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Statistical fault diagnosis of wind turbine drivetrain applied to a 5MW floating wind turbine

Journal of Physics: Conference Series 2016年第5期753卷

作者： Mahdi Ghane Amir R. Nejad Mogens Blanke Zhen Gao Torgeir Moan Center for Autonomous Marine Operations and Systems (AMOS) Dept. of Marine Technology and Dept. of Engineering Cybernetics Norwegian University of Science and Technology (NTNU) NO-7491 Trondheim Norway Dept. of Electrical Engineering Technical University of Denmark (DTU) DK 2800 Kgs. Lyngby Denmark

Deployment of large scale wind turbine parks, in particular offshore, requires well organized operation and maintenance strategies to make it as competitive as the classical electric power stations. It is important to ensure systems are safe, profitable, and cost-effective. In this regards, the ability to detect, isolate, estimate, and prognose faults plays an important role. One of the critical wind turbine components is the gearbox. Failures in the gearbox are costly both due to the cost of the gearbox itself and also due to high repair downtime. In order to detect faults as fast as possible to prevent them to develop into failure, statistical change detection is used in this paper. The Cumulative Sum Method (CUSUM) is employed to detect possible defects in the downwind main bearing. A high fidelity gearbox model on a 5-MW spar-type wind turbine is used to generate data for fault-free and faulty conditions of the bearing at the rated wind speed and the associated wave condition. Acceleration measurements are utilized to find residuals used to indirectly detect damages in the bearing. Residuals are found to be nonGaussian, following a t-distribution with multivariable characteristic parameters. The results in this paper show how the diagnostic scheme can detect change with desired false alarm and detection probabilities.

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Distance Based Cooperation Region for D2D Pair

Distance Based Cooperation Region for D2D Pair

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IEEE Vehicular technology Conference

作者： Hafiz A. Mustafa Muhammad Z. Shakir Muhammad A. Imran Rahim Tafazolli Center for Communication Systems Research (CCSR) University of Surrey Electrical and Computer Engineering Dept. Texas A&M University at Qatar

ISBN: (纸本)9781479980895

Device-to-device (D2D) communication is being considered an important traffic offloading mechanism for future cellular networks. Coupled with pro-active device caching, it offers huge potential for capacity and coverage enhancements. In order to ensure maximum capacity enhancement, number of nodes for direct communication needs to be identified. In this paper, we derive analytic expression that relates number of D2D nodes (i.e., D2D user density) and average coverage probability of reference D2D receiver. Using stochastic geometry and poisson point process, we introduce retention probability within cooperation region and shortest distance based selection criterion to precisely quantify interference due to D2D pairs in coverage area. The simulation setup and numerical evaluation validates the closed-form expression.

关键词： Device-to-device communication MPPP Retention probability User density Average coverage probability

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Biomimetic optical sensor for real-time aircraft wing deflection measurement

Biomimetic optical sensor for real-time aircraft wing deflec...

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AIAA Guidance, Navigation, and Control Conference 2015, MGNC 2015 - Held at the AIAA SciTech Forum 2015

作者： Frost, Susan A. Wright, Cameron H. G. Khan, Md. Arif Intelligent Systems Division NASA Ames Research Center M/S 269-3 Moffett FieldCA94035 United States Dept. of Electrical and Computer Engineering University of Wyoming 1000 E. University Ave. LaramieWY82071 United States

ISBN: (纸本)9781510801097

Reducing the environmental impact of aviation is a primary goal of NASA aeronautics research. One approach to achieve this goal is to build lighter weight aircraft, which presents complex challenges due to a corresponding increase in structural flexibility. Wing flexibility can adversely affect aircraft performance from the perspective of aerodynamic efficiency and safety. Knowledge of the wing position during flight can aid active control methods designed to mitigate problems due to increased wing flexibility. Current approaches to measuring wing deflection, including strain measurement devices, accelerometers, or GPS solutions, and new technologies such as fiber optic strain sensors, have limitations for their practical application to flexible aircraft control. Hence, it was proposed to use a biomimetic optical sensor based on the common housefly’s vision system to track wing deflection in real-time. This fly eye sensor has several advantages over conventional sensors used for this application, including light weight, low power requirements, fast computation, and a small form factor. This paper reports on the fly eye sensor development and its application to real-time wing deflection measurement. © 2015, E-flow American Institute of Aeronautics and Astronautics (AIAA). All rights reserved.

