Browsing PhD Dissertations - DO NOT EDIT by Issue Date
Now showing items 41-60 of 239
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Preliminary Design Of A Pressurization System For Small Bipropellant Rocket Engines
(Aerospace Engineering, 2012-04-11)A study was conducted on the feasibility of developing a device or system that would improve the performance of small, bipropellant rockets through pressurization of the propellants. Due to the limitations in the space ... -
Graph Theoretic Framework Based Cooperative Control And Estimation Of Multiple UAVS For Target Tracking
(Mechanical Engineering, 2012-07-25)Designing the control technique for nonlinear dynamic systems is a significant challenge. Approaches to designing a nonlinear controller are studied and an extensive study on backstepping based technique is performed in ... -
Investigation Of Instabilities Affecting Detonations: Improving The Resolution Using Block-structured Adaptive Mesh Refinement
(Aerospace Engineering, 2012-07-25)The unstable nature of detonation waves is a result of the critical relationship between the hydrodynamic shock and the chemical reactions sustaining the shock. A perturbative analysis of the critical point is quite ... -
Experimental And Numerical Investigation Of Mass Transfer In Microreactors
(Mechanical Engineering, 2012-07-25)In this work, two types of microreactors for reactions have been studied, which were involving multiple fluid phases: liquid-liquid (immiscible liquids) phase and gas-liquid phase. Investigation of mass transfer within ... -
Estimation Of Aircraft States And Wind Exposure In Aerial Refueling
(Aerospace Engineering, 2012-07-25)When a tanker and receiver aircraft fly in tight formation in an aerial refueling operation, they are exposed to various sources of wind with varying magnitude and direction. The tanker and the receiver aircraft experience ... -
New Detonation Concepts For Propulsion And Power Generation
(Aerospace Engineering, 2012-07-25)A series of related analytical and experimental studies are focused on utilizing detonations for emerging propulsion and power generation devices. An understanding of the physical and thermodynamic processes for this ... -
Passive Wireless Antenna Sensors For Crack Detection And Shear/compression Sensing
(Mechanical Engineering, 2013-03-20)Despite the fact that engineering components and structures are carefully designed against fatigue failures, 50 to 90% of mechanical failures are due to fatigue crack formation. The severity of the failure depends on both ... -
Lumped Parameter Modeling Of Fluid Line Dynamics With Turbulent Flow Conditions
(Mechanical Engineering, 2013-03-20)A procedure for obtaining rational polynomial transfer functions representing ordinary differential equations for time domain transient response simulations of systems with fluid transmission lines with incompressible ... -
Integrated Modeling Approach For Solid Oxide Fuel Cell-based Power Generating System
(Mechanical Engineering, 2013-07-22)Solid oxide fuel cell (SOFC) systems have been recognized as the most advanced power generation system with the highest thermal efficiency with a compatibility with a wide variety of hydrocarbon fuels, synthetic gas from ... -
A Semi-analytical Approach To Obtain Physical Fields In Heterogeneous Materials
(Mechanical Engineering, 2013-07-22)Predicting the macroscopic response of heterogeneous materials has been the subject of extensive research in the engineering community, even more so, in the composites guild. With analytical solutions being almost impossible ... -
Advanced Materials Characterization Based On Full Field Deformation Measurements
(Aerospace Engineering, 2013-10-22)Accurate stress-strain constitutive properties are essential for understanding the complex deformation and failure mechanisms for materials with highly anisotropic mechanical properties. Among such materials, glass-fiber- ... -
Investigation Of Side Wall Effects On An Inward Scramjet Inlet At Mach Number 8.6
(Aerospace Engineering, 2013-10-22)Experimental and computational studies were conducted to evaluate the performance of a scramjet inlet as the side cowl length is changed. A slender inward turning inlet with a total length of 304.8 mm, a span of 50.8 mm ... -
Study Of The Capabilities Of Electrowetting On Dielectric Digital Microfluidics (EWOD DMF) Towards The High Efficient Thin-film Evaporative Cooling Platform
(Mechanical Engineering, 2013-10-23)With the current technological advancement, the size of the electronic components is being reduced to smaller and compact sizes. In the meantime, the packaging density and power consumption is ever increasing. To tackle ... -
Design, Fabrication And Test Of Surface Tension-driven Microboats And Thermally Oscillatory Bubble-propelled Microsubmarines
(Mechanical Engineering, 2013-10-23)In this work, we develop microboats and microsubmarines, which are capable of moving on and under water, respectively. The microboat is propelled due to the difference between surface tensions around stern and bow. This ... -
A One Dimensional Dry Friction Microconveyor Platform: Modelling And Analysis Of Micropart Motion Due To Surface Excitation
(Mechanical Engineering, 2014-03-10)Many approaches are used for micropart manipulation ranging from individual pick and place to manipulation through a workcell comprising of arrays of actuators. Existing approaches provide discrete actuation and have ... -
A New Multiscale Approach For Dynamic Modeling And Simulation Of Micro-nano Biomolecular Systems Characterized By A Low Reynolds Number
(Mechanical Engineering, 2014-07-14)In this dissertation, a new multiscale computational framework was developed in order to model and simulate motility of micro-nano-sized objects in fluid environments, characterized with a low Reynolds number. Especially, ... -
Experimental Investigation Of Nucleate Boiling And Thin-film Evaporation On Enhanced Silicon Surfaces
(Mechanical Engineering, 2014-07-14)The present work consists of two major studies. The first study investigates the effects of surface energy or wettability on nucleate pool boiling and the second study investigates the thin-film evaporative cooling for ... -
Unsteady Thrust Measurement Techniques For Pulse Detonation Engines
(Aerospace Engineering, 2014-07-14)Thrust is a critical performance parameter and its correct determination is necessary to characterize an engine. Many conventional thrust measurement techniques prevail. However, further developments are required for correct ... -
Dynamic Simulation Of Multibody Systems In Simultaneous, Indeterminate Contact And Impact With Friction
(Mechanical Engineering, 2014-07-14)This research is focused on improving the solutions obtained using theory in contact and impact modeling. A theoretical framework is developed which can simulate the performance of dynamic systems within a real world ... -
Finite Element Based Methodology For Prediction Of Matrix-dominated Failure In Composites
(Aerospace Engineering, 2014-07-14)The objective of this work is to develop a computational failure prognosis methodology applicable to virtual testing of composites. The major motivation for the establishment of virtual testing is the ability to reduce ...