Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Energy Systems (25)
- Physical Sciences and Mathematics (21)
- Aerospace Engineering (18)
- Other Mechanical Engineering (17)
- Arts and Humanities (15)
-
- Education (15)
- History (15)
- History of Science, Technology, and Medicine (15)
- Science and Mathematics Education (15)
- United States History (15)
- Manufacturing (4)
- Structures and Materials (4)
- Civil and Environmental Engineering (3)
- Electrical and Computer Engineering (3)
- Industrial Engineering (3)
- Operations Research, Systems Engineering and Industrial Engineering (3)
- Applied Mechanics (2)
- Engineering Education (2)
- Life Sciences (2)
- Ocean Engineering (2)
- Oceanography (2)
- Oceanography and Atmospheric Sciences and Meteorology (2)
- Agricultural Economics (1)
- Agriculture (1)
- Biochemical and Biomolecular Engineering (1)
- Chemical Engineering (1)
- Chemistry (1)
- Civil Engineering (1)
- Institution
-
- University of Nebraska - Lincoln (16)
- Missouri University of Science and Technology (13)
- University of Central Florida (9)
- California Polytechnic State University, San Luis Obispo (6)
- New Jersey Institute of Technology (5)
-
- Old Dominion University (5)
- American University in Cairo (2)
- Portland State University (2)
- University of Mississippi (2)
- William & Mary (2)
- Brigham Young University (1)
- Cleveland State University (1)
- Department of Primary Industries and Regional Development, Western Australia (1)
- Embry-Riddle Aeronautical University (1)
- Iowa State University (1)
- Marquette University (1)
- Michigan Technological University (1)
- University of New Hampshire (1)
- Keyword
-
- Buildings (4)
- Robots (3)
- Brushless DC Motors (2)
- DC Motors (2)
- Magnetic Saturation (2)
-
- Optimisation (2)
- Reluctance Variations (2)
- Acoustic emission (1)
- Air pollution (1)
- Algorithms (1)
- Analytical Solution (1)
- Arbitrary Number of Layers (1)
- Autonomous Sweeps (1)
- Axis-angle parameters (1)
- Axisymmetric (1)
- BLDCM (1)
- Boundary layer (1)
- Brushless DC motors (1)
- Cell Mapping (1)
- Closed-Form Exact Solution (1)
- Coal (1)
- Coincidence site lattice (1)
- Coke (1)
- Complex configuration (1)
- Composite structure (1)
- Computation Times (1)
- Computational Geometry (1)
- Computer vision (1)
- Computerised Signal Processing (1)
- Connected (1)
- Publication
-
- Nebraska Tractor Tests (15)
- Mechanical and Aerospace Engineering Faculty Research & Creative Works (12)
- FSEC Energy Research Center® (9)
- Mechanical & Aerospace Engineering Theses & Dissertations (4)
- Theses (4)
-
- Industrial and Manufacturing Engineering (3)
- Office of the Provost Scholarship (3)
- Archived Theses and Dissertations (2)
- Dissertations and Theses (2)
- Dissertations, Theses, and Masters Projects (2)
- Ole Miss Engineer (2)
- Civil & Environmental Engineering Theses & Dissertations (1)
- Computer Science Faculty Research & Creative Works (1)
- Department of Mechanical and Materials Engineering: Faculty Publications (1)
- Dissertations (1)
- Faculty Publications (1)
- Journal of the Department of Agriculture, Western Australia, Series 4 (1)
- Master's Theses - Daytona Beach (1)
- Mechanical Engineering Faculty Publications (1)
- Mechanical Engineering Faculty Research and Publications (1)
- Michigan Tech Patents (1)
- RISK: Health, Safety & Environment (1990-2002) (1)
- Richard Alan Lesar (1)
- Publication Type
Articles 1 - 30 of 70
Full-Text Articles in Mechanical Engineering
On Local Stresses And Spring Constants Of Pipe-Nozzle Connection, Hson-Chih Sun
On Local Stresses And Spring Constants Of Pipe-Nozzle Connection, Hson-Chih Sun
Dissertations
This thesis presents a comprehensive study of local stresses and spring coefficients of pipe with a nozzle connection, analyzed by the finite element method (FEM). Six types of loading are discussed: radial force, circumferential moment, longitudinal moment, circumferential shear force, longitudinal shear force, and torsional moment.