关键词： NASA

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26th Annual Computational Neuroscience Meeting (CNS*2017) of the Organization for Computational Neuroscience Antwerp, Belgium, July 15-20, 2017

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BMC NEUROSCIENCE 2017年第SUPPL 1期18卷 59-59页

作者： [Anonymous] Indiana University Purdue University Indianapolis Indianapolis IN 46032 USA Stark Neurosciences Research Institute Indiana University School of Medicine Indianapolis IN 46032 USA Department of Mathematics East Carolina University Greenville NC 27858 USA Jülich Supercomputing Centre Forschungszentrum Jülich 52425 Jülich Germany Future Systems Swiss National Supercomputing Centre 8092 Zurich Switzerland User Engagement and Support Swiss National Supercomputing Centre 6900 Lugano Switzerland Institut de Neurosciences des Systèmes Aix Marseille Univ 13005 Marseille France Simulation Lab Neuroscience Forschungszentrum Jülich Jülich Germany Department of Experimental Psychology Ghent University 9000 Ghent Belgium Donders Center for Cognitive Neuroimaging Radboud University 6525HR Nijmegen The Netherlands Department of Electrical Computer and Energy Engineering University of Colorado Boulder CO 80309 USA Department of Neurosurgery Johns Hopkins School of Medicine Baltimore MD 21287 USA Department of Neurology Johns Hopkins School of Medicine Baltimore MD 21287 USA Department of Otolaryngology Johns Hopkins School of Medicine Baltimore MD 21287 USA INSERM U968 Paris France Sorbonne Universités UPMC University Paris 06 UMR_S 968 Institut de la Vision Paris France CNRS UMR_7210 Paris France Department of Computer Architecture and Technology University of Granada (CITIC) Granada Spain Sorbonne Universités UPMC Univ Paris 06 INSERM CNRS Institut de la Vision Paris France Department of Adaptive Machine Systems Osaka University Osaka Japan Department of Computer Science University of Cergy-Pontoise Cergy-Pontoise France Department of Physics and Astronomy College of Charleston Charleston SC 29424 USA School of Physics Faculty of Science University of Sydney Sydney NSW 2006 Australia Center of Excellence for Integrative Brain Function Australian Research Council Sydney Australia Max Planck Institute for Human Cognitive and Brain Sciences Saxony Lei

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Economic evaluation of energy storage options in a microgrid with Flexible Distribution of Energy and Storage resources 51

Economic evaluation of energy storage options in a microgrid...

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51st IEEE/IAS Industrial and Commercial Power systems Technical Conference, I and CPS 2015

作者： Mao, Daijiafan Khasawneh, Hussam J. Illindala, Mahesh S. Schenkman, Benjamin L. Borneo, Daniel R. Electrical and Computer Engineering Dept. Ohio State University Columbus43210 United States Military Energy and System Analysis Sandia National Laboratories AlbuquerqueNM87185 United States Energy Storage Technology and Systems Sandia National Laboratories AlbuquerqueNM87185 United States

ISBN: (纸本)9781479980635

In this paper, an economic evaluation is carried out for energy storage options in an industrial microgrid comprising four distributed energy resources (DERs). It is assumed that each DER unit is accompanied by Li-ion battery and/or supercapacitor for load following under islanded mode of operation. Cost estimates are made for different energy storage options based on present value of life cycle cost. The cost calculations use published information from the U.S. Department of Energy (DOE), Sandia National Laboratories, and Electric Power Research Institute (EPRI). Two different scenarios of project life, viz., 20 and 30 years, are covered. The economic advantage of using the Flexible Distribution of EneRgy and Storage resources (FDERS) framework in microgrid operation is analyzed. © 2015 IEEE.

