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Nonlinear internal wave run-up on impermeable steep slopes

Journal of Offshore Mechanics and Arctic engineering 2009年第4期131卷 1-5页

作者： Tseng, I-Fan Chen, Chen-Yuan Kuo, Hui-Ming Department of Marine Environment and Engineering National Sun Yat-Sen University Kaohsiung 80424 Taiwan Department of Computer Science National Pingtung University of Education No. 4-18 Ming Shen Rd. Pingtung 90003 Taiwan Department of Management Information System Yung-Ta Institute of Technology and Commerce Lin-Luoh Pingtung 90941 Taiwan Doctoral Program in Management National Kaohsiung First University of Science and Technology Kaohsiung Taiwan Department of Logistics Management Shu-Te University Yen Chau Kaohsiung 82445 Taiwan

Laboratory experiments were conducted to investigate the run-up of internal solitary waves (ISWs) on steep uniform slopes in a two-layered fluid system with a free surface. A 12 m long wave flume, which incorporated a movable vertical gate for generating ISWs, was used in the experiments. A steep uniform slope was modeled at one end of the flume. In the present study we looked at internal waves with small and large amplitudes using a steep uniform slope (from one of Θ=30, 50, 60, 90, 120, and 130 deg) much longer than those previously published in the literature. Results collected from a wide range of experimental runs show that the run-up height depends on the planar slope, while the breaking depth is only antecedent to the amplitude of an ISW. The overall quantitative agreement with the linear feature aspects of the incident wave amplitude is encouraging. Copyright © 2009 by ASME.

关键词： Arctic engineering

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Mechanical modeling and finite element analysis of porous cast products

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Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision engineering 2008年第12期74卷 1273-1277页

作者： Esmaeili, N. Alvesand, J.L. Teodosiu, C. VCAD System Research Program RIKEN Japan Department of Mechanical Engineering University of Minho Portugal

A study was conducted to develop a methodology to perform finite element (FE)-based simulations of the micromechanical response on actual three-dimensional (3D) microstructures. It was demonstrated that the methodology was applicable to other 3D image acquisition techniques, such as X-ray computed tomography. The simplifications performed in image manipulation and voxelization retained the major features of the pores, including their high angular morphology and orientation. A parallelepipedic volume of about 20 &19 &15 mm3 size and average porosity of about 0.05 were extracted from a car engine block made of an aluminum cast alloy to conduct the investigations. The 3D pore morphology was reconstructed from the stack of 3900 serial sections. The simulations were performed on 12 cubic subdomains of the parallelepipedic volume having the size of 3.31&1.77&2.98 mm3 where the porosity volume fraction varied from about 0.022% up to 25%.

关键词： Fracture

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Conditional IMS Learning Design Generation Using User Modeling and Planning Techniques

Conditional IMS Learning Design Generation Using User Modeli...

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International Conference on Advanced Learning Technologies (ICALT)

作者： Jorge Hernandez Silvia Baldiris Olga C. Santos Ramón Fabregat Jesus G. Boticario System Engineering Program Corporación Universitaria de la Costa Colombia Institute of Informatics and Aplications (IliA) Universidad de Girona Spain ADeNu Research Group Artificial Intelligence Department Computer Science School UNED (Spanish National University of Distance Education) Spain aDeNu Research Group Computer Science School UNED

Active modeling is required in learning settings to cope with the dynamic evolution of the knowledge, since learners competences evolves over time as they participate in the course activities. Moreover, one of the main issues in a competence based eLearning process is to deliver personalized instructional designs adjusted to both 1) intrinsic characteristics of users (i.e. learning styles) and 2) the desired and achieved competences in the learning process (i.e. specific and generic competences). This delivery includes the adaptation of the content and the activities in a learning scenario based on a dynamic user model that evolves according to user interactions. In this paper, an approach to support Conditional Plans Generation (IMS Learning Designs) in the context of a virtual learning environment is presented. The process is supported by a pervasive usage of standards and specifications (IMS family of specifications) in conjunction with an integral user modeling.

