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Southeast
Region XI
Abstracts From the
2004 Regional Technical Conference (RTC)
April
2-4, 2004 - Mobile, Alabama
ABSTRACTS
PORTABLE
BRAILLE COMPUTER INTERFACE
Melissa M. Morris, Department of
Mechanical Engineering, Florida Atlantic University
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A conceptual overview of an improved system that allows visually-impaired people
to read and interact with webpages and other computer applications on a refreshable,
multi-line display is presented. Several ideas using electroactive polymers (EAPs)
and shape memory alloys (SMAs) which are currently under research are discussed.
The goal will be to fully develop and construct a working product. Ideally, this
improved system will be more portable, user-friendly, and less expensive than
current technologies. In addition, visually-impaired users will be able to better
perform word-processing and web-based research. Sy
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DEVELOPMENT
OF A FORCE-REFLECTING MANUAL CONTROLLER PROTOTYPE FOR TELEOPERATION
Chandrasekar
Reddy Puligari * , Mehmet Ismet Can Dede * , Sabri Tosunoglu * , and Daniel W.
Repperger **
* Florida International University ** Air Force Research Laboratory
Wright Patterson Air Force Base
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robotics research program at Florida International University develops a broad
range of robotic systems with a level of capability and robustness that supports
long term, applied field operations. This paper provides insight into the design
of a 1-Degree of Freedom (DOF) force-reflecting manual controller (FRMC) for the
development of a teleoperation system by reviewing the wave variables technique,
position/force control algorithms, platform design, servo systems, servo controllers
and the related software developed.
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DESIGN
OF A HIGH PERFORMANCE 3-D MICRO CONVECTIVE HEAT SINK FOR THERMAL MANAGEMENT OF
CERAMIC-BASED SUBSTRATE MULTICHIP MODULES
R. Moreno and Y.-X. Tao Department of Mechanical and Materials Engineering,
Florida International University
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The
method used to design a high performance 3-D heat sink for thermal management
of ceramic-based substrate multichip modules is presented. The constructal method
and Murray's Law are used to design a nearly fractal, 3-D micro-convective heat
sink with a shape that minimizes thermal and flow resistances. The optimal shape
predicted by the constructal method for LTCC, HTCC, and Thick Film ceramic-based
substrates is determined and an optimal range of shapes that can be used for all
three types is obtained. A method of manufacturing that allows the heat sink to
be embedded within the ceramic substrate is also described. |
OPTIMIZATION
OF SURFACE MICROMACHINED TWO-ARM HORIZONTAL ELECTRO-THERMAL ACTUATORS
Amarendra P Atre, Department of Mechanical Engineering, Georgia Institute
of Technology
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Electro-thermal,
two-arm polysilicon actuators are widely employed in optical MEMS applications.
These actuators are typically designed for maximum deflection (unloaded) or force
(loaded) output characteristics. The optimal design methodology of the actuator
has been investigated previously using trial and error analytical and semi-analytical
methods. In this paper, design optimization of the electro-thermal actuator is
attempted by a multi-variable non-linear comprehensive finite element analysis.
The optimization subroutine is implemented to investigate and compare the performance
of the actuator by adjusting the design variables to obtain an actuator geometry
that provides optimum deflection or force output for minimal power consumption.
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DESIGN
AND ANALYSIS OF HIGH-SPEED SPINDLES FOR NANO-MACHINING APPLICATIONS USING COMPUTATIONAL
FLUID DYNAMICS APPROACH
Kalyana C. Kanjarkar-Graduate Student, Dr. Jie Cui-Assistant Professor, Dr. Mark
Jackson-Associate Professor, Department of Mechanical Engineering, Tennessee Technological
University
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Rotors
in High-Speed Spindles cause the spindle to rotate faster and to generate high
material removal rate. High-pressure variation on the rotor surface causes the
rotor's breakdown and this severely limits the reliability and durability of the
high-speed spindles to support new developments in micro and nanomanufacturing
technologies. In this paper, different designs of rotor were proposed and optimum
design was chosen based on the lowest pressure variation on the rotor surfaces.
Numerical simulations were carried out using CFX. The results revealed that changes
in the rotor, inlet and outlet geometries affect the pressure coefficient significantly.
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DESIGN
TEMPERATURE DATA FOR SURFACE WATER HEATING AND COOLING SYSTEMS
Barbara G. Hattemer, University of Alabama, Tuscaloosa, Alabama Stephen P.
