Now showing items 1941-1950 of 1985
Shape Memory Alloy Cellular Solids.
(2009)
Nitinol (NiTi) shape memory alloy honeycombs, fabricated in low densities using a new
brazing method, recently demonstrated enhanced shape memory and superelastic properties
by exploiting kinematic amplification of thin-walled ...
Stochastic Optimal Control of Spacecraft.
(2010)
This dissertation studies the influence of uncertainty on spacecraft control. The sources of the uncertainty are either imperfect state measurements or stochastic acceleration due to thruster noise. First, we analyze the ...
The Full Two-Body-Problem: Simulation, Analysis, And Application To The Dynamics, Characteristics, And Evolution Of Binary Asteroid Systems.
(2009)
The Full Two-Body-Problem (F2BP) describes the dynamics of two unconstrained rigid bodies in close proximity, having arbitrary spatial distribution of mass, charge, or similar field quantity, and interacting through a ...
Directional Transduction for Guided Wave Structural Health Monitoring.
(2009)
The principal objectives of structural health monitoring (SHM) are the detection, location, and classification of structural defects that may adversely affect the performance of engineering systems. Ultrasonic testing based ...
Nonlinear Vibration Analysis of Cracked Structures - Application to Turbomachinery Rotors with Cracked Blades. Turbomachinery Rotors with Cracked Blades.
(2009)
Novel vibration analysis frameworks for elastic structures with a crack are presented. The vibration analysis of a cracked structure has important applications for vibration-based structural health monitoring and damage ...
Reduced-Complexity Algorithms for Data Assimilation of Large-Scale Systems.
(2008)
Data assimilation is the use of measurement data to improve estimates of the state of dynamical systems using mathematical models. Estimates from models alone are
inherently imperfect due to the presence of unknown inputs ...
Compressible Flows for Fluidic Control in Microdevices.
(2010)
Although studies of microscale flow have covered an extensive range of flow phenomena and flow conditions, one area that has received limited attention is bounded gas flows. This dissertation describes the applicability ...
Study of the Synchronous Operation of an Annular Field Reversed Configuration Plasma Device.
(2008)
Field Reversed Configuration (FRC) plasmas are high-density, magnetized, pulsed plasmas with unique translational and effcient formation properties that lend themselves to many uses. This dissertation furthers the understanding ...
A Time-resolved Investigation of the Hall Thruster Breathing Mode.
(2010)
The existence of plasma oscillations in the near and far field discharge of a Hall effect thruster alters the conventionally held view of their operation as steady electrostatic propulsion devices. Indeed, the consequences ...
Design Optimization for Active Twist Rotor Blades.
(2010)
This dissertation introduces the process of optimizing active twist rotor blades in the presence of embedded anisotropic piezo-composite actuators. Optimum design of active twist blades is a complex task, since it involves ...