Contributions Of Mass And Bond Energy Difference And Interface Defects On Thermal Boundary Conductance,
2015
Utah State University
Contributions Of Mass And Bond Energy Difference And Interface Defects On Thermal Boundary Conductance, Nicholas A. Roberts, Changjin Choi
Mechanical and Aerospace Engineering Faculty Publications
The impact of mass and bond energy difference and interface defects on thermal boundary conductance (TBC) is investigated using non-equilibrium molecular dynamics (NEMD) with the Lennard-Jones (L-J) interatomic potential. Results show that the maximum TBC is achieved when the mass and bond energy of two dissimilar materials are matched, although the effective thermal conductivity is not necessarily a maximum due to the contributions of the thermal conductivity of the constituent materials. Mass and bond energy differences result in a mismatch between phonon dispersions, limiting high frequency phonon transport at the interface. This frequency mismatch is defined by a frequency ratio, …
The Rapidly Reconfigurable Research Cockpit,
2015
Florida Institute of Technology
The Rapidly Reconfigurable Research Cockpit, Richard Joyce
Link Foundation Modeling, Simulation and Training Fellowship Reports
The goal of the Rapidly Reconfigurable Research Cockpit (R3C) project is to create and evaluate a novel approach for aviation simulators. Our concept combines a virtual reality visual environment with the tactile feedback typically found in early stage mockups. A low cost, easily modified, yet geometrically accurate cockpit panel (fabricated using 3D printing, for example) can be used while the pilot/operator wears a head-mounted display providing the visual overlay of the simulator.
A Brief History Of Space - Sse 120 Session 1,
2015
Morehead State University
A Brief History Of Space - Sse 120 Session 1, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs on "A Brief History of Space - Session 01" from August 30, 2015.
Medium-Range Forecast Of The Arctic Sea-Ice Cover Using The Satellite Observation Data,
2015
National Institute of Polar Research
Medium-Range Forecast Of The Arctic Sea-Ice Cover Using The Satellite Observation Data, Kimura Noriaki
ShipArc 2015 Conference
No abstract provided.
Use Of Satellite Sar Observations Integrated In Arctic Maritime Situational Awareness,
2015
Kongsberg Satellite Services
Use Of Satellite Sar Observations Integrated In Arctic Maritime Situational Awareness, Hans Eilif Larsen
ShipArc 2015 Conference
No abstract provided.
A Brief History Of Space - Sse 120 Questions 01,
2015
Morehead State University
A Brief History Of Space - Sse 120 Questions 01, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs on "A Brief History of Space - Questions 01" from August 26, 2015.
A Brief History Of Space - Sse 120 Questions 02,
2015
Morehead State University
A Brief History Of Space - Sse 120 Questions 02, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs on "A Brief History of Space - Questions 02" from August 25, 2015.
A Brief History Of Space - Sse 120 Questions 04,
2015
Morehead State University
A Brief History Of Space - Sse 120 Questions 04, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs on "A Brief History of Space - Questions 04" from August 25, 2015.
A Brief History Of Space - Sse 120 Questions 03,
2015
Morehead State University
A Brief History Of Space - Sse 120 Questions 03, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs on "A Brief History of Space - Questions 03" from August 25, 2015.
What Is Orbital Debris?,
2015
Morehead State University
What Is Orbital Debris?, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs on "What is Orbital Debris?" from August 24, 2015.
Brief Look At The Environment Of Space,
2015
Morehead State University
Brief Look At The Environment Of Space, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Brief Look at the Environment of Space" from August 24, 2015.
Shape Optimization Of Busemann-Type Biplane Airfoil For Drag Reduction Under Nonlifting And Lifting Conditions Using Genetic Algorithms,
2015
Washington University in St. Louis
Shape Optimization Of Busemann-Type Biplane Airfoil For Drag Reduction Under Nonlifting And Lifting Conditions Using Genetic Algorithms, Yi Tian
McKelvey School of Engineering Graduate Student Theses & Dissertations
The focus of this thesis is on the shape optimization of the Busemann-type biplane airfoil for drag reduction under both nonlifting and lifting conditions using genetic algorithms. The concept of the Busemann-type biplane airfoil was first introduced by Adolf Busemann in 1935. Under its design condition at a specific supersonic flow speed, the Busemann biplane airfoil eliminates all wave drag due to its symmetrical biplane configuration; however it produces zero lift. Previous research has shown that the original Busemann biplane airfoil design has a poor performance under off-design conditions as well. In order to solve this problem of zero lift …
Application Of Wray-Agarwal Model To Turbulent Flow In A 2d Lid-Driven Cavity And A 3d Lid-Driven Box,
2015
Washington University in St. Louis
Application Of Wray-Agarwal Model To Turbulent Flow In A 2d Lid-Driven Cavity And A 3d Lid-Driven Box, Hakop J. Nagapetyan
McKelvey School of Engineering Graduate Student Theses & Dissertations
In this thesis, various turbulence models are used for simulating internal vortical flow, both turbulent and laminar, with large recirculation by considering the flow in a 2-D lid-driven square cavity and a 3-D lid driven cubic box. The accuracy of the newly developed Wray-Agarwal (WA) one equation turbulence model is compared against two well-known industry standard turbulence models; the Spalart-Allmaras (SA) and the Shear-Stress-Transport (SST) k-ω models. The simulations are performed by numerically solving the Reynolds-Averaged Navier-Stokes (RANS) equations in conjunction with WA, SA and SST k-ω models and comparing the results with the available experimental data and Large Eddy …
Dynamic Characteristics Of Biologically Inspired Hair Receptors For Unmanned Aerial Vehicles,
2015
LSU New Orleans
Dynamic Characteristics Of Biologically Inspired Hair Receptors For Unmanned Aerial Vehicles, Manohar Chidurala
LSU New Orleans Theses and Dissertations
The highly optimized performance of nature’s creations and biological assemblies has inspired the development of their engineered counter parts that can potentially outperform conventional systems. In particular, bat wings are populated with air flow hair receptors which feedback the information about airflow over their surfaces for enhanced stability and maneuverability during their flight. The hairs in the bat wing membrane play a role in the maneuverability tasks, especially during low-speed flight. The developments of artificial hair sensors (AHS) are inspired by biological hair cells in aerodynamic feedback control designs. Current mathematical models for hair receptors are limited by strict simplifying …
Orbital Debris Mitigation Policy And Unique Challenges For Small Satellites,
2015
Morehead State University
Orbital Debris Mitigation Policy And Unique Challenges For Small Satellites, J. C. Liou, David Jarkey
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by J. C. Liou and David Jarkey titled "Orbital Debris Mitigation Policy and Unique Challenges for Small Satellites" at the Small Satellite Conference on August 10, 2015.