For the local stresses, the bending and membrane stress factors due to each of these loadings are presented in a series of plots with various gamma (piping radius/thick-ness) and beta (nozzle radius/pipe radius) values. These stress factors will readily replace those previously published in WRC No. 107. This work not only gives more accurate …
The Planet Janitor: A Symbol Of Global Concerns, Florida Solar Energy Center, Public Information Office
The Planet Janitor: A Symbol Of Global Concerns, Florida Solar Energy Center, Public Information Office
FSEC Energy Research Center®
Meet the Planet Janitor. A kindly. yet determined gent. He works at the Florida Solar Energy Center where he is a spokesman for energy-related issues. He illustrates the need to sweep up all environmental messes we've made. He reminds us to maintain our home - Planet Earth. He dramatizes our role as custodians of our children's inheritance. He knows and he shows how the individual can make a difference.
Renewable Energy Activities For Middle Grades, Florida Solar Energy Center, David Lahart
Renewable Energy Activities For Middle Grades, Florida Solar Energy Center, David Lahart
FSEC Energy Research Center®
The Florida Solar Energy Center (FSEC) is a research and education arm of the State University System hosted by the University of Central Florida. The Florida legislature established FSEC in 1974 to conduct research in alternative energy technologies, to ensure the quality of solar energy equipment sold in Florida, and to educate people about renewable energy technology.
One method of disseminating research results has been through teacher education programs and the development of instructional materials. FSEC-developed materials are designed to teach science and social studies research methods and/or process skills. The units have been field-tested and correlated with student performance …
Composite Structure Ultimate Strength Prediction From Acoustic Emission Amplitude Data, James Lewis Walker Ii
Composite Structure Ultimate Strength Prediction From Acoustic Emission Amplitude Data, James Lewis Walker Ii
Master's Theses - Daytona Beach
The acoustic emission (AE) given off by a structure as it is stressed provides a passive means to characterize flaw growth activity in complex structures. This thesis demonstrates how the qualitative analysis of AE data can be refined to provide a quantitative tool for predicting the ultimate strength of composite tensile test specimens. From an original sample set of only six specimens, a multivariate statistical analysis was used to generate an ultimate strength prediction equation. The variables of the multivariate statistical analysis were obtained through the mathematical modeling of the specimen’s AE amplitude distributions produced during proof testing. Ultimate strengths …
Radon Pressure Differential Project; Phase Ii Infiltration, Florida Solar Energy Center, James Cummings
Radon Pressure Differential Project; Phase Ii Infiltration, Florida Solar Energy Center, James Cummings
FSEC Energy Research Center®
Testing has been done on 50 central Florida homes to assess and characterize house infiltration rates in new (age five years or less) Florida homes. These 50 were drawn randomly from a sample of 70 homes which had been previously tested to determine house airtightness, air distribution system leakage, and pressure differentials. The 50 homes had an average airtightness of 7.31 air changes per hour at 50 Pascals (ACH50). Significant leaks were found in the ductwork in a majority of homes tested, both on the supply and return sides of the air handler. When the air distribution system was sealed …
Radon Pressure Differential Project, Phase I, Florida Solar Energy Center, James Cummings
Radon Pressure Differential Project, Phase I, Florida Solar Energy Center, James Cummings
FSEC Energy Research Center®
Testing has been done on 70 central Florida homes to assess and characterize pressure differentials in new (age five years or less) Florida homes. Blower door testing was done to determine house airtightness and air distribution system leakage. The 70 homes had an average airtightness of 7.23 air changes per hour at 50 Pascals (ACH50). Significant leaks were found in the ductwork in a majority of homes tested, both on the supply and return sides of the air handler. When the air distribution system was sealed off, house ACH50 decreased to 6.42, indicating that 11.2% of the house leak area …
Decomposition Of Measured Contours Into Geometric Features For Dimensional Inspection, Devaraj Rajkumar
Decomposition Of Measured Contours Into Geometric Features For Dimensional Inspection, Devaraj Rajkumar
Dissertations and Theses
Image processing systems used in Vision Assisted Dimensional Inspection usually output a set of boundary pixels representing the part edges. This boundary information must be divided into several subsets representing the various edges of the actual object, so that comparisons with the nominal part can be made.
