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Nonlinear Aeroelastic Behavior of Tail / Rudder Systems with Freeplay and Actuator Failure
This thesis discusses the development of numerical simulations implemented in MATLAB and of an experimental tail/rudder model for the investigation of the effects of non-linearities on control surface flutter of a three-degree of freedom typical section airfoil. Non-linearities investigated include a structural non-linearity ...
Phase Transformations in Free Films
The purpose of this dissertation is to present the derivation of the governing equations for a free-film undergoing phase separation using a long-wavelength approximation to the Navier-Stokes equations coupled with the Cahn-Hilliard equation for phase transformation in a binary liquid. The equations are derived for two cases, ...
Assessment of Field Surface Treatments for Prolonging the Life of Steel Welded Joints Subjected to Fatigue Loading
In heavy truck applications welds are commonly used to join structural steel components that are subjected to cyclical loads. In cases where a weld fatigue issue is discovered in the field the customer desires to have low-cost methods to increase service life. This research was initiated to recommend a process for treating ...
Cadaveric Simulation of Flatfoot and Surgical Corrective Techniques: The Evans versus the Z-osteotomy
The main clinical purpose of this study is to compare two different surgical procedures, the Evans calcaneal osteotomy and the Z-osteotomy, both of which are used to correct Stage II (flexible) cases of flatfoot deformity. This work is a follow-up to a pilot study completed previously by the VA Center of Excellence for Limb ...