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An Observer Design for Time-Delay Control and its Application to DC Servo Motor

An Observer Design for Time-Delay Control and its Applicatio...

引用

American Control conference (ACC)

作者： Pyung H. Chang Jeong W. Lee Department of Precision Engineering & Mechatronics Korea Advanced Institute of Science and Technology Daejeon South Korea

Recently the Time Delay Control (TDC) method has been proposed as a promising technique in the robust control area, where the plants have nonlinear dynamics with parameter variations and substantial disturbances are present. TDC method, however, requires the measurements of all the state variables, together with their derivatives. This requirement imposes a severe limitation on the applications to most real systems. In order to solve this measurement problem, we proposed an observer design method that can stably reconstruct the state variables and their derivatives. Then, for a simulation study, the controller/observer based on our design method has been applied to a nonlinear plant, the result of which confirmed that the controller/observer performs satisfactorily as predicted. Finally we made experimentations on a DC servo motor that is subject to substantial amount of inertia variations and external disturbances. The results showed that the controller/observer performs quite robustly under those variations and disturbances, and is much less sensitive to sensor noise than the controller using numerical differentiations.

关键词： Servomechanisms DC motors Servomotors Uncertainty Robust control Noise robustness Noise measurement sensor systems Design methodology Design engineering

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Analysis of sensor suites for a guided projectile 1

Analysis of sensor suites for a guided projectile

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1st IEEE conference on Control applications, CCA 1992

作者： Ems, Dale F. Honeywell Systems and Research Center United States

ISBN: (纸本)0780300475

This paper will discuss two candidate sensor suites for a guided projectile. The projectile employs a millimeter wave seeker for terminal guidance to a target. In addition, various complements of gyroscopes, accelerometers, and seeker gimbal potentiometers are employed to perform the target tracking, autopilot and guidance functions. Analyses of two sensor suites will be compared in this paper. The sensor suites are Conventional with 3 body rate gyros, 2 gimbal rate gyros, and 2 accelerometers (normal and lateral), and advanced with 3 body rate gyros, 2 gimbal angle potentiometers, and 2 accelerometers (normal and lateral). The analyses will address performance in terms of the target tracking error and impact miss distance. Covariance response to sensor biases and noises, as well as target motion, and wind gusts will be presented. In addition an analysis of robust performance will be conducted using the structured singular value. Robust performance has to do with how much the nominal performance deteriorates in the presence of modeling uncertainty. Model uncertainty due to inaccurately known aerodynamic characteristics and sensor transfer function errors will be addressed. © 1992 IEEE.

关键词： Target tracking

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Proceedings of the conference on Advances in Instrumentation and Control

Proceedings of the Conference on Advances in Instrumentation...

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Proceedings of the conference on Advances in Instrumentation and Control

ISBN: (纸本)1556173857

This conference proceedings contains 56 papers on advances in process control systems and instrumentation. Topics discussed include the benefits of integrated plant control, the impact of OSHA regulations on control and safety systems, instrumentation and control applications in oil and gas production, plant commissioning and startup, instrument installation design and constructability, open systems in process manufacturing, sensor technology and development, compliance of control systems with Good Manufacturing Practices, advanced power plant control systems and man/machine interfaces, neural network applications for power plant control systems, pulp and paper mill control systems, water and wastewater treatment plant control systems, instrumentation for cryogenic systems, advances in process analyzer technology, sampling for chemical analysis, monitoring toxic gaseous emissions for compliance with the Clean Air Act, colorimetric methods of process control, and novel analyzer systems for process monitoring.

关键词： Process control

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Fuzzy methods for classification in diagnostic systems

Fuzzy methods for classification in diagnostic systems

引用

First International conference on Fuzzy Theory and Technology Proceedings, Abstracts and Summaries

作者： Sturzenbecker, Martin C. Parisi, Debra M. IBM Manufacturing Research T. J. Watson Research Center Yorktown Heights NY 10598 United States Duke University Durham NC 27706 United States

Computer-assisted interpretation of sensor data in a modern diagnostic system brings together various technologies, including signal and image processing, pattern recognition, and artificial intelligence. In both biomedical and advanced manufacturing applications the complexity of the processes under investigation renders the task of automated classification difficult. A method for reasoning in the presence of uncertainty in essential to accomplishing this task effectively. Recently the theory of fuzzy sets and related uncertainty calculi have emerged as viable alternatives to traditional probabilistic approaches in some applications. This paper is a survey of methods employing some concept of fuzziness or degree of membership in the solution of pattern classification problems, and the potential role of these methods in diagnostic systems.

关键词： Pattern recognition systems

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Simulation of advance ignition system for a four stroke and single cylinder engine using photo sensor and 8751H microcontroller 1

Simulation of advance ignition system for a four stroke and ...

引用

1st IEEE conference on Control applications, CCA 1992

作者： Hwang, Santai Department of Electrical Engineering Technology Indiana-Purdue University at Fort Wayne Fort WayneIN46805 United States

ISBN: (纸本)0780300475

In this paper two engine subsystems, digital engine speed display and advance ignition system, are simulated and discussed to provide the understanding and insight necessities to design a microcontroller-based electronic control system for a four stroke and single cylinder engine.. A DC motor whose speed is adjusted by a voltage transformer and numerated by a photo sensor, microcontroller 8751H, and digital readout is used as an engine. A lookup table for the nonlinear relation between the engine speed and the advance ignition angle is stored in an EPROM. A timing light is used to identify the advanced ignition angles of spark plug. This simulation shows that some mechanical hardwares can be replaced by electronic components to make automobile engines more efficient and inexpensive. © 1992 IEEE.