The purpose of this project is to devise a method to divide the set of pixels obtained from the image processing system into subsets of pixels. Each of these subsets represent an edge in the contour of the actual object. This method must also detect transition points between the adjacent features. This project …
Advanced Space Design Program, William W. Durgin, Francis C. Lutz
Advanced Space Design Program, William W. Durgin, Francis C. Lutz
Office of the Provost Scholarship
Worcester Polytechnic Institute's Advanced Space Design (ASD) Program provides project-based design experiences that combine a highly motivating, need-to-know experience with an integrative capstone design that draws on the know-how of practitioners in the profession. Mechanical engineering students work with their counterparts in electrical, chemical, and civil engineering to develop integrated packages of experiments to be conducted in the micro-gravity environment of space.
Free Energy Simulation Of Grain Boundary Segregation And Thermodynamics In Ni3−Xal1+X, R. Najafabadi, H.Y. Wang, D. J. Srolovitz, Richard Alan Lesar
Free Energy Simulation Of Grain Boundary Segregation And Thermodynamics In Ni3−Xal1+X, R. Najafabadi, H.Y. Wang, D. J. Srolovitz, Richard Alan Lesar
Richard Alan Lesar
The free energy simulation method is employed to study segregation to Σ5 and Σ13 (001) twist grain boundaries and their free energies in ordered Ni3−xAl1+x. In the temperature range studied (300–900K), it is shown that there is almost no segregation, strong Al segregation, and weak Ni segregation to the grain boundary for the stoichiometric, Al-rich, and Ni-rich bulk compositions respectively. It is also shown that the segregation is limited to a few (002) planes around the grain boundary and its magnitude decreases with increasing temperature. For Al-rich bulk composition, it is demonstrated that segregation at low temperature substantially lowers the …
Design For Manufacturing Of Mechanical Power Transmission Shafts, Tamer Mohamed Wasfy
Design For Manufacturing Of Mechanical Power Transmission Shafts, Tamer Mohamed Wasfy
Archived Theses and Dissertations
No abstract provided.
Space Structures: Issues In Dynamics And Control, H. Benaroya, Mark L. Nagurka
Space Structures: Issues In Dynamics And Control, H. Benaroya, Mark L. Nagurka
Mechanical Engineering Faculty Research and Publications
A selective technical overview is presented on the vibration and control of large space structures, the analysis, design, and construction of which will require major technical contributions from the civil/structural, mechanical, and extended engineering communities. The immediacy of the U.S. space station makes the particular emphasis placed on large space structures and their control appropriate. The space station is but one part of the space program, and includes the lunar base, which the space station is to service. This paper attempts to summarize some of the key technical issues and hence provide a starting point for further involvement. The first …
Integrated Control Of Thermally Distorted Large Space Antennas, Robert H. Tolson
Integrated Control Of Thermally Distorted Large Space Antennas, Robert H. Tolson
Mechanical & Aerospace Engineering Theses & Dissertations
Studies on controlling the thermal distortion of large space antennae have generally investigated a single orbital position and have optimized actuator locations based on minimizing the RMS surface deviation from the original parabolic shape. One study showed the benefits of directly using far zone electric field characteristics as the performance measure; but, this approach resulted in a nonlinear programming problem. The objective of the current study is to develop an approach to designing a control system that (1) recognizes the time dependence of the distortion and (2) controls variables that are directly related to far field performance in a quadratic …
Finite Element Analysis Of Thermal Stresses In Semiconductor Devices, Joachim Karl Wilhelm Duerr
Finite Element Analysis Of Thermal Stresses In Semiconductor Devices, Joachim Karl Wilhelm Duerr
Dissertations and Theses
The failure of integrated circuit due to Silicon fracture is one of the problems associated with the production of a semiconductor device. The thermal stresses, which result in die cracking, are for the most part induced during the cooling process after attaching the die with Gold-Silicon solder. Major factors for stress generation in material systems are commonly large temperature gradients and substantial difference in coefficients of thermal expansion.
