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Articles 6961 - 6990 of 11196

Full-Text Articles in Aerospace Engineering

Finite Element Based Methodology For Prediction Of Matrix-Dominated Failure In Composites, Guillaume Seon Jan 2014

Finite Element Based Methodology For Prediction Of Matrix-Dominated Failure In Composites, Guillaume Seon

Mechanical and Aerospace Engineering Dissertations - Archive

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 actual testing of composite structures, which is oftentimes expensive and time consuming, by numerical simulations. A successful virtual test methodology should be applicable to monotonic and fatigue loading, account for strong anisotropy of composite materials and capture the effects of manufacturing irregularities. This work proposes to use three-dimensional finite element modelling for predicting the onset and progression of matrix-dominated failures modes, such as matrix cracks and delaminations, …

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Improving Ducting To Increase Cooling Performance Of High-End Web Servers Subjected To Signicant Thermal Shadowing -An Experimental And Computational Study, Divya Mani Jan 2014

Improving Ducting To Increase Cooling Performance Of High-End Web Servers Subjected To Signicant Thermal Shadowing -An Experimental And Computational Study, Divya Mani

Mechanical and Aerospace Engineering Theses - Archive

Ensuring that all the critical components like CPU's receive sufficient amount of flow as per their requirement is an vital importance in implementing air cooling for IT equipments. In addition to that the overall system resistance varies with the component location with in the chassis. In this study, parametric improvement in chassis ducting system is made to counteract the effects of thermal shadowing in a open compute air cooled server in which a CPU thermally shadows the other. Commercially available computational fluid dynamics codes have permitted simulation of server models to predict efficiency of the servers with every changes made …

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Analytical And Experimental Investigation Of Thermal Transport In Three-Dimensional Integrated Circuits (3d Ics), Leila Choobineh Jan 2014

Analytical And Experimental Investigation Of Thermal Transport In Three-Dimensional Integrated Circuits (3d Ics), Leila Choobineh

Mechanical and Aerospace Engineering Dissertations - Archive

Thermal management of three-dimensional integrated circuits (3D ICs) is recognized to be one of the foremost technological and research challenges currently blocking the widespread adoption of this promising technology. The computation of steady-state temperature fields in a 3D IC is critical for determining the thermal characteristics of a 3D IC and for evaluating any candidate thermal management technology. An analytical solution for the three-dimensional temperature field in a 3D IC based on solution of the governing energy equations using Fourier series expansion for steady-state temperature fields is studied. Comparison of the predicted temperature fields with finite-element simulation shows excellent agreement. …

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Effect Of Warm Water Cooling For An Isolated Hybrid Liquid Cooled Server, Alekhya Addagatla Jan 2014

Effect Of Warm Water Cooling For An Isolated Hybrid Liquid Cooled Server, Alekhya Addagatla

Mechanical and Aerospace Engineering Theses - Archive

Data center cooling strategies have changed overtime due to increases in power densities and ever increasing server cooling power requirement. Traditionally, most data centers adopt air cooling where the Computer Room Air Conditioning (CRAC) units pump volumes of chilled air to cool information technology (IT) equipment and dispose the heat from the servers to the ambient. With demand for energy-efficient and cost-effective data centers growing, alternative methods to both provide electrical power and cooling systems are the subject of active investigation. As data centers increase in size and current air-cooling systems reach their limitations, cooling technology will inevitably evolve towards …

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A New Multiscale Approach For Dynamic Modeling And Simulation Of Micro-Nano Biomolecular Systems Characterized By A Low Reynolds Number, Mahdi Haghshenas-Jaryani Jan 2014

A New Multiscale Approach For Dynamic Modeling And Simulation Of Micro-Nano Biomolecular Systems Characterized By A Low Reynolds Number, Mahdi Haghshenas-Jaryani

Mechanical and Aerospace Engineering Dissertations - Archive

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, it has been used for studying the dynamic behavior of biomolecular systems such as motor proteins inside cells.Long simulation run time is one of the most important issues in modeling of cellular and biomolecular systems at the nanoscale due to the multiple time and length scales involved in the dynamics of these systems. These multiscale features are caused by either structure-structure (e.g. flexibility in biological structure or contact) or structure-fluid …

