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American Control Conference (ACC)

作者： J. J. Bongiorno Department of Electrical Engineering and Computer Science Polytechnic Institute of New york University Farmingdale NY USA

A methodology for designing two-degree-of-freedom multivariable feedback control systems is described. A quadratic cost functional is used to measure such performance attributes as tracking error, saturation, and sensitivity to small plant perturbations. Stability margin is measured with and L ∞ -norm on an appropriately chosen stability margin matrix and a mechanism for tradeoff between performance and stability margin is outlined.

关键词： Feedback control Cost function Design methodology computer errors Linear feedback control systems Control systems Signal to noise ratio Stability criteria Noise measurement Equations

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PROGRESSING AND OSCILLATORY WAVES FOR HYBRID SYNTHESIS OF SOURCE-EXCITED PROPAGATION AND DIFFRACTION

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JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME 1985年第1期52卷 27-32页

作者： FELSEN, LB L. B. Felsen Department of Electrical Engineering and Computer Science/Microwave Research Institute Polytechnic Institute of New York Route 110 Farmingdale N.Y. 11735

Time-harmonic and transient propagation and diffraction phenomena can be described alternatively by progressing and oscillatory waves that express the wave motion in terms of direct and multiple wavefronts or rays, and in terms of resonances or modes, respectively. Each description is convenient and physically appealing when it requires few contributing elements. It is inconvenient and physically less transparent when it requires many elements, and it would then be desirable to combine many inconvenient elements into fewer convenient ones. For a variety of propagation environments, including layered or other guiding regions, this can be done by expressing a group of rays collectively in terms of modes, or a group of modes collectively in terms of rays. When this ray-mode equivalence is invoked selectively, there emerges a hybrid representation that combines ray fields and modal fields in uniquely defined proportions. The theory is based on Poisson summation and on alternative treatments of wave spectra. It has been applied to electromagnetics, underwater acoustics, and SH elastic motion, and is now being extended to general propagation in elastic media.

关键词： Diffraction Waves Electromagnetic force Transparency Motion Underwater acoustics Spectra (Spectroscopy) Wave motion

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Recent Advances in the L-A-S Software used in CAD of Control Systems

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IFAC Proceedings Volumes 1985年第8期18卷 145-150页

作者： S.P. Bingulac P.J. West W.R. Perkins Electrical Engineering Department Virginia Polytechnic Institute and State University Blacksburg VA 24061 USA Coordinated Science Laboratory and Department of Electrical and Computer Engineering University of Illinois Urbana IL 61801 USA

This paper reviews the basic features of a high-level, interactive, conversational language called L-A-S (Linear AIgebra and Systems). Particular emphasis is placed upon recent developments of this computer-Aided Design (CAD) language. Unlike the conventional menu-driven approach of many CAD packages, L -A -S provides the user with considerable flexibility in the development and maintenance of linear algebra and control algorithms. L-A-S is both a language and an interpreter. Users or L-A-S write programes while interacting with the Interpreter. Programs may he edited, stored, recalled, and executed with the same or a differernt data set. L-A-S data strunures include matrices, polynomials (continuos or discrete). and matrices of polynomials. In this paper. we briefly review the basics or the L-A-S language. Then. we concentrate on those features of L-A-S which have been added within the last year. These include the Multiple Operator Statement (MOS), L-A-S lNT-delined suhroutines. and the most-reccnt “echo” feature for interaction with the interpreter. Example, accompany the text to illustrate each new feature.

关键词： computer-aided Design Programming Languages Control engineering computer Applications Control System Analysis/Synthesis

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SYSTEM-75 - GAMUT - A MESSAGE UTILITY SYSTEM FOR AUTOMATIC TESTING

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AT&T TECHNICAL JOURNAL 1985年第1期64卷 305-320页

作者： LAKE, CJ SHANLEY, JJ SILVERSTEIN, SM Authors are employees of AT&T Information Systems Laboratories an entity of AT&T Information Systems Inc. Carole J. Lake: B.A. (Mathematics) 1968 Gettysburg College M.S. (Numerical Science) The Evening College of The Johns Hopkins University 1970 National Security Agency 1968–1974 Bell Laboratories 1979–1982 AT&T Information Systems Laboratories 1983—. James J. Shanley: B.E.E. 1961 Polytechnic Institute of New York M.E.E. 1963 New York University Bell Laboratories 1955–1982 Steven M. Silverstein: B.S. (Electrical Engineering) 1973 M.S. (Electrical Engineering/Computer Science) 1974 Polytechnic Institute of Brooklyn Bell Laboratories 1973–1982

GAMUT is an automated testing tool that can verify message activity in message-based systems. This tool is unique because it can be customized for application to a variety of systems and used in all test phases of a development cycle. Using a single interface, rather than an array of port-specific interfaces, GAMUT can generate and verify load traffic through scripts, as well as provide an automatic record and playback mechanism for feature testing. This paper discusses the design philosophy and distinctive features of GAMUT as well as its architecture. It illustrates message definition and the script command language by building a sample test script of a station-to-station call on the System 75 office communications system and concludes with a discussion of challenges and problems encountered while using the tool to test System 75.