Overview Of The Orbital Debris Problem,
2015
Morehead State University
Overview Of The Orbital Debris Problem, J. C. Liou
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by J. C. Liou titled "Overview of the Orbital Debris Problem" at the Small Satellite Conference on August 10, 2015.
Characterizing Strain Accumulation, Residual Stress, And Microstructure Of Additive Manufactured Materials,
2015
Purdue University
Characterizing Strain Accumulation, Residual Stress, And Microstructure Of Additive Manufactured Materials, Hannah K. Woods, Todd A. Book, Catalina Parada, Michael D. Sangid
The Summer Undergraduate Research Fellowship (SURF) Symposium
Additive Manufacturing (AM) is a rapidly evolving fabrication technology beneficial for its cost-saving potential to produce complex, low-volume shapes. However, AM materials are currently limited to nonstructural applications due to variability in their structural integrity, particularly their fatigue lives. IN718, Ti64, and Al10MgSi specimens manufactured by Direct Metal Laser Sintering (DMLS) were characterized based on variation of post-processing techniques and build direction. To understand the impact of each variable, surface roughness, hardness, residual stresses, microstructure, and strain accumulation in response to Low Cycle Fatigue (LCF) were studied. The use of Electron Backscatter Diffraction (EBSD) provided grain orientation and grain size …
Refinement And Validation Of A Real-Time Airborne System For Remotely Sensing Ocean Surface Using Communication Satellite Signals,
2015
Oakland University
Refinement And Validation Of A Real-Time Airborne System For Remotely Sensing Ocean Surface Using Communication Satellite Signals, Benjamin R. Nold, Han Zhang, James L. Garrison
The Summer Undergraduate Research Fellowship (SURF) Symposium
The ability to remotely sense ocean wave heights and wind speed by measuring the reflected Radio Frequency (RF) signals from the ocean’s surface has been demonstrated in previous research projects. The recording systems for these research projects collected and stored unmodified RF signals and then analyzed the data through post-processing. Several disadvantages to this approach include large requirements for data storage and lengthy post-processing time. To assist in the creation of a suitable platform for an airplane-based application, a new system was designed which features real-time processing of the RF signals. This system captures two RF signals in the 2.4 …
Assessment Of Critical Technologies For Gas Turbine Engines Using Numerical Tools,
2015
Purdue University
Assessment Of Critical Technologies For Gas Turbine Engines Using Numerical Tools, Vinicius Pessoa Mapelli, Guillermo Paniagua, Jorge Sousa
The Summer Undergraduate Research Fellowship (SURF) Symposium
In 2014 gas turbine engine has reached a market value of 82.5 billion dollars, of which 59.5% are related to aircraft propulsion. The continuous market expansion attracts more and more the interest of researchers and industries towards the development of accurate numerical techniques to model thermodynamically the entire engine. This practice allows a performance and optimization analysis before the actual experimental testing, reducing the time and required investment in the design of a new engine. In this paper, a recently developed open source numerical tool named “Toolbox for the Modeling and Analysis of Thermodynamic Systems” (T-MATS) is used to assess …
Dsmc Simulation Of Microstructure Actuation By Knudsen Thermal Force,
2015
Purdue University
Dsmc Simulation Of Microstructure Actuation By Knudsen Thermal Force, Aaron Pikus, Israel Sebastiao, Andrew Strongrich, Alina Alexeenko
The Summer Undergraduate Research Fellowship (SURF) Symposium
In many industrial and research applications there is a need for vacuum sensors with higher accuracy and spatial resolution than what is currently available. Examples of target applications include high-altitude platforms, satellites and in-vacuum manufacturing processes such as freeze-drying of food and pharmaceuticals. In this connection, a novel pressure sensor, named Microelectromechanical In-plane Knudsen Radiometric Actuator (MIKRA), has been developed by at Purdue University. MIKRA is based on Knudsen thermal forces generated by rarefied flow driven by thermal gradients within the microstructure Thus, the goal of this work is to model the rarefied gas flow in the MIKRA sensor under …