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Factors Affecting The Performance Characteristics Of Wet Cooling Pads For Data Center Applications, Vishnu Sreeram Jan 2014

Factors Affecting The Performance Characteristics Of Wet Cooling Pads For Data Center Applications, Vishnu Sreeram

Mechanical and Aerospace Engineering Theses - Archive

The energy consumption of data centers in the current US market is fast growing in large numbers by every day. It was reported that in 2013, US data centers almost consumed 91 billion kilowatt-hours of electricity significant enough to power the whole of New York city twice a year [1]. Ever since the explosion of cloud computing, digital content and others the energy consumed by data centers has taken a steep increase and will continue in the coming years.As a result, there is a growing need to reduce the energy consumption of data centers by employing different cooling techniques which …

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Experimental And Computational Study Of An It Pod And Its Cooling System, Suhas Sathyanarayan Jan 2014

Experimental And Computational Study Of An It Pod And Its Cooling System, Suhas Sathyanarayan

Mechanical and Aerospace Engineering Theses - Archive

Conventional data centers are extremely large buildings that have complex power distribution and cooling systems. These data centers employ relatively expensive cooling systems which are inefficient. These inefficiencies of traditional data centers can be overcome by partitioning the server load into modular sections which can be deployed, powered and cooled depending on availability and requirement. Modular data centers are increasingly being developed instead of using large data centers to save huge amount of capital investment. High energy efficiency is a priority and measures have been taken to increase it. Cooling techniques such as air-side economization and evaporative cooling are proving …

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Elimination Of Surface Tension Effect On A Small Plate By Developing Superwetting Surfaces, Varun Garg Jan 2014

Elimination Of Surface Tension Effect On A Small Plate By Developing Superwetting Surfaces, Varun Garg

Mechanical and Aerospace Engineering Theses - Archive

In this work, we explored the possibility of creating superwetting surfaces, which are defined here as the ones with apparent contact angles less than 5°, using roughness structures for the purpose of eliminating surface tension effect on a floating small plate. It is often considered that the ratio of the actual roughness surface over the projected one plays a critical role in generating superwetting surfaces. However, we found that the ratio of the top surfaces of roughness structures over the projected one had more influence on apparent contact angles. As this ratio was less than 0.013, the resulting apparent contact …

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Design And Multifidelity Analysis Of Dual Mode Scramjet Compression System Using Coupled Npss And Fluent Simulation, Nandakumar Vijayakumar Jan 2014

Design And Multifidelity Analysis Of Dual Mode Scramjet Compression System Using Coupled Npss And Fluent Simulation, Nandakumar Vijayakumar

Mechanical and Aerospace Engineering Theses - Archive

Hypersonic airbreathing engines provide many potential opportunities for future aerospace applications and immense efforts have been taken in gaining knowledge in them for the past decades .The physical phenomenon occurring in the hypersonic flow regime makes the design and performance prediction of a scramjet engine difficult. Though the cutting edge simulation tool development fights its way towards accurate prediction of the environment, the time consumed by the entire process in designing and analyzing a scramjet engine and its component, can be excessive. A multi-fidelity approach for designing a scramjet with a cruising Mach number of 6 is detailed in this …

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Computational Study Of Behavior Of Gas Absorption In Data Center Equipment And Its Effects On The Rate Of Corrosion/Contamination, Tejeshkumar Vasantrao Bagul Jan 2014

Computational Study Of Behavior Of Gas Absorption In Data Center Equipment And Its Effects On The Rate Of Corrosion/Contamination, Tejeshkumar Vasantrao Bagul

Mechanical and Aerospace Engineering Theses - Archive

The reliability of the data center equipment is being compromised as the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) recommendable psychrometric limits are stretched outside the recommendable zones. When the ambient conditions are conducive enough the humidity and the gaseous contaminants present in the data centers react with the elements of Printed Circuit Boards (PCB) at various temperatures. The products of the reaction may lead to short circuit or extra resistance to the passage of current. This poses an increased threat to the reliability of the PCB.Contamination has become a serious problem in the developing nations like …

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Interaction Of Growing Cracks In Hydraulic Fracturing, Li Wei Lo Jan 2014

