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OC6 Phase I: Investigating the underprediction of low-frequency hydrodynamic loads and responses of a floating wind turbine

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Journal of Physics: Conference Series 2020年第3期1618卷

作者： A N robertson S Gueydon E Bachynski L Wang J Jonkman d Alarcón E Amet A Beardsell P Bonnet B Boudet C Brun Z Chen M Féron d Forbush C Galinos J Galvan P Gilbert J Gómez V Harnois F Haudin Z Hu J Le dreff M Leimeister F Lemmer H Li G Mckinnon I Mendikoa A Moghtadaei S Netzband S Oh A Pegalajar-Jurado M Q Nguyen K ruehl P Schünemann W Shi H Shin Y Si F Surmont P Trubat J Qwist S Wohlfahrt-Laymann National Renewable Energy Laboratory 15013 Denver W Pkwy Golden CO USA 80401 Maritime Research Institute Netherlands Haagsteeg 2 6708 PM Wageningen Netherlands Norwegian University of Science and Technology 7491 Trondheim Norway Bureau Veritas 60 avenue du Général de Gaulle 92046 Paris - La Défense DNV GL One Linear Park Avon St. Temple Quay Bristol BS2 0PS UK Siemens Digital Industries Software C/Lluis Muntadas 5 Cornellà Spain 08940 Bureau Veritas 8 avenue Jacques Cartier Atlantis - 44807 Saint-Herblain Cdx - France Ocean College Zhejiang University Zhoushan 316021 China DORIS Engineering 58a rue du Dessous des Berges 75013 Paris France Sandia National Laboratories 1515 Eubank Blvd SE Albuquerque NM 87123 DTU Wind Energy Nils Koppels Allé 403 Kgs. Lyngby DK-2800 Denmark Tecnalia Research & Innovation Parque Tecnologico Bizkaia Ed.700 48160 Derio Spain IFPEN 4 avenue de Bois Préau 92852 Rueil-Malmaison Cedex France PRINCIPIA ZAC Athelia I - 215 Voie Ariane 13705 La CIOTAT Cedex France Vulcain Ingénierie 5 rue Beffroy 92200 Neuilly-sur-Seine France School of Engineering Newcastle University Newcastle upon Tyne NE1 7RU UK EDF R&D 7 boulevard Gaspard Monge 91120 Palaiseau France Fraunhofer Inst. for Wind Energy Systems Am Luneort 100 27572 Bremerhaven Germany University of Stuttgart 70569 Stuttgart Germany Orcina Ltd. Daltongate Ulverston Cumbria LA12 7AJ UK Queen's University Belfast Belfast BT9 5AG Northern Ireland United Kingdom Hamburg University of Technology 21071 Hamburg Germany ClassNK 4-7 Kioicho Chiyodaku Tokyo Japan Universität Rostock Albert-Einstein-Str. 2 18059 Rostock Germany Dalian University of Technology No.2 Linggong Road Dalian Liaoning China 116024 University of Ulsan 93 Daehakro Namgu Ulsan 44610 South Korea Universitat Politècnica de Catalunya Jordi Girona 1-3 08034 Barcelona Spain 4Subsea Hagaløkkveien 26 1383 Asker Norway

Phase I of the OC6 project is focused on examining why offshore wind design tools underpredict the response (loads/motion) of the OC5-deepCwind semisubmersible at its surge and pitch natural frequencies. Previous investigations showed that the underprediction was primarily related to nonlinear hydrodynamic loading, so two new validation campaigns were performed to separately examine the different hydrodynamic load components. In this paper, we validate a variety of tools against this new test data, focusing on the ability to accurately model the low-frequency loads on a semisubmersible floater when held fixed under wave excitation and when forced to oscillate in the surge direction. However, it is observed that models providing better load predictions in these two scenarios do not necessarily produce a more accurate motion response in a moored configuration.