关键词： Lithium-ion batteries

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PB-09Alpha-synuclein Binds Unconventional Microtubules That Have a Unique Function

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Microscopy 2017年第SUPPL_1期66卷 i37-i37页

作者： Toba, Shiori Jin, Mingyue Yamada, Masami Matsumoto, Sakiko Yasunaga, Takuo Fukunaga, Yuko Miyazawa, Atsuo Kojima, Hiroaki Arai, Yoshiyuki Nagai, Takeharu Hirotsune, Shinji Osaka City Univ. Grad. Sch. of Medicine Present address: Dept. of Emergency Medical Technology Hirosaki University of Health and Welfare Junior College Faculty of Computer Science and Systems Engineering Kyushu Inst. of Technology Fukuoka Japan JST-SENTAN JST-CREST Grad. Sch. of Life Science Univ. of Hyogo RSC-Univ. of Hyogo Leading Program Center RIKEN SPring-8 Center Advanced ICT Research Inst. National Inst. of Information and Communications Technology and Inst. of Scientific and Industrial Research Osaka Univ. Japan.

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Detection of Drift Sensor Faults in a Class of Nonlinear Uncertain systems

Detection of Drift Sensor Faults in a Class of Nonlinear Unc...

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IEEE Annual Conference on Decision and Control

作者： Yilun Zhou Thomas Parisini Marios M. Polycarpou Imperial College London UK Dept. of Electrical and Electronic Engineering at the Imperial College London UK KIOS Research Center for Intelligent Systems and Networks Dept. of Electrical and Computer Engineering University of Cyprus Nicosia 1678 Cyprus

ISBN: (纸本)9781479978878

The paper presents a drift sensor fault detection scheme for a class of nonlinear uncertain system with partially measurable state variables. A rigorous fault detectability and detection-time interval analysis is illustrated. Moreover, the set of detectable sensor faults is characterized using off-line information and an upper bound on the fault detection interval is derived. Finally, a monotonicity property of the detection-time interval upper bound with respect to the magnitude of sensor faults is presented.

关键词： uncertain systems on-line information Sensors Defect detection State variable Drift Upper bound nonlinearity

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Multimodal 2D Brain computer Interface 37

Multimodal 2D Brain Computer Interface

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37th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBC 2015

作者： Almajidy, Rand K. Boudria, Yacine Hofmann, Ulrich G. Besio, Walter Mankodiya, Kunal Section for Neuroelectronic Systems Dept. of Neurosurgery University of Freiburg Medical Center Freiburg Germany Institute for Signal Processing University of Luebeck Luebeck Germany College of Medicine University of Diyala Diyala Iraq Department of Electrical Computer and Biomedical Engineering University of Rhode Island KingstonRI United States

ISBN: (纸本)9781424492718

In this work we used multimodal, non-invasive brain signal recording systems, namely Near Infrared Spectroscopy (NIRS), disc electrode electroencephalography (EEG) and tripolar concentric ring electrodes (TCRE) electroencephalography (tEEG). 7 healthy subjects participated in our experiments to control a 2-D Brain computer Interface (BCI). Four motor imagery task were performed, imagery motion of the left hand, the right hand, both hands and both feet. The signal slope (SS) of the change in oxygenated hemoglobin concentration measured by NIRS was used for feature extraction while the power spectrum density (PSD) of both EEG and tEEG in the frequency band 8-30Hz was used for feature extraction. Linear Discriminant Analysis (LDA) was used to classify different combinations of the aforementioned features. The highest classification accuracy (85.2%) was achieved by using features from all the three brain signals recording modules. The improvement in classification accuracy was highly significant (p = 0.0033) when using the multimodal signals features as compared to pure EEG features. © 2015 IEEE.