Interaction Of Growing Cracks In Hydraulic Fracturing, Li Wei Lo

Mechanical and Aerospace Engineering Theses - Archive

Recently, hydraulic fracturing has been utilized to extract natural gas and oil from low-permeability shale rocks. This technique has been studied in hundreds of papers. A deep understanding of the fracture network formation in hydraulic fracturing is essential to advancing the technology, e.g., to enhance the quality of fracking, and to keep aquifers from being contaminated. In the present study, the Linear Elastic Fracture Mechanics (LEFM) is applied to approach the crack extension behaviors in brittle rocks under hydraulic loading. The boundary element method is used to carry out the simulation where numerical treatment is only needed upon the cracks …

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Influence Of Variation In Cpu Utilization On The Rack Level Fan Configuration As A Cooling Technique For High End Servers, Shreyas Nagaraj Jan 2014

Influence Of Variation In Cpu Utilization On The Rack Level Fan Configuration As A Cooling Technique For High End Servers, Shreyas Nagaraj

Mechanical and Aerospace Engineering Theses - Archive

The data center industry has experienced significant growth over the past decade with the introduction and explosion of online banking, social networking and entertainment services. As a result, power consumption of such facilities continues to grow at a rapid pace. It has become imperative that energy savings and efficiencies be pursued in these components at various levels within the data center facility. This project aims to achieve the same by replacing internal server fans with larger, more-efficient fan units at the rear face of the rack. This study will be conducted by using a cluster of 1.5U Intel based Open …

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Microwave-Based Navigation Of Femtosatellites Using On-Off Keying, Namrata J. Kamte Jan 2014

Microwave-Based Navigation Of Femtosatellites Using On-Off Keying, Namrata J. Kamte

Mechanical and Aerospace Engineering Theses - Archive

The objective of this research is to validate that a custom-built microchip-scale satellite transmitting a signal modulated with a Pseudo Random Noise code using On-Off Keying, can be tracked. The weak GPS satellite signal is modulated with a Pseudo Random Noise (PRN) code that provides a mathematical gain. Our signal is modulated with the same PRN code using On-Off Keying (OOK) unlike Phase Shift Keying used in GPS satellites. Our goal is to obtain timing and positioning information from the microchip-scale satellite via a ground station using the concepts of PRN encoding and the OOK modulation technique.Decimeter scale satellites, with …

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Use Of Nanoparticle Enhanced Phase Change Material (Nepcm) For Data Center Cooling Application, Harshal Gujarathi Jan 2014

Use Of Nanoparticle Enhanced Phase Change Material (Nepcm) For Data Center Cooling Application, Harshal Gujarathi

Mechanical and Aerospace Engineering Theses - Archive

This study attempts to take advantage of nanoparticles with high thermal conductivity and the latent heat capacity of phase change materials together to enhance heat transfer rate. The main difficulty in using PCM for energy application is its low thermal conductivity in solid state. So, when solidification starts it makes it hard for evacuation of energy. A paraffin-based nanoparticle containing various volume fractions of Cu was applied. The suspended nanoparticles caused an increase in thermal conductivity of nanoparticles enhanced phase change material (NEPCM) compared to conventional PCM, resulting in heat transfer enhancement and a higher melting rate. The higher temperature …

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Improving Air Cooling Efficiency Of 2ou High-End Web Server By Using Bigger Rack Level Fans And Controlling Flow Using Bimetallic Strips, Ravi Teja Mutyala Jan 2014

Improving Air Cooling Efficiency Of 2ou High-End Web Server By Using Bigger Rack Level Fans And Controlling Flow Using Bimetallic Strips, Ravi Teja Mutyala

Mechanical and Aerospace Engineering Theses - Archive

Due to the doubling of processing power ever so often, designing an efficient thermal management system for database centers is becoming more and more difficult. Two studies have been done, one on air cooling using bigger rack level fans and another in liquid cooling minimizing the size of flow control devices. Fans are one of the most inefficient and power hungry devices used in an air cooled database center. Study has been done to improve the air cooling efficiency using larger rack level fans on 2OU open compute server. Simulations have been done using commercial computational fluid dynamic (CFD) software …

