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The role of dissipation on wave shape and attenuation in granular chains

Physics Procedia 2010年第1期3卷 465-471页

作者： Eric B. Herbold Vitali F. Nesterenko School of Materials Science and Engineering Georgia Institute of Technology Love Manufacturing Building 771 Ferst Drive Atlanta Georgia 30332 USA Department of Mechanical and Aerospace Engineering University of California at San Diego La Jolla CA 92093-0411 USA Materials Science and Engineering Program University of California at San Diego La Jolla CA 92093 0418 USA

The role of dissipation on wave shape and attenuation in dry and saturated granular chains is considered experimentally and numerically. The wave dynamics in these chains includes a dissipative term based on Stoke’s drag and on a new mechanism of liquid expulsion from the developing elastic contact. The latter mechanism will be shown to be necessary for comparisons of experimental and numerical results. The dissipation of energy in the region of particle contact may serve as a model for hot-spot formation in granular materials undergoing high strain-rate deformation. The shock wave profiles in granular chains, including viscous dissipation, were analytically obtained with the long wave approximation. The critical viscosity, which describes the transition from and oscillatory to a monotonous wave profile is validated using a comparison of the analytical and discrete numerical models, which agree well with one another.

关键词： Dissipation Strongly nonlinear waves Viscous dissipation Waves Hertz law

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Periodic waves in a Hertzian chain

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Physics Procedia 2010年第1期3卷 457-463页

作者： Vitali F. Nesterenko Eric B. Herbold Department of Mechanical and Aerospace Engineering University of California at San Diego La Jolla CA 92093-0411 USA Materials Science and Engineering Program University of California at San Diego La Jolla CA 92093 0418 USA School of Materials Science and Engineering Georgia Institute of Technology Love Manufacturing Building 771 Ferst Drive Atlanta Georgia 30332 USA

Strongly nonlinear periodic waves are investigated in an initially compressed chain of spheres under Hertz contact. A harmonic excitation force disturbs the first grain with an amplitude comparable to the initial compression and the steady strain-wave profiles at large distances from this disturbance are compared with predictions from the long wave approximation. Two qualitatively different types of quasi-stationary periodic waves are apparent in the system: one with minimum and maximum strain values above the static value and one whose minimum strain is below and maximum value is above the initial strain. From the frequency spectrums of the calculated force between particles, new forcing functions are constructed that allow rapid formation of quasi-stationary strongly nonlinear periodic waves.

关键词： Strongly nonlinear Periodic waves Hertzian chain

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Analysis and prototyping of a new variable-wheelbase bike

Analysis and prototyping of a new variable-wheelbase bike

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25th World Battery, Hybrid and Fuel Cell Electric Vehicle Symposium and Exhibition: Sustainable Mobility Revolution, EVS 2010

作者： Huang, Yu-Che Shyu, Jenq-Huey Chang, Shyue-Bin Chen, Yang-Tong Tu, Jui-Che Graduate School of Design-Doctoral Program R and D Center National Yunlin University of Science and Technology 17 37. Rd 407 Taichung Taiwan Department of Mechanical Engineering National Taipei University of Technology Zhongxiao E. Rd. Da-An District Taipei City 106 Taiwan College of Mechatronic Engine KAO YUAN UNIVERSITY No.1821 Jhongshan Rd. Lujhu Township Kaohsiung County 821 Taiwan TInstitute of Manufacturing Technology National Taipei University of Technology Zhongxiao E. Rd. Da-An District Taipei City 106 Taiwan Graduate School of Design-Doctoral Program National Yunlin University of Science and Technology Section 3. Douliu 640 Taiwan

This research is about the analysis and design of variable-wheelbase bike. Aiming to the existing folding bike of all kinds, we collect patent communiqué and record information to classify the documents and give analysis of its merit and defect. We find the way of innovative design from the generalizing information. Finally, we choose multiple-linkage mechanism system to change the positions of seat, handle bar and rear wheel, which can also alter the riding position and control ability of user. In order to lower the cost, we reduce the numbers of linkages. This linkages system must be one freedom . Therefore, this research is proceeding the mechanical sustainable synthesizing with this design iuput, and develops a multiple-linkages mechanism system with 8 bares, 10 joints with one freedom to be the construction of bike frame. Then, we synthesizing the dimensions of bike frame by SolidWorks,and stimulating sporting motion and interference by the 3D CAD model, later, evaluate whether the 3D dummy meets the requirements or not. It will also make the CAE to proceed the stress analysis of the bike frame construction with ANSYS11. 0 to make sure the strength and security. Finally, may be we would make a prototype.

关键词： Stress analysis

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Low price guarantee in inventory systems coordinated with pricing strategy

Low price guarantee in inventory systems coordinated with pr...

