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Health Monitoring for Damage Initiation & Progression During Mechanical Shock in Electronic Assemblies
(2009-02-23)
Electronic products may be subjected to shock and vibration during shipping, normal usage and accidental drop. Highstrain rate transient bending produced by such loads may result in failure of fine-pitch electronics. Current ...
Heuristic Optimization Methods for the Characterization of Dynamic Mechanical Properties of Composite Materials
(2009-02-23)
Generally speaking, of the fundamental dynamic mechanical properties - mass, damping, and stiffness, damping is usually the most difficult to quantify. This is perhaps particularly true for composite materials which tend ...
Static, Dynamic and Acoustical Properties of Sandwich Composite Materials
(2009-02-23)
Sandwich composite materials have been widely used in recent years for the construction of spacecraft, aircraft, and ships, mainly because of their high stiffness-to-weight ratios and the introduction of a viscoelastic ...
Damage Prediction of Lead Free Ball Grid Array Packages Under Shock and Drop Environment
(2008-09-09)
The fatigue and damage of solder joints and also the potential for interface failure within BGA packages are caused by thermal cycling. In case of portable electronic products, fatigue is caused by repetitive drop and shock ...
Design and Analysis of Air and Coolant Control for a Polymer Electrolyte Membrane Fuel Cell
(2008-09-09)
The polymer electrolyte membrane (PEM) fuel cell is an alternative engine that can potentially replace the internal combustion engine in the vehicles of the future. When hydrogen, stored in a tank, and oxygen, from the ...
Some Techniques in the Control of Dynamic Systems with Periodically Varying Coefficients
(2009-02-23)
The goal of this dissertation is to develop control system design methods for dynamic systems with time periodic coefficients. These systems arise naturally in many branches of science and engineering. As a rule, time ...
Investigation of Lateral Performance of an ATV Tire on Natural, Deformable Surfaces
(2009-02-23)
A study is undertaken to discover links between soil-rubber interface strength,
camber, pressure and lateral performance of a front ATV tire. New tire and soil test rigs
are also designed and fabricated for the support ...
A Machine Vision and Sensing System for Braid Defect Detection, Diagnosis and Prevention During Manufacture
(2009-02-23)
The mechanical properties of braids are often quite convenient for achieving the high performance levels expected of composite materials. A favorable attribute of a braided structure is the ability for the design engineer ...
Modeling Simulation and Preliminary Experimentation on Towed Tether System
(2009-02-23)
Aero-dynamic drag forces and their effect on the path taken by a cable in a towed system are studied with the aid of an advanced computational software packages. A piece of rope (tether) is towed at the top end in a ...
Studies of the Off-Resonant Nonlinear Optical Properties of an Organic Molecular Crystal and Specific Nonconjugated Conductive Polymers
(2009-02-23)
In this dissertation, the second order nonlinear optical properties of an organic molecular crystal and the third order off-resonant nonlinear optical properties of specific nonconjugated conductive polymers have been ...