检索结果-内蒙古大学图书馆

IEEE Control systems 2010年第4期30卷 18-23页

作者： Ufuk Topcu Andy Packard Peter Seiler Gary Balas Mechanical Engineering Department University of California Berkeley USA California Institute of Technology USA Aerospace Engineering and Mechanics Control Science and Dynamical Systems program University of Minnesota USA Aerospace Engineering and Mechanics Department University of Minnesota USA Research and Development Honeywell International Inc. USA

In this issue of IEEE Control systems Magazine, Andy Packard and friends respond to a query on determining the region of attraction using sum-of-squares methods.

关键词： Polynomials Symmetric matrices Convergence Yield estimation Control theory Matrix decomposition

来源：评论

学校读者我要写书评

暂无评论

Accelerating the Shuffled Frog Leaping algorithm by parallel implementations in FPGAs

Accelerating the Shuffled Frog Leaping algorithm by parallel...

引用

International Conference on Bio-Inspired Computing: Theories and Applications, BICTA

作者： Daniel M. Muñoz Carlos H. Llanos Leandro dos S. Coelho Mauricio Ayala-Rincón Department of Mechanical Engineering University of Brasilia Brasilia D.F Brazil Industrial and Systems Engineering Graduate Program Pontifical Catholic University of Parana Curitiba Parana Brazil Department of Computer Science and Mathematics University of Brasilia Brasilia D.F Brazil

Meta-heuristics are efficient techniques for solving large scale optimization problems in which traditional mathematical techniques are impractical or provide suboptimal solutions. The Shuffled Frog Leaping algorithm (SFLA) is a stochastic iterative method, bio-inspired on the memetic evolution of a group of frogs when seeking for food, which combines the social behavior-based of the particle swarm optimization technique (PSO) and the global information exchange of memetic algorithms. However, the SFLA algorithm suffers on large execution times, being this problem clearly evident when solving complex optimization problems for embedded applications. This drawback can be overcome by exploiting the parallel capabilities of the SFLA. This paper proposes a hardware parallel implementation of the SFLA algorithm (HPSFLA) using FPGAs (Field programmable gate Arrays) and the efficient floating-point arithmetic. The proposed architecture allows the SFLA to improve the functionality of the algorithm as well as to decrease the execution times by implementing parallel frogs and parallel memeplexes. Three well-known benchmark problems have been used to validate the implemented algorithm and simulation results demonstrate that the HPSFLA speeds-up by factors of 362, 727 and 211 a C-code implementation using an embedded microprocessor for the Sphere, Rastrigin and Rosenbrock benchmarks problems, respectively. Synthesis, simulation and execution time results demonstrate the effectiveness of the proposed HPSFLA architecture for embedded optimization systems.

关键词： Mathematics Field programmable gate arrays Table lookup

来源：评论

学校读者我要写书评

暂无评论

Corrosion resistant zirconia coated carbonyl iron particle-based magnetorheological fluid

Corrosion resistant zirconia coated carbonyl iron particle-b...

引用

Optical Fabrication and Testing, OFT 2010

作者： Shafrir, Shai N. Romanofsky, Henry J. Skarlinski, Michael Wang, Mimi Miao, Chunlin Salzman, Sivan Chartier, Taylor Mici, Joni Lambropoulos, John C. Shen, Rui Yang, Hong Jacobs, Stephen D. OptiPro Systems 6368 Dean Parkway Ontario NY 14519 United States Department of Mechanical Engineering University of Rochester Rochester NY 240 East River Road Rochester NY 14623 United States Laboratory for Laser Energetics University of Rochester Rochester NY 240 East River Road Rochester NY 14623 United States Department of Chemical Engineering University of Rochester Rochester NY 240 East River Road Rochester NY 14623 United States Materials Science Program Department of Mechanical Engineering University of Rochester Rochester NY 240 East River Road Rochester NY 14623 United States

Zirconia coated carbonyl iron particle-based magnetorheological fluid was developed for magnetorheological finishing. Particles were coated via sol-gel synthesis. Spot polishing tests were performed over 3 weeks with ... 详细信息

