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检索条件"任意字段=Conference on Advanced Telescope and Instrumentation Control Software"

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advanced control algorithms for A turbogas unit control system retrofit

Advanced control algorithms for A turbogas unit control syst...

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4th Annual Emerging Technologies conference, ISA EXPO 2004

作者： Parra, Marino Sanchez De Lara Jayme, Salvador Muñiz, Alfredo Hernandez Arellano, Jesús Marquez Fernandez, Luis J.Bahamaca Cuernavaca Morelos. 62490 Mexico Industria SIGRAMA S.A.de C.V Calle Fco. I. Madero 56 Nte Torreón Coahuila. 27000 Mexico

This paper describes the highlights of the control software implementation stage for a Turbogas Power Unit (TPU) retrofit project corresponding to digital control algorithms design and their implantation and testing in a programmable logic controller (PLC), prior to commissioning and startup. The control algorithms were designed for a Frame 5 combustion control system retrofit. The new digital control system scopes the Exhaust Gas Temperature control, Speed control, Load control, and Supervisory control. The regulation and protection functions were developed and implanted in a modern high performance PLC according to the state-of-the-art IEC 1131-3 programming standard. Simulation tests were carried out with a dynamic mathematical model of a TPU implanted in an industrial PC with hardware interfaces for input/output process signals. Afterwards the PLC based control system was commissioned and started up and real tests were made with the Turbogas Power Unit. Copyright 2004 by ISA - The instrumentation, Systems and Automation Society.

关键词： Digital control systems

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The fringe and flexure tracking system for LINC-NIRVANA: Basic design and principle of operation

The fringe and flexure tracking system for LINC-NIRVANA: Bas...

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conference on New Frontiers in Stellar Interferometry

作者： Straubmeier, C Bertram, T Eckart, A Wang, Y Zealouk, L Herbst, T Andersen, D Ragazzoni, R Weigelt, G Univ Cologne Inst Phys D-50937 Cologne Germany

ISBN: (纸本)0819454230

LINC-NIRVANA is the interferometric near-infrared imaging camera for the Large Binocular telescope (LBT). Operating at JHK bands LINC-NIRVANA will provide an unique and unprecedented combination of high angular resolution (similar to 9 milliarcseconds at 1.25 mum), wide field of view (similar to 100 arcseconds(2) at 1.25 mum), and large collecting area (similar to 100 m(2)). One of the major contributions of the I. Physikalische Institut of the University of Cologne to this project is the development of the Fringe and Flexure Tracking System (FFTS). In close cooperation with the Adaptive Optics systems of LINC-NIRVANA the FFTS is a fundamental component to ensure a complete and timestable wavefront correction at the position of the science detector in order to allow for long integration times at interferometric angular resolutions. Using a dedicated near-infrared detector array at a combined focus close to the science detector, the Fringe and Flexure Tracking System analyses the interferometric point spread function (PSF) of a suitably bright reference source at frame rates of several hundred Hertz up to 1 kHz. By fitting a parameterized theoretical model PSF to the preprocessed image-data the FFTS determines the amount of pistonic phase difference and the amount of an angular misalignment between the wavefronts of the two optical paths of LINC-NIRVANA. For every exposure the correcting parameters are derived in real-time and transmitted to the respective control electronics, or the Adaptive Optics systems of the single-eye telescopes, which will adjust their optical elements accordingly. In this paper we present the opto-mechanical hardware design, the principle of operation of the software control algorithms, and the results of first numerical simulations and laboratory experiments of the performance of this Fringe and Flexure Tracking System.

关键词： LBT instrumentation interferometry fringe tracking piston

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Characterization and evaluation of portable FT-NIR instrumentation for life science measurements

Characterization and evaluation of portable FT-NIR instrumen...

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ALT'03 International conference on advanced Laser Technologies: Biomedical Optics

作者： Kalamatianos, Dimitrios Houston, Ralph J. Edmunds, John M. Wellstead, Peter E. Liatsis, Panos Thorniley, Maureen S. Dewhurst, Richard J. Dept. of Electrical Engineering Univ. Manchester Inst. Sci./Technol. PO Box 88 Manchester M60 1QD United Kingdom ACI Project Manchester Technology Fund Ltd. Univ. Manchester Inst. Sci./Technol. PO Box 88 Manchester M60 1QD United Kingdom Dept. of Instrumentation Univ. Manchester Inst. Sci./Technol. PO Box 88 Manchester M60 1QD United Kingdom

The current demand for versatile medical diagnostics has created a significant increase in the development of NIR spectroscopic techniques due to the relative transparency of body fluids and soft tissue in this spectral region. Specifically the non-invasive determination of blood substrates is a desirable measurement as a guide to the pathological condition of the patient, since blood forms the primary metabolic transport system for the body. There are well-defined needs for real-time near-infrared (NIR) monitoring instruments for in vivo clinical applications. This paper describes a compact and rugged FT-NIR instrument that has the potential to meet this need. A rapid software development environment was used to implement the active alignment, control and self-calibration algorithms. The current prototype has a spectral range of 500-2300 nm and collects a spectrum in 200 ms. The instrument has been validated with band-pass filters and water spectra. Hemoglobin (Hb) solutions and erythrocyte suspensions have also been measured. The well known water absorbance features around 1400 nm and 1900 nm have been observed along with Hb features around 550 nm and we have verified the published blood spectra.

