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Articles 1 - 11 of 11
Full-Text Articles in Engineering
Subthreshold 3 Phase Mixers, Jesus Angel Torres
Subthreshold 3 Phase Mixers, Jesus Angel Torres
Theses and Dissertations - UTB/UTPA
This thesis will discuss subthreshold FET mixers with a focus on conversion loss derivations. To begin understanding the mixers, a look into the FET model is first taken in Chapter II. Then in Chapter III, a single FET device mixer is studied and its conversion loss is found from its small-signal model. The chapter will then include a two FET device mixer and a four device FET mixer. Finally a new type of mixer will be discussed in Chapter IV. The new type of mixer is a 3 phase mixer with the phase angles being 0°, 120°, and 240°. The …
An Investigation Into Temperature Trending In Railroad Tapered Roller Bearings Through Vibration Monitoring Techniques, Rafael Kristian Maldonado
An Investigation Into Temperature Trending In Railroad Tapered Roller Bearings Through Vibration Monitoring Techniques, Rafael Kristian Maldonado
Theses and Dissertations - UTB/UTPA
A series of laboratory experiments have been conducted at The University of Texas-Pan American to investigate the cause of bearing “temperature trending.” A combination of theoretical and experimental studies has identified potential sources for the abrupt changes in temperature often seen in railroad bearings. Previous studies suggest the possibility of vibration induced roller misalignment as the root cause for temperature trending. Subsequent research conducted by the UTPA team was designed to provide evidence through vibration monitoring techniques for the proposed hypothesis. To that end, a dynamic bearing tester was used to run four bearings at various speeds and loads experienced …
The Role Of Thermally-Induced Geometrical Changes In Temperature Trending Of Railroad Tapered Roller Bearings, Andrei G. Vaipan
The Role Of Thermally-Induced Geometrical Changes In Temperature Trending Of Railroad Tapered Roller Bearings, Andrei G. Vaipan
Theses and Dissertations - UTB/UTPA
The understanding of the phenomenon of temperature trending of railroad tapered roller bearings is of paramount importance to the railroad industry. The problem that this poses to the industry is that it leads to false alarms triggered by wayside detectors, which forces the premature removal of defect-free bearings. This thesis provides more insight into this phenomenon and answers questions regarding the importance of key tapered roller bearing components geometry and geometrical changes during temperature trending events. In this study, dynamic experiments conducted in the laboratory have represented the primary method of testing bearing temperature trending. The experimental results are brought …
The Evaluation And Analysis Of The Impact Of Variability On The Twelve Workstation Factory, Hernando Garrido
The Evaluation And Analysis Of The Impact Of Variability On The Twelve Workstation Factory, Hernando Garrido
Theses and Dissertations - UTB/UTPA
Presently, there is theory and work examples about factory performance presented in the book ―Optimizing factory Performance‖ by James Ignizio, Ph.D. The theory explains how to determine performance using three fundamental equations by considering the impact and propagation of variability through a 12-Workstation Factory Model, and a number of its variations. The objective of developing a simulation model was to serve as a tool for instructors to illustrate the impact and propagation of variability in the manufacturing industry and to investigate phenomena (i.e., time to reach steady state, impact of variability) in the three dimensions of manufacturing. The validation of …
Analysis And Design Of An Anisotropic, Compliant Suspension Component, Samantha Jean Salinas
Analysis And Design Of An Anisotropic, Compliant Suspension Component, Samantha Jean Salinas
Theses and Dissertations - UTB/UTPA
A steering pad on a train is meant to reduce the force on the wheel while moving along a curve in the rail. A new steering pad was desired with properties tuned for a new suspension system design. An anisotropic, compliant pad was designed for a specific stiffness anisotropy, 20:1. Finite element analysis was performed on various models as a guide to designing a pin with the desired stiffness ratio. A design was chosen for a prototype made of thermoset polyurethane, a similar material to that currently used. Experiments were performed on the prototype pad model to determine vertical and …
Development And Implementation Of Challenge-Based Instruction In Engineering Graphics, Gregory A. Potter
Development And Implementation Of Challenge-Based Instruction In Engineering Graphics, Gregory A. Potter
Theses and Dissertations - UTB/UTPA