ISBN: (纸本)9781557528933

关键词： Iron

来源：评论

学校读者我要写书评

暂无评论

Effect of resin impregnation on mechanical properties of rice hull silica carbon

引用

International Journal of the Society of Material Engineering for Resources 2010年第2期17卷 173-176页

作者： Asano, Jun Kimura, Mitsuhiro Takahashi, Takeshi Iizuka, Hiroshi Master's Program of Mechanical Systems Engineering Graduate School of Science and Engineering Yamagata University Jonan 4-3-16 Yonezawa 992-8510 Japan Sanwa Yushi Co. Ltd. Ichinichi-cho 4-1-2 Tendo 994-0044 Japan Faculty of Engineering Yamagata University Jonan 4-3-16 Yonezawa 992-8510 Japan

New utilization of rice hull, which is one of the agricultural by-products in Japan, is required to use as an industrial resource from a viewpoint of recycling. The rice hull silica carbon (RHS carbon) material is manufactured by mixing and impregnating the rice hull with a phenol resin, and then carbonizing in a nitrogen gas atmosphere at high temperatures. The RHS carbon has the natural porous structure that is originated from the natural structure of the rice hull. Since the RHS carbon has excellent frictional properties, it is expected to use as a friction element in a linear motion slider. However, the mechanical properties of the RHS carbon were dispersed largely, and were strongly affected by the making process. In this study, the authors discussed the effects of the impregnation rates of the phenol resin, and obtained the optimal impregnation rate to achieve the low dispersion in the mechanical properties. Moreover, the effect of the molding method on the mechanical properties was evaluated by some mechanical tests. © 2010 Soc. Mater. Eng. Resour.

关键词： Carbon

来源：评论

学校读者我要写书评

暂无评论

Responsiveness Improvement of Idling Speed Control for Automotive Using SMC

引用

Journal of Software Engineering and Applications 2009年第5期2卷 309-315页

作者： Yang ZHANG Nobuo KURIHARA Hiroyuki YAMAGUCHI Doctor of Science Program in Mechanical Systems Hachinohe Institute of Technology Graduate School of Engineering Hachinohe Institute of Technology Department of System and Information Hachinohe Institute of Technology

To improve the responsiveness of engine speed control to disturbances, robust controls were investigated by simulation. The intake air control system of a gasoline engine is a typical nonlinear system, and the disturbances and parameter perturbations are generally regarded as being the unstable factors with regard to engine control. In this paper, a Mean-Value Engine Model (MVEM) with disturbances and parameter perturbations is investigated using Sliding Mode Control (SMC), which is a form of variable structure control, with a view to address instability in the idle speed control process. The simulation results confirmed that, compared with a conventional PI (Proportional-Integral) controller, the stability of the idle speed for an engine that is being subjected to disturbances, parameter variations and background noise is greatly improved by the application of SMC.

关键词： Gasoline Engine Intake Air Control Sliding Mode Control Simulation

来源：评论

学校读者我要写书评

暂无评论

Hardware Architecture for Particle Swarm Optimization Using Floating-Point Arithmetic

Hardware Architecture for Particle Swarm Optimization Using ...

引用

International Conference on Intelligent systems Design and Applications (ISDA)

作者： Daniel M. Muñoz Arboleda Carlos H. Llanos Leandro dos_S. Coelho Mauricio Ayala-Rincón Department of Mechanical Engineering University of Brasilia Brasília Brazil Industrial and Systems Engineering Graduate Program Pontificial Catholic University of Paraná Curitiba Brazil Departments of Computer Science and Mathematics University of Brasilia Brasília Brazil

High computational cost for solving large engineering optimization problems point out the design of parallel optimization algorithms. Population based optimization algorithms provide parallel capabilities that can be explored by their implementations done directly in hardware. This paper presents a hardware implementation of particle swarm optimization algorithms using an efficient floating-point arithmetic which performs the computations with high precision. All the architectures are parameterizable by bit-width, allowing the designer to choose the suitable format according to the requirements of the optimization problem. Synthesis and simulation results demonstrate that the proposed architecture achieves satisfactory results obtaining a better performance in therms of elapsed time than conventional software implementations.

