Numerical Study Of Pressure Fluctuations Due To High-Speed Turbulent Boundary Layers,
2012
Missouri Unviersity of Science and Technology
Numerical Study Of Pressure Fluctuations Due To High-Speed Turbulent Boundary Layers, Lian Duan, Meelan M. Choudhari, Minwei Wu
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Direct numerical simulations (DNS) are used to examine the pressure fluctuations generated by fully developed turbulence in supersonic turbulent boundary layers with an emphasis on both pressure fluctuations at the wall and the acoustic fluctuations radiated into the freestream. The wall and freestream pressure fields are first analyzed for a zero-pressure gradient boundary layer with Mach 2.5 and Reynolds number based on momentum thickness of approximately 2835. The single and multi-point statistics reported include the wall pressure fluctuation intensities, frequency spectra, space-time correlations, and convection velocities. Single and multi-point statistics of surface pressure fluctuations show good agreement with measured data …
Are Posture Data From Simulated Tasks Representative Of Field Conditions? Case Study For Overhead Electric Utility Workers,
2012
Federal University of São Carlos
Are Posture Data From Simulated Tasks Representative Of Field Conditions? Case Study For Overhead Electric Utility Workers, Cristiane Shinohara Moriguichi, Leticia Carnaz, Luiz Carlos De Miranda Jr, Richard W. Marklin, Helenice Jane Cote Gil Coury
Mechanical Engineering Faculty Research and Publications
Many ergonomics studies are conducted in laboratory-simulated work environments to assess risks for the development of musculoskeletal disorders under more controlled conditions. However, the simulated conditions could be of questionable validity with respect to reproduction of field conditions involving risk factors. The objective of this study was to verify whether the postures recorded for neck extension/flexion and upper arm elevation of overhead electric utility workers in a simulated environment were similar to those recorded in a field environment. Of the three frequently performed tasks analysed, two presented similar exposure in both conditions. However, differences were identified for a more complex …
An In Vitro Comparative Study Of Intracanal Fluid Motion And Wall Shear Stress Induced By Ultrasonic And Polymer Rotary Finishing Files In A Simulated Root Canal Model,
2012
Marquette University
An In Vitro Comparative Study Of Intracanal Fluid Motion And Wall Shear Stress Induced By Ultrasonic And Polymer Rotary Finishing Files In A Simulated Root Canal Model, Jon Koch, John Borg, Abby Mattson, Kris Olsen, James Bahcall
Mechanical Engineering Faculty Research and Publications
Objective. This in vitro study compared the flow pattern and shear stress of an irrigant induced by ultrasonic and polymer rotary finishing file activation in an acrylic root canal model. Flow visualization analysis was performed using an acrylic canal filled with a mixture of distilled water and rheoscopic fluid. The ultrasonic and polymer rotary finishing file were separately tested in the canal and activated in a static position and in a cyclical axial motion (up and down). Particle movement in the fluid was captured using a high-speed digital camera and DaVis 7.1 software. The fluid shear stress analysis was …
Biological Evaluation Of A Novel Tissue Engineering Scaffold Of Layered Double Hydroxides (Ldhs),
2012
Missouri University of Science and Technology
Biological Evaluation Of A Novel Tissue Engineering Scaffold Of Layered Double Hydroxides (Ldhs), Fateme Fayyazbakhsh, Mehran Solati-Hashjin, M. A. Shokrgozar, S. Bonakdar, Y. Ganji, N. Mirjordavi, S. A. Ghavimi, P. Khashayar
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Bone Tissue Engineering (BTE) Composed of Three Main Parts: Scaffold, Cells and Signaling Factors. Several Materials and Composites Are Suggested as a Scaffold for BTE. Biocompatibility is One of the Most Important Property of a BTE Scaffold. in This Work Synthesis of a Novel Nanocomposite Including Layered Double Hydroxides (LDH) and Gelatin is Carried Out and its Biological Properties Were Studied. the Co-Precipitation (PH=11) Method Was Used to Prepare the LDH Powder, using Calcium Nitrate, Magesium Nitrate and Aluminum Nitrate Salts as Starting Materials. the Resulted Precipitates Were Dried. X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron …
Generating Tones With A Vibrato Effect,
2012
Missouri University of Science and Technology
Generating Tones With A Vibrato Effect, M. Nakagawa, Shun Takai
