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检索条件"机构=Advanced Computer Engineering Lab"

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Simple RealTime Condition Monitoring Tools for LowCost Motor Drives

Simple RealTime Condition Monitoring Tools for LowCost Motor...

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International Conference on Electrical Machines and Systems 2007(ICEMS2007)(第十届国际电机与系统会议)

作者： Hamid A. Toliyat Bilal Akin Umut Orguner Mark Rayner Advanced Electric Machines & Power Electronics Lab.Department of Electrical and Computer Engineering Dept. of Electrical Engineering Middle East Technical University Balgat Ankara 06531 Turkey Research & Development Center Toshiba Industrial Corporation College Station Division Bryan TX 7780

In this paper, two simple digital signal processor (DSP)-based motor fault signature detection techniques are presented. First, the reference frame theory and its applications to fault diagnosis of electric machinery are introduced. Second, phase sensitive detection (PSD) of motor fault signatures is presented. Both techniques provide very simple and robust way to find the magnitude and phase of the specified fault signatures in the line current. Particularly, PSD has a powerful line current noise suppression capability while detecting the fault signatures. Various faults are experimentally tested both offline using the data acquisition system, and online employing the TMS320F2812 DSP to prove the efficacy of the proposed tools. The advantages of these methods include the following: (1) no need to employ external hardware or a PC running a high level program. (2) provides instantaneous fault monitoring using a DSP controller in real time. (3) embedded into the motor drive. thus, readily available drive sensors and the core processor are used without employing additional hardware. (4) no need to store machine currents data, and thus no need for large memory size. (5) very short convergence time capability. (6) immune to non idealities like sensor dc offsets, imbalance, etc. . (7) no need for a notch filter to filter out the fundamental harmonic. (8) steady state or stationary current signal assumptions are not necessary. (9) a familiar concept for motor control engineers. and (10) applicable to all multiphase and single phase motors.

关键词： Condition monitoring Motor drives Electrical fault detection Digital signal processing Hardware Filters Digital signal processors Fault diagnosis Machinery Phase detection

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Demonstration of a task-flow based aircraft collaborative design application in optical grid 33

Demonstration of a task-flow based aircraft collaborative de...

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2007 33rd European Conference and Exhibition of Optical Communication, ECOC 2007

作者： Wang, Zhengyu Guo, Wei Sun, Zhenyu Jin, Yaohui Sun, Weiqiang Hu, Weisheng Lin, Xinhua Wu, Min-You Liu, Hong Fu, San Yuan, Jun Qiao, Chunming State Key Lab. on Fiber-Optic Local Area Networks and Advanced Optical Communication systems Shanghai JiaoTong University Shanghai200240 China Grid Computing Center Shanghai JiaoTong University Shanghai200240 China Institute of Aerospace Science and Technology Shanghai JiaoTong University Shanghai200240 China Shanghai Supercomputer Center Shanghai201203 China Computer Science and Engineering State University of New York BuffaloNY14260 United States

One task-flow scheduler has been designed to optimally allocate resources for a task-flow based Aircraft Collaborative Design Application in Optical Grid. This scheduler and application has been deployed on an Optical... 详细信息

ISBN: (纸本)9783800730421

关键词： Scheduling

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Comparative study of coherent, non-coherent, and semi-coherent integration schemes for GNSS receivers

Comparative study of coherent, non-coherent, and semi-cohere...

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63rd Annual Meeting of the Institute of Navigation 2007

作者： Miller, Mikel Nguyen, Thao Yang, Chun Blasch, Erik Air Force Research Lab. MNG Air Force Research Lab. SNRN Sigtem Technology Inc. Air Force Research Lab. SNAA Department of Electrical and Computer Engineering Miami University of Ohio Advanced Guidance Division Munitions Directorate Air Force Research Laboratory Eglin AFB FL Department of EE AFIT Miami University of Ohio ION RTN IEEE AIAA Assessment and Integration Branch Sensors Directorate Air Force Research Laboratory WPAFB OH AFIT SPIE Wright-Patterson AFB OH Reference Systems Branch Sensors Directorate Air Force Research Laboratory WPAFB OH