This research covers the thermal stresses introduced upon cooling a composite Silicon device. A transient thermal analysis has been performed to determine the temperature gradients. The stress distribution has been investigated. For …
Nondestructive Detection Of An Undeserable Metallic Phase, T1, During Processing Of Alumnum-L Thumalloys, Otto Buck, David J. Bracci, David C. Jiles, Lisa J.H. Brasche, Jeffrey E. Shield, Leonard S. Chumbley
Nondestructive Detection Of An Undeserable Metallic Phase, T1, During Processing Of Alumnum-L Thumalloys, Otto Buck, David J. Bracci, David C. Jiles, Lisa J.H. Brasche, Jeffrey E. Shield, Leonard S. Chumbley
Department of Mechanical and Materials Engineering: Faculty Publications
A method is disclosed for detecting the T1 phase in aluminum-lithium alloys through simultaneous measurement of conductivity and hardness. In employing eddy current to measure conductivity, when the eddy current decreases with aging of the alloy, while the hardness of the material continues to increase, the presence of the T1 phase may be detected.
Electrical Use, Efficiency, And Peak Demand Of Electric Resistance, Heat Pump, Desuperheater, And Solar Hot Water Systems, Florida Solar Energy Center, Timothy Merrigan
Electrical Use, Efficiency, And Peak Demand Of Electric Resistance, Heat Pump, Desuperheater, And Solar Hot Water Systems, Florida Solar Energy Center, Timothy Merrigan
FSEC Energy Research Center®
Eighty single family residences in Florida were monitored for two years in order to collect data on water heating electrical energy consumption, efficiency, and time-of-day demand. The homes were divided into equally sized samples of four different water heating systems: conventional electric resistance, heat pump, desuperheater and solar hot water systems. Electrical consumption for electric resistance water heaters averaged 8.3 kWh per day in Florida with an average water heating system efficiency of 82%. Desuperheaters used an annual average of 7.4 kWh per day at an annual system efficiency of 110% and heat pump water heaters used 6.1 kWh per …
Navier-Stokes Simulations Of Flows About Complex Configurations Using Domain Decomposition Techniques, Kamran Fouladi-Semnani
Navier-Stokes Simulations Of Flows About Complex Configurations Using Domain Decomposition Techniques, Kamran Fouladi-Semnani
Mechanical & Aerospace Engineering Theses & Dissertations
An algorithm is developed to obtain numerical simulations of flows about complex configurations composed of multiple and nonsimilar components with arbitrary geometries. The algorithm uses a hybridization of the domain decomposition techniques for grid generation and to reduce the computer memory requirement. Three dimensional, Reynolds-averaged, unsteady, compressible, and complete Navier-Stokes equations are solved on each of the subdomains by a fully-vectorized, finite-volume, upwind-biased, approximately-factored, and multigrid method. The effect of Reynolds stresses is incorporated through an algebraic turbulence model with several modifications for interference flows. The present algorithm combines the advantages of an efficient, geometrically conservative, minimally and automatically dissipative …
Synergy Of Artificial Neural Networks And Knowledge-Based Expert Systems For Intelligent Fms Scheduling, Luis Carlos Rabelo, Sema E. Alptekin, Ali S. Kiran
Synergy Of Artificial Neural Networks And Knowledge-Based Expert Systems For Intelligent Fms Scheduling, Luis Carlos Rabelo, Sema E. Alptekin, Ali S. Kiran
Industrial and Manufacturing Engineering
In this paper we describe a hybrid architecture that integrates artificial neural networks and knowledge-based expert systems to generate solutions for the real time scheduling of flexible manufacturing systems. The artificial neural networks perform pattern recognition and, due to their inherent characteristics, support the implementation of automated knowledge acquisition and refinement schemes through a feedback mechanism. The artificial neural network structures enable the system to recognize patterns in the tasks to be solved in order to select the best scheduling rule according to different demands. The knowledge-based expert systems are the higher order elements which drive the inference strategy and …
Coke Oven Emissions: A Case Study Of Technology-Based Regulation, John D. Graham, David R. Holtgrave
Coke Oven Emissions: A Case Study Of Technology-Based Regulation, John D. Graham, David R. Holtgrave
RISK: Health, Safety & Environment (1990-2002)
After examining and analyzing the experience with coke ovens, the authors conclude that attempts to force technology beyond its demonstrated competence can be both expensive and ineffective in controlling hazards. They also suggest implications for pending proposals to further control air pollution.