Kavanaugh, Ph.D., University of Alabama, Tuscaloosa
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This
paper provides an overview of the current design prodecures of surface water heat
pump (SWHP) and direct cooling systems with an emphasis on the key role of water
temperature data in the design process. The paper gives an overview of the current
information on SWHP systems readily available to HVAC design engineers. An overview
of the temperature data collection process is discussed. Specific temperature
plots are given from different regions of the country to show how water temperature
changes with depth and season in those regions. In addition, the environmental
impact of SWHP systems is discussed. |
ELECTRONIC
COOLING OF AN ELECTRONICALLY PACKAGED SYSTEM USING HEAT PIPES
Jaideep Bangal and Tyrus McCarty, Department of Mechanical Engineering, University
of Mississippi
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Temperature
increase is becoming an extremely significant area in the thermal management of
electronics. In order to maximize circuit performance and reliability, it is necessary
to design and package electronic assemblies to minimize heat generation and circuit
temperature by employing adequate thermal management methods. In this study the
analysis involved the thermal management of an electronically packaged (EP) system,
utilizing heat pipe technology for cooling the electronic components. The heat
pipe, with an extremely high effective thermal conductivity, transports heat away
from the components to a heat sink where it is dissipated into the surrounding
air. In this study, a computer simulation of the heat transfer in an EP system
is performed to predict the effectiveness of several specified designs using the
IcePak software package. One of the basic objectives of the present work is to
predict the maximum temperature of the power amplifier chips under steady-state
conditions. The simulation is carried out at different environmental operating
conditions and at different power settings for the power amplifier chips. The
results of this study provide several effective ways of insuring that the electronic
components are operated in a failure-safe environment. |
RESONANT
FREQUENCIES AND MODAL DEFORMATION OF EMBEDDED DISCS IN PLASTIC ARENA BOARDS FOR
FIRE ANT RESPONSE STUDIES
Prakash Jadhav, Graduate Student; , Esther M. Mwangi Graduate Student; P.
Raju Mantena, Professor of Mech. Engr., - University of Mississippi and
Lay
Menn Khoo, Associate R&D Engineer. NCPA | |
The
behavior of fire ant colonies when subjected to vibration stimulation is investigated
using plastic arena boards, with embedded circular discs. This paper describes
experimental modal analysis and finite element methods for determining the resonant
frequencies and modal deformation patterns of the embedded plastic disc for facilitating
fire ant response studies. Colonies of fire ants were placed within these enclosed
discs, which were then excited at their resonant frequencies using electromagnetic
excitation. Observations of the fire ant behavior and locations, before and after
excitation, were recorded. Distance the ants moved, surface displacement, velocity
and acceleration were also measured. |
Pool-Playing
Robot Design Project
Justin
Williams - England, Thims & Miller
Warren A. Wider and Daniel J. Cox -
University of North Florida
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This paper describes design effort results of a Senior Capstone Design Project
in Mechanical Engineering. A leading manufacturer of pool cues needs a repeatable
device to shoot pool cues in order to demonstrate cue performance. A robot is
designed for two primary objectives, to test the performance of pool cues, and
to compare the performance of one cue over another. The latter objective is to
occur in a demonstration setting, thus the sponsor desires features for a robot
similar in scale to a human shooting a pool cue at a pool table. The robot has
been designed as a Senior Capstone Design Project with four main subsystems. Design
aspects of the structure subsystem, shooting-arm subsystem, grip and bridge subsystem,
and the computer control subsystem and their subsequent design integration is
described.
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VISCOELASTIC
FINITE ELEMENT ANALYSIS OF HUMAN PATELLAR TENDON
C.
Machiraju, A.-V.Phan, A.W.Pearsall, J.M.Hollis, S.Madanagopal,
University of South Alabama | |
This
paper presents an approach based upon a Maxwell's model of viscoelastic materials
to performing a finite element analysis of the human patellar tendon using the
finite element package ANSYS. The approach is general and thus, can be applied
to analyze the viscoelastic behavior of other tendons such as the human supraspinatus
tendon providing that experimental data for the material creep and stress relaxation
tests are available. |
REVIEW
OF MANUFACTURING FUNCTIONALLY GRADED MATERIALS
Chymar Myint, Kuang-Ting Hsiao, Bob Minaie, University of South Alabama | |
This
paper reviews the current status of fabricating functionally graded materials
and the processing methods. The uses of functionally graded materials in biomedical
and electrical applications are discussed. Then, the processing method for fabricating
functionally graded materials using impregnation method for potential electrical
applications is discussed. The final gradient in this impregnation method is controlled
by varying the tension in the fiber, the speed of the rollers, and the number
of rollers. |
PRELIMINARY
STUDY AND IMPLEMENTATION OF ADAPTIVE CONTROL FOR RESIN TRANSFER MOLDING
O. Restrepo, K.T. Hsiao, S. Jiang, B. Minaie - University of South Alabama | |
A control strategy has been implemented and the visualization interface has been
created to control the Resin Transfer Molding (RTM) process for a thin-walled
mold with multiple inlet gates. The system was engineered to control a single
parameter, which can be inlet pressure or flow rate at each inlet gate. Simplified
analytical models were implemented with the computer controlled RTM simulation
to evaluate the flow controllability of the proposed control strategy. The controllability
of the process was tested for different permeability distributions within the
mold. The comparison between the flow control and pressure control techniques
is presented in this paper. y
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ANALYSIS
OF FILLING PATTERN IN RESIN TRANSFER MOLDING
Ravi K. Panitapu, Shunliang Jiang, Bob Minaie - University of South Alabama | |
This
paper presents the simulation of the filling pattern in Resin Transfer Molding
(RTM) under isothermal conditions. Discretization of the domain is performed using
the control volume finite difference procedure with implicit scheme. The capability
to predict the Last Point to Fill (LPF) location is given by different examples.
Factors that affect the filling process such as permeability of preform, race
tracking and injection gate locations are taken into consideration in the simulation
model. |
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