Alexis J. Pabst and Dr. Paul Eastman, Mechanical Engineering Introduction The Unity IV rocket is a twenty-foot tall rocket with a 16.5-inch diameter. It is a super-sonic, hybrid rocket that uses a solid propellant and liquid oxidizer. The rocket has been designed and built by students from three Utah universities. It is intended to take […]
Use of Linear Analysis of Microstructures in Defining Performance Closures for Highly Constrained Mechanical Design
Mark Lyon and Dr. Brent L. Adams, Mechanical Engineering Using methods described by Adams1, the design of a compliant beam was modeled in a multidimensional Fourier design space. A compliant beam is one that achieves motion through bending. The motivation for the problem was a bicycle derailleur. A compliant beam could replace the entire rear […]
A New Stereology
Ryan J. Larsen and Dr. Brent L. Adams, Mechanical Engineering Much research in recent years has focused on producing polycrystalline materials with high numbers of special grain boundaries. Special grain boundaries are defined as boundaries with desirable properties, such as resistance to corrosion, cracking, or precipitation. Most researchers describe grain boundary geometry only with the […]
Developing Mechanisms as LIGA Microstructures
Jordan E. Brough and Dr. Larry Howell, Mechanical Engineering Microelectromechanical Systems (MEMS) is a rapidly developing field which uses technology similar to that used to carve out the millions of tiny channels found in today’s computer processors. MEMS, however, uses this technology to make mechanical structures and mechanisms instead of electrical pathways. My effort over […]
Comparing NOx Emissions of Diesel Fuel and Oxygenated Fuels
Timothy M. Allred and Dr. Dale R. Tree, Mechanical Engineering The emissions produced by both passenger and commercial vehicles are a significant contributor to pollution problems that face many cities and areas around the world. One of these pollutants is known as NOx, which refers to the chemical compounds NO2 and NO. These gases are […]
Design of Equipment to Test Compliant Centrifugal Clutches
Nathan B. Crane and Dr. Larry L. Howell, Mechanical Engineering A compliant mechanism is a mechanism in which some or all motion comes from deflection of its members. Several years ago, a one piece centrifugal clutch based on a compliant mechanism was developed and implemented in several products. It offers many cost and assembly advantages […]
The Developing Length of Electro-osmotic Flow
Joseph Scott Tenny and Dr. Daniel Maynes, Mechanical Enineering Introduction Recent advancements in technology have created the need for increased understanding of fluid flow in microtubes with a diameter of a 100μm or less. These types of flows can occur in many practical applications, one of which is a concept proposed for DNA analysis called […]
The Effects of Tool and Temperature Parameters on Grain Growth in Friction Stir Welded 7050 and 7475 Aluminum
Kevin Allen Schwendiman and Drs. Tracy Nelson and Carl Sorenson, Mechanical Engineering The Welding Institute (TWI) in Cambridge, England invented friction stir welding (FSW) late in 1991. TWI applied in December of that year for worldwide patent protection. The friction stir welding process is simple, energy-efficient and inexpensive relative to other welding methods. FSW can […]
Low Reynolds Number Aerodynamics for Micro Air-Vehicles (MAV)
Paul Nelson, Chad LeBaron, Bart Frischknecht, Kristopher Danielson and Jerry Bowman, Mechanical Engineering Very little aerodynamic data exists for Reynolds numbers less than 100,000. It is common for there to be a large discrepancy between numerically predicted and experimental airfoil performance, especially at very low Reynolds numbers. In this research, a low Reynolds number airfoil […]
Computer Simulation of Microstructures Based on Two-point Correlation Functions
Benjamin L. Hansen and Dr. Brent Adams, Mechanical Engineering A great amount of variance exists in the properties of any material. The ability to accurately predict these properties allows for designers to find the “best” material in highly constrained design situations. Many properties, such as elasticity and conductivity, are relatively insensitive to grain boundary interfaces […]
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