关键词： Hardware Particle swarm optimization Floating-point arithmetic Computer architecture Design optimization Computational efficiency Design engineering Algorithm design and analysis High performance computing Computational modeling

来源：评论

学校读者我要写书评

暂无评论

Zirconia coated carbonyl iron particle-based magnetorheological fluid for polishing

Zirconia coated carbonyl iron particle-based magnetorheologi...

引用

Optical Manufacturing and Testing VIII

作者： Shafrir, Shai N. Romanofsky, Henry J. Skarlinski, Michael Wang, Mimi Miao, Chunlin Salzman, Sivan Chartier, Taylor Mici, Joni Lambropoulos, John C. Shen, Rui Yang, Hong Jacobs, Stephen D. OptiPro Systems 6368 Dean Parkway Ontario NY United States Department of Mechanical Engineering University of Rochester Rochester NY United States Laboratory for Laser Energetics University of Rochester Rochester NY United States Department of Chemical Engineering University of Rochester Rochester NY United States Materials Science Program University of Rochester Rochester NY United States Institute of Optics University of Rochester 240 East River Road Rochester NY 14623 United States

ISBN: (纸本)9780819477163

Aqueous magnetorheological (MR) polishing fluids used in magnetorheological finishing (MRF) have a high solids concentration consisting of magnetic carbonyl iron particles and nonmagnetic polishing abrasives. The properties of MR polishing fluids are affected over time by corrosion of CI particles. Here we report on MRF spotting experiments performed on optical glasses using a zirconia coated carbonyl iron (CI) particle-based MR fluid. The zirconia coated magnetic CI particles were prepared via sol-gel synthesis in kg quantities. The coating layer was ˜50-100 nm thick, faceted in surface structure, and well adhered. Coated particles showed long term stability against aqueous corrosion. "Free" nano-crystalline zirconia polishing abrasives were co-generated in the coating process, resulting in an abrasivecharged powder for MRF. A viable MR fluid was prepared simply by adding water. Spot polishing tests were performed on a variety of optical glasses over a period of 3 weeks with no signs of MR fluid degradation or corrosion. Stable material removal rates and smooth surfaces inside spots were obtained. © 2009 SPIE.

关键词： Magnetorheological fluids

来源：评论

学校读者我要写书评

暂无评论

A new approach to measure melamine, cyanuric acid, and melamine cyanurate using surface enhanced Raman spectroscopy coupled with gold nanosubstrates

引用

Sensing and Instrumentation for Food Quality and Safety 2008年第1期2卷 66-71页

作者： He, Lili Liu, Yang Lin, Mengshi Awika, Joseph Ledoux, David R. Li, Hao Mustapha, Azlin Food Science Program Division of Food Systems and Bioengineering University of Missouri Columbia MO 65211 United States Department of Animal Sciences University of Missouri Columbia MO 65211 United States Department of Mechanical and Aerospace Engineering University of Missouri Columbia MO 65211 United States

Vibrational spectroscopic characteristics of melamine, cyanuric acid, and melamine cyanurate were measured using surface-enhanced Raman spectroscopy (SERS) coupled with gold nanosubstrates. Trace amounts of melamine and its analogues (cyanuric acid and melamine cyanurate) were characterized and quantified quickly and accurately by SERS in combination with partial least squares (PLS) analysis. Based on the relationship between the Raman intensity of the most prominent peak at around 676 cm-1 and log values of melamine concentrations, the limit of detection (LOD) of SERS for melamine was estimated to be 2.6 × 10-7 mol L-1 (∼33 ppb). An approximately 3 × 104 fold of enhancement factor for SERS signals of melamine on gold nanosubstrates was obtained. This result was based upon the comparison of the peak at around 676 cm-1 in the SERS spectra with that of normal Raman spectra of melamine in aqueous solutions. SERS spectra of cyanuric acid acquired from its solid form differ significantly from this compound in an aqueous solution, indicating a possible keto-enol isomerization reaction of cyanuric acid in water. When equal amounts of melamine and cyanuric acid were added together, spoke-like crystals of melamine cyanurate formed instantly, which could be measured and characterized by SERS. This study demonstrates that SERS could provide a fast and ultra-sensitive tool for detection and characterization of melamine and its derivative compounds in aqueous solutions. © Springer science+Business Media, LLC 2008.