关键词： Interferometers

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advanced boiler/turbine control and its benchmarking in a coal-fired power plant

Advanced boiler/turbine control and its benchmarking in a co...

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14th Annual Joint ISA Power Industry Division and EPRI controls and instrumentation conference/47th Annual ISA Power Industry Symposium, Proceedings

作者： Bentsman, Joseph Zheng, Kai Taft, Cyrus W. Department of Mechanical and Industrial Engineering University of Illinois at Urbana-Champaign Urbana IL 61801 EPRI I and C Center 714 Swan Pond Road Harriman TN 37748

The performance of robust multi-input-multi-output (MIMO) controllers designed for the megawatt output/throttle pressure control in a boiler/turbine unit of a coal-fired power plant using the H∞ optimization is evaluated. First, a comparison of the performance of a standard H ∞ controller with that of the linear multi-loop PID-based controller exhibiting performance very close to that of the currently employed nonlinear PID-based controller is carried out using the linear plant model. This comparison shows that the H∞ controller provides significantly lower performance deterioration under typical variations in plant dynamics. However, when the H∞ controller is implemented on the plant simulator that incorporates the actuator (steam valve) nonlinearity, its performance is found to be characterized by the excessive quasi-steady-state oscillations of the plant output. To address this problem, a modification of the robust control law referred to as the setpoint conditioning is developed. Simulations demonstrate that the resulting conditioned H∞ controller displays performance and robustness significantly superior to that of the currently employed nonlinear PID-based controller. In order to benchmark the robust controllers against the PID-based ones on the actual plant, a novel state/output bumpless transfer technique is presented that permits smooth switching between the online and the offline controllers under the limited knowledge of the actual dynamics of the controllers implemented in software/hardware. Copyright 2004 by ISA - The instrumentation, Systems and Automation Society.

关键词： Power plants

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Hardware-software co-synthesis of bus architecture embedded devices

Hardware-software co-synthesis of bus architecture embedded ...

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Canadian conference on Electrical and Computer Engineering (CCECE)

作者： J. Levman G. Khan J. Alirezaie Department of Electrical and Computer Engineering Ryerson University Toronto ONT Canada

Embedded systems permeate our society. Current estimates indicate that over 90 percent of worldwide computers are embedded systems. Embedded devices are found in the home, in medical instrumentation, air traffic control systems and more. Due to rapid advances in available technologies, the embedded systems of the future need to be designed using advanced tools that can help produce devices that meet performance, reliability and cost requirements. Hardware-software co-synthesis is the automatic generation of an embedded system's architecture. In this paper, we present an approach to hardware-software co-synthesis targeting bus architecture embedded systems. This approach employs exhaustive searching coupled with heuristic techniques while targeting multiple processor bus architecture pipelined heterogeneous systems. A substantive case study is provided demonstrating the tool's ability to analyze a variety of design trade-offs.

关键词： Computer architecture Embedded system Iterative methods Partitioning algorithms Hardware Pipeline processing Mixed integer linear programming Iterative algorithms Jacobian matrices Java

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An artificial neural network architecture for application in general diagnostics

An artificial neural network architecture for application in...

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International Automatic Testing conference, AUTOTESTCON

作者： Mark Osborne Matt Cornish Chris Gorringe Racal Instruments Group Limited Wimborne UK

ISBN: (纸本)0780384490

The application of computing rapidly advanced the test field, particularly the development of automatic test equipment (ATE). Typically the application of computers has been focussed on the control of instrumentation, allowing a large number of complex tests to be performed, with relatively little human interaction. The main development in computing that has propagated to the test environment has been the increase in processing power, allowing a greater number of faster, more complex tests and diagnosis to be performed. One area of development, that has not been adopted so rapidly, is the application of Artificial Intelligence (Al). The foundations of modern artificial neural network (ANN) theory were developed half a century ago, and although the application of neural networks can be difficult, their use is becoming increasingly widespread. This paper discusses a methodology that will allow Al to be applied, in an ad hoc fashion, in to the contemporary test arena, eliminating the need to for a link between LRU design and ANN development.

