniques are proposed to solve the congestion problem here. It is demonstrated that the proposed controller performs well and is robust to delay uncertainties. In addition, in a multiple-nodes configuration, the controller provides max-min fairness. Copyright © 2002 IFAC.

关键词： controllers

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Critical cases of a CNC drive system - Fault diagnosis via a novel architecture

Critical cases of a CNC drive system - Fault diagnosis via a...

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Annual Meeting of the North-American-Fuzzy-Information-Processing-Society

作者： Chafi, MS Moavenian, M Department of Mechanical Engineering Ferdowsi University of Mashhad Iran Department of Electrical Engineering Ferdowsi University of Mashhad Iran PARS Oil and Gas Co. Sapahbod Gharani Av. P.O. Box 6957-15875 Tehran Iran Autonomous Control Engineering Center University of New Mexico Albuquerque NM United States

ISBN: (纸本)0780374614

The application of a novel fuzzy-Neural architecture to diagnose faults in critical cases of a CNC X-axis drive system is described. The proposed architecture utilizes the concepts of fuzzy clustering, fuzzy decision making and RBF neural networks to create a suitable model based Fault Detection and Isolation (FDI) structure. In the present application, it is emphasized the faults just due to the nonlinear components and the components that have more significant effect on overall accuracy of the drive system. On 100 tests on the system, Le. the appropriate model, the diagnostic system allocated the fault location and fault size 100 percent correctly.

关键词： fuzzy classifier systems RBF neural networks CNC X-axis drive system fault detection and isolation

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Adaptive actuator failure compensation designs for a linearized aircraft longitudinal model

Adaptive actuator failure compensation designs for a lineari...

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AIAA Guidance, Navigation, and control Conference and Exhibit 2002

作者： Chen, Shuhao Tao, Gang Josh, Suresh M. Department of Electrical and Computer Engineering University of Virginia Charlottesville VA 22903 United States NASA Langley Research Center Mail Stop 161 Hampton VA 23681 United States

ISBN: (纸本)9781624101083

Actuator failures with unknown failure time, pattern, and parameters, can cause serious performance degradation and possibly instability in aircraft flight control systems. Such failures can occur at unknown instants of time, in an unknown pattern (e.g., a control surface getting stuck at an unknown value). In this paper, several adaptive actuator failure compensation schemes are presented and applied to a linearized longitudinal dynamic model of a transport aircraft. The adaptive schemes include state feedback design for state tracking, state feedback design for output tracking, and output feedback design for output tracking. Several simulation results are presented to demonstrate the effectiveness of the adaptive actuator failure compensation designs. © 2002 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Flight control systems

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Space-based instrument control using internet technologies

Space-based instrument control using internet technologies

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20th AIAA International Communication Satellite Systems Conference and Exhibit, ICSSC 2002

作者： Knoblock, Eric J. Konangi, Vijay K. Seibert, Marc A. Bhasin, Kul B. Department of Electrical and Computer Engineering Cleveland State University Cleveland OH 44115 United States NASA Glenn Research Center 21000 Brookpark Road Cleveland OH 44135 United States

ISBN: (纸本)9781624101113

The design and development of a Local Area Network consisting of instruments and sensors for the emulation of a space-based system is presented. The instrument LAN and associated hardware and software can be used to emulate the onboard LAN of a typical space-based system such as a spacecraft or a Mars rover. In either case, the LAN, which consists of both fixed and mobile sensors, is designed using controller Area Network technology as the bus architecture. Using a standard Internet web browser, the state of the sensors on the LAN can be observed and actuators can be controlled over an IP-based network. Upon completion of a single-node instrument LAN, this research will be extended to emulate a cluster or formation of distributed spacecraft each with its own onboard instruments and sensors. This allows the evaluation of space-based systems that utilize commercially available hardware and software as well as standard Internet technologies. © 2002 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： control system synthesis

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An adaptive control scheme for output feedback nonlinear systems with actuator failures 15th

An adaptive control scheme for output feedback nonlinear sys...

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15th World Congress of the International Federation of Automatic control, 2002

作者： Tang, Xidong Tao, Gang Joshi, Suresh M. Department of Electrical and Computer Engineering University of Virginia CharlottesvilleVA22903 United States Mail Stop 161 NASA Langley Research Center HamptonVA2S681 United States

ISBN: (纸本)9783902661746

An adaptive control scheme to achieve stability and output tracking is presented for the output-feedback nonlinear plant with unknown actuator failures. A state observer is designed for estimating the unavailable plant states, based on a chosen control strategy, in the presence of actuator failures with unknown failure values, time instants and pattern. An adaptive controller is developed by employing the backstepping technique, for which parameter update laws are derived to ensure asymptotic output tracking and signal boundedness of the closed-loop system, as shown by detailed stability analysis. Copyright © 2002 IFAC.