Color-Rendering Of Daylight From Water-Filled Light Pipes, Florida Solar Energy Center, Ross Mccluney
Color-Rendering Of Daylight From Water-Filled Light Pipes, Florida Solar Energy Center, Ross Mccluney
FSEC Energy Research Center®
Water-filled light pipes can be used to transport concentrated beam solar radiation from a solar collection system to a utilization system, altering the spectral distribution of the radiation in a beneficial way in the process. One use for such a system would be for the daylighting of the core interior spaces of buildings, spaces that are far removed from outside walls or the roof and are therefore not amenable to conventional daylighting with sidelights or toplights. The filtering action of the water can be used to remove unwanted infrared and ultraviolet radiation while affecting the visible portion of the radiation …
Parallel Implementation Of A Recursive Least Squares Neural Network Training Method On The Intel Ipsc/2, James Edward Steck, Bruce M. Mcmillin, K. Krishnamurthy, M. Reza Ashouri, Gary G. Leininger
Parallel Implementation Of A Recursive Least Squares Neural Network Training Method On The Intel Ipsc/2, James Edward Steck, Bruce M. Mcmillin, K. Krishnamurthy, M. Reza Ashouri, Gary G. Leininger
Computer Science Faculty Research & Creative Works
An algorithm based on the Marquardt-Levenberg least-square optimization method has been shown by S. Kollias and D. Anastassiou (IEEE Trans. on Circuits Syst. vol.36, no.8, p.1092-101, Aug. 1989) to be a much more efficient training method than gradient descent, when applied to some small feedforward neural networks. Yet, for many applications, the increase in computational complexity of the method outweighs any gain in learning rate obtained over current training methods. However, the least-squares method can be more efficiently implemented on parallel architectures than standard methods. This is demonstrated by comparing computation times and learning rates for the least-squares method implemented …
A Comparative Study Of Edge Detection Techniques, Jaskaran Singh Dhaliwal
A Comparative Study Of Edge Detection Techniques, Jaskaran Singh Dhaliwal
Theses
The problem of detecting edges in gray level digital images is considered. A literature survey of the existing methods is presented. Based on the survey, two methods that are well accepted by a majority of investigators are identified. The methods selected are: 1) Laplacian of Gaussian (LoG) operator, and 2) An optimal detector based on maxima in gradient magnitude of a Gaussian-smoothed image. The latter has been proposed by Canny[], and will be referred as Canny's method. The purpose of the thesis is to compare the performance of these popular methods. In order to increase the scope of such comparison, …
Simulation Of Random Packing Of Hard Spheres Using Monte Carlo Method, Sung-Ho Park
Simulation Of Random Packing Of Hard Spheres Using Monte Carlo Method, Sung-Ho Park
Theses
A computer based method of generating a random packing of hard spheres is described. Using a Monte Carlo method as employed in the field of Computational Statistical Physics, packing of hard spheres are generated and analyzed.
