This Is AuburnElectronic Theses and Dissertations

Browsing Auburn Theses and Dissertations by Department "Mechanical Engineering"

Now showing items 1-20 of 376

Accelerated Lifetime Characterization and Development of Test Protocols for Class I/Class II Micro-Machined Sensors and Flexible Li-ion Power Sources 

Abrol, Amrit (2019-04-03)  ETD File Embargoed
Modern day applications have led to extensive miniaturization of consumer electronics along with incorporation of state-of-the-art sensor devices and acceptance of flexible materials within an electronic assembly. With the ...

Acoustic Metamaterials: Air Permeable Super Sound Attenuators and Acoustic Metalenses 

Zhang, Fuxi (2019-07-23)
In recent decades, acoustic metamaterials have become more practical for diverse applications of sound manipulation, rather than academic curiosities and theoretical derivations. This kind of artificial material demonstrates ...

Adaptive Control of a Farm Tractor with Varying Yaw Properties Accounting for Actuator Dynamics and Nonlinearities 

Derrick, John (2008-05-15)
Two adaptive control algorithms for the automatic steering control of a farm tractor with varying hitch forces are developed. Tractors can be configured many different implements, and implements interact with the soil in ...

An Adaptive Control System for an Accelerating Rotor Supported by Active Magnetic Bearings under Unbalance Disturbances 

Wang, Xianglin (2017-10-12)
This thesis describes an adaptive control system capable of rejecting unbalance disturbances for an accelerating rotor supported by active magnetic bearings (AMBs). The control of accelerating rotor during start-up and ...

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 ...

Additive Manufacturing of Fatigue Resistant Austenitic Stainless Steels by Establishing the Process-Structure-Property Relationships 

Pegues, Jonathan (2019-12-10)
This work presents a multidisciplinary approach (relating microstructure features to mechanical properties) to utilize additive manufacturing as a tool to fabricate superior, fatigue resistant materials. The ultimate goal ...

Advancements in Vacuum Process Molding and Casting 

Capps, Johnathon (2005-08-15)
Vacuum assisted molding, or ‘V’ Process molding, possesses many benefits over other sand casting processes. However, the process lacks the high cooling rates and speed of solidification that other sand casting processes ...

Advances in Digital Gradient Sensing (DGS) Method for Experimental Mechanics 

Miao, Chengyun (2019-09-19)
Shape and surface topography evaluation from measured slopes is of considerable engineering significance in optical metrology and experimental mechanics. These kinematic quantities are often used for metrology of optical ...

Aging Induced Evolution of the Fatigue Behavior and Microstructure of Sn-Ag-Cu Lead Free Solders 

Fu, Nianjun (2017-07-31)
Solder joints in electronic assemblies are often subjected to cyclic (positive/negative) mechanical strains and stresses. Such exposures can occur in variable temperature application environments or during accelerated ...

Alternate In-Situ Environmental Testing System by Matrix Design 

Li, Jingyun (2009-03-30)
Compared with the existing in-situ environmental testing system, this alternative one got significant improvement on measuring capacity, total cost, as well as number of connections that must be made between the hardware ...

Analysis and Control of Dynamical Systems with Quasi-Periodic Coefficients 

Sharma, Ashu (2019-05-08)  ETD File Embargoed
Parametrically excited linear systems with oscillatory coefficients have been generally modeled by Mathieu or Hill equations (periodic coefficients) because their stability and response can be determined by Floquét theory. ...

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

Mysore, Shivacharan (2017-08-17)  ETD File Embargoed
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 ...

An Analysis of Elastic Rough Contact Models 

Xu, Yang (2012-07-27)
The problem of elastic contact between one nominally flat rough surface and one rigid flat is studied. A variety of contact models have been applied to this problem since the pioneering work of Archard in 1956. Those contact ...

Analysis of Record and Playback Errors of GPS Signals Caused by the USRP 

Hennigar, Andrew (2014-12-10)
In this thesis, the errors created by the USRP (Universal Software Receiver Platform) during record and playback are analyzed. The USRP is used for jamming, spoo fing, and GPS processing, and has recently become widely ...

An Analysis of Surface Roughness and its Influence on a Thrust Bearing 

Zhang, Xiaohan (2018-07-24)
Thrust bearings are a widely used type of bearing in many rotary industrial applications. In this work, a thrust bearing surface under the mixed lubrication regime is analyzed. A new model which coupled the mechanical ...

An Analysis of the Multi-scale Structure of Rough Surfaces 

Zhang, Xiaohan, Jr. (2014-12-04)
Even with the various surface finishing techniques, all surfaces are rough with different structures and geometric characteristics over multiple scales. The roughness impacts significantly the friction, wear, and surface ...

Analytical and experimental analysis of the permanent deformation after collisions 

Ghaednia, Hamid (2017-08-03)
This work studied the normal and oblique impact of elastic-plastic metals. The focus of this work was to investigate the relations between the permanent deformations after the collisions and the motion of the impacting ...

An Analytical and Experimental Investigation of Nanoparticle Lubricants 

Ghaednia, Hamed (2014-07-29)
This work investigated the tribological effects of nanoparticle additives on lubrication through experimental and analytical investigations on colloidal lubricants. The focus of this dissertation was to investigate and ...

Application of Low Melt Alloys as Compliant Thermal Interface Materials: A Study of Performance and Degradation under Thermal Duress 

Roy, Chandan (2016-07-08)
Thermal interface materials (TIMs) are a crucial part of thermal management in micro-electronics and often can account for a significant portion of the overall thermal budget. Generally, materials with high thermal ...

Area-Array Package Reliability Models for No-Core PCB Assemblies in Extreme Thermo-Mechanical Environments 

Moore, Timothy (2007-08-15)
The trends in the electronic packaging industry are to design smaller packages that have higher complexity, and to improve package reliability while reducing costs. These needs in the packaging industry have lead to a ...