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Battery Energy Management in Heterogeneous Wireless Machine-to-Machine Networks

Battery Energy Management in Heterogeneous Wireless Machine-...

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IEEE Conference on Vehicular Technology (VTC)

作者： Kaikai Liu Jianlin Guo Philip Orlik Kieran Parsons Kentaro Sawa Scalable Software Systems Lab University of Florida Mitsubishi Electric Research Laboratories Cambridge MA USA Mitsubishi Electric Corporation IT R&D Center Ofuna Kamakura Kanagawa Japan

ISBN: (纸本)9781479980925

The IETF standardized the IPv6 routing Protocol for Low-Power and Lossy Networks (rPL) to meet routing requirements of the emerging applications. rPL is a distributed routing protocol and shows good scalability and fast network setup. However, rPL does not support sleep operation well. To provide efficient energy management and enhance rPL for sleep operation support, this paper presents battery energy management solutions for heterogeneous wireless machine-to-machine networks containing both battery powered nodes and mains powered nodes. We introduce a distributed sleep model for battery powered nodes to manage their own sleep schedules based on their internal parameters and observed network conditions. We propose two broadcast message delivery methods for battery operated networks that use distributed sleep control. Two battery node aware routing metrics are introduced to discover more battery energy efficient routes. We also present a battery energy efficient routing protocol called B-rPL to leverage distributed sleep model and introduced routing metrics. A battery energy efficient data packet transmission and forwarding method is provided to select the most battery energy efficient route among multiple active routes to transmit and forward data packets. Simulation results show that compared with standard rPL, the proposed B-rPL can extend network lifetime by two times and improve data packet delivery rate by 75%.

关键词： Batteries routing Measurement Wireless communication routing protocols Wireless sensor networks Schedules

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Object Composition Identification via Mediated-reality Supplemented radiographs

Object Composition Identification via Mediated-Reality Suppl...

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IEEE Nuclear Science Symposium

作者： Edward S. Jimenez Laurel J. Orr Kyle r. Thompson Sandia National Laboratories Software Systems R&D in Albuquerque NM 87185-0933 USA

ISBN: (纸本)9781479960989

This exploratory work investigates the feasibility of extracting linear attenuation functions with respect to energy from a multi-channel radiograph of an object of interest composed of a homogeneous material by simulating the entire imaging system combined with a digital phantom of the object of interest and leveraging this information along with the acquired multi-channel image. This synergistic combination of information allows for improved estimates on not only the attenuation for an effective energy, but for the entire spectrum of energy that is coincident with the detector elements. Material composition identification from radiographs would have wide applications in both medicine and industry. This work will focus on industrial radiography applications and will analyse a range of materials that vary in attenuative properties. This work shows that using iterative solvers holds encouraging potential to fully solve for the linear attenuation profile for the object and material of interest when the imaging system is characterized with respect to initial source x-ray energy spectrum, scan geometry, and accurate digital phantom.

关键词： Attenuation radiography Lead Polyethylene detectors Tin

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Cluster-Based Approach to a Multi-GPU CT reconstruction Algorithm

Cluster-Based Approach to a Multi-GPU CT Reconstruction Algo...

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IEEE Nuclear Science Symposium

作者： Laurel J. Orr Edward S. Jimenez Kyle r. Thompson Sandia National Laboratories Software Systems R&D Sandia National Laboratories Structural Dynamics & X-Ray Non-Destructive Evaluation