关键词： DIGITAL COMMUNICATION SYSTEMS

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Suppression of Narrow-Band Interference in a Direct Sequence Spread Spectrum Receiver in the Absence of Carrier Synchronization

Suppression of Narrow-Band Interference in a Direct Sequence...

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MILCOM, Military Communications Conference

作者： Gary J. Saulnier Pankaj Das Laurence B. Milstein Corporate Research and Development General Electric Company Limited Schenectady NY USA Electrical Computer and System Engineering Department Rensselaer Polytechnic Institute Troy NY USA Department of Electrical Engineering and Computer Science University of California San Diego CA USA

Experimental and analytical results have shown that least-mean-squared (LMS) adaptive filtering greatly improves the performance of direct sequence spread spectrum receivers in the presence of narrow-band jammers [1,2,3]. Since the adaptive jammer suppression is, at times, performed at baseband, previous investigations have assumed that both carrier and chip synchronization have been achieved prior to the suppression of the jammer. However, the presence of the jammer can hinder both the acquisition and the maintenance of this synchronization. This paper discusses an LMS-based jammer suppression structure which does not require carrier synchronization. Monte Carlo simulation results are presented which show bit-error-rate (BER) performance for a receiver equipped with such a jammer suppressor.

关键词： Narrowband Interference suppression Spread spectrum communication Jamming Frequency synchronization Adaptive filters Baseband Signal processing Bit error rate Least squares approximation

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Thermal filamentation instability of millimeter waves in laboratory plasmas

Thermal filamentation instability of millimeter waves in lab...

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International Conference on Infrared and Millimeter Waves

作者： M. C. Lee J. A. Kong S. P. Kuo Research Laboratory of Electronics and Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge Massachusetts 02139 U.S.A. Polytechnic Institute of New York Long Island Center Farmingdale New York 11735 U.S.A.

During the electron cyclotron resonant heating of laboratory plasmas by intense millimeter waves, the thermal filamentation instability can be excited to cause significant fluctuations in plasma density and magnetic f... 详细信息

ISBN: (纸本)9781538608722

关键词： Cyclotrons Fluctuations Plasma density Heating systems Millimeter wave technology Magnetic fields

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SYSTEM-75 - SOFTWARE-DEVELOPMENT TOOLS

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AT&T TECHNICAL JOURNAL 1985年第1期64卷 287-304页

作者： PEDERSEN, TJ RITACCO, JE SANTILLO, JA Authors are employees of AT&T Information Systems Laboratories an entity of AT&T Information Systems Inc. Thomas J. Pedersen: B.S. (Electrical Engineering) 1960 Iowa State University M.E.E. 1962 New York University Bell Laboratories 1960–1982 AT&T Information Systems Laboratories 1983—. Joseph E. Ritacco: B.S. (Mathematics) 1965 Polytechnic Institute of Brooklyn M.S. (Mathematics) 1966 University of Michigan Bell Laboratories 1965–1977 1979–1982 American Bell International Inc. 1977–1979 Jamie A. Santillo: S.B. (Mathematics) 1975 The Massachusetts Institute of Technology M.S. (Information and Computer Science) 1976 Georgia Institute of Technology IBM Poughkeepsie 1976–1978 Bell Laboratories 1978–1982

Efficient development of high-quality software requires a comprehensive set of software development tools. Tools used within the System 75 office communication system project support a hierarchical model of development, and range from compilers, assemblers, and debuggers to high-level tools that drive the software manufacturing process and aid in monitoring software quality and performance. Tools are applied in each of the many steps required to develop, test, integrate, and maintain product releases. Staff roles and procedures for use of these tools encompass a set of development and release-management cycles that begin with the individual developer and extend into the field support organization. The roles and procedures are flexible and easily customized to support various individual and group assignments. Specific tools to be described include the Object Generation System, the Local Administrative Tool Kit; the Oryx/Pecos Test, Inquiry, and Control System; tools for testing processes in isolation; manufacturing and distribution tools; performance-measurement tools; source-control and change-management tools; and tools for program update and system analysis at field sites.