The mean packing fractions for the present assemblies of 1000 spheres are 0.555±0.015 after pouring and 0.582±0.018 after 10 cycles of shaking. These values are approximately 5 to 6 per cent lower than the experimental results of G.D. Scott[30], but similar with the result of Visscher & Bolsterli [17].
The mean coordination numbers are 5.97 and 6.33 for the pouring and shaking case, respectively. …
An Investigation Of The Dynamics Of Abrasive Waterjet Formation, Md. Ekramul Hasan Khan
An Investigation Of The Dynamics Of Abrasive Waterjet Formation, Md. Ekramul Hasan Khan
Theses
The aim of this research was to investigate the jet formation and the jet behavior, as characterized by the velocity field, the force exerted by the jet on a work-piece and the jet geometry. The velocity and force distributions were measured using a laser transit anemometer (LTA) and a piezoelectric force transducer (PFT) respectively for constant water pressure (334.6 MPa) supply. The jet structure and its instantaneous behavior were visualized by the used of high speed filming. LTA and PFT measuring techniques were established and verified. The measurements were performed under different operating conditions. It was found that at a …
Statistical Process Control For High Precision Deep Drawn Sheet Metal Parts, Sunil S. Shah
Statistical Process Control For High Precision Deep Drawn Sheet Metal Parts, Sunil S. Shah
Theses
In today's world, industrial expertise has come to be judged in terms of the quality of the product. Good quality has become the ultimate aim in a manufacturing environment, which leads to many innovations for ease in the inspection of parts. In considering a metal working company like Hudson Tool & Die Company, a study of the various operations and the application of Statistical Process Control to the forming operations is performed using STORM software. Important characteristics have been carefully studied with regards to metal forming like uniform metal thickness, radius of the bend, depth of the drawing operation. In-depth …
A Suggested Model Program For Cim Education, Sema E. Alptekin
A Suggested Model Program For Cim Education, Sema E. Alptekin
Industrial and Manufacturing Engineering
No abstract provided.
Adaptive Scheduling And Control Using Artificial Neural Networks And Expert Systems For A Hierarchical/Distributed Fms Architecture, Luis Carlos Rabelo, Sema E. Alptekin
Adaptive Scheduling And Control Using Artificial Neural Networks And Expert Systems For A Hierarchical/Distributed Fms Architecture, Luis Carlos Rabelo, Sema E. Alptekin
Industrial and Manufacturing Engineering
An adaptive expert scheduler was developed that learns by itself and adapts to the dynamic FMS environment. This hybrid system uses a symbiotic architecture composed of expert systems (ESs) and artificial neural networks (ANNs) and provides a learning scheme guided by past experience. The artificial neural networks recognize patterns in the tasks to be solved in order to select the best scheduling rule according to different criteria. The expert systems, on the other hand, drive the inference strategy and interpret the constraints and restrictions imposed by the upper levels of the control hierarchy of the flexible manufacturing system. The level …
Thermohydrodynamic Analysis Of A Boiling Water Reactor, Nahed Youssef Morcos
Thermohydrodynamic Analysis Of A Boiling Water Reactor, Nahed Youssef Morcos
Archived Theses and Dissertations
No abstract provided.
Thermoelastic Problems Of Multilayered Cylinders, Victor Birman
Thermoelastic Problems Of Multilayered Cylinders, Victor Birman
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Thermoelastic problems of long multilayered cylinders manufactured from isotropic materials are considered. The steady-state thermal field corresponding to a constant difference between temperature outside and inside the assembly is used in the analysis. Both the case of a hollow cylinder and that of a solid multilayered assembly are discussed. A closed-form exact solution is shown for an arbitrary number of layers if the properties of constituent materials remain unaffected by temperature. Various strategies leading to an analytical solution are proposed for the case where material properties depend on temperature. The stresses in a dual-coated optical fiber subject to a uniform …