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University of Arkansas, Fayetteville

Mechanical Engineering Undergraduate Honors Theses

2013

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Design And Construction Of An Experiment For The Investigation Of The Effects Of Gust On Flapping Wing Micro Air Vehicle Power Consumption, Brett Hiller May 2013

Design And Construction Of An Experiment For The Investigation Of The Effects Of Gust On Flapping Wing Micro Air Vehicle Power Consumption, Brett Hiller

Mechanical Engineering Undergraduate Honors Theses

In recent years, the promising nature of flapping wing flight has led researchers to investigate the wing morphology and unsteady wing aerodynamics found in insects to aid in the design of modern micro air vehicles (MAVs). A high-fidelity flapping wing MAV could achieve high mobility, hovering stability, increased stealth, and efficient flight at low speeds. These characteristics offer a viable solution to the operational requirements for the typical hazardous and dynamic environments encountered during flight. While the kinematics and morphology of flapping wings are well-understood, significant research has yet to be completed with respect to the control and power requirements …


Optimization Of Automated Temperature Measurement System For Formed Meat Products, Tyler Norman May 2013

Optimization Of Automated Temperature Measurement System For Formed Meat Products, Tyler Norman

Mechanical Engineering Undergraduate Honors Theses

The Federal Safety and Inspection Services in accordance with United States Department of Agriculture require that formed meat products be cooked to a specified minimum internal temperature in order to eliminate the possible presence of harmful bacteria. The current system of verifying the internal temperatures of formed meat products consists of manually inserting a temperature probe into the selected sample as it exits the oven. Creating an automated system that measures and records the internal temperatures of formed meat samples as they exit the oven along a meat processing line has been the topic of an ongoing research. The most …


Exploration Into Properties Of Molybdenum Disulfide Using Atomistic Simulation, Joseph Simpson May 2013

Exploration Into Properties Of Molybdenum Disulfide Using Atomistic Simulation, Joseph Simpson

Mechanical Engineering Undergraduate Honors Theses

Molybdenum disulfide (MoS2) has a lamellar crystal structure, which makes it ideal for use as a solid lubricant. Transmission electron microscope (TEM) images have shown that line defects exist within the lattice of mechanically deformed MoS2, but the physical mechanisms which lead to the formation of these defects are unknown. The two central objectives of this research are to use molecular dynamics simulations to study the effects of tensile deformation on both single layer and bulk MoS2 and explore the properties of line defects in an otherwise perfect lattice of MoS2. Under tensile loading, molecular dynamics simulations show a multi-stage …


Molecular Dynamics Simulations Of Plastic Deformation In Dopant-Modified Nanocrystalline Metallic Materials, Lucas Brown May 2013

Molecular Dynamics Simulations Of Plastic Deformation In Dopant-Modified Nanocrystalline Metallic Materials, Lucas Brown

Mechanical Engineering Undergraduate Honors Theses

Polycrystalline metallic materials commonly exhibit the Hall-Petch relationship, which states that decreased grain size leads to increased strength. As a result, nanocrystalline metals, which are defined as polycrystalline metals with average grain diameters on the nanoscale, exhibit ultra-high strength phenomenon. Despite their incredible strength, the applications of these materials are severely limited due to thermodynamic instability that causes low temperature grain growth and a reduction in the enhanced properties. It is known that dopant atoms located at the grain boundaries in nanocrystalline metals can reduce this effect and stabilize the microstructure of these materials, but little is known about the …


Bicycle Frame Shape And The Effect On Performance, Connor Mcwilliams May 2013

Bicycle Frame Shape And The Effect On Performance, Connor Mcwilliams

Mechanical Engineering Undergraduate Honors Theses

A computational fluid dynamic (CFD) study of the Trek KVF frame shape and how this effects overall performance.


Computational Tire Models And Their Effectiveness, Andrew Wheeler May 2013

Computational Tire Models And Their Effectiveness, Andrew Wheeler

Mechanical Engineering Undergraduate Honors Theses

This paper describes the advantages, disadvantages, and complications that arise during the modeling, simulation, and analysis of tire models using MSC’s Adams/Car software. Due to the complexity of the testing, this paper was limited to a handful of tests. This included putting a template Formula SAE vehicle through simulations on a constant radius skidpad, performing a high stress longitudinal acceleration, a fish-hook maneuver, and a step-steer maneuver. These tests were analyzed and compared to current understandings of the model’s accuracy and validity. Of the six different models tested, the FTire model proved to be the best performing. The main Pacejka …