关键词： Learning Artificial intelligence Process planning Monitoring Technology planning Design engineering Knowledge engineering systems engineering and theory Informatics Computer science

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Abstracts from the 2011 Joint Annual Meeting of the Society for Northwestern Vertebrate Biology and Washington Chapter of the Wildlife Society, Held at the Wesley Inn, Gig Harbor, Washington, March 23–25, 2011

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Northwestern Naturalist 2011年第2期92卷 136-166页

作者： Michael J. Adams Christopher A. Pearl Jessica Y. Adkins Daniel D. Roby Ladd Bayliss Peter J. Loschl Donald E. Lyons Yasuko Suzuki Hannah E. Anderson Sarah T. Hamman Keith B. Aubry Catherine M. Raley John J. Rohrer Eric C. Lofroth Scott H. Fitkin Michael L. Best Hartwell H. Welsh Jamie B. Bettaso Don T. Ashton Hartwell H. Welsh Scott McBain Lindsay M. Biga Andrew R. Blaustein Susan F. Brady R. Steven Wagner Daniel J. Selski James E. Johnson R. Bruce Bury Wynn W. Cudmore Hartwell H. Welsh Nathan D. Chelgren Tara Chestnut Chaucney W. Anderson Julie Kirshtein Megan T. Cook Tiffany S. Garcia Stephen Corn Erin Muths Amanda Kissel Rick Scherer Eric Delvin Jonathan D. Bakker Peter W. Dunwiddie Diana L. Dishman Deborah A. Duffield Harriet R. Huber Dyanna M. Lambourn Karen M. Dvornich Greg Falxa Gary M. Fellers Patrick M. Kleeman David Miller Brandon Fessler Jason T. Irwin Daniel D. Beck R. Steven Wagner Marc P. Hayes John A. Frew Christian E. Grue Chris R. Friesen Robert T. Mason Stevan J. Arnold Suzanne Estes Tiffany S. Garcia Katie M. Dugger Josh Johnson Mike Rochelle A. J. Kroll Stephanie S. Gervasi Caren S. Goldberg Dan Davis Erica Bree Rosenblum Bill Bosworth Lisette P. Waits Purnima Govindarajulu Gregory A. Green Steve Negri Jennifer R. Griffiths Daniel E. Schindler Christian E. Grue Karen M. Dvornich Adam G. Hansen David A. Beauchamp Casey M. Baldwin Marc P. Hayes Gretchen Padgett-Flohr Blake R. Hossack Winsor H. Lowe Paul Stephen Corn Aaron N. Johnston Kris Kendell Dave Prescott Scott Stevens Peter M. Kiffney Carol Volk Kerensa A. King Christian E. Grue James M. Grassley Andrew J. Kroll Matt Hane Josh Johnston Mike Rochelle Stuart Farber Niels Leuthold Michael J. Adams John P. Hayes Bo Li Michael T. Brett Kent B. Livezey Ilon E. Logan Teresa J. Lorenz Kimberly A. Sullivan Amanda V. Bakian Deanna Lynch Nancy Thomas Krysten Schuler Steven Jeffries Joshua Malt Kelly R. McAllister Joanne P. Schuett-Hames Aimee P. McIntyre Jay E. Jones Eric M. Lund Frithiof T. Waterstrat Jack N. Giovanini Stephen D. Duke Marc P. Hayes US Forest Service Pacific Northwest Research Station Olympia WA 98512 kaubry@fs.fed.us US Forest Service Okanogan-Wenatchee National Forest Methow Valley Ranger District Winthrop WA 98862 British Columbia Ministry of Environment Victoria BC V8W9M1 Washington Department of Fish and Wildlife Winthrop WA 98862 Humboldt State University 1 Harpst St. Arcata CA 95521 addsmike14@*** US Forest Service Pacific Southwest Research Station 1700 Bayside Dr. Arcata CA 95521 hwelsh@fs.fed.us US Fish and Wildlife Service Arcata Field Office 1655 Heindon Road Arcata CA 95521 jamie_bettaso@fws.gov Redwood Sciences Laboratory US Forest Service1700 Bayview Drive Arcata CA 99521 dashton@fs.fed.us hwelsh@fs.fed.us McBain &amp Trush 980 7th Street Arcata CA 95521 scott@*** Oregon State University Environmental Sciences Graduate Program Corvallis OR 97331 lindsay.biga@science.oregonstate.edu Oregon State University Department of Zoology Corvallis OR 97331 US Geological Survey Forest and Rangeland Ecosystem Science Center 3200 SW Jefferson Way Corvallis OR 97331 buryb@usgs.gov Life Science Department Chemeketa Community College Salem OR 97309 wynn.cudmore@chemeketa.edu US Forest Service Redwood Sciences Laboratory 1700 Bayview Drive Arcata CA 95521 hwelsh@fs.fed.us USGS Oregon Water Science Center 2130 SW 5th Avenue Portland OR 97207 chestnut@usgs.gov USGS Headquarters 12201 Sunrise Valley Drive Reston VA 20192 US Geological Survey Northern Rocky Mountain Science Center Aldo Leopold Wilderness Research Institute 790 E. Beckwith Avenue Missoula MT 59801 scorn@usgs.gov US Geological Survey Fort Collins Science Center 2150 Centre Avenue Building C Fort Collins CO 80526 Department of Biological Sciences Simon Fraser University Burnaby BC V5A 1S6 Colorado State University Department of Fishery and Wildlife Biology Fort Collins CO 80523 The Nature Conservancy 120 Union Ave SE Olympia WA 98501 edelvin@tnc.org School of Forest Resources University of Washington Seattle WA