ISBN: (纸本)9781479960989

Conventional CPU-based algorithms for Computed Tomography reconstruction lack the computational efficiency necessary to process large, industrial datasets in a reasonable amount of time. Specifically, processing time for a single-pass, trillion volumetric pixel (voxel) reconstruction requires months to reconstruct using a high performance CPU-based workstation. An optimized, single workstation multi-GPU approach has shown performance increases by 2-3 orders-of-magnitude;however, reconstruction of future-size, trillion voxel datasets can still take an entire day to complete. This paper details an approach that further decreases runtime and allows for more diverse workstation environments by using a cluster of GPU-capable workstations. due to the irregularity of the reconstruction tasks throughout the volume, using a cluster of multi-GPU nodes requires inventive topological structuring and data partitioning to avoid network bottlenecks and achieve optimal GPU utilization. This paper covers the cluster layout and non-linear weighting scheme used in this high-performance multi-GPU CT reconstruction algorithm and presents experimental results from reconstructing two large-scale datasets to evaluate this approach's performance and applicability to future-size datasets. Specifically, our approach yields up to a 20 percent improvement for large-scale data.

关键词： Workstations reconstruction algorithm dataset pixel reconstructive Surgical Procedures Computational efficiency X-ray Computed Tomography runtime

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Stability Metric Based routing Protocol for Low-Power and Lossy Networks

Stability Metric Based Routing Protocol for Low-Power and Lo...

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IEEE International Conference on Communications

作者： Xin Yang Jianlin Guo Philip Orlik Kieran Parsons Koichi Ishibashi Scalable Software Systems Lab University of Florida Gainesville FL USA Electronics and Communications Mitsubishi Electric Research Laboratories Cambridge MA USA Wireless Modules Development Center Mitsubishi Electric Corporation IT R&D Center Ofuna Japan

To design a routing protocol for applications over low-power and lossy networks (LLNs), the IETF rOLL Working Group standardized the IPv6 routing Protocol for LLNs (rPL), which organizes nodes in a LLN into a tree-like topology called destination Oriented directed Acyclic Graph (dOdAG). rPL shows good scalability and fast network setup. However, it may suffer from severe unreliability due to the selection of suboptimal routes with low quality links. To optimize the reliability of rPL routes, this paper proposes a stability metric based routing protocol named srPL for reliable routing and data collection in LLNs. We introduce a new routing metric for rPL called stability index (SI), which exploits stability characteristics of rPL nodes to select more stable routes. In addition, we present a passive and lightweight network layer technique to measure the bi-directional expected transmission count (ETX) for wireless links in LLNs. As a use case of SI, we combine SI metric with ETX metric to make routing decisions. Simulation results show that srPL can improve packet delivery rate of rPL routing protocol by 20%.

关键词： Measurement Silicon routing protocols routing Stability criteria

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darT++: dashboard for reengineering tools: An static code visualization tool for architecture recovery and reconstruction 14

DaRT++: Dashboard for reengineering tools: An static code vi...

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14th International software Product Line Conference, SPLC 2010

作者： Jung, Ji-Yong Kim, Tae-Hyung Google Android Group Mobile Comm. Business Samsung Electronics Suwon Korea Republic of Software Engineering Laboratories DMC R&D Center Samsung Electronics Suwon Korea Republic of

ISBN: (纸本)9781862202740

In this paper, darT++ (dashboard for reengineering Tools) is introduced. To support the reengineering process of the software systems written in C or C++, darT++ provides the logical packaging that is the abstract grouping and classifying mechanism to construct a virtual structure and represent it in matrix-based and graph-based formats. In addition, darT supports various metrics that is important to analyze the software systems. A case study based on a reengineering project of the embedded software system for the real printer products illustrates how darT++ is applied, which also shows its usefulness and effectiveness. © 2010 SPLC 2010 - Proceedings of the 14th International software Product Line Conference. All rights reserved.

