Browsing by Department "Aerospace Engineering"
Now showing items 1-20 of 538
-
(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 ...
-
(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 ...
-
(1979)This paper describes the results of the initial phase of a program being conducted to develop systems and procedures to maximize ballast and lifting gas usage on board an atmospheric research balloon. Computer programs, ...
-
(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 ...
-
(1993)A 4.05% model of the NASA Space Shuttle Orbiter was tested (Test 9238) at the Texas A&M University Low Speed Wind Tunnel (TAMU-LSWT) at various heights above the wind tunnel floor, in order to simulate the ground effect ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(2021-12-10)As the design of aerospace vehicles continues to evolve and become more complex, an accurate understanding of the physics at work in the flowfields around these vehicles is required. Alongside flight tests and wind tunnel ...
-
(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 ...
-
(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 ...