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RESPONSIVENESS IMPROVEMENT OF IDLING SPEED CONTROL FOR AUTOMOTIVE

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38th International Conference on Computers and Industrial engineering

作者： Zhang, Yang Koorikawa, Takashi Kurihara, Nobuo Science Program in Mechanical System Engineering Hachinohe Institute of Technology School of Engineering Japan Hachinohe Institute of Technology School of Engineering Japan

ISBN: (纸本)9787121074370

Fuel economy is an important issue in the modern automotive industry. So fuel economy technologies are a research emphasis. Improving engine efficiency as a core of fuel saving technologies is under extensive study. Idle speed is the minimum operating speed of a combustion engine. The period of the idling operation occupies thirty percent of driving time for. urban traffic. Therefore significant fuel economy and emissions improvements can be gained by lowering the idle speed of an engine. In order to achieve a lower idle speed it is necessary to maintain a stable idle speed in the presence of known disturbances (e.g. air conditioning) and unknown disturbances. In this paper, idling speed was studied based on a four-cylinder gasoline engine model by three kinds of robust control methods, or PID control, Smith predictor and sliding mode control. A sliding mode controller was proposed, and accordingly a speed sliding surface was designed From the result of simulation, it was confirmed that control performance with load disturbance could be improved.

关键词： Idle speed control Robust control Sliding mode control Smith predictor Smith plus Compensation

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Low Fractal Dimension Cluster-Dilute Soot Aggregates from a Premixed Flame

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Physical Review Letters 2009年第23期102卷 235504-235504页

作者： Rajan K. Chakrabarty Hans Moosmüller W. Patrick Arnott Mark A. Garro Guoxun Tian Jay G. Slowik Eben S. Cross Jeong-Ho Han Paul Davidovits Timothy B. Onasch Douglas R. Worsnop Desert Research Institute Nevada System of Higher Education Reno Nevada 89512 USA Chemical Physics Program University of Nevada Reno Nevada 89557 USA Department of Physics University of Nevada Reno Nevada 89557 USA Division of Engineering and Applied Sciences Harvard University Cambridge Massachusetts 02138 USA Department of Chemistry University of Toronto Toronto Ontario M5S 3H6 Canada Department of Chemistry Boston College Chestnut Hill Massachusetts 02467 USA Aerodyne Research Inc. Billerica Massachusetts 01821 USA

Using a novel morphology segregation technique, we observed minority populations (≈3%) of submicron-sized, cluster-dilute fractal-like aggregates, formed in the soot-formation window (fuel-to-air equivalence ratio of 2.0–3.5) of a premixed flame, to have mass fractal dimensions between 1.2 and 1.51. Our observations disagree with previous observations of a universal mass fractal dimension of ≈1.8 for fractal-like aerosol aggregates formed in the dilute-limit via three-dimensional diffusion-limited cluster aggregation processes. A hypothesis is presented to explain this observation. Subject to verification of this hypothesis, it may be possible to control the fractal dimension and associated properties of aggregates in the cluster-dilute limit through application of a static electric field during the aggregation process.