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Composite Materials Equivalent Properties In Lamina, Laminate, And Structure Levels, Kamran Tavakoldavani Jan 2014

Composite Materials Equivalent Properties In Lamina, Laminate, And Structure Levels, Kamran Tavakoldavani

Mechanical and Aerospace Engineering Theses - Archive

Increasing use of thick composite structures requires a large model for structural analysis. In the analysis, equivalent properties of composites are often used. The equivalent properties of a composite are defined as the properties of a homogeneous orthotropic composite to representative an anisotropic heterogeneous composite material.A set of equations for equivalent mechanical and thermal properties in lamina and laminate as well as structures was developed. The developed model for lamina and laminate of composite was based upon the equivalent structural characteristics of 0? lamina and homogenized 0? laminate for lamina and laminate level, respectively. The concept of narrow beam was …

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Evaluating Heat Sink Performance In An Immersion-Cooled Server System, Trevor Dean Mcwilliams Jan 2014

Evaluating Heat Sink Performance In An Immersion-Cooled Server System, Trevor Dean Mcwilliams

Mechanical and Aerospace Engineering Theses - Archive

As operating power within server systems continues to increase in support of increased data usage across networks worldwide, it is necessary to explore options outside of traditional air-cooled systems. In this study, a specific server will be immersed and cooled using circulated mineral oil. The challenges associated with an emerging cooling technology are numerous. Trying to adapt existing air-cooled systems into oil-cooled systems has its difficulties. The viscous properties of oil make it resistive to traveling through the narrow fins of a conventional heat sink, and thermal mixing is not easy to achieve as it is in air due to …

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Optimal Design Variable Considerations In The Use Of Phase Change Materials In Indirect Evaporative Cooling, Ankit Paul Chilakapaty Jan 2014

Optimal Design Variable Considerations In The Use Of Phase Change Materials In Indirect Evaporative Cooling, Ankit Paul Chilakapaty

Mechanical and Aerospace Engineering Theses - Archive

The demand for sustainable, energy efficient and cost effective heating and cooling solutions is exponentially increasing with the rapid advancement of computation and information technology. Use of latent heat storage materials also known as phase change materials (PCMs) for load leveling is an innovative solution to the data center cooling demands. These materials are commercially available in the form of microcapsules dispersed in water, referred to as the microencapsulated phase change slurries and have higher heat capacity than water. The composition and physical properties of phase change slurries play significant role in energy efficiency of the cooling systems designed implementing …

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Modeling And Simulation Of Nanofluid For Heat Storage, Yatish Nagaraj Jan 2014

Modeling And Simulation Of Nanofluid For Heat Storage, Yatish Nagaraj

Mechanical and Aerospace Engineering Theses - Archive

This work models the dynamic behavior of molten nitrate salt mixture to investigate the formation of interfacial nanostructures in ionic liquid nano-fluids which is responsible for increase of heat capacity of the mixture. A key application of these fluids is in heat storage in solar collector where the heat capacity determines the amount of energy storage and therefore the efficiency of a solar collector system. The heat capacity can be significantly increased by the addition of a small amount of nanoparticles, of radius 1 to 100 nanometers in a concentration of approximately 1 by weight. This increase appears to be …

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Experimental Testbed For Robot Skin Characterization And Interaction Control, Kyle Shook Jan 2014

Experimental Testbed For Robot Skin Characterization And Interaction Control, Kyle Shook

Mechanical and Aerospace Engineering Theses - Archive

This thesis presents the research and work we conducted with an experimental testbed designed for testing and characterizing various types of robot skin with tactile sensing. The main goal of this research is to develop reduced-order models of robot skin for use in physical human-robot interaction simulations. The reduced-order models are developed from data collected by the testbed. The experimental testbed presented is designed around a National Instruments compactRIO (cRIO). The cRIO controls and reads from a linear actuator and can collect synchronous measurements from multiple force sensors. The software developed for different test scenarios is also presented. Experiments were …

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Multi-Variable Design Optimization Of A Contemporary Cold Plate For A Fixed Pumping Power For Minimizing The Thermal Resistance, Pratik Kekre Jan 2014