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2010 IEEE International Conference on Service Operations and Logistics, and Informatics, SOLI 2010

作者： Peng, Ying Dong, Ming Han, Guanghua Department of Industrial Engineering Manageaent School of Mechanical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China Department of Operations Management Antai College of Economics and Management Shanghai Jiao Tong University FaHua Zhen Rd. Shanghai 200052 China Leaders for Manufacturing Program Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 United States Sino-US Global Logistics Institute Shanghai Jiao Tong University 1954 Huashan Road Shanghai 200030 China

ISBN: (纸本)9781424471188

We analyze a finite horizon, single-product, periodic review model in which pricing and inventory decisions should be made simultaneously at the beginning of each period. Besids the traditional cost such as order cost, inventory cost, there IS a new introduced cost called the reimbursement cost. Customers are ensured to be reimbursed the difference between the current purchase price and any lower price within a fixed future time limit. The price has a direct impact on the distribution of the demand and the expected demand is a non-increase function of the price. The model is formulated as a discrete-time optimal control problem. Its objective is to maximize expected revenue over the planning horizon. The existence of its optimal solution has been proved based on the (s, S, p) policy. © 2010 IEEE.

关键词： Costs

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Enhancements to a retention program for women engineering technology students by the addition of a social support network and community building activities

Enhancements to a retention program for women engineering te...

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2009 ASEE Annual Conference and Exposition

作者： Dell, Elizabeth Christman, Jeanne Wolcott, Teresa Valentine, Maureen Department of Manufacturing and Mechanical Engineering Technology Rochester Institute of Technology United States Department of Electrical Computer and Telecommunications Engineering Technology Rochester Institute of Technology United States Department of Computer Engineering Technology Program WIT in the Civil Engineering Technology program RIT South Africa College of Applied Science and Technology Rochester Institute of Technology United States

This paper describes a low-cost, successful program to help retain female engineering technology students with the ultimate goal of increasing the number of female graduates of our engineering technology programs. This program was started in 2003. The programming initially focused on academic support in the form of tutoring, formation of study groups and reimbursement for academic laboratory kits. This program did improve retention, but a survey of our students found that they also desired social support and opportunities to serve the community. Since the addition of programming involving social support and community building, retention of women students in the engineering technology programs has improved by an average of 6% per year. In addition to improved retention, the number of students receiving a D, F or Withdrawing from the core first- and second-year courses in these programs has dropped by over 75%. © American Society for engineering Education, 2009.

关键词： Students

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Biology-inspired sensor design

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IEEE Potentials 2009年第6期28卷 19-24页

作者： Stroble, Jacquelyn K. Watkins, Steve Stone, Robert American Institute of Physics Discoveries Breakthroughs Inside Science Program United States Department of Electrical and Computer Engineering Applied Optics Laboratory Missouri University of Science and Technology United States Mechanical Industrial and Manufacturing Engineering Department Oregon State University United States

Biology has played a key role in influencing the development and optimization of a significant variety of sensors that provide engineers new ideas for improvements to current technology, new sensor technology, and potential sensor miniaturization. Biological systems, such as plants and insects offer significant methods of flight, imaging, sensing, adaptation to environment, and locomotion. The biological domain provides inspiration at many levels, such as cellular, organism, and species. A biological system is any biological organism, organism subsystem, or portion of an organism that is observed to exist. Abstraction of the biological system using analogical reasoning allows an engineering designer to look for a specific solution through mimicry in an approach to biology-inspired design. The analogous approach relies on the idea of figuring out the basis of overall biological system and of each part or subsystem that achieves the overall goal.

关键词： Biological systems

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PRACTICAL EVALUATION FOR LONG-TERM STABILITY OF THERMAL INTERFACE MATERIAL

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EXPERIMENTAL TECHNIQUES 2009年第1期33卷 28-32页

作者： Chen, C. I. Ni, C. Y. Pan, H. Y. Chang, C. M. Liu, D. S. C.I. Chen (e1587154@***) is affiliated with the Department of Mechanical Engineering Chung-Hua University Taiwan Republic of China C.Y. Ni is affiliated with the Department of Advanced Assembly Technology Integration H.Y. Pan is affiliated with the Modeling and Reliability Program Taiwan Semiconductor Manufacturing Company Taiwan Republic of China C.M. Chang and D.S. Liu are affiliated with the Department of Mechanical Engineering National Chung Cheng University Taiwan Republic of China.

The article focuses on the long-term stability of thermal interface material (TIM). It states that an accelerated reliability test method was used to evaluate the long-term stability of TIM in order to provide sufficient thermal conductance in extended or extensive use condition. It tells that the degradation in TIM performance depends on the time of usage, material properties, and operation temperature. It also notes that a gel-type TIM was adopted to conduct an example of stability experiment while failure mechanism and material analysis were presented to reveal the various reliability stresses.