关键词： Artificial neural networks Application software Computer applications Performance evaluation Computer architecture Automatic testing Automatic test equipment Automatic control Instruments Humans

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software design for a balloon-borne solar telescope

Software design for a balloon-borne solar telescope

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conference on Innovative telescopes and instrumentation for Solar Astrophysics

作者： Zhu, D Wang, JN Nanjing Univ Posts & Telecommun Nanjing Peoples R China

ISBN: (纸本)0819446327

This paper introduces our control software design for a tracing system of precise pointing on a balloon-borne telescope to observe the active details on the solar surface. The telescope is an equatorial one with 80 cm in diameter. Borne by balloon, it works at 30 km above the sea level so as to get rid of the image disturbance due to atmosphere. The system contains three parts: basket control, telescope control and tip-tilt control. For telescope control, the crude sensors for pointing detection are two rotating transformers, while the fine sensors two linear CCDs which produce the error signals of pointing. An inserted-type industry-control computer PC104 completes the position close-loop and then drives the servo amplifiers to carry out pointing, searching and tracing automatically. Due to the fact that the position control loop is closed with an improved digital PID algorithm, the adjustment of the telescope may respond rapidly, therefore the telescope can precisely follow the Sun on the balloon. Simulation test shows that the tracing accuracy may reach as high as 4" (RMS).

关键词： balloon-borne telescope control software pointing searching tracing,. position close-loop

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VLT telescope control software- status, development and lessons learned

VLT telescope control software- status, development and less...

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conference on Large Ground-based telescopes

作者： Wirenstrand, K European So Observ D-85748 Garching Germany

ISBN: (纸本)0819446165

The four 8m VLT telescopes on Paranal are now in full science operation, and they all deliver good results with very small technical downtimes. Of course, many factors are contributing to these results, and also the telescope control software has its share. It has demonstrated to be robust and reliable and also flexible and expandable. In the four years since First Light of the first VLT telescope, this software has been continuously maintained and developed, for improvements on the 8m telescopes but also for use on other telescopes. In addition to the 8m ones, another three telescopes, using applicable parts of the same software, are in operation on Paranal: the 350-mm seeing monitor and two 400-mm siderostats. And the process continues: in the beginning of 2003 the first of three 1.8m Auxiliary telescopes for the VLT Interferometer will be installed;the control software to 80% being the same as for the 8m telescopes, but with additional devices and control functionality. Another three ESO telescopes on La Silla are also using the same software, as well as two wide field telescopes for Paranal that are now in the design and manufacturing phase. In this development process, and in particular after first installation, we have learned lessons in many areas of software project work. System design and engineering, standardization, tools, testing: these are example areas where there is always room for improvement. Another lesson learned is the importance of the concept of Commissioning, i.e. the work to take the telescope from "integrated" to "working"! What the future of telescope control software will be, that we don't know, but we are working on it! And we try to keep an evolutionary approach, taking advantage of the lessons learned.

关键词： software real-time control testing integration commissioning

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telescope with wavelength-agile diffractive wavefront control

Telescope with wavelength-agile diffractive wavefront contro...

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conference on advanced Wavefront control: Methods Devices and Applications

作者： Gruneisen, MT DeSandre, LF Rotge, JR Dymale, RC Lubin, DL USAF Res Lab Directed Energy Directorate Kirtland AFB NM 87117 USA

ISBN: (纸本)0819450359

"Programmable diffractive optics utilizing a high-resolution liquid-crystal phase modulator is demonstrated as a technique for large-range, two-dimensional aberration control. A high-resolution phase modulator system introduces modulo-2pi phase compensation via discrete-step phase modulation and operates with 307,200 independently addressable elements, and total optical efficiencies of up to 93%. Near-diffraction-limited imaging and beam directing is demonstrated in a telescope system with large off-axis aberrations. Wavelength-agile and extended spectral bandwidth operation are also demonstrated."

关键词： adaptive optics liquid crystals programmable diffractive optics wide-dynamic-range wavefront control computer-generated holography non-mechanical beam steering diffractive optics

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Application of distributed control techniques to the adaptive secondary mirror of Cornell's Large Atacama telescope

Application of distributed control techniques to the adaptiv...

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conference on Adaptive Optical System Technologies II

作者： Kulkarni, J D'Andrea, R Brandl, B Cornell Univ Dept Theoret & Appl Mech Ithaca NY 14853 USA

ISBN: (纸本)0819446181

In this paper we apply, recently developed, distributed control techniques to the control of an adaptive secondary mirror. The control technique implemented uses the 12 induced norm as a performance criterion. A finite difference model for the mirror is developed using shift operators. We determine the necessary constants from the physical properties of the mirror, from the typical dimensions of such a system, and from our performance requirements for operating the telescope in the near and mid-infrared region. The closed loop system is simulated by modelling the deformable mirror in Abaqus, a commercial finite element software, and by implementing the controller in Matlab.

关键词： adaptive secondary distributed control H-infinity interconnected systems

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