关键词： Microcontrollers

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High-speed distributed digital instrumentation system

High-speed distributed digital instrumentation system

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28th International Telemetering conference - ITC/USA/92

作者： Donlan, Brian Baumgartner, Michael Science Applications Int Corp Panama City United States

ISBN: (纸本)1556173865

A distributed architecture for high-speed digital and analog instrumentation is discussed. This architecture supports the collection, formatting, recording of both conventional telemetry (analog & PCM) and high-speed digital data. Remotely located instrumentation data interface units provide data acquision close to the data sources. The remotely located units are connected via high-bandwidth fiber optic links to a central formatting and recording unit. Data is recorded on digital rotary head recorders. Graphic workstations provide visual data displays for test control and monitoring. This system was developed to handle the high-speed data acquision requirements of advanced avionics sensor and seeker systems, however, it provides the basis for many other applications.

关键词： Digital instruments

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Fiber-optic Rotation sensor for NASA space missions

Fiber-optic Rotation Sensor for NASA space missions

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Proceedings of the 15th Annual Rocky Mountain Guidance and Control conference

作者： Freier, L. Laznicka, O. Magee, R. Murphy, J. Bartman, R. Lehman, D. C.S. Draper Lab Cambridge United States

ISBN: (纸本)0877033544

Fiber-optic Rotation sensors (FORS) are all solid-state devices capable of measuring rotations and rotation rates in inertial space. They are intended to eventually serve as replacements for spinning mass systems and ring laser gyros in applications that place a premium on long lifetime, low-weight, low-power consumption and/or reduced costs. As such, they should prove particularly well-suited to space applications such as NASA's planetary programs. The Jet Propulsion Laboratory (JPL) and Draper Laboratory (Draper), under NASA sponsorship, are in the process of developing a FORS with the intent of using it on the Comet Rendezvous/Asteroid Flyby (CRAF) and the Saturn-orbiting Cassini missions. Brassboard FORS have demonstrated the performance levels required for precision pointing and control of spacecraft, platforms, telescopes and advanced transportation systems. Preliminary tests of FORS solid-state opto-electronic components indicate that they are capable of meeting the reliability characteristics required for space usage. This paper describes the mission, Inertial Reference Unit (IRU) requirements, FORS instrument, and opto-electronic components requirements. An overview of the design of the FORS, as well as the results of overall instrument performance tests will be presented.

关键词： sensors

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A real time controlled large-gap magnetic suspension using one-dimensional position measurement

A real time controlled large-gap magnetic suspension using o...

引用

IEEE Instrumentation and Measurement Technology conference

作者： C.E. Lin Y.-R. Sheu Institute of Aeronautics and Astronautics Cheng Kung University Tainan Taiwan

A contact image sensor is used as the position sensor for real-time control of a magnetic suspension system. The system contains a line light source and a linear photosensor array. The object to be measured is suspended between the light source and the sensor array. It acts as a mask to shade and shape of the light reaching the sensor array. No advanced optical system for light focusing and calibration is necessary. The mechanical adjustment of the measurement system is not critical, and the method is relatively economical. Results show that the sensor system is effective in real-time measurement systems for magnetic suspension control applications.< >

关键词： Magnetic levitation sensor arrays Magnetic sensors Optical arrays Image sensors sensor systems Real time systems Control systems Light sources Mechanical sensors

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Analysis of sensor suites for a guided projectile

Analysis of sensor suites for a guided projectile

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IEEE conference on Control Technology and applications (CCTA)

作者： D.F. Enns Honeywell Systems and Research Center Inc. USA

Two candidate sensor suites for a guided projectile are discussed. The projectile uses a millimeter-wave seeker for terminal guidance to a target. Various complements of gyroscopes, accelerometers, and seeker gimbal potentiometers are used to perform the target tracking, autopilot and guidance functions. The sensor suites are conventional, with three body-rate gyros, two gimbal-rate gyros, and two accelerometers (normal and lateral); and advanced, with three body-rate gyros, two gimbal-angle potentiometers, and two accelerometers (normal and lateral). The analysis addresses performance in terms of the target tracking error and impact miss distance. Covariance response to sensor biases and noises, as well as target motion and wind gusts, are presented. Robust performance, i.e., how much the nominal performance deteriorates in the presence of modeling uncertainty, is analyzed using the structured singular value. Model uncertainty due to inaccurately known aerodynamic characteristics and sensor transfer function errors is addressed.< >

关键词： Projectiles Accelerometers Potentiometers Target tracking Performance analysis sensor phenomena and characterization Uncertainty Gyroscopes Noise robustness Aerodynamics

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Process control integration requirements for advanced life support systems applicable to manned space missions

Process control integration requirements for advanced life s...

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21st International conference on Environmental systems

作者： Spurlock, Paul Spurlock, Jack M. Evanich, Peggy L. SandA Automated Systems Boca Raton FL United States NASA Headquarters Washington DC United States

applications of life support systems for space missions to date have been limited to the use of relatively simple processes and, consequently, there has been minimal utilization of process control within those systems. Furthermore, the maturation of the sensor technology required for these applications has not tracked that of other system components. Future integrated life support systems for long duration missions should be expected to have a substantially higher level of complexity, with operational demands similar to those of advanced chemical plants and attendant requirements for sophisticated process-control and sensor technologies to achieve safety and reliability objectives. Early integration of state-of-the-art control systems and related components into the methodology is necessary for optimum interfacing effectiveness during design and development of these new systems, and to ensure parallel growth during operational life cycles. This paper provides an overview of recent developments in process-control technology which might have applications in future advanced life support systems for long duration space operations and describes some of the design criteria that should be considered. These criteria relate to control system selection and optimization, and process-control interfacing methodology. © Copyright 1991 Society of Automotive Engineers, Inc.

关键词： Process control

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