ISBN: (纸本)1604232862

Three integration schemes, namely, coherent, noncoherent, and semi-coherent integration, and their variants are described in this paper for signal detection and tracking in such applications as pulsed Doppler radar and GPS receiver. We adopt a unified approach to present such integration schemes as best approximations to the likelihood ratio test (LRT) when the signal models are partially known to different extents. Formulas for the conditional probability density functions (pdfs) of the sufficient statistic under alternative hypotheses as well as the probability of detection (Pd) and probability of false alarm (Pfa) are given. Integration improvement factors and integration losses are then formulated. Connections of the semi-coherent integration scheme to the cyclic autocorrelation function, the discrete-time Wigner-Ville transform, and the radar ambiguity function are also outlined. Although most of the results are available in the literature, they are scattered in different textbooks and research papers. By presenting them in a cohesive and concise manner, the paper can serve as (1) an introductory material with key references for those who would like to study the subject further, (2) a quick reference for those who would like to compare these integration schemes, and (3) an integrated approach under varying conditions. Simulation results are presented to compare these integration schemes in terms of detection performance (P d and Pfa) as a function of signal to noise ratio (SNR) and integration interval under two operating conditions. One is for a signal with constant Doppler frequency and the other is for a linear frequency modulation signal (i.e., a chirp signal). We show the curves of the input SNR required under different chirp rates so as to maintain the same detection performance, the resulting LRTs for the different approaches, as well as simulated comparisons between trade-offs of Pd versus SNR.

关键词： Signal receivers

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Improved Rotor Position Estimation employing Voltage Distortion Compensation for Sensorless PMSM Drives at Low Speed

Improved Rotor Position Estimation employing Voltage Distort...

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International Conference on Power Electronics

作者： Shin-Myung Jung Jin-Sik Park Hag-Wone Kim Myung-Joong Youn Department of Electrical Engineering and Computer Science Korea Advanced Institude Science and Technology 373-1 Guseong-Dong Yuseong-Gu Daejeon Korea Digital Appliance Lab. LG Electronics Co. Ltd. Seoul 153-023 Korea

ISBN: (纸本)9781424418718

The PMSM is inherently electronically controlled and requires rotor position information for proper drives. However, the problems of the space, cost, and reliability of rotor position sensors have motivated research in the area of position sensorless PMSM drives. Numerous rotor position sensorless control techniques have been proposed for PMSM drives, but most rely directly or indirectly on the estimation of the rotor flux linkage vector. The performance of this method is poor due to the voltage distortions caused by the nonlinear behavior of a pulsewidth-modulation (PWM) voltage source inverter (VSI). In this paper, the nonlinearity in a PWM VSI is analyzed and a new online estimation method is proposed to compensate the voltage distortion. To prove effectiveness of the voltage distortion compensation method to the improvement of the rotor position estimation, the proposed method is applied to PMSM drive system and implemented in a digital manner using a digital signal processor.

关键词： Voltage distortion Permanent magnet synchronous machines rotor position low speed position estimation Automobile driving DRIVES Sensors POSITION INFORMATION voltage source inverter drive train

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Sampling Rate Scheduling and Digital Filter Co-design of Networked Supervisory Control System

Sampling Rate Scheduling and Digital Filter Co-design of Net...

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2007 IEEE International Symposium on Industrial Electronics (ISIE 2007), vol.7

作者： Zheng Li Mo-Yuen Chow Advanced Diagnosis Automation and Control Lab Department of Electrical & Computer Engineering North Carolina State University Raleigh NC USA

A networked supervisory control system is one type of Networked Control Systems (NCS) in which a supervisor monitors and analyzes remote plants via communication network. This paper proposes an adaptive multiple sampling rate scheduling (AMSRS) methodology with digital filters in the signal process steps of the control loop to maintain the transmitted measurement signals' fidelity in order to help supervisor's decision making under normal and faulty operating conditions. Specifications of digital filters are chosen according to the system's frequency domain characteristics to bound the signal sampling and reconstruction errors as well as conserve available resource. A networked high throughput screening (HTS) process supervisory control system is used as a case study in this paper to demonstrate the effectiveness of using digital filters in the sampling rate scheduling method. A comparison between using the digital filter and previous zero-order hold approach [1] in signal reconstruction shows that digital filters can further reduce the reconstruction error. Furthermore, the use of filters extensively reduces the amount of consuming bandwidth (resource) in signal sampling and transmission (e.g., 40% and 56% bandwidth saved by two types of digital filters in specific case), and improves the system performance bounded by the limited resources.

关键词： Sampling methods Digital filters Supervisory control Signal sampling Signal processing Bandwidth Networked control systems Communication networks Programmable control Adaptive control

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Location verification using bidirectional one-way hash function in wireless sensor networks

Location verification using bidirectional one-way hash funct...

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作者： Lee, Yann-Hang Lee, Jin Wook Phadke, Vikram Deshmukh, Amit Department of Computer Science and Engineering Arizona State University Tempe AZ 85287-8809 United States Networking Technology Lab. Samsung Advanced Institute of Technology P.O. Box 111 Suwon 440-600 Korea Republic of Software Group Qualcomm Inc. 5775 Morehouse Drive San Diego CA 92121 United States Software Group Siemens Information and Communication Mobile LLC 16745 West Bernardo Drive San Diego CA 92127 United States

Evolving networks of wireless ad hoc sensing nodes have many attractive applications. Localisation, that is to determine where a given node is physically located, is a key enabler for many applications of sensor *** sensor networks move closer to extensive deployments, security becomes a major concern, resulting in a new demand for secure localisation and location proving systems. We propose a secure localisation system based on a secure hop algorithm. A location verification system that allows the base station to verify the location claims of sensor nodes is also presented. It prevents a node from falsifying reported location information and can be used for location-based access control. In order to support the resource-constrained sensor nodes, the proposed approach makes use of efficient one-way hash functions. Finally, we report the evaluation of the secure localisation system. The proposed scheme performs well under a range of scenarios tested and is resilient against an attacker creating incorrect location information in other nodes. Copyright © 2007 Inderscience Enterprises Ltd.

