Browsing by Author "Hartfield, Roy"

Now showing items 41-54 of 54

Methods for Optimization of a Launch Vehicle for Pressure Fluctuation Levels and Axial Force

Thomas, Scott (2008-08-15)

A computational fluid dynamics (CFD) code has been combined with a Genetic Algorithm (GA) to perform a shape optimization study on a two dimensional axisymmetric model of a typical launch vehicle. The objective of this ...

Numerical Investigation of the Flow Topology in a Bidirectional Vortex Engine

Sharma, Gaurav (2023-03-30) ETD File Embargoed

The characterization of swirl-driven phenomena, including cyclonic flows, continues to receive attention in the propulsion community. This may be attributed to the beneficial properties of swirl when integrated into ...

On the Classification of Intermediate Range Missiles During Launch

Eckert, Jordan (2020-05-13)

This thesis explores the comparisons and contrasts of different statistical method approaches to a missile system classification which is sufficiently rapid to be suitable for use during engagement. It is meant to extend ...

Optimization of a Turboramjet Hot Section with an Interstage Turbine Burner

Thorn, Caitlin (2016-05-05)

A turbine based combined cycle engine (TBCC) is currently in development for use in the SR-72 reconnaissance aircraft, the successor to the SR-71 Blackbird. With a proposed operating range of Mach 0-6, there is a need for ...

Optimization of Fuel-Air Mixing for a Scramjet Combustor Geometry Using CFD and a Genetic Algorithm

Ahuja, Vivek (2008-12-15)

A new methodology for the optimization of fuel-air mixing in a scramjet combustor using integrated Genetic Algorithms and Computational Fluid Dynamics is presented. A typical combustor design involving Mach 2 crossflow ...

Propeller Design and Optimization Using a Robust Genetic Algorithm and a Computationally Efficient Solver

Pastor, Grady (2022-03-28)

A computationally efficient and reliable propeller design tool has been constructed using an advanced real coded Genetic Algorithm (GA) and a mid-fidelity potential flow solver. The GA constructs a population of propeller ...

Propeller Performance Analysis and Multidisciplinary Optimization Using a Genetic Algorithm

Burger, Christoph (2007-12-15)

A propeller performance analysis program has been developed and integrated into a Genetic Algorithm for design optimization. The design tool will produce optimal propeller geometries for a given goal, which includes ...

Quantifying the Fatigue Damage Accumulation in Bridges

Ramesh Babu, Anjan Mogali (2019-12-05)

Many of the existing bridges in the United States were built during the interstate era and are reaching the end of their life cycle. Traffic-induced loadings are one of the primary factors affecting the service and fatigue ...

Study of aerodynamic interactions in counter-rotating coaxial rotors

Silwal, Lokesh (2023-12-06) ETD File Embargoed

Counter-rotating coaxial rotors (CCR) are ubiquitous in emerging next-generation configurations, demonstrating enhanced performance metrics such as increased forward-flight speed, flight range, and payload capabilities ...

A Study of the Nonlinear Acoustic Response of Area-contractions and Sense-lines

Teasley, Thomas (2017-12-08)

Rocket and gas turbine engine combustion instabilities, which lead to rapid engine failure through enhanced heat transfer rates and high-cycle fatigue, continue to be a serious concern for engineers. Experimental pressure ...

Tapered Grain Geometry and Statistical Learning for Solid Rocket Motor Simulation

Sheils, Tyler (2023-04-26)

This thesis investigates applying statistical learning techniques to a tapered grain solid rocket motor simulation. Tapered grain solid rocket motors (SRMs) have application in both defense and space industries. Tapered ...

Three-Dimensional Trajectory Optimization in Constrained Airspace

Dai, Ran (2007-12-15)

This dissertation deals with the generation of three-dimensional optimized trajectory in constrained airspace. It expands the previously used two-dimensional aircraft model to a three-dimensional model and includes the ...

Triglobal Stability Analysis of the Thermoacoustic Field in Rocket Engines

Kovacic, Paul (2020-08-14) ETD File Embargoed

One of the most daunting problems in the development of a rocket engine is the appearance of coherent oscillatory structures in the flow. Characterized primarily by fluctuations in pressure, these oscillations can sync ...

WIM-Based Live Load Model for Bridges

Iatsko, Olga (2018-04-24)

The knowledge of the actual live load is essential for a rational management of highway structures. Overloaded vehicles can cause damage including concrete cracking, potholes, excessive vibration and deflection, and even ...