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Provided are a method, computer storage device, and tone control device for generating tones with a vibrato effect. A determination is made of a key depression interval comprising a difference of a current time of a current note from a previous time of a previous note. A performance mode is set to a single tone mode, in which only one note is generated, or a polyphonic mode, in which multiple notes are simultaneously generated, based on the determined key depression interval. The tone is generated to output the current note with a first modulation magnitude in response to determining that …
Electrospun Carbon Nanofibers Decorated With Various Amounts Of Electrochemically-Inert Nickel Nanoparticles For Use As High-Performance Energy Storage Materials,
2012
North Carolina State University at Raleigh
Electrospun Carbon Nanofibers Decorated With Various Amounts Of Electrochemically-Inert Nickel Nanoparticles For Use As High-Performance Energy Storage Materials, Liwen Ji, Zhan Lin, Mataz Alcoutlabi, Ozan Toprakci, Yingfang Yao, Guanjie Xu, Shuli Li, Xiangwu Zhang
Mechanical Engineering Faculty Publications
Carbon nanofibers decorated with various amounts of electrochemically-inert metallic nickel nanoparticles are synthesized through electrospinning and carbonization processes. The morphology and composition of Ni nanoparticles in carbon nanofibers are controlled by preparing different nanofiber precursors. The lithium-ion battery performance evaluations indicated that the content of electrochemically-inert Ni nanoparticles in carbon nanofibers has a great influence on the final electrochemical performance. For example, at certain Ni contents, these composite nanofibers display excellent electrochemical performance, such as high reversible capacities, good capacity retention, and excellent rate performance, when directly used as binder-free anodes for rechargeable lithium-ion batteries. However, when the Ni content …
Simulation And Testing Of Polymer Electrolyte Membrane Fuel Cell Bipolar Plates Fabricated By Selective Laser Sintering,
2012
Missouri University of Science and Technology
Simulation And Testing Of Polymer Electrolyte Membrane Fuel Cell Bipolar Plates Fabricated By Selective Laser Sintering, M. Wu, Ming-Chuan Leu, N. Guo
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Polymer Electrolyte Membrane (PEM) fuel cell converts directly electrochemical energy into electricity. Flow channels in bipolar plates, a critical component of fuel cell, were designed, simulated and tested. the bipolar plate used a mixture of graphite materials and was fabricated using a Selective Laser Sintering (SLS) process. the fabricated green parts were carbonized at high temperatures and converted into brown parts. Infiltration of resin was used to enhance the electric conductivity and strength of the bipolar plate. Finite element simulations were performed to investigate the state of species (hydrogen, oxygen) in the channels and Gas Diffusion Layers (GDLs) for four …
Improving The Efficiency Of Turbocharged Spark Ignition Engines For Passenger Cars Through Waste Heat Recovery,
2012
Missouri University of Science and Technology
Improving The Efficiency Of Turbocharged Spark Ignition Engines For Passenger Cars Through Waste Heat Recovery, Alberto A. Boretti
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The turbocharged direct injection stoichiometric spark ignition gasoline engine has less than Diesel full load brake engine thermal efficiencies and much larger than Diesel penalties in brake engine thermal efficiencies reducing the load by throttling. This engine has however a much better power density, and therefore may operate at much higher BMEP values over driving cycles reducing the fuel economy penalty of the vehicle. This engine also has the advantage of the very well developed three-way catalytic converter after treatment to meet future emission regulations. in these engines the efficiency may be improved recovering the waste heat, but this recovery …
Energy Recovery In Passenger Cars,
2012
Missouri University of Science and Technology
Energy Recovery In Passenger Cars, Alberto A. Boretti
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The turbocharged direct injection stoichiometric spark ignition gasoline engine has less than diesel full load brake engine thermal efficiencies and much larger than diesel penalties in brake engine thermal efficiencies reducing the load. This engine has, however, a much better power density, and therefore may operate at much higher brake mean effective pressure (BMEP) values over driving cycles thus reducing the fuel economy penalty of the vehicle. This engine also has the advantage of the very well developed three-way catalytic (TWC) converter after treatment to meet future emission regulations. Replacement of fossil gasoline with renewable gasoline-like fuels has major advantages. …