Multi-Variable Design Optimization Of A Contemporary Cold Plate For A Fixed Pumping Power For Minimizing The Thermal Resistance, Pratik Kekre

Mechanical and Aerospace Engineering Theses - Archive

Due to reliability concerns, thermal management of microprocessors has and continues to become a major challenge in electronic packaging. High circuit densities in modern integrated circuit semiconductor devices require the heat generated by their operation be efficiently removed, in order to maintain the temperatures of the device within limits which will consequently follow the design guideline for operating parameters.Air-cooling is still the preferred method of cooling electronic systems and especially in terms of cost. Air cooling, however, is starting to reach its limits for some of the higher end electronic systems and as such there is a need to investigate …

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Board Level Reliability Assessment Of Thick Fr-4 Qfn Assemblies Under Thermal Cycling, Tejas Shetty Jan 2014

Board Level Reliability Assessment Of Thick Fr-4 Qfn Assemblies Under Thermal Cycling, Tejas Shetty

Mechanical and Aerospace Engineering Theses - Archive

Quad Flat No-Lead (QFN) packages gained popularity in the industry during the last decade or so due to its superior thermal/electrical characteristics, low cost and compact size. QFN packages are widely used in handheld devices where space is a constraint; however, some customers require it for industry application demanding thicker printed circuit boards (PCB's). As the thickness of PCB increases, the fatigue life (MTTF) of the solder joints decreases. QFN being a leadless package, its board level thermo-mechanical reliability is a critical issue. This provides the motivation for this work. The QFN package on thick board was experimentally characterized under …

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Computational Analysis Of A Multistage Axial Compressor, Chaithanya Mamidoju Jan 2014

Computational Analysis Of A Multistage Axial Compressor, Chaithanya Mamidoju

Mechanical and Aerospace Engineering Theses - Archive

Turbo machines are used extensively in Aerospace, Power Generation, and Oil & Gas Industries. Efficiency of these machines is often an important factor and has led to the continuous effort to improve the design to achieve better efficiency. The axial flow compressor is a major component in a gas turbine with the turbine's overall performance depending strongly on compressor performance. Traditional analysis of axial compressors involves throughflow calculations, isolated blade passage analysis, Quasi-3D blade-to-blade analysis, single-stage (rotor-stator) analysis, and multi-stage analysis involving larger design cycles. In the current study, the detailed flow through a 15 stage axial compressor is analyzed …

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Reduced Order Modeling Of Low-Temperature Gas Discharges In Glow Mode, Esteban Cisneros Jan 2014

Reduced Order Modeling Of Low-Temperature Gas Discharges In Glow Mode, Esteban Cisneros

Mechanical and Aerospace Engineering Theses - Archive

Gas discharge actuation of fluid dynamics phenomena has garnered significantattention in recent years due to their low-power requirements andtheir geometrical simplicity, amongst others. However, many of their actuationmechanisms and physical couplings are still not well-understood,calling for numerical efforts to address many of theseproblems. Modeling and simulation of plasma-flow interaction is anexhaustive task because of the multi-physics, multi-scale nature ofthe problem. One particular concern is the appropriate modeling of thedischarge detailed chemistry in order to reduce the computationalcost associated with it while capturing all of its finest features. \\Modern reduction techniques attempt to create reduced-order models ofchemical kinetics by identifying low-dimensional …

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Development Of A Conceptual Design Weight Estimation Method Library And Documentation, Andrew S. Walker Jan 2014

Development Of A Conceptual Design Weight Estimation Method Library And Documentation, Andrew S. Walker

Mechanical and Aerospace Engineering Theses - Archive

The state of the art in estimating the volumetric size and mass of flight vehicles is held today by an elite group of engineers in the Aerospace Conceptual Design Industry. This is not a skill readily accessible or taught in academia. To estimate flight vehicle mass properties, many aerospace engineering students are encouraged to read the latest design textbooks, learn how to use a few basic statistical equations, and plunge into the details of parametric mass properties analysis. Specifications for and a prototype of a standardized engineering "tool-box" of conceptual and preliminary design weight estimation methods were developed to manage …

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Dynamic Simulation Of Multibody Systems In Simultaneous, Indeterminate Contact And Impact With Friction, Adrian Rodriguez Jan 2014