关键词： biomedical electrodes brain-computer interfaces electroencephalography feature extraction infrared spectra medical signal processing signal classification BCI EEG LDA classification accuracy disc electrode electroencephalography frequency 8 Hz to 30 Hz imagery motion linear discriminant analysis motor imagery task multimodal 2D brain computer interface multimodal noninvasive brain signal recording systems near infrared spectroscopy oxygenated hemoglobin concentration power spectrum density signal slope tripolar concentric ring electrode electroencephalography Accuracy Band-pass filters Brain-computer interfaces Electrodes Electroencephalography Feature extraction Spectroscopy Near Infrared Spectroscopy multimodal Brain computer Interface tripolar concentric ring electrodes (TCRE) Feature extraction Brain-computer Interfaces Electroencephalography Near infrared spectroscopy near infrared reflectance spectroscopy Power spectral density Band-pass filters biomedical electrodes medical signal processing signal classification Linear discriminant analysis laser Doppler anemometry Anterior interventricular branch of left coronary artery Left-sided displacement of abomasum Electrodes

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Energy-efficient Traffic Bypassing in LTE HetNets with Mobile Relays

Energy-efficient Traffic Bypassing in LTE HetNets with Mobil...

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IEEE International Conference on Wireless and Mobile Computing, Networking and Communications

作者： George T. Karetsos Angelos Rouskas Fotis Foukalas Dept. of Computer Engineering Technology Education Institute of Thessaly Larissa GR-41110 Greece Dept. of Digital Systems University of Piraeus Piraeus GR-18534 Greece Dept. of Electrical Engineering Qatar University Qatar

ISBN: (纸本)9781467377027

One of the core technologies being standardized by 3GPP for LTE-A is the introduction of Relay Nodes (RNs). RNs are intended for ensuring coverage at cell edges as well as for the provision of enhanced capacity at hot spot areas. An extension to this concept is the Mobile Relay (MR). MRs can be mounted on vehicles and the original idea is to serve users inside high speed trains thus counter fighting the inherent severe fading and vehicle penetration loss. In this work we present a framework for exploiting Mobile Relay (MRs) even at low speeds in urban environments for bypassing traffic from nearby users, either within or outside the vehicles. In particular we show that apart from increased capacity and good quality coverage this approach achieves important energy savings for the mobile terminals.

关键词： heterogeneous network mobile relay energy efficiency traffic bypassing offloading Heterogeneous networks UNLOADING Energy efficiency relay vehicle energy saving bypasses Key technology 3GPP mobile terminal low speed Mobile urban environment Local thermodynamic equilibrium Long Term Evolution

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Jitter analysis and measurement in subthreshold source-coupled differential ring oscillators

Jitter analysis and measurement in subthreshold source-coupl...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Mahsa Shoaran Armin Tajalli Massimo Alioto Yusuf Leblebici Microelectronic Systems Laboratory (LSM) Swiss Federal Institute of Technology (EPFL) Lausanne Dept. of Electrical and Computer Engineering National University of Singapore Singapore

ISBN: (纸本)9781479983926

The jitter and the phase noise of ring oscillators utilizing subthreshold source-coupled logic (STSCL) style are analyzed in this paper. Closed-form equations are derived to predict the jitter and phase noise caused by white and flicker noise. Measurement results of a test chip fabricated in a standard CMOS 90 nm technology are presented to validate these expressions. The performed analysis shows that jitter in STSCL-based ring oscillator is independent of technology parameters, as opposed to its CMOS counterparts that depend on supply voltage and parameters of technology. Based on measured results, noise on current control line can dominate the total jitter of the oscillator. Design guidelines are proposed to limit the jitter effect of ring oscillators using STSCL logic. The proposed STSCL-based ring oscillator achieves an average RMS jitter as low as 0.24 % of the oscillation period at a 1.08 MHz/μA energy efficiency, which demonstrates its suitability for ultra-low-power applications.

关键词： Jitter Ring oscillators Noise Logic gates Delays Current measurement

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