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2002 IEEE Aerospace conference

作者： Dousis, Dimitri A. O'Donnell, Bruce Bell Helicopter Textron Inc. P.O. Box 482 Fort Worth TX 76101 United States NAVNK Project Diagnostics NAWC Pattivent River MD 20670 United States

ISBN: (纸本)078037231X

This paper addresses the development and current status of the drive train vibration monitoring system (vMS) for v-22 tiltrotor aircraft, which monitors vibrations in the rotors, engines, interconnect shafting system (ISS), pylon shafts, and nacelle blowers, and includes the ISS hanger bearing temperature monitoring and the distinct function of rotor track and balance. The vMS design is based on the v-22 maintenance goals: to detect existing and/or developing faults to support the on-condition maintenance of mechanical components and to enhance preventive maintenance. This paper also covers the dynamic component monitoring (DCM) algorithms that have been incorporated in the Aircraft Maintenance Event Ground Station (AMEGS). Lessons learned and recent developments associated with the interface of the Integrated Electronic Technical Manual (IETM), including the approach for quick implementation of new maintenance procedures, are presented. The Bell-Boeing/NAvAIR Integrated Product Team provided a smooth transition from engineering design to field implementation. © 2002 IEEE.

关键词： Preventive maintenance

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Advances in design and implementation of optimization software

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EUROPEAN JOURNAL OF OPERATIONAL RESEARCH 2002年第2期140卷 322-337页

作者： Maros, I Khaliq, MH Univ London Imperial Coll Sci Technol & Med Dept Comp London SW7 2BZ England

Developing optimization software that is capable of solving large and complex real-life problems is a huge effort. It is based on a deep knowledge of four areas: theory of optimization Algorithms, relevant results of computer science, principles of software engineering. and the state-of-the-art in computer technology. The paper highlights the diverse requirements of optimization software and discusses the ingredients needed to fulfil those requirements. In addition to reviewing the current hardware/software environment it hints at how recent hardware developments can influence future optimization software. After a survey of computationally successful techniques for continuous optimization, it also outlines the perspective offered by parallel computing, and stresses the importance of optimization modeling systems. Being a survey paper. it includes many references to both give due credit to results in the field of optimization software, and to help readers obtain more detailed information on issues of interest. (C) 2002 Elsevier Science B.v. All rights reserved.

关键词： large scale optimization optimization software implementation technology

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Advances in design and implementation of optimization software

Advances in design and implementation of optimization softwa...

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EURO 2000 conference

作者： Maros, I Khaliq, MH Univ London Imperial Coll Sci Technol & Med Dept Comp London SW7 2BZ England

关键词： large scale optimization optimization software implementation technology

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developments of CCDs and relevant electronics for the X-ray CCD camera of the MAXI experiment onboard the International Space Station

Developments of CCDs and relevant electronics for the X-ray ...

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conference on X-Ray and Gamma-Ray Instrumentation for Astronomy XII

作者： Miyata, E Natsukari, C Kamazuka, T Kouno, H Tsunemi, H Matsuoka, M Tomida, H Ueno, S Hamaguchi, K Tanaka, I Osaka Univ Grad Sch Sci Dept Earth & Space Sci Osaka 5600043 Japan

ISBN: (纸本)0819442119

MAXI, Monitor of All-sky X-ray Image, is an X-ray observatory on the Japanese Experimental Module (JEM) Exposed Facility (EF) on the International Space Station (ISS). MAXI is a slit scanning camera which consists of two kinds of X-ray detectors: one is a one-dimensional position-sensitive proportional counter with a total area of similar to 5000 cm(2), the Gas Slit Camera (GSC), and the other is an X-ray CCD array with a total area similar to 200 cm(2), the Solid-state Slit Camera (SSC). The GSC subtends a field of view with an angular dimension of 1degrees x 180degrees while the SSC subtends a field of view with an angular dimension of P times a little less than 180degrees. In the course of one station orbit, MAXI can scan almost the entire sky with a precision of v and with an X-ray energy range of 0.5-30 kev. We have developed an engineering model (EM) for all components of the SSC. Their performance test is ongoing. We have also developed several kinds of CCDs fabricated from different wafers. Since the thermal condition of the ISS is not suitable for the CCD operation, the operating temperature of the CCD estimated to be -85 similar to -50degreesC at the end of mission life. We therefore carefully need to choose CCD considering not only detection efficiency and readout noise, but also the dark current. We report here the current status of the EM of the SSC and the X-ray responsibity of CCDs.

关键词： charge-coupled device X-ray International space Station

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Efficient design method for multi-pump flat-gain fiber Raman amplifiers

Efficient design method for multi-pump flat-gain fiber Raman...

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optical Fiber Communication (OFC) conference

作者： v.E. Perlin H.G. Winful Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

There is much current interest in fiber Raman amplifiers pumped at multiple wavelengths (MW-FRA), which can combine the low-noise advantage of distributed Raman amplification with the possibility of ultra-wide (80 nm ... 详细信息

ISBN: (纸本)1557527008

关键词： design methodology Stimulated emission Page description languages Monte Carlo methods Solid modeling Tail optical fiber amplifiers Semiconductor optical amplifiers Uncertainty optical computing

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A 2.5 Gbps CMOS laser diode driver with preemphasis technique

A 2.5 Gbps CMOS laser diode driver with preemphasis techniqu...

