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VLSI Test Symposium

作者： P. Nagvajara M.G. Karpovsky L.B. Levitin Department of Electrical and Computer Engineering Drexel University Philadelphia PA USA Research Laboratory for Design and Testing of Computer and Communication Systems Department of Electrical Computer and System Engineering Boston University Boston MA USA

An analysis and design of a pseudorandom pattern generator, (PRPG), based on a linear recurrence, for built-in self-test (BIST) boundary scan design is presented. The authors present for the case when r>or=s, a design of an s-stage PRPG capable of producing 2/sup s/-1 distinct r-bit patterns within 2/sup s/-1 clock pulses independent of the hardware realization of the PRPG. For the case when r >

关键词： Automatic testing Built-in self-test Circuit testing Clocks Test pattern generators Pulse generation Pattern analysis Laboratories System testing design engineering

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Operation of harmonic side-drive micromotors studied through gear ratio measurements

Operation of harmonic side-drive micromotors studied through...

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International Conference on Solid State Sensors and Actuators (TRANSDUCERS)

作者： M. Mehregany S.M. Phillips E.T. Hsu J.H. Lang Electronics Design Center Department of Electrical Engineering & Applied Physics Case Western Reserve University Cleveland OH USA Laboratory for Electromagnetic & Electronic Systems Department of Electrical Engineering & Computer Science Massachusetts Institute of Technology Cambridge MA USA

The detailed operation of variable capacitance harmonic (or wobble) side-drive micromotors was studied through gear ratio measurements. The gear ratio of the wobble micromotor is affected by wear in the bearing and by rotor slip. Rotor slip is a function of motive torque magnitude, excitation angle, and friction torques. The gear ratio of a wobble micromotor can be expressed as a constant term plus a term that accounts for rotor slip. The constant term is the nominal gear ratio which is equal to the bearing radius divided by the bearing clearance. The rotor slip term is directly proportional to the bushing friction torque and inversely proportional to the square of the excitation voltage. Micromotor operation in air as opposed to nitrogen demonstrates a significantly larger bushing friction torque.< >

关键词： Micromotors Gears Friction Insulators Rotors Contacts Electromagnetic measurements Torque Nitrogen Electric variables measurement

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MAGNETOHYDRODYNAMIC SUBMARINE PROPULSION systems

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NAVAL ENGINEERS JOURNAL 1991年第3期103卷 141-157页

作者： SWALLOM, DW SADOVNIK, I GIBBS, JS GUROL, H NGUYEN, LV VANDENBERGH, HH Daniel W. Swallomis the director of military power systems at Avco Research Laboratory Inc. a subsidiary of Textron Inc. in Everett Mass. Dr. Swallom received his B.S. M.S. and Ph.D. degrees in mechanical engineering from the University of Iowa Iowa City Iowa in 1969 1970 and 1972 respectively. He has authored numerous papers in the areas of power propulsion and plasma physics and currently is a member of the Aerospace Power Systems Technical Committee of the AIAA. Dr. Swallom has directed various programs for the development of advanced power generation systems lightweight power conditioning systems and advanced propulsion systems for marine applications. His previous experience includes work with Odin International Corporation Maxwell Laboratories Inc. Argonne National Laboratory and the Air Force Aero Propulsion Laboratory. Currently Dr. Swallom is directing the technical efforts to apply magnetohydrodynamic principles to a variety of propulsion and power applications for various marine vehicles and power system requirements respectively. Isaac Sadovnikis a principal research engineer in the Energy Technology Office at Avco Research Laboratory Inc. a subsidiary of Textron Inc. He received his B.S. in engineering (1974) B.S. in physics (1975) M.S. in aeronautics and astronautics (1976) and Ph.D. in physics of fluids (1981) at the Massachusetts Institute of Technology. Dr. Sadovnik has been involved in research work funded by DARPA concerning the use of magnetohydrodynamics for underwater propulsion. He has built theoretical models that predict the hydrodynamic behavior of seawater flow through magnetohydrodynamic ducts and their interaction with the rest of the vehicle (thrust and drag produced). In addition Dr. Sadovnik has been involved in research investigations geared toward the NASP program concerning the use of magnetohydrodynamic combustion-driven accelerator channels. Prior to joining Avco Dr. Sadovnik was a research assistant at MIT where he conducted experimental and