Kers Braking For 2014 F1 Cars,
2012
Missouri University of Science and Technology
Kers Braking For 2014 F1 Cars, Alberto A. Boretti
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Small, high power density turbocharged engines coupled to kinetic energy recovery systems are one of the key areas of development for both passenger and racing cars. in passenger cars, the KERS may reduce the amount of thermal energy needed to reaccelerate the car following a deceleration recovering part of the braking energy. This translates in a first, significant fuel energy saving. Also considering the KERS torque boost increasing the total torque available to accelerate the car, large engines working at very low brake mean effective pressures and efficiencies over driving cycles may also be replaced by small higher power density …
Electronic Musical Instrument To Generate Musical Tones To Imitate A Stringed Instrument,
2012
Missouri University of Science and Technology
Electronic Musical Instrument To Generate Musical Tones To Imitate A Stringed Instrument, M. Nakagawa, Shun Takai, Shun Takai
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Provided are an electronic musical instrument, computer Storage device, and method for generating tone. A sound source in an electronic musical instrument generates a first tone at a first pitch in response to a first tone generation instruction received by an input device of the electronic musical instrument. A second tone generation instruction is received to generate a second tone at a second pitch while generating the first tone at the sound source. A determination is made of a pitch difference of the first and the second pitches. The sound source is controlled to generate the second tone and to …
Electronic Musical Instrument,
2012
Missouri University of Science and Technology
Electronic Musical Instrument, M. Nakagawa, Shun Takai
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Provided are an electronic musical instrument, computer storage device, and method generating tones for held notes. Indication is made of held notes having pitches as held in response to receiving note-on information for the held notes from an input device of an electronic musical instrument while receiving hold information from a hold device of the electronic musical instrument. Note-on information is received for a received note having a pitch while generating the pitches for the held notes. Selection is made of one of the held notes to release according to a first selection criteria in response to determining that the …
Nebraska Summary: S852 Case-Ih Maxxum 120,
2012
University of Nebraska-Lincoln
Nebraska Summary: S852 Case-Ih Maxxum 120, Nebraska Tractor Test Lab
Nebraska Tractor Tests
ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …
Nanosatellite Fabrication And Analysis,
2012
Santa Clara University
Nanosatellite Fabrication And Analysis, Sam Harrison, Patrick Scott, Victor Zapien
Mechanical Engineering Senior Theses
The advancements in technologies used in the aerospace industry have allowed universities to experiment with and develop small-scale satellites. Universities are taking advantage of the relatively low development costs of nanosatellite programs to give students experience in the field of spacecraft design. The purpose of Santa Clara University's team, Nanosatellite Fabrication and Analysis, is to create a process to expedite the design, analysis, and fabrication phase of nanosatellite structures for students working on future satellite missions. The objective is to design four baseline nanosatellite structures to accommodate a range of potential missions where the designs are simple enough to be …
Project Omoverhi : A Thermal Storage Solution,
2012
Santa Clara University
Project Omoverhi : A Thermal Storage Solution, Peter J. Graham, P. Alexander Kranenburg, Tor C. Krog, Cameron C. Schwab
Mechanical Engineering Senior Theses
One principal energy source that is underutilized in the world today is solar energy. While the United States has tried to make a push for reusable and 'green' energy sources, these sources are frequently overlooked in developing nations. While the set up costs of solar energy may be expensive due to installation and the high cost of certain parts, the savings over time is well worth the initial cost. In many developing nations large areas of the country are off of the power grid or have inconsistent power. One way to help people living in these areas is by introducing …
Design And Analysis Of A Low-Profile Two-Axis Solar Tracker With Hybridized Control,
