Browsing by Department "Aerospace Engineering and Engineering Mechanics"
Now showing items 1-20 of 108
-
Ablation onset in unsteady hypersonic flow about nose-tips with a forward-facing cavity
(2001-08)A forward-facing cavity is examined as a means of reducing the severe heating and delaying ablation onset at the nose-tip of a hypersonic vehicle. Whereas previous studies have concentrated on heating rates alone, the ... -
Adaptive interplanetary orbit determination
(2000-08)This work documents the development of a real-time interplanetary orbit determination monitoring algorithm for detecting and identifying changes in the spacecraft dynamic and measurement environments. The algorithm may ... -
Adaptive output feedback controllers for a class of nonlinear mechanical systems
(2002)Even from the early days of adaptive control theory, it has been a primary target for several researchers to guarantee global stability using as limited assumptions as possible. Currently, there exist applicable theories ... -
Analysis and order reduction of an autonomous lunar lander navigation system
(2009-08)A navigation system for precision lunar descent and landing is presented and analyzed. The navigation algorithm is based upon the extended Kalman Filter and employs measurements from an inertial measurement unit to propagate ... -
Automated generation and optimization of ballistic lunar capture transfer trajectories
(2009-08)The successful completion of the Hiten mission in 1991 provided real-world validation of a class of trajectories defined as ballistic lunar capture transfers. This class of transfers is often considered for missions to the ... -
The compressive response of open-cell foams
(2005)The compressive response of many cellular materials is characterized by a nearly linear elastic regime, which terminates into a limit load. This is followed by an extensive load plateau that is responsible for their ... -
A computational procedure for analysis of fractures in two-dimensional multi-field media
(2010-12)A systematic procedure is followed to develop singularity-reduced integral equations for modeling cracks in two-dimensional, linear multi-field media. The class of media treated is quite general and includes, as special ... -
Computational studies of electron transport and reaction rate models for argon plasma
(2010-08)A validation study was performed on a capacitively coupled argon discharge to determine the most suitable models for chemistry and electron transport. Chemical reaction rate and electron transport models choices ... -
Conceptual level FEM based wing weight estimation
(2010-08)Weight and its estimation have a vital impact in the aircraft design process from the very early phases. When the conceptual design configuration of an aircraft has been created, it should ensure that the estimated weight ... -
Controlling fiber/matrix adhesion with binary self-assembled monolayers
(2006-05)A mixed self-assembling monolayer was applied to a sapphire fiber using two carbon based molecules, Dodeciltrichlorosilane (DTS), and Bromoundecyltrichlorosilane, (BrUTS), in varying ratios. Fibers were cured in an epoxy ... -
Cooperative shape and orientation control of autonomous vehicle formations
(2010-12)This dissertation solves variations of three mathematical problems for autonomous vehicle formations: (1) formation shape control in the plane, (2) robust information architecture design, and (3) formation attitude ... -
Development of an analytical guidance algorithm for lunar descent
(2007-12)In recent years, NASA has indicated a desire to return humans to the moon. With NASA planning manned missions within the next couple of decades, the concept development for these lunar vehicles has begun. The guidance, ... -
Diagonal plus low rank approximation of matrices for solving modal frequency response problems
(2010-12)If a structure is composed mainly of one material but contains a small amount of a second material, and if these two materials have significantly different levels of structural damping, this can increase the cost of ...
