Browsing by Department "Aerospace Engineering"
Now showing items 1-20 of 501
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3D Maneuvers For Asymmetric Under-Actuated Rigid Body
(2013-08-01)Most spacecraft are designed to be maneuvered to achieve pointing goals. This is generally accomplished by designing a three-axis control system. This work explores new maneuver strategies when only two control inputs are ... -
3D Multi-Field Multi-Scale Features From Range Data In Spacecraft Proximity Operations
(2012-07-16)A fundamental problem in spacecraft proximity operations is the determination of the 6 degree of freedom relative navigation solution between the observer reference frame and a reference frame tied to a proximal body. For ... -
A Novel Uncoupled Method for Static Aeroelastic Analysis Towards Morphing Structures Design
(2020-04-16)Fluid-structure interaction (FSI) analysis is a common tool used to analyze aeroelastic problems. The traditional FSI scheme couples independent structure and fluid solvers in space and time. For many aerospace applications ... -
Absolute and Relative Motion Satellite Theories for Zonal and Tesseral Gravitational Harmonics
(2018-05-08)In 1959, Dirk Brouwer pioneered the use of the Hamiltonian perturbation methods for constructing artificial satellite theories with effects due to nonspherical gravitational perturbations included. His solution specifically ... -
Accounting for Parameter Uncertainty in Reduced-Order Static and Dynamic Systems
(2012-02-14)Parametric uncertainty is one of many possible causes of divergence for the Kalman filter. Frequently, state estimation errors caused by imperfect model parameters are reduced by including the uncertain parameters as states ... -
Acoustics in the Klebanoff-Saric Wind Tunnel: Background Identification, Forcing, and Active Control
(2012-07-16)Low disturbance wind tunnels, such as the Klebanoff–Saric Wind Tunnel (KSWT), offer an ideal environment to study boundary layer transition. In particular, the leading-edge receptivity of sound can be measured by creating ... -
Active control of underwater propulsor using shape memory alloys
(Texas A&M University, 2007-04-25)The development of a leading edge propeller blade reconfiguration system using Shape Memory Allow (SMA) muscles is presented. This work describes the design and testing of a leading edge flap, which is used to alter the ... -
Active flow control in an advanced serpentine jet engine inlet duct
(2009-05-15)An experimental investigation was performed to understand the development and suppression of the secondary flow structures within a compact, serpentine jet engine inlet duct. By employing a variety of flow diagnostic ... -
Active Space Debris Removal using Capture and Ejection
(2013-04-25)Low Earth Orbit is over-cluttered with rogue objects that threaten existing technological assets and interfere with allocating new ones. Traditional satellite missions are not efficient enough to collect an appreciable ... -
Actuation Fatigue Characterization Methods and Lifetime Predictions of Shape Memory Alloy Actuators
(2017-05-05)Shape Memory Alloys (SMAs) are a class of intermetallic alloys that possess the ability to repeatedly sustain large amounts of deformation and recover a designed geometry through a thermal-induced, diffusionless, solid-to-solid ... -
Actuation Fatigue of Shape Memory Alloys
(2012-07-16)A testing method was developed to cycle quickly and repeatably Ni60Ti40 (wt. %) SMA specimens through temperature-induced transformation while under constant stress until failure. Previous works have shown fatigue cracks ... -
Adaptive and Orbital Element Methods for Conjunction Analysis
(2020-01-25)Collisions between Earth orbiting satellites and debris have been a topic of growing concern among satellite operators and governments for many years. At the heart of preventing collisions, which have been observed to have ... -
Adaptive control for Mars atmospheric flight
(2009-05-15)The new vision for space exploration will focus on sending humans to the moon and eventually to Mars. This endeavor presents new challenges that are critically different from the past experience with robotic missions to ... -
Adaptive dynamic inversion of nonlinear systems subjected to control saturation constraints
(Texas A&M University, 2007-09-17)The adaptive dynamic inversion control methodology uses dynamic inversion to calculate the control, and adaptation to compensate for the errors in the inversion due to model uncertainties. Traditionally, adaptive control ... -
Adaptive inverse modeling of a shape memory alloy wire actuator and tracking control with the model
(2009-06-02)It is well known that the Preisach model is useful to approximate the effect of hysteresis behavior in smart materials, such as piezoactuators and Shape Memory Alloy(SMA) wire actuators. For tracking control, many researchers ... -
Advanced Mission Design: Interplanetary Super Highway Trajectory Method
(2015-06-04)Near-future space missions demand the delivery of massive payloads to deep space destinations. Given foreseeable propulsion technology, this is feasible only if we can design trajectories that require the smallest possible ... -
Advances in Reduced-Order Modeling Based on Proper Orthogonal Decomposition for Single and Two-Phase Flows
(2012-02-14)This thesis presents advances in reduced-order modeling based on proper orthogonal decomposition (POD) for single and two-phase flows. Reduced-order models (ROMs) are generated for two-phase gas-solid flows. A multiphase ... -
Advancing the Theoretical Foundation of the Partially-averaged Navier-Stokes Approach
(2013-05-06)The goal of this dissertation is to consolidate the theoretical foundation of variable-resolution (VR) methods in general and the partially-averaged Navier-Stokes (PANS) approach in particular. The accurate simulation of ... -
Aerodynamic Design for Swept-wing Laminar Flow
(2013-11-08)This work describes and compares processes for swept-wing laminar flow control (SWLFC) aerody-namic design. It focuses on results obtained during the preliminary outer-mold-line (OML) design of the Subsonic Aircraft ... -
Aeroelastic Response of a Typical Wing Section under Nonlinearities and Gust Loads
(2015-05-12)Aeroservoelasticity (ASE) is the interdisciplinary study of the interaction of structural, inertial, aerodynamic, and control loads for aircraft systems, and is inherently a nonlinear phenomenon. One of the goals of ASE ...