Mechanical Engineering Research Works
Permanent URI for this collectionhttp://hdl.handle.net/1903/1661
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Item From Science to Seapower: A Roadmap for S&T Revitalization(CALCE EPSC Press, University of Maryland, College Park, MD, 2006, 2006) Kavetsky, Robert; Marshall, Michael; Anand, DavinderItem The Legacy of Taylor, Gantt, and Johnson: How to Improve Production Scheduling(2007-12) Herrmann, Jeffrey W.The challenge of improving production scheduling has inspired many different approaches. This paper examines the key contributions of three individuals who improved production scheduling: Frederick Taylor, who defined the key planning functions and created a planning office; Henry Gantt, who provided useful charts to improve scheduling decision-making, and S.M. Johnson, who initiated the mathematical analysis of production scheduling problems. The paper presents an integrative strategy to improve production scheduling that synthesizes these complementary approaches. Finally, the paper discusses the soundness of this approach and its implications on OR research, education, and practice.Item Training in Virtual Environments: A Safe, Cost Effective, and Engaging Approach to Training(CALCE EPSC Press, University of Maryland, College Park, MD, 2008, 2008) Gupta, Satyandra; Anand, Davinder; Brough, John; Schwartz, Maxim; Kavetsky, RobertItem Overview of Geometry Based Indexing and Search Tool(2008-12) Gupta, Satyandra K.Item Characterization and control of plastic deformation in premolded components in in-mold assembled mesoscale revolute joints using bi-directional filling strategy(2008-12) Ananthanarayanan, Arvind; Gupta, Satyandra K.; Bruck, HughItem Overview of Multi-Piece Mold Design Research at the Advanced Manufacturing Lab(2008-12) Gupta, Satyandra KItem Energetics: Science and Technology in China(CALCE EPSC Press, University of Maryland, College Park, MD, 2010, 2010) Short, James; Kavetsky, Robert; Pecht, Michael; Anand, DavinderItem From Science to Seapower: A Roadmap for S&T Revitalization Postscript 2010(CALCE EPSC Press, University of Maryland, College Park, MD, 2010, 2010) Kavetsky, Robert; Marshall, Michael; Anand, DavinderItem Towards a New Manufacturing Approach to Realizing Bio-Inspired Robots with Mesoscale Features(2010-12) Gupta, Satyandra K.Item Simulation-Based Innovation and Discovery: Energetics Applications(CALCE EPSC Press, University of Maryland, College Park, MD, 2011, 2011) Anand, Davinder; Gupta, Satyandra; Kavetsky, RobertItem Simulation-Based Design of Drive Mechanism for Flapping Wing Miniature Air Vehicles(CALCE EPSC Press, 2011) Ananthanarayanan, Arvind; Bejgerowski, W; Gerdes, J; Mueller, D; Gupta, Satyandra; Wilkerson, SFlapping wing miniature air vehicles (MAVs) have significant potential in surveillance, search, rescue and reconnaissance applications. These applications require the MAV to carry payloads in the form of batteries, on-board cameras, camera, sensors etc. In order to ensure that the payload capacity of the MAV is maximized for a given wing area and flapping frequency, we need to carefully design the drive mechanism to reduce its mass and ensure that it meets the intended functional requirements. The overall design approach described in this chapter incorporates the advances in modeling and simulations methods in kinematic and dynamic analysis, finite element analysis, and manufacturability analysis. We demonstrate applicability this design approach using two case studies.Item Energetics: Science and Technology in Central Europe(CALCE EPSC Press, University of Maryland, College Park, MD, 2011, 2011) Armstrong, Ronald; Short, James; Kavetsky, Robert; Anand, DavinderItem Rare Earth Material: Insights and Concerns(CALCE EPSC Press, University of Maryland, College Park, MD, 2011, 2011) Pecht, Michael; Kaczmarek, Robert; Song, Xin; Hazelwood, Dylan; Kavetsky, Robert; Anand, DavinderItem The Hardness and Strength Properties of WC-Co Composites(MDPI, 2011-07-14) Armstrong, Ronald W.The industrially-important WC-Co composite materials provide a useful, albeit complicated materials system for understanding the combined influences on hardness and strength properties of the constituent WC particle strengths, the particle sizes, their contiguities, and of Co binder hardness and mean free paths, and in total, the volume fraction of constituents. A connection is made here between the composite material properties, especially including the material fracture toughness, and the several materials-type considerations of: (1) related hardness stress-strain behaviors; (2) dislocation (viscoplastic) thermal activation characterizations; (3) Hall-Petch type reciprocal square root of particle or grain size dependencies; and (4) indentation and conventional fracture mechanics results. Related behaviors of MgO and Al2O3 crystal and polycrystal materials are also described for the purpose of making comparisons.Item Ultrafast nano-oscillators based on interlayerbridged carbon nanoscrolls(2011-07-25) Zhang, Zhao; Li, TengWe demonstrate a viable approach to fabricating ultrafast axial nano-oscillators based on carbon nanoscrolls (CNSs) using molecular dynamics simulations. Initiated by a single-walled carbon nanotube (CNT), a monolayer graphene can continuously scroll into a CNS with the CNT housed inside. The CNT inside the CNS can oscillate along axial direction at a natural frequency of tens of gigahertz. We demonstrate an effective strategy to reduce the dissipation of the CNS-based nano-oscillator by covalently bridging the carbon layers in the CNS. We further demonstrate that such a CNS-based nano-oscillator can be excited and driven by an external AC electric field, and oscillate at more than 100 GHz. The CNS-based nano-oscillators not only offer a feasible pathway toward ultrafast nano-devices but also hold promise to enable nanoscale energy transduction, harnessing, and storage (e.g., from electric to mechanical).Item Overview of In-Mold Assembly Research at the Advanced Manufacturing Lab(2011-12) Gupta, Satyandra KItem S&T Revitalization: A New Look(CALCE EPSC Press, University of Maryland, College Park, MD, 2012, 2012) Anand, Davinder; Frehill, Lisa; Hazelwood, Dylan; Kavetsky, Robert; Ryan, ElaineItem Measurements of True Leak Rates of MEMS Packages(MDPI, 2012-03-06) Han, BongtaeGas transport mechanisms that characterize the hermetic behavior of MEMS packages are fundamentally different depending upon which sealing materials are used in the packages. In metallic seals, gas transport occurs through a few nanoscale leak channels (gas conduction) that are produced randomly during the solder reflow process, while gas transport in polymeric seals occurs through the bulk material (gas diffusion). In this review article, the techniques to measure true leak rates of MEMS packages with the two sealing materials are described and discussed: a Helium mass spectrometer based technique for metallic sealing and a gas diffusion based model for polymeric sealing.Item Overview of Assembly Modeling, Planning, and Instruction Generation Research at the Advanced Manufacturing Lab(Advanced Manufacturing Lab, 2012-12) Gupta, Satyandra K.Item Topics in Energetics: Research and Development(CALCE EPSC Press, University of Maryland, College Park, MD 2013, 2013) Firebaugh, Millard; Rice, Betsy; Horie, Yasuyuki; Klapotke, Thomas; Short, James; Lynch, Robert; Kavetsky, Robert; Anand, Davinder; Kaczmarek, Robert