关键词： THERMAL interface materials ACCELERATED life testing THERMAL conductivity STABILITY (Mechanics) ENERGY dissipation STRAINS & stresses (Mechanics) ELECTRICAL engineering -- Materials

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THICKNESS DETERMINATION OF A PLATE WITH VARYING THICKNESS USING AN ARTIFICIAL NEURAL NETWORK FOR TIME‐FREQUENCY REPRESENTATION OF LAMB WAVES

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AIP Conference Proceedings 2009年第1期1096卷 619-626页

作者： C. Treesatayapun A. Baltazar A. Balvantin J.‐Y. Kim aRobotics and Advanced Manufacturing Program CINVESTAV Unidad‐Saltillo Ramos Arizpe Coahuila 25900 México bGWW School of Mechanical Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA

Thickness estimation of a varying‐thickness media is carried out using an algorithm acting as an artificial neural network for time‐frequency representation (TFR) of Lamb waves. Dispersion curves are reconstructed using a self adjustable network multi‐input fuzzy rules emulated network (MIFREN). The uncertainty in the time‐frequency determination is compared with a typical spectrogram technique. The proposed algorithm is computationally less complex than others used in the past. Experimental results were obtained by exciting Lamb waves on an aluminum plate with varying thickness; these were compared with numerical estimations.

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Ensuring a strong U.S. engineering workforce for technology innovation and competitiveness: A partnership between academia and industry

Ensuring a strong U.S. engineering workforce for technology ...

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2008 ASEE Annual Conference and Exposition

作者： Keating, Donald Stanford, Thomas Rencis, Joseph J. Deloatch, Eugene Noori, Mohammad Sullivan, Edward Woodall, David Egbert, Norman Quick, David Olson, Roger Truesdale, Samuel McHenry, Albert Lindquist, Timothy Tidwell, Joseph Palmer, Harvey Smith, Mark Dunlap, Duane Schuver, Mark Segner, Edmund Farbrother, Barry Tricamo, Stephen Burbank, Ken Purdy, Carla Holmes, Randall University of South Carolina Department of Mechanical Engineering College of Engineering University of South Carolina Graduate Studies Division National Collaborative Task Force Department of Chemical Engineering University of South Carolina University of Arkansas Department of Mechanical Engineering University of Arkansas Morgan State University School of Engineering Morgan State University American Society of Engineering Education North Carolina State University College of Engineering California State Polytechnic University California Polytechnic State University Department of Civil Engineering College of Engineering California State Polytechnic University Oregon Institute of Technology Engineering Research Council Rolls-Royce Corporation Engineering and Technology Rolls-Royce Corporation R and D Customer Requirements R and T Strategy Rolls-Royce North American Technologies College Industry Partnership Division American Society for Engineering Education Employee Development Engineering Business Improvement Organization Rolls-Royce Corporation Arizona State University Arizona State University Polytechnic College of Technology and Innovation Arizona State University Polytechnic Joint Alliance of Companies Managing Education for Technology JACMET Rochester Institute of Technology Kate Gleason College of Engineering Rochester Institute of Technology Product Development and Manufacturing Leadership Program Kate Gleason College of Engineering Rochester Institute of Technology Purdue University College of Technology Purdue University Graduate Studies Division American Society for Engineering Education University of Alabama Birmingham United States Department of Civil Engineering University of Alabama Birmingham United States University of New Haven Tagliatela College of Engineering University of New Haven New Jersey Institute of Technology Department of Industrial and Manufacturing Engineering Western Carolina University Department of Engineering and Technology Western Carolina University Un

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Synthesis and characterization of biomimicked structural composites

Synthesis and characterization of biomimicked structural com...

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114th Annual ASEE Conference and Exposition, 2007

作者： Allameh, Seyed Ogonek, Tom Cooper, Paul Northern Kentucky University United States Mechanical and Manufacturing Engineering Technology of the Physics Department Northern Kentucky University United States Department of Technology Department of Construction Management Northern Kentucky University United States Construction Technology/Management Program Northern Kentucky University United States

This paper presents the preliminary results of experiments conducted on the toughening of structural composites for shatter-proof applications. Layered composites inspired by tough biological structures such as nacre were fabricated and tested in tension and compression. The results are compared with monolithic structures fabricated and tested under the same conditions. Compared to monolithic samples, mechanical testing results show greater toughness associated with higher levels of ductility for the layered composites. The effect of materials selection for structural composites was investigated. It was concluded that biomimicked structures can be designed and fabricated with both higher levels of tensile strength as well as increased ductility (resulting in higher fracture toughness). The educational implications of this work in terms of the students participation and its usefulness in the outreach programs are discussed. © American Society for engineering Education, 2007.

关键词： Composite materials

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