2012
Santa Clara University
Design And Analysis Of A Low-Profile Two-Axis Solar Tracker With Hybridized Control, Laughlin Barker, Criselle Olaes, Joseph Valdez, Darcy Marumoto
Mechanical Engineering Senior Theses
The adoption of solar power technologies throughout the world is increasing rapidly. Solar trackers are a necessary component in Concentrated Solar Power (CSP) applications and have also shown up to 46% per annum energy increase in photovoltaic (PV) panels when compared with fixed mounted panels. To resist wind forces, trackers typically incorporate heavy structural components and reinforced concrete foundations. Thus, the manufacture and installation of trackers is costly due to their size, weight, and careful consideration of geological conditions. This work presents a new solar tracker design for use with concentrating solar power and photovoltaic panels. The tracker is comprised …
Solar Powered Water Purification System,
2012
Santa Clara University
Solar Powered Water Purification System, Alina Carlson, Reece Kiriu, Andrew Nosé, Christopher Sugii, Erin Taketa, Alex Tamai
Mechanical Engineering Senior Theses
Santa Clara University's 2011-2012 Solar-Powered Water Purification System team is developing a solution to create a water distillation system, heated by solar troughs and solely powered by photovoltaic (PV) panels that can produce clean, drinkable water. This device would balance cost and efficiency to be marketable to lower-income locations, such as developing countries that suffer from shortages of clean water. In accomplishing this, the team will ensure that the system is sustainable and requires minimal maintenance.
Modeling Of Dynamics Of Gyroscopic Systems,
2012
Louisiana State University and Agricultural and Mechanical College
Modeling Of Dynamics Of Gyroscopic Systems, Siddharth Sharma
LSU Master's Theses
The amplitude of vibrations of a rotating system operating near or at its critical speed grows without bound. This poses a serious problem for the rotating machinery industry from the perspective of design, maintenance, vibration troubleshooting and stability of the rotating equipments.
In this thesis, we wish to develop an exact method of analysis for the system of a mass-less symmetrical shaft rotating in symmetrical bearings (SSSB) with finite displacement at bearing end. The method so developed is expected to be extended to the SSSB model of a shaft having mass. The stability analysis is performed for both the systems. …
Numerical And Experimental Evaluation Of Preheated Premixed Flames At Lean And Rich Conditions,
2012
Louisiana State University and Agricultural and Mechanical College
Numerical And Experimental Evaluation Of Preheated Premixed Flames At Lean And Rich Conditions, Joseph Edward Gibson
LSU Master's Theses
Preheating a combustible mixture enhances the laminar burning flux characteristic mad with high reaction firing rates. As a result, the flammable zone as defined by inlet conditions of equivalence ratio and temperature is expanded beyond that available at standard ambient conditions; however, fundamental questions in these combustion regimes have not been addressed. In this thesis, preheated lean and rich combustion of methane/air mixtures is studied numerically and experimentally to catalog and confirm expected trends in these regimes. Numerical simulations were completed using both GRI-Mech 3.0 and San Diego mechanisms in the combustion code Cantera. An adiabatic simulation data set …
An Empirical Study On Quality Management Practices, Organization Performance And Suppliers' Selection In Southern Minnesota Manufacturing Firms,
2012
Minnesota State University - Mankato
An Empirical Study On Quality Management Practices, Organization Performance And Suppliers' Selection In Southern Minnesota Manufacturing Firms, Rachel Yetunde-Abiodun Awoku
All Graduate Theses, Dissertations, and Other Capstone Projects
Quality management systems (QMS) have been widely applied successfully by many manufacturing companies to improve their process, increase profits and organizational performance. The most applied of the quality programs are ISO 9001, Total Quality Management (TQM), Just-In-time (JIT), Lean Management and Six Sigma. Although past studies on quality management have identified and studied the implementation of quality management practices, there is little or no research on quality management practices and business performance in Southern Minnesota manufacturing companies. Many researchers have concluded that the implementation of quality management practices has led to significant improvements in companies' business performance while others have …