关键词： Aggregates

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Wind tunnel testing of JSAE standard Low-aerodynamic-drag vehicle body using 1/5 scale model

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Review of Automotive engineering 2009年第1期30卷 51-60页

作者： Shimano, Kenjiro Kumano, Takahiro Takagi, Michitoshi Ono, Kenji Horinouchi, Nariaki Tarumi, Seiji Department of Mechanical Systems Engineering Faculty of Engineering Musashi Institute of Technology 1-28-1 Tamazutsumi Setagaya Tokyo 158-8557 Japan Layout Group Automobile Platform Design Department Suzuki Motor Corporation 300 Takatsuka-cho Minami-ku Hamamatsu-shi Shizuoka 432-8611 Japan Department of Prime Mover Engineering School of Engineering Tokai University 1117 Kitakaname Hiratsuka-shi Kanagawa 259-1292 Japan VCAD System Research Program RIKEN 2-1 Hirosawa Wako Saitama 351-0198 Japan Heat Transfer and Fluid Flow Laboratory Toyota Central R and D Labs. Inc. Nagakute Aichi 480-1192 Japan CAE Testing Division Yamaha Motor Co. Ltd. 2500 Shingai Iwata-shi Shizuoka 438-8501 Japan

As computational fluid dynamics plays a crucial role in vehicle body design, the CFD committee, one of the technical committees comprising JSAE, embarked on a benchmark project in which a number of CFD codes would be tested on the same vehicle body. A wind tunnel test of the 1/5 scale model was conducted to provide reference data for the benchmark test. In this paper, details of the measurements are presented. On the body surface, smooth flow patterns were visualised by tufting. It was also found that total pressure loss in the wake of the model displayed a unique pattern similar to a mushroom cloud. © 2009 Society of Automotive Engineers of Japan, Inc. All rights reserved.

关键词： Computational fluid dynamics

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Virtual instrumentation interfaces for real-time control and display of electric machine drives

Virtual instrumentation interfaces for real-time control and...

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2008 ASEE Annual Conference and Exposition

作者： Sundaram, Ramakrishnan Mak, Fong Tandle, Sunil Gannon University Department of Electrical and Computer Engineering Gannon University Gannon/GE Transportation Embedded System Graduate Program

No abstract available

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An executable system architecture approach to discrete events system modeling using SysML in conjunction with Colored Petri Net

An executable system architecture approach to discrete event...

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2008 IEEE International systems Conference Proceedings, SysCon 2008

作者： Wang, Renzhong Dagli, Cihan H. System Engineering Graduate Program Missouri University of Science and Technology 600 W 14th Street Rolla MO 65409-0370 United States

ISBN: (纸本)9781424421503

This paper proposes an executable system architecting paradigm for discrete event system modeling and analysis through integration of a set of architecting tools, executable modeling tools, analytical tools, and visualization tools. The essential step is translating SysML-based specifications into Colored Petri Nets (CPNs) which enables rigorous static and dynamic system analysis as well as formal verification of the behavior and functionality of the SysML-based design. A set of tools have been studied and integrated that enable a structured architecture design process. Some basic principles of executable system architecture for discrete event system modeling that guide the process of executable architecture specification and analysis are discussed. This paradigm is aimed at general system design. Its feasibility was demonstrated with a C4type network centric system as an example. The simulation results was used to check the overall integrity and internal consistency of the architecture models, refine the architecture design, and, finally, verify the behavior and functionality of the system being modeled. ©2008 IEEE.

关键词： Discrete event simulation

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R & D of ray tracing simulation software and fabrication technologies based on VCAD (Volume-CAD) concept for GRIN lens

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Key engineering Materials 2008年 381-382卷 109-112页

作者： Itani, N. Watanabe, Y. Lin, W. Uehara, Y. Morita, S. Mishima, T. Ohmori, H. Makinouchi, A. Graduate School of Science and Engineering Saitama University 255 Shimo-Okubo Sakura-ku Saitama City Saitama 338-8570 Japan VCAD System Research Program CIPS RIKEN 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan

We have been developing an intellectual manufacturing process applying IT (V-Cam system fabrication processes) based on Volume-CAD (VCAD) system which can express internal information of materials. This paper introduces the ultra-precision grinding, ray tracing (optical path) simulation software 'V-Opt' and the measurement of actual optical functions in the development of optical element taking gradient refractive index (GRIN) lens with functionally graded material properties as a model. In finish ground GRIN lens using SD#8000 wheel, the P-V (Peek to Value) of 27.07 nm, surface roughness (Ra) of 1.83 nm is obtained. 'V-Opt' developed for GRIN lens have two main functions;one is the visualizations of ray tracing and the other is the evaluation of spot diagram and focal length.

关键词： Grinding (machining)

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