关键词： Sensor nodes

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Scheduling a Life Science High-Throughput Platform under Starvation Constraints Using Timed Transition Petri Nets and Heuristic Search

Scheduling a Life Science High-Throughput Platform under Sta...

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2007 IEEE International Symposium on Industrial Electronics (ISIE 2007), vol.5

作者： Tao Hong Mo-Yuen Chow Perry Haaland Dylan Wilson Robert Walker Advanced Diagnosis Automation and Control Lab Department of Electrical & Computer Engineering North Carolina State University Raleigh NC USA BD Technologies NC USA

High-Throughput (HT) platforms have been increasingly used in the life science area for diverse bio-chemical experiments. This paper addresses the scheduling of HT platform based experiments under multiple constraints, such as operation constraints, resource constraints and starvation constraints. We use timed transition Petri nets (PN) to model the experimental process with constraints. We first propose the transition variant property of the PN model. We then propose the HCH (Hong-Chow-Haaland) algorithm, which is customized from A{sup}* algorithm, to find a feasible solution. HCH algorithm is more efficient than L1 algorithm and most other A{sup}* extended algorithms in identification of new markings when applied to the transition variant PN. We then applied HCH algorithm to two typical HT processes. The results show that HCH algorithm can be used to find optimal solutions with the time complexity of identifying new markings less than 2% of the L1 algorithm.

关键词： Petri nets Job shop scheduling Scheduling algorithm Humans Processor scheduling Automation USA Councils Resource management Mathematical model Chemical compounds

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Bidirectional ROADM using a 3×N AWG

Bidirectional ROADM using a 3×N AWG

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2007 Pacific Rim Conference on Lasers and Electro-Optics (CLEO/PACIFIC RIM 2007), vol.3

作者： Kwanil Lee Sang Bae Lee Sil-Gu Mun Chang Hee Lee Photonics Research Lab Korea Institute of Science and Technology (KIST) 39-1 Hawolgok-dong Seongbuk-gu Seoul 136-791 KOREA Department of Electrical Engineering and Computer Science and Technology Korea Advanced Institute of Science and Technology (KAIST) 373-1 Guseong-dong Yuseong-gu Daejon 305-701 KOREA

ISBN: (纸本)1424411742

A novel bidirectional optical add-drop multiplexer using AWG is proposed for the optical transport networks. By use of circulators in the coupled fold-back paths between the demultiplexed channels, we improved the loss margin and the crosstalk performances. Also the experimental results are discussed for its application to wavelength-division-multiplexed transmission.

关键词： Arrayed waveguide grating multiplexers Arrayed waveguide gratings Optical add drop multiplexers Optical circulators Optical networks Reconfigurable optical add drop multiplexers

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Protection Architecture for WDM based Access Network with Colorless ONUs

Protection Architecture for WDM based Access Network with Co...

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2007 Pacific Rim Conference on Lasers and Electro-Optics (CLEO/PACIFIC RIM 2007), vol.3

By utilizing 2×N arrayed waveguide gratings, we demonstrate a novel protection architecture for WDM-PON employing colorless optical network units (ONU). The recovery time against the feeder fiber failure was less... 详细信息

ISBN: (纸本)1424411742

关键词： Array waveguide devices Light sources Optical networks Passive optical networks Signal recovery Waveguide gratings

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Demonstration of a Task-flow based Aircraft Collaborative Design Application in Optical Grid

Demonstration of a Task-flow based Aircraft Collaborative De...

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33rd European Conference and Exhibition of Optical Communication

作者： Zhengyu Wang Wei Guo Zhenyu Sun Yaohui Jin Weiqiang Sun Weisheng Hu Xinhua Lin Min-You Wu Hong Liu San Fu Jun Yuan Chunming Qiao State Key Lab on Fiber-Optic Local Area Networks and Advanced Optical Communication systems Shanghai Jiao Tong University P. R. China 200240 Grid Computing Center Shanghai Jiao Tong University China 200240 Institute of Aerospace Science and Technology Shanghai Jiao Tong University China 200240 Shanghai Supercomputer Center Shanghai China 201203 Computer Science & Engineering State University of New York at Buffalo NY 14260 USA

关键词： Computational modeling Atmospheric modeling Numerical models Performance evaluation Optical design Aerodynamics

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