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Articles 1 - 14 of 14
Full-Text Articles in Mechanical Engineering
Corrosion Assessment Of Biodegradable Metal Implants For Orthopedic Applications, Wendy B. Reynoso-Diaz
Corrosion Assessment Of Biodegradable Metal Implants For Orthopedic Applications, Wendy B. Reynoso-Diaz
Honors Theses
Magnesium alloys are the most promising materials to be used as biodegradable implants mainly due to their superior biocompatibility and lower specific density compared to other biodegradable metals (i.e., zinc and iron-based alloys). This study is investigating the effect of two different manufacturing methods and purity levels on the corrosion rates of a novel Mg-Zn-Ca-Mn-based alloy. Experimental in vitro corrosion tests were conducted on the biocompatible Mg-Zn-Ca-Mn-based alloy fabricated using conventional casting and hot rolling with low and high purity levels. The experimental research conducted, assessed the corrosion rates of the following Mg-1.2Zn-0.5Ca-0.5Mn-based alloys: Hot Rolled High Purity, As-Cast High …
Multistage Modeling Of Fatigue Of Ti-6al-4v Fabricated By Different Additive Manufacturing Techniques, Lionardo Lado, Saeed Ataollahi, Mohammad J. Mahtabi
Multistage Modeling Of Fatigue Of Ti-6al-4v Fabricated By Different Additive Manufacturing Techniques, Lionardo Lado, Saeed Ataollahi, Mohammad J. Mahtabi
Honors Theses
Thanks to its high strength-to-weight ratio and corrosion resistance, Ti-6Al-4V has gained a lot of attention in additive manufacturing (AM) of complex parts with aerospace and medical applications. The realistic loading condition in these applications is mostly cyclic. However, the main challenge with AM of this alloy - and in general AM of metallic parts - is fatigue resistance and durability of the part, which has been reported to be much lower than the conventional materials. In this study, fatigue life performance of three additive manufacturing methods was compared using the Multistage Fatigue model (MSF). MSF model predicts the fatigue …
Gasification Based Waste Tire Integrated Energy Conversion Systems, Karah Powell
Gasification Based Waste Tire Integrated Energy Conversion Systems, Karah Powell
Honors Theses
The objective of this study was to evaluate the operating parameters impacts on the performance of a gasification-based waste tire integrated energy conversion system. In this system, the waste tires are put into a downdraft gasifier that is providing fuel for a solid oxide fuel cell (SOFC). The system is evaluated by the syngas production, power generation, and overall efficiency under various operating conditions. A hybrid 1-D model was adopted to perform a parametric study of the tire gasification and calculations were done to estimate the integrated system power generation and overall efficiency using MATLAB. Three parameters were studied: the …
Mathematical Modeling Of A Variable Mass Rocket’S Dynamics Using The Differential Transform Method, Ashwyn Sam
Mathematical Modeling Of A Variable Mass Rocket’S Dynamics Using The Differential Transform Method, Ashwyn Sam
Honors Theses
In this paper, the mathematical modelling of a rocket with varying mass is investigated to construct a function that can describe the velocity and position of the rocket as a function of time. This research is geared more towards small scale rockets where the nonlinear drag term is of great interest to the underlying dynamics of the rocket. A simple force balance on the rocket using Newton’s second law of motion yields a Riccati differential equation for which the solution yields the velocity of the rocket at any given time. This solution can then be integrated with respect to time …
Analysis And Proposed Improvement Of Hamilton County Vw Elab Equipment, Hiroshi Yanagida
Analysis And Proposed Improvement Of Hamilton County Vw Elab Equipment, Hiroshi Yanagida
Honors Theses
Digital fabrication laboratories have revolutionized project based learning within K-12 STEAM education curriculum. However, classroom utilization of the labs often requires excessive machine hours to accomplish, and this often leads to rapid machine depreciation and disrepair. Many educators do not have the time to repair their equipment while developing curriculum and engaging with their students. This study focuses on building a repair history for common digital fabrication equipment, which includes Prusa i3 Mk2S FDM 3D printers, laser cutters, and CNC routers. Data were collected over a 6 month period to find which machines encountered the most issues. The 3D printers …
The Analysis Of Erlanger Hospital’S Suture Inventory Management Operations, Amanda George
The Analysis Of Erlanger Hospital’S Suture Inventory Management Operations, Amanda George
Honors Theses
This paper evaluates the impact of using mechanical engineering and operations management principles to an inventory management system in Erlanger Hospital. Erlanger Hospital is a local, nonprofit hospital system in Chattanooga. Erlanger serves as a tertiary referral hospital and a Level I Trauma Center in the region. Therefore, they are heavily depended on during times of crisis or emergency [2]. This study focuses specifically on reducing the loss and ultimate waste of sutures across Erlanger’s surgery wing. A criteria for the appraisal of using mechanical and manufacturing engineering to improve the current system is established based on existing data regarding …
Computational Simulation Of The Paw-04 Nozzle Configuration, Juan Hernandez
Computational Simulation Of The Paw-04 Nozzle Configuration, Juan Hernandez
Honors Theses
The research was based on the 4th Propulsion Aerodynamics Workshop which was organized by the American Institute of Aeronautics and Astronautics (AIAA) Air Breathing Propulsion System Integration Technical Committee and its objective was to assess the accuracy and numerical prediction capabilities of Computational Fluid Dynamics (CFD). It focused on the work of Behrouzi and McGuirk where they tested two different nozzle configurations under set boundary conditions. The nozzle configurations included a high aspect ratio rectangular nozzle with a clean exit and the same nozzle with an aft-deck attached to the exit. Three different unstructured grids were generated for the clean …