关键词： Feedback

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Convexity in zero-sum differential games

Convexity in zero-sum differential games

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IEEE Conference on Decision and control

作者： R. Goebel Center for Control Engineering & Computation Department of Electrical & Computer Engineering University of California Santa Barbara CA USA

A new approach to two-player zero-sum differential games with convex-concave cost function is presented. It employs the tools of convex and variational analysis. A necessary and sufficient condition on controls to be an open-loop saddle point of the game is given. Explicit formulas for saddle controls are derived in terms of the subdifferential of the function conjugate to the cost. Existence of saddle controls is concluded under very general assumptions, not requiring the compactness of control sets. A Hamiltonian inclusion, new to the field of differential games, is shown to describe equilibrium trajectories of the game.

关键词： Cost function Open loop systems Sufficient conditions Differential equations control engineering control engineering computing Integral equations

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A vertically integrated approach to graduate control engineering education of ethnic minorities

A vertically integrated approach to graduate control enginee...

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Proceedings of the Biannual World Automation Congress

作者： M. Jamshidi Regents Professor of Electrical and Computer Engineering AT&T Professor of Manufacturing Engineering and Director of Autonomous Control Engineering (ACE) Center University of New Mexico Albuquerque NM USA

When representatives of high-technology corporations come to US University campuses to recruit science and engineering graduates, they will be hard pressed to find many ethnic minorities, women or people with disabilities. Is anybody surprised on this? The problem is a deep-rooted one indeed. Science, Mathematics and engineering education is among some of the shrinking majors for USA's graduating high school seniors. The problem is consistently and uniformly spread over the whole population of the United States (including the majority white population), and is even more pronounced among minority population. Some of our major corporations with a dominant role in the international market place are losing grounds to European and Asian competitors, in part, due to lack of vision to ensure for future supply of competent high-tech work force. Here by minority we mean African American, Native American (American Indians), Hispanic American, Alaskans and Pacific Islanders.

关键词： engineering education Educational institutions engineering profession computer aided manufacturing Mathematics Business Physics education control engineering Recruitment control engineering education

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Genetic algorithm based gain scheduling

Genetic algorithm based gain scheduling

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Congress on Evolutionary Computation

作者： B. Kimiaghalam A. Homaifar M. Bikdash B. Sayyarrodsari NASA-Autonomous Control Engineering Center Department of Electrical Engineering NC A&T State University Greensboro NC USA Research and Development Pavilion Technologies Inc. Austin TX USA

We designed a feedforward control law that greatly decreases the load sway of a shipboard crane due to ship rolling. This feedforward control uses measurements of ship rolling angle at each instant. At different operating points the optimal feedforward gain changes while is numerically computable. Here, we propose to use a genetic algorithm (GA) based approach to optimize the mapping of feedforward gain in four dimensional space. The process is based on the numerical calculation of the optimal feedforward gain for any rolling angle (/spl rho/), length of the rope (L), and luffing angle (/spl delta//sub 0/). The optimal gain is calculated for a group of points in the working space and then fit a function of order n to these points in a four dimensional space. Our choice for this problem includes real value GA with a combination of different crossover methods. The cost function is the sum of squared errors at selected points and we aim to minimize it. Since moving the load to another location also changes the optimal gain, the new improved gain scheduling further reduces the swinging within the whole working space. GA is a directed search method and is capable of searching for variables of functions with any desired structure. The major advantages of using GA for function mappings is that the function does not have to be linear or in any specific form.

关键词： Genetic algorithms Cranes Marine vehicles Open loop systems Frequency Motion control Fuzzy logic control engineering Research and development Cost function

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AN ADAPTIVE control SCHEME FOR OUTPUT FEEDBACK NONLINEAR SYSTEMS WITH ACTUATOR FAILURES

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IFAC Proceedings Volumes 2002年第1期35卷 415-420页

作者： Xidong Tang Gang Tao Suresh M. Joshi Department of Electrical and Computer Engineering University of Virginia Charlottesville VA 22903 Mail Stop 161 NASA Langley Research Center Hampton VA 23681

关键词： Actuators adaptive control backstepping failure compensation nonlinear systems tracking stability

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