Magnetohydrodynamic propulsion systems for submarines offer several significant advantages over conventional propeller propulsion systems. These advantages include the potential for greater stealth characteristics, increased maneuverability, enhanced survivability, elimination of cavitation limits, greater payload capability, and the addition of a significant emergency propulsion system. These advantages can be obtained with a magnetohydrodynamic propulsion system that is neutrally bouyant and can operate with the existing submarine propulsion system power plant. A thorough investigation of magnetohydrodynamic propulsion systems for submarine applications has been completed. During the investigation, a number of geometric configurations were examined. Each of these configurations and mounting concepts was optimized for maximum performance for a generic attack class submarine. The optimization considered each thruster individually by determining the optimum operating characteristics for each one and accepting only those thrusters that result in a neutrally buoyant propulsion system. The results of this detailed optimization study show that the segmented, annular thruster is the concept with the highest performance levels and greatest efficiency and offers the greatest potential for a practical magnetohydrodynamic propulsion system for attack class submarines. The optimization study results were used to develop a specific point design for a segmented, annular magnetohydrodynamic thruster for an attack class submarine. The design point case has shown that this thruster may be able to provide the necessary thrust to propel an attack class submarine at the required velocity with the potential for a substantial acoustic signature reduction within the constraints of the existing submarine power plant and the maintenance of neutral buoyancy. This innovative magnetohydrodynamic propulsion system offers an approach for submarine propulsion that can be an important contributio

关键词： Ship Propulsion

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Control logic and latching to the Faraday Cup experiment on the wind laboratory

Control logic and latching to the Faraday Cup experiment on ...

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Midwest Symposium on Circuits and systems (MWSCAS)

作者： A. Mavretic A. Konstantinidis E. Gergin R. Zhou Microelectronics Research Laboratory Department of Electrical Computer and Systems Engineering Boston University Boston MA USA

A satellite-mounted instrument has been developed to measure the energy spectrum of the solar proton flux in the solar wind. The instrument consists of a sensor (Faraday Cup), an analog signal processing chain, a high-voltage modulator, and a digital section, which is described. The functions of the digital section are (a) to interface with the main processor, (b) to provide the logic signals to the analog circuitry, (c) to deliver the necessary bit pattern to the high-voltage modulator, (d) to provide the calibration mode signals when necessary, and (e) to synchronize the sequence of events at the beginning of every spacecraft rotation. As with all space projects, primary concerns beyond the logical functionality consisted of circuit power consumption, instrumental mass, radiation tolerance levels, stability with respect to temperature, and relative ease of component procurement. The NASA WIND spacecraft will carry the experiment and launch in December of 1992.< >

关键词： Logic Instruments Digital modulation Signal processing Circuits Space vehicles Energy measurement Protons Sensor phenomena and characterization Digital signal processing

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Identification of faulty processing elements by space-time compression of test responses

Identification of faulty processing elements by space-time c...

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IEEE International Test Conference

作者： M.G. Karpovsky L.B. Levitin F.S. Vainstein Research Laboratory of Design and Testing of Computer Hardware Department of Electrical Computer and Systems Engineering Boston University Boston MA USA

A novel approach to the identification of a faulty processing element, based on an analysis of the compressed response of the system, is proposed. The test response is compressed first in space and then in time, and a faulty processing element is identified by a hard-decision decoding of the corresponding space-time signature. The overhead analysis and the solution for the hardware minimization problem are presented for several important classes of systems. The proposed method results in considerable hardware savings.< >

关键词： Fault diagnosis System testing Hardware design engineering Decoding Laboratories systems engineering and theory Educational institutions Vectors System buses

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Near-Time-Optimal Control of a Robot Manipulator using new Approximation Techniques

Near-Time-Optimal Control of a Robot Manipulator using new A...