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IEEE Asia-Pacific conference on ASIC (AP-ASIC)

作者： Guo-Cheng Chen Wei-Zen Chen Ren-Hong Luo Department of Electrical Engineering National Central University Chungli Taiwan

This paper describes the design of a 2.5 Gbps laser diode (LD) driver circuit in a 0.35/spl mu/m digital CMOS process. The LD driver delivers a biased current range from 5 to 10 mA and a modulation current of 20 mA. The biased current is programmable by a 3-bit D/A. High current driving capability as well as agile switching speed are achieved by inductive peaking and preemphasis techniques. Operating under a single 3 v power supply, the maximum power consumption is 150 mW. Chip size is 1200/spl mu/m /spl times/ 900/spl mu/m.

关键词： Diode lasers Driver circuits High speed optical techniques optical modulation Power control optical design Stimulated emission Threshold current Preamplifiers CMOS process

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v-22 tiltrotor aircraft vibration monitoring from design to field operations

V-22 tiltrotor aircraft vibration monitoring from design to ...

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IEEE conference on Aerospace

作者： D.A. Dousis Bell Helicopter Textron Inc. Fort Worth Texas

关键词： Monitoring Aircraft propulsion vibrations voice mail Aerospace electronics Drives Engines Poles and towers Shafts Temperature

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Conducted EMI issues and the design of EMI filters for AC power supply feeding a copper vapour type laser

Conducted EMI issues and the design of EMI filters for AC po...

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International conference on Electromagnetic Interference and Compatibility

作者： R. Phulluke v. Agrawal G. Kumar M.S. Bhatia v.K. Madan A.S. Dongare Electrical Engineering Dept Indian Institute of Technology Bombay Mumbai India Bhabha Atomic Research Centre Mumbai India

The switching process of the various devices of the power supply feeding a copper vapour type laser, leads to the generation of conducted EMI. The high speed switching action by a thyratron operating at high voltage and current leads to conducted EMI. Simulation of the conducted EMI from a copper vapour laser has been done using a powerful circuit simulator software SABER. Based on the results obtained by simulation and measurement, it is proposed to design filters that will reduce the conducted EMI to acceptable levels.

关键词： Electromagnetic interference optical design Power filters Power supplies Copper Power lasers Circuit simulation Power generation Thyratrons voltage

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Polymer waveguide optical interconnections for electrical interconnection substrates

Polymer waveguide optical interconnections for electrical in...

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conference on Lasers and Electro-Optics (CLEO)

作者： Sang-Yeon Cho N.M. Jokerst School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA

Summary form only given. An integration process and measured result of a fully embedded thin film MSM photodetector (PD) fabricated from InGaAs which is embedded in a polymer optical waveguide which is deposited on a Si substrate is presented, thus realizing the goal of three separate, independently optimized materials for the waveguide, substrate, and PD. The dark current and photocurrent produced by the evanescent field coupling from the optical waveguide into the embedded MSM PD are shown Measured dark and photocurrent were 60.6 nA and 1.2 /spl mu/A at 5 v, respectively. The coupling efficiency was estimated based on the measured responsivity and photocurrent of the thin film MSM PD and the launched optical power was calculated using a mode matching approach through FIMMWAvE software from Photon design. The estimated coupling efficacy from the input optical waveguide to the embedded MSM PD was 71.74%.

关键词： optical waveguides optical polymers optical interconnections optical films optical surface waves Substrates Photoconductivity optical coupling current measurement Polymer films

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Development of 6.5 kv class IGBT with wide safety operation area

Development of 6.5 kV class IGBT with wide safety operation ...

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Power Conversion conference

作者： K. Mochizuki E. Suekawa S. Iura K. Satoh Fukuryo Semiconductor Engineering Corporation Fukuoka Japan Power Device Division Mitsubishi Electric Corporation Limited Fukuoka Japan

ISBN: (纸本)0780371569

A 6.5 kv IGBT with wide safe operation area (SOA) for the high voltage inverter application is presented. The correlation between turn off energy (E/sub off/) and collector-emitter voltage (v/sub CE/) in PT (punch through)-IGBT is not linear. As Eoff rapidly increases at any v/sub CE/, Eoff becomes larger. A new IGBT makes that correlation linear by a new design concept: light punch through (LPT) concept. Blocking voltage more than rating voltage of 6.5 kv is easily satisfied at Tj=-40/spl sim/125/spl deg/C by the optimization of n-layer thickness (tn-) and resistivity (/spl rho/n-), and LPT concept. Moreover, this new IGBT chip has achieved wide SOA that RBSOA is Jc=140A/cm/sup 2/ at v/sub CE/=4.3kv and Tj=125/spl deg/C and short circuit SOA is t/sub w/=13 /spl mu/s at v/sub CE/=4.3 kv and Tj=125/spl deg/C by optimizing p-well layer.

关键词： Insulated gate bipolar transistors Safety Breakdown voltage Semiconductor optical amplifiers Conductivity Buffer layers Leakage current Ice Temperature dependence Power engineering and energy

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