Dynamic Simulation Of Multibody Systems In Simultaneous, Indeterminate Contact And Impact With Friction, Adrian Rodriguez

Mechanical and Aerospace Engineering Dissertations - Archive

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 environment. This environment involves conditions, such as contact, impact and friction. Numerical simulation provides an easy way to perform numerous iterations with varying conditions, which is more cost effective than building equivalent experimental setups. The developed framework will serve as a tool for engineers and scientists to gain some insight on predicting how a system may behave. The current field of research in multibody system dynamics lacks …

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Design And Fabrication Of Microfluidic Photoelectrochemical Reactors For Efficient Conversion Of Carbon Dioxide To Liquid Fuel, Homayon Homayoni Jan 2014

Design And Fabrication Of Microfluidic Photoelectrochemical Reactors For Efficient Conversion Of Carbon Dioxide To Liquid Fuel, Homayon Homayoni

Mechanical and Aerospace Engineering Dissertations - Archive

The world's energy demand is expected to increase dramatically over the next few decades. At the same time the availability of cheap fossil fuels is expected to decrease. In addition to the increase in energy cost, the use of fossil fuels results in the release of greenhouse gases into the atmosphere. A lot research effort has been invested in the development of renewable energy resources that are cost competitive, sustainable, and emission free. Although these renewable technologies are available, many are not implemented widely due low efficiency and high capital cost. Therefore, fossil fuels are expected to remain a major …

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Enhancement Of Pool Boiling And Evaporative Heat Transfer Using High Temperature Thermally Conductive Microporous Coatings, Ajay Gurung Jan 2014

Enhancement Of Pool Boiling And Evaporative Heat Transfer Using High Temperature Thermally Conductive Microporous Coatings, Ajay Gurung

Mechanical and Aerospace Engineering Dissertations - Archive

The present research is an experimental study of the enhancement of pool boiling and evaporative heat transfer using high temperature thermally conductive microporous coatings. Two major types of coatings were investigated: one that is based on copper powders on copper substrate and the other on aluminum powders on aluminum substrate. Both coatings were easy to fabricate with low costs compared to conventional sintering and plasma spraying techniques, yet have high bonding strength and some of them can operate at temperatures up to 670 oC. Multiple coating options were fabricated and tested in pool boiling of water in order to optimize …

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Experimental Study Of Separated Ramp-Induced Shock/Boundary-Layer Interaction With Upstream Micro-Vortex Generator At Mach 2.5, Yusi Shih Jan 2014

Experimental Study Of Separated Ramp-Induced Shock/Boundary-Layer Interaction With Upstream Micro-Vortex Generator At Mach 2.5, Yusi Shih

Mechanical and Aerospace Engineering Dissertations - Archive

Shock wave/boundary layer interactions (SBLIs) are important issues for high-speed vehicles. SBLIs reduce the performance of aerodynamic surfaces and engine inlets, amongst a number of adverse effects. Micro-vortex generators (MVGs) are a flow control method with strong potential to mitigate the effects of SBLI by energizing the boundary layer through momentum transfers from the freestream. They have been implemented in actual configurations at low speeds. The present research includes a combined experimental and theoretical analysis of the evolution of the perturbation downstream the MVG, the formation of vortices, and their interaction with the shock front. Experiments were performed with a …

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Analytical Solutions Of Steady-State Heat Conduction In Multi-Layer Stack Packaging, Saeed Ghalambor Jan 2014

Analytical Solutions Of Steady-State Heat Conduction In Multi-Layer Stack Packaging, Saeed Ghalambor

Mechanical and Aerospace Engineering Dissertations - Archive

Analytical models that can be utilized in modeling the steady-state temperature solutions of planar and 3D packaged integrated circuits are discussed. This mathematically-driven model will include solutions for uniform and non-uniform footprint die stack systems as well as planar flip chip packages. These analytically obtained temperature solutions will include the contribution of thermal resistance for both cases as well as perfect contact scenarios. The acquired solution will accommodate any kind of boundary conditions (first, second and third kind) on the top and bottom surfaces of the stack system with the sides being adiabatic. Furthermore, the algorithm developed will consider volumetric …

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