Browsing by Author "Beale, David"

Now showing items 1-20 of 32

Adaptive Disturbance Rejection and Stabilization for Rotor Systems with Internal Damping

Simon, Andras (2009-05-15)

Advanced rotor systems today consist of a lightweight rotor supported by radial active magnetic bearings (AMB). These systems are widely used in flywheel applications and in other fields where high rotational speeds are ...

Analysis of Braided Composites Structures and Yarns for Compression Loading and Design for First Bending Mode

Mysore, Shivacharan (2017-08-17)

The open architecture composite structures team at Auburn University has developed prototypes of strong, ultra-lightweight braided lattice structures for primary application in the aerospace sector. This research focuses ...

Ballistic Limit Velocity For Continuous Fiber Polymeric Composite Materials and Polymers Through Experimental and Numerical Methods

Grupp, Jonathan (2015-05-06)

Composite materials are often subject to harsh operating environments which may include impact from errant projectiles of various geometries traveling at specific velocities and trajectories. Experimentalists seek to ...

Construction of a Diesel Engine Test Stand and a Crank Angle Based Heat Release Model

Wingo, Taylor (2011-11-15)

A test stand for a light duty diesel engine was constructed and used to measure both mean and crank angle based engine operating parameters. The test stand features a 1.1L Hyundai CRDi turbo-diesel engine, a Land and Sea ...

Construction Technique and Strength of Connected Regolith Bag Structures

Singh, Mandeep (2007-05-15)

Masonry Arches have been used from a long time in construction of bridges, domes and other structures. They are constructed out of voussoirs and their stability is determined by drawing a funicular polygon representing ...

Design and Analysis of Air and Coolant Control for a Polymer Electrolyte Membrane Fuel Cell

Ahn, Jongwoo (2007-08-15)

The polymer electrolyte membrane (PEM) fuel cell is an alternative engine that can potentially replace the internal combustion engine in the vehicles of the future. When hydrogen, stored in a tank, and oxygen, from the ...

Design and Analysis of Woven Shape Memory Alloy Fabric

Skalitzky, Amanda (2018-11-27)

Shape Memory Alloys (SMA) are smart materials that can memorize a shape and return to that shape after deformation upon the application of stress or heat. The most commonly used SMA is Nitinol (NiTi) which consists of ...

Design and Evaluation of a 3D Road Geometry Based Heavy Truck Fuel Optimization System

Huang, Wei (2010-07-28)

This dissertation develops a 3D road geometry based optimal powertrain control system in reducing the fuel consumption of heavy trucks. The real-time optimal control (OC) system, solving a constrained nonlinear programming ...

Design, Simulation, and Precision Manufacturing of Flexible-Backing, Morphing Composite Metamaterials that Lock Suddenly in Global Bending

Petersen, Caleb (2021-04-30) ETD File Embargoed

Few composite structures, let alone single materials, are known that undergo sudden but reversible stiffening at a pre-engineered strain profile, especially in global bending. This research builds upon this author’s previous ...

Developing a Magnetically Suspended Disc System for Industrial Applications, with Application on Ring Spinning

Abuelenin, Sherif (2005-08-15)

A Magnetically suspended and lightweight disc (rotor) system is designed; the rotor can spin freely inside the stator. The stator is equipped with four magnetic actuators that always keep the rotor in its central position. ...

Development and Testing of Open Architecture Composite Structures and Composite Yarns for Compressive Strength

Sangars, Uday Bhaskar (2015-12-16)

Open Architecture Composite Structures (O-ACS) are truss structures formed by braid- ing specially designed hybrid yarns, made of high strength bers, on convex shaped mandrels. Previous studies on them have shown that ...

Development of Test Methods for Evaluation of Bending Stiffness and Compressive Modulus of Braided Composite Lattice Structures

Shirgaonkar, Sanyam (2015-01-14)

Open Architecture Composite Structures (O-ACS) have been recently developed and are known for their high modulus per unit weight. They are truss structures preformed on a mandrel shaped as a cylindrical, elliptical or ...

Dynamics and Synthesis of Kinematic Chains with Impact and Clearance

Stoenescu, Eleonor (2005-05-15)

The dynamics and synthesis of open and closed kinematic chains with frictional impact and joint clearance is studied. The impact between rigid bodies with friction is investigated. A new model of impact with friction ...

Enabling Shape Memory Alloys as Actuators for Robotics

Gurley, Austin (2017-11-27)

Does any existing technology provide a viable actuator for the high degree-of-freedom robots that will soon be ubiquitous in society? If a technology exists that is in any way superior to the electric motor for robotics – ...

Experimental analysis of the wear of rubber against harder materials in reciprocating motion

Zhao, Yang (2015-07-21)

This work investigated the wear performance of rubber when contacted against harder composite materials through experimental analysis. The focus of this thesis was to find the optimal type of rubber and the composite ...

Experimentation and Modeling of NOx Formation in a Small Turbo-Charged Diesel Engine

Thames, Matthew (2012-12-05)

In this thesis a detailed investigation into the primary formation characteristics and modeling approaches for the formation of NOx in turbo-charged diesel engines is presented. Through this investigation a multi-layered ...

How Tibiofemoral Alignment Effects the Medial-Lateral Compartment Loading in the Knee Joint During Tai Chi Gait, a Musculoskeletal Modeling Approach

Holtkamp, Colin (2020-07-13)

Osteoarthritis of the knee joint is one of the most common disabling diseases in the United States particularly among elderly people. Even though no disease altering cure currently exists that rectifies the degenerative ...

In-situ Electronics Measurement Using X-ray Micro-Computed Tomography System and Data Driven Prognostic Health Management

Wei, Junchao (2017-05-02)

In the 21st century, the electronics is everywhere and covers every aspect of human life. You can find it when watching TV, opening a laptop, or checking emails on a cell phone. Since 2015, 268 million PCs, 455 million ...

A Machine Vision and Sensing System for Braid Defect Detection, Diagnosis and Prevention During Manufacture

Branscomb, David (2007-12-15)

The mechanical properties of braids are often quite convenient for achieving the high performance levels expected of composite materials. A favorable attribute of a braided structure is the ability for the design engineer ...

Modeling and Numerical Simulation of Shape Memory Alloys in Robotics Applications

Lambert, Tyler Ross (2017-07-27)

Shape memory alloys (SMA) are uniquely alloyed metals that have the ability to change crystalline structure upon the application or removal of stress or upon heating or cooling. This change in crystalline structure gives ...