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American Control Conference (ACC)

作者： Greg Heinzinger Paul Jacobs John Canny Brad Paden Department of Electrical Engineering and Computer Science and The Electronics Research Laboratory University of California Berkeley CA USA Laboratoire d'Automatique et d'Analyse des Systems Toulouse France Department of Computer Science University of California Berkeley USA Department of Mechanical Engineering and Center for Robotic Systems in Microelectronics University of California Santa Barbara CA USA

We present a new approach for determining a time-optimal trajectory for a robot manipulator with actuator torque bounds. We find an approximation to a globally optimal trajectory which passes between two configurations will avoiding obstacles. Our algorithm accomplishes this by by dynamically generating and searching a finite graph. Our algorithm is guaranted to produce a trajectory that performs within a user-specified factor of a time-optimal safe trajectory.

关键词： Robot control Manipulators computer science Torque control Jacobian matrices Actuators Algorithm design and analysis Approximation algorithms Gravity Tellurium

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Time-optimal trajectories for a robot manipulator: a provably good approximation algorithm

Time-optimal trajectories for a robot manipulator: a provabl...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： G. Heinzinger P. Jacobs J. Canny B. Paden Department of Electrical Engineering and Computer Sciences and the Electronics Research Laboratory University of California Berkeley Berkeley CA USA Laboratoire d'Automatique et d'Analyse des Systemes Toulouse France Department of Computer Science University of California Berkeley CA USA Department of Mechanical Engineering and Center for Robotic Systems in Microelectronics University of California슠Santa Barbara Santa Barbara CA USA

An algorithm is presented for generating near-time-optimal trajectories for an open-kinematic-chain manipulator moving in a cluttered workspace. This is the first algorithm to guarantee bounds on the closeness of an approximation to a time-optimal trajectory. The running time and space required are polynomial in the desired accuracy of the approximation. The user may also specify tolerances by which the trajectories must clear obstacles in the workspace to allow modeling of control errors.< >

关键词： Robots Manipulators Approximation algorithms Optimized production technology Safety

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Board-level diagnosis by signature analysis

Board-level diagnosis by signature analysis

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IEEE International Test Conference

作者： M.G. Karpovsky P. Nagvajara Research Laboratory for Design and Testing of Computer and Communication Systems Computer and Communication Systems Computer and Communication Systems Department of Electrical Computer and System Engineering Boston University Boston MA USA

Board-level diagnostic techniques by signature analysis based on single-error-correcting Hamming codes over GF(2/sup M/) (where M is the number of outputs per chip) are presented. Two techniques are considered: the space-time compressor technique for the case when responses from N chips on the board are wired to the compressor; and the time compressor technique for the case when test responses from each chip are transferred to the compressor via system bus. Assuming a single-faulty-chip model, a faulty chip on the board under test is located by an analysis of the relationship between the distortions in the obtained signatures. Both techniques for board-level diagnosis require less hardware than the straightforward diagnostic techniques using a built-in signature analyzer for every chip or selective testing of each chip via the system bus, hence offering an efficient approach for a design of a built-in-self-test board for for manufacturing testing.< >

关键词： System testing System buses Hardware Built-in self-test Automatic testing Pattern analysis Fault diagnosis Laboratories design engineering systems engineering and theory

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Some Extensions of the Open-Loop Balanced Approach for Model Reduction

Some Extensions of the Open-Loop Balanced Approach for Model...

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American Control Conference (ACC)

作者： J.M. Santiago M. Jamshidi Air Force Academy Colorado Springs CO USA Laboratory for Computer-Aided Design of Systems and Networks Department of Electrical and Computer Engineering University of New Mexico Albuquerque NM USA Department of Electrical Engineering Air Force Institute of Technology USA

This paper provides some extensions of a powerful open-loop model reduction technique called balanced realization. Developed by Moore, this approach uses concepts of controllability and observability to determine a reduced-order model. Moore's work was developed for controllable, observable, and asymototically stable systems. This paper shows that balancing techniques can be easily extended to unstable systems. Furthermore, using another model reduction method, called chained aggregation, the balanced and chained aggregation methods can be easily combined for systems that are also unobservable and uncontrollable.

关键词： Reduced order systems Symmetric matrices Control systems Matrix decomposition Observability Controllability Force control Eigenvalues and eigenfunctions Laboratories design automation

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