This thesis discusses the challenge-based instructional (CBI) lessons currently being developed for the Engineering Graphics course at UTPA. This endeavor concentrates on student retention, as well as the students’ ability to practically apply their new skills. Minority science, technology, engineering, and math (STEM) students have been found, in recent studies, to depart from STEM undergraduate fields to some extent because of the lack of real world connections to the subject matter. Also, the traditional way of teaching theory first and then assigning a task may actually stifle creative thought and innovation required in later STEM courses. Our use of CBI …
Characterizing And Optimizing The Molten Salt Cleaning, Yangyang Long
Characterizing And Optimizing The Molten Salt Cleaning, Yangyang Long
Theses and Dissertations - UTB/UTPA
Molten salt cleaning is an important cleaning approach in remanufacturing which can remove a variety of contaminants from metal substrates with high efficiency. Facing the very limited research of this approach in literature, this thesis intends to characterize molten salt cleaning process and optimize its parameters when big parts with complicated shapes are cleaned. Based on the development of molten salt cleaning and studies on contaminations, two experiments are conducted. The first one investigates the influences of the hot salts on three metal substrates and shows the applicable of cleaning carbon steel and grey iron parts with molten salt. The …
Using Discrete Event Computer Simulation To Analyze The Effects Of Proposed Changes To Personnel In A Hospital Medical Laboratory, Gerardo Morales
Using Discrete Event Computer Simulation To Analyze The Effects Of Proposed Changes To Personnel In A Hospital Medical Laboratory, Gerardo Morales
Theses and Dissertations - UTB/UTPA
A discrete event computer simulation is used to model a portion of the medical laboratory at Doctors Hospital at Renaissance in order to assess the current situation as well as to review the planed personnel changes. The area under observation is the section in which the processor(s) receive, label and distribute the patient samples. There are four cases modeled in the simulation: The main focus is to determine if one or two processors are needed per shift and if the high level of phone calls poses a significant delay to the processors’ workflow. The simulation results indicate that having two …
Development Of Laboratory Based Smart Micro Grid To Be Used As An Educational Tool, Jose L. Sanchez
Development Of Laboratory Based Smart Micro Grid To Be Used As An Educational Tool, Jose L. Sanchez
Theses and Dissertations - UTB/UTPA
The increasing trend of the energy industry to move towards a new smart power grid has pushed researchers to address the challenges that this represents. Universities all around the world are also under pressure to better prepare their students to meet the challenges that await them with this new technology and techniques. The work presented on this thesis was motivated by the current need of the electrical engineering curriculum to include new material into their current courses. A laboratory based smart micro grid was created by applying several concepts and techniques currently being adopted by the energy industry to make …
Design For Soft Error Tolerance In Fpga-Implemented Asynchronous Circuits, Yu Bai
Design For Soft Error Tolerance In Fpga-Implemented Asynchronous Circuits, Yu Bai
Theses and Dissertations - UTB/UTPA
This research in its present form is the result of experimentation on effect of soft error in FPGA-implemented asynchronous circuit. The conclusion are drawn that asynchronous circuit are much easier to detect soft error than synchronous circuits. The asynchronous circuit is implemented in FPGA with software fault injection method to analyze the behavior of soft error generation in FPGA implementation asynchronous circuits. The proposed detection circuit can detect all soft errors that generated in FPGA-implemented asynchronous circuit. The contributions include: investigation of FPGA structure, investigation of soft error model in FPGA, mechanism of FPGA implemented asynchronous circuit, behavior of soft …
The Design, Development, And Optimization Of Variable And Fixed Orifice Dampers With Empirical And Experimental Testing For Implementation In The Railroad Industry, Charles K. Speck
Theses and Dissertations - UTB/UTPA
The work of this thesis details the experimental testing, development, and optimization of the spools and system of the variable orifice damper system. The fixed orifice system was developed from concept, tested, and then redesigned. The experimental testing for the orifice selection directed the optimization and final design for the fixed orifice damper system. The testing focused on the evaluation of pressure drops and flow rate for static testing. The dynamic testing evaluated the displacement rate and force loading. Design, testing, and optimization worked to achieve designed flow rates and pressure drops provided by Amsted Rail based upon simulations. When …