The Effect Of Soil Saturation On The Heat Transfer Rate In A Controlled Environment For Application To Ground Source Heat Pumps, William Barnard
The Effect Of Soil Saturation On The Heat Transfer Rate In A Controlled Environment For Application To Ground Source Heat Pumps, William Barnard
Honors Theses
With the worldwide push for environmentally friendly technology, the topic of geothermal systems has only become more important. Ground Source Heat Pumps (GSHPs) are heat pumps that take advantage of the natural temperature difference between the soil and the air to decrease the amount of power necessary to heat an area. A GSHP has been shown to be capable of increasing efficiency by 3 or 4 times the amount of a conventional heating and cooling system [4]. To take advantage of the full capabilities of a GSHP, one needs to understand what factors can increase or decrease efficiency. While research …
Energy Sustainability Analysis Of A Baja Test Facility, Seth Bishop
Energy Sustainability Analysis Of A Baja Test Facility, Seth Bishop
Honors Theses
The objective of this paper is to study the viability of building a Baja SAE competition site so that UTC could host events in the future. Part of this includes defining a building size in square feet and estimating the construction cost. Once that is accomplished it is necessary to determine what equipment may be used at the site, how much power each piece of equipment would use, and how many hours each would be used for within the year. With this information it is then possible to estimate the annual power consumption for a competition year and a regular …
Improving Alternative Fuel Efficiency With Water Injection, Connor Strawn
Improving Alternative Fuel Efficiency With Water Injection, Connor Strawn
Honors Theses
Alternative fuel internal combustion engines (ICEs) have been increasing in popularity as the harmful effects of pollution and the need for a sustainable energy source are becoming more apparent. Two alternative fuels, E85 and hydrogen gas, are considered in this study. These fuels are renewable and have less emissions than traditional fuels, but there are many inherent disadvantages to their use. Water injection could alleviate some of the issues that plague these fuels. To test this, a Briggs and Stratton Baja engine was used, with and without water injection. Gasoline with water injection showed better performance than without: the power …
Design Of A Pneumatic Conveying Test Loop For Laboratory Testing, Natalie Burdine
Design Of A Pneumatic Conveying Test Loop For Laboratory Testing, Natalie Burdine
Honors Theses
Pneumatic conveying is the transportation of material through a closed conveying line in a gas medium via a pressure differential. In industry, pneumatic conveying is used extensively to handle materials: specifically, bulk solids and powders. 80% of all transported materials are bulk solids and pneumatic conveying is currently experiencing industry growth at a rate of 6.4% annually. Industrial pneumatic conveyor suppliers use specialized testing systems to make design decisions regarding specific applications, taking into account the conveyed material, the structure of the plant in which the system will be installed, and desired system characteristics such as necessary filtering or safety …
Creating A Zero + Energy Building Model, Ashley N. Thompson
Creating A Zero + Energy Building Model, Ashley N. Thompson
Honors Theses
The goal of this project was to create an accurate representation of a zero + energy home both for physical experimentation and for numerical modeling. This means that the home does not rely on power from the grid, but only on alternative energy sources such as solar. The project consists of two major subcategories. The electrical portion of the project consists of implementing the energy source and control system, and the mechanical portion of the project consists of thermal analysis, thermal flow simulations, and physical construction. A 50 W solar panel was chosen as an energy source, which directs power …
Determining Energy Output In Manual And Automated Solar Arrays, James K. Ayres
Determining Energy Output In Manual And Automated Solar Arrays, James K. Ayres
Honors Theses
The scope for the project was to design and construct a system that could be used to both manually and automatically track the sun using solar panels to demonstrate engineering principles for classroom and laboratory experiments at both the primary and secondary education levels. For ease of demonstration, a manual and automatic tracker was designed for the experiment. Using a standard camera tripod, the solar panels were attached to fabricated mounts to allow for omnidirectional movement. For the automated, or active tracker, an Ardunio Uno microcontroller was used in conjunction with two 180˚ servos to adjust the active tracker solar …
Examination Of Heat Flux Through A Surface Using Digital Image Processing Of Infrared Images, Nicholas D. True
Examination Of Heat Flux Through A Surface Using Digital Image Processing Of Infrared Images, Nicholas D. True
Honors Theses
The task for this project was to design and construct a system that could be used to examine heat transfer through a surface by analyzing images produced using thermal imaging cameras. A long rectangular box made of pinewood was constructed and a light bulb was inserted to provide a heating element. The front face of the box was made to be interchangeable so that various materials could be tested. Two Flir I5 thermal imaging cameras were used to take pictures of both sides of the front face at specific time intervals in order to determine the temperature distribution of the …