关键词： reengineering

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New drM model in distributed environments

New DRM model in distributed environments

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Consumer Communications and Networking Conference, CCNC IEEE

作者： SangGyoo Sim YunSang Oh System R&D Laboratories Samsung Electronics Software Center Seoul South Korea

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Parallel Optimization of Forging Processes for Optimal Material Properties

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AIP Conference Proceedings 2004年第1期712卷 2080-2084页

作者： Michael L. Chiesa reese E. Jones Kenneth J. Perano Tamara G. Kolda *Sandia National Laboratories Engineering Mechanics Modeling and Simulation Department MS9042 PO Box 969 Livermore CA 94550 lusSandia National Laboratories Science‐Based Materials Modeling Department MS9405 PO Box 969 Livermore CA 94550 oundSandia National Laboratories Advanced Software R&D Department MS9915 PO Box 969 Livermore CA 94550 §Sandia National Laboratories Computational Sciences and Mathematics Research Department MS9217 PO Box 969 Livermore CA 94550

Validated, internal state variable constitutive models are developed to model the complex multi‐stage forging process and predict the final forging strength and microstructure. Optimization methodologies are then used on a high performance, parallel computer to design the forging dies and temperatures that would meet minimum and maximum strength requirements and result in maximum strength uniformity. Each node on the parallel computer solves a unique finite element simulation including parametric meshing, post‐processing and metric determination. Nine shape parameters and one process parameter (temperature) are optimized to reduce strength non‐uniformity. The final process design, based on over 360 finite element simulations, meets all material requirements and results in a near uniform strength part.

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Internet Technologies demonstration Session I

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Proceedings of the Human Factors and Ergonomics Society Annual Meeting 1999年第13期43卷 804 - 806页

作者： Eric Grose Thomas S. Woods Judy Cantor Michael Etgen Mary Czerwinski Tanya L. Payne Wendy Chisholm Nick Iozzo Sandia National Laboratories Albuquerque New Mexico Ameritech Inc. Hoffman Estates Illinois AT&T Labs Middletown New Jersey Microsoft Corp. Redmond Washington Kazan Software Austin Texas Trace R&D Center University of Wisconsin Madison Zefer Chicago Illinois

This session will highlight recent technical innovations in user interface technologies for the Internet. The Internet poses many unique challenges for the user interface designer. It also enables functional capabilities that may be applied in a variety of domains. Attendees will have an opportunity to have first-hand experience with developmental technologies that offer a sampling of the latest ideas. developers participating in the session will interact with small groups of attendees and provide a brief demonstration and discussion. Through this session, the intent is to raise HFES attendee's awareness of the direction of technological innovation for the Internet and to provide a context for the exchange of insights and ideas among all those concerned with interface design and product design in general, for the Internet.

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A basic study on power storage capacitor systems

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ELECTrICAL ENGINEErING IN JAPAN 1996年第3期116卷 40-51页

作者： Okamura, M Okamura Laboratory Inc. [?]B.S. degree in 1959 from the Department of Electrical Engineering Waseda University. He joined Nippon Atomic Industry Group Co. the same year and studied at Argonne National Laboratories (U.S.) in 1964–65. He left the company and established the Okamura Laboratory Inc. in 1987. He is engaged in R&D of radiation measurements electronic circuits computer applications and software. Member of the Japan Nuclear Society and the Electrical Society.

Storage batteries or pumped hydraulic power stations have been used to store electric energy. However, there are problems with storage batteries, e.g., long charging time, limited cycle life, low Coulomb efficiency, and inaccurate residual power meters. Because of these problems, practical power applications have not been achieved. To solve these problems, a complex system of capacitors and electronic circuits called the ECS (Energy Capacitor System) is proposed. The capacitor part of the ECS is a group of electric double-layer capacitors of increased energy density. The circuits part is built around switching regulators. Although the capacitors alone are not capable of delivering stable output, the accompanying circuits compensate for various characteristics throughout the charge and discharge cycle. This combination of capacitors and electronic circuits increases the energy density by about 16 times that of the conventional electric double-layer capacitors, close to the level of lead-acid batteries but with lower output resistance and better voltage stability. The ECS inherently features short charging time, very long cycle life, and good Coulomb efficiency. The cells are completely sealed and made from materials which are not harmful to the environment.

关键词： electrical power storage device secondary battery electric double-layer capacitor switching regulator energy density power density

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