关键词： Melamine

来源：评论

学校读者我要写书评

暂无评论

Annual business and news:: Beginning the 31st year of the Journal of Guidance, Control, and Dynamics

引用

JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 2008年第1期31卷 1-1页

作者： Schmidt, George T. Aeronautics and Astronautics Massachusetts Institute of Technology (MIT) AIAA Institute of Electrical and Electronics Engineers Russian Federation Academy of Navigation and Motion Control Department of Mechanical and Aerospace Engineering and Engineering Mechanics University of Missouri-Rolla(UMR) Lockheed Electronics Company Center for Space Research University of Texas Austin United States Wright Laboratory Eglin Air Force Base UMR AIAA Guidance Navigation and Control Technical Committee American Automatic Control Council Lockheed Martin Aeronautics Company Palmdale CA United States C4ISR and Unmanned Air Vehicle (UAV) Programs for Air Vehicle Sciences and Systems Accreditation Board Engineering and Technology Inc./Aeronautical National Technical Committee on Guidance Navigation and Control Department of Mechanical and Aerospace Engineering University at Buffalo State University of New York (SUNY) AIAA Technical Committee on GN and C Air Vehicles Directorate Air Force Research Laboratory (AFRL) Wright-Patterson Air Force Base Space Access and Hypersonic Vehicle Guidance and Control Group Control Science Center of Excellence AFRL AIAA Technical Committee on Guidance Navigation and Control Department of Mechanical and Aeronautical Engineering University of California (UC) Davis United States Boeing Company Modernized Flight Control System for the Apache Longbow AIAA Institute of Electrical and Electronics Engineers AHS Jet Propulsion Laboratory California Institute of Technology Boeing Company Flight Sciences and Advanced Design Group Guidance Navigation and Control (GN and C) Systems Engineer Distributed Space Systems NASA Goddard Space Flight Center (GSFC) AIAA GN and C Technical Committee Department of Aerospace Engineering and Engineering Mechanics University of Texas Austin United States Institute of Navigation American Astronautical Society AIAA Guidance Navigation (GN and C) and Control Technical Committee Department of Aerospace Engineering Iowa State University Iowa

来源：评论

学校读者我要写书评

暂无评论

PRESIDENT'S PAGE

引用

Naval Engineers Journal 2009年第6期109卷

作者： Joseph F. Yurso President Joseph F. Yurso:is currently director of technical development for Q.E.D. Systems Inc. He received a Bachelors of Science in mechanical engineering from The Pennsylvania State University and an Masters of Science in mechanical engineering from the Naval Postgraduate School. He also completed a special management program at Carnegie Mellon University. Prior to entering the Navy as an engineering duty officer Mr. Yurso was a refrigeration and air conditioning engineer for the Bureau of Ships. His Navy experience includes engineer officer of a combatant ship submarine type desk quality assurance officer and production officer in naval shipyards and planning officer quality assurance officer and deputy supervisor in Supervisor of Shipbuilding offices. His two command tours were as Supervisor of Shipbuilding Groton Connecticut (1980-81) and Shipyard Commander Portsmouth Naval Shipyard Kittery Maine (1981-84). He was awarded the Legion of Merit for both of these tours. Mr. Yurso has been a member of ASNE since 1964. He is a life member and a sustaining member of the Society. He has been active in several Sections including Charleston Northern and Southern New England and Tidewater. He is a former chairman of the Tidewater Section and was the chairman of the ASNE Fleet Maintenance Symposium in 1991. He served as Council vice president from 1993 to 1996 and as a member of Council for six years. He was a contributing author to the Society's first edition of Naval Engineering and American Sea Power. In 1993 he was awarded the Frank G. Law Award for his dedication and longtime service to the Society. Mr. Yurso maintains memberships in other societies including the American Society of Mechanical Engineers Sigma Xi the American Society for Quality Control Naval Institute and Tidewater Association of Service Contractors. He has held registered professional engineer status in two states and is listed inWho's Who in Science and Engineering.

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：