关键词： DIGITAL COMMUNICATION SYSTEMS

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AUTOMATION OF PROPELLER INSPECTION AND FINISHING

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NAVAL ENGINEERS JOURNAL 1985年第4期97卷 124-131页

作者： STERN, H METZGER, R Howard K. Stern:is presently vice president of Robotic Vision Systems Inc. He received a bachelor of electrical engineering degree from College of the City of New York in 1960. Mr. Stern joined Dynell Electronics Corporation in 1971 and became part of the Robotic Vision Systems Inc. staff at the time of its spin-off from Dynell. He was program manager of the various three-dimensional sensing and replication systems constructed by Dynell and Robotic Vision Systems. As program manager his responsibilities encompassed technical administrative and operational areas. The first two portrait sculpture studio systems and the first three replication systems built by Robotic Vision Systems Inc. were designed manufactured and operated under his direction. Before joining Dynell Mr. Stern was a senior engineer at Instrument Systems Corporation and chief engineer of the Special Products Division of General Instrument Corporation. Prior to these positions Mr. Stern was chief engineer of Edo Commercial Corporation. At General Instrument and Edo Commercial he was responsible for the design and manufacture of military and commercial avionics equipment. Mr. Stern is presently responsible for directing the systems design and development for all of the company's programs. Robert J. Metzger:is currently engineering group leader at Robotic Vision Systems Inc. He graduated summa cum laude from the Cooper Union in 1972 with a bachelor of electrical engineering degree. Under sponsorship of a National Science Foundation graduate fellowship he graduated from the Massachusetts Institute of Technology in 1974 with the degrees of electrical engineer and master of science (electrical engineering). In 1979 Mr. Metzger graduated from Polytechnic Institute of New York with the degree of master of science (computer science). Since 1974 Mr. Metzger has been actively engaged in the design of systems and software for noncontact threedimensional optical measurement for both military and commercial applications. Of particular note are his c

Ship's propellers are currently measured by manual procedures using pitchometers, templates and gauges. This measurement process is extremely tedious, labor intensive and time consuming. In an effort to provide increased accuracy, repeatability and cost effectiveness in propeller manufacture, an automated propeller optical measurement system (APOMS) has been built which rapidly and automatically scans an entire ship's propeller using a 3-D vision sensor. This equipment is integrated with a propeller robotic automated templating system (PRATS) and the propeller optical finishing system (PROFS) which robotically template and grind the propeller to its final shape, using the APOMS-derived data for control feedback. The optical scanning and the final shape are both controlled by CAD/CAM data files describing the desired propeller shape. An automated propeller balancing system is incorporated into the PROFS equipment. The APOMS/PRATS/PROFS equipment is expected to provide lower propeller manufacturing costs.

关键词： PROPELLERS

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EIGENREVERBERATIONS, EIGENMODES AND HYBRID COMBINATIONS - A NEW APPROACH TO PROPAGATION IN LAYERED MULTIWAVE MEDIA

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WAVE MOTION 1984年第5期6卷 435-457页

作者： LU, IT FELSEN, LB KAMEL, AH Department of Electrical Engineering and Computer Science Polytechnic Institute of New York Brooklyn NY 11201 USA

Coupling of wave species at interfaces and boundaries in a medium composed of plane multiwave layers creates a proliferation of ray fields even after relatively few multiple reflections. This inhibits a ray treatment of propagation from source to observer. The difficulty may be overcome by diagonalizing, in a plane wave spectral representation of the Green's function, the reverberation matrix F descriptive of the boundary coupling. The resulting eigenvectors of F represent combinations of the original Q wave species, to be referred to as eigenrays, which, except for multiplication by the eigenvalue λ q , q = 1 … Q , remain unaltered after one complete reverberation. Thus, eigenrays may be traced through successive reverberations like ordinary rays in a single-wave medium. This feature also permits the original multiwave Q × Q matrix problem to be decoupled into a sequence of scalar problems. Conventional eigenmodes are generated from eigenrays by imposing self-consistency ( λ q = 1) after one reverberation. Alternative representations for the multiwave Green's function by use of these new concepts include plane wave spectral integrals, normal and leaky modes, ray expansions, and hybrid ray-mode expansions. The latter are based on the formulation of an eigenray-eigenmode equivalent. After comparing the new representation with the conventional one, P-SV coupling in an elastic three-layer medium is treated as a special example.

关键词： WAVES

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ON NOISELESS SOURCE-CODING WITH SPECIFIED ENCODER OUTPUT SYMBOL FREQUENCIES

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IEEE TRANSACTIONS ON INFORMATION THEORY 1984年第5期30卷 752-754页

作者： SEN, P Department of Electrical Engineering and Computer Science Polytechnic Institute of New york University NY USA

A method is presented for generating prefix-condition codes in which the relative frequencies of the encoder output symbols are close to a previously specified probability distribution. A Kraft-like inequality is deve... 详细信息

关键词： CODES, SYMBOLIC

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