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Articles 2551 - 2580 of 3234
Full-Text Articles in Mechanical Engineering
Ceramic Matrix Composite Characterization Under A Combustion And Loading Environment, Andrew R. Nye
Ceramic Matrix Composite Characterization Under A Combustion And Loading Environment, Andrew R. Nye
Theses and Dissertations
Lightweight materials that can withstand high temperatures and corrosive environments are constantly sought after in the aerospace industry, typically for Gas Turbine Engine (GTE) application. These materials need to retain their strength throughout the long service period they would see in the combustor and turbine components of a GTE. One material that is ideal for these types of applications is an oxide/oxide Ceramic Matrix Composite (CMC). The fatigue behavior of the oxide/oxide CMC NextelTM 720/Alumina (N720/A) was investigated in a unique high temperature environment. N720/A consisted of an 8-harness satin weave of NextelTM aluminum oxide/silicon oxide fibers bound …
A System For Measuring The Lift And Drag Forces Of A Spinning Golf Ball Held Fixed Within A Wind Tunnel, Ryan R. Miller
A System For Measuring The Lift And Drag Forces Of A Spinning Golf Ball Held Fixed Within A Wind Tunnel, Ryan R. Miller
Master's Theses
A system was designed, built and tested in order to test the aerodynamic properties of a standard golf ball in a wind tunnel manufactured by ELD, Inc. model 406(B). The system consists of a rotating shaft, on which the golf ball is attached, connected to a two-axis force transducer. Additionally, an automated data acquisition system was built for enhanced precision of measurements. Data for wind speeds up to 160 ft/s and rotational speeds up to 8,600 rpm were obtained and analyzed. The purpose of the designed apparatus was to allow for studies to better understand the lift and drag coefficients …
Ipas: International Paper Airplanes In Space, Getaway Special Team 2009
Ipas: International Paper Airplanes In Space, Getaway Special Team 2009
Reports and Proposals
No abstract provided.
Funboe Factsheet, Getaway Special Team 2009
Funboe Factsheet, Getaway Special Team 2009
Reports and Proposals
No abstract provided.
Sides: Space Italian Dressing Experimental Setup, Getaway Special Team 2009
Sides: Space Italian Dressing Experimental Setup, Getaway Special Team 2009
Reports and Proposals
No abstract provided.
Gathering Leadership Momentum Across Great Distances: Creating An Online Community Of Practice, Erin Dini-Davis, Danielle Theiss-White
Gathering Leadership Momentum Across Great Distances: Creating An Online Community Of Practice, Erin Dini-Davis, Danielle Theiss-White
Library Faculty & Staff Publications
At the 2007 Mountain Plains Library Association Leadership (MPLA) Institute, held in New Mexico, USA, eight academic librarians formed an online multi-state, multigenerational community of practice. MPLA is a twelve-state library association within the United States. Using Google Groups™, the members formed an online environment called the MPLA Community of Practice for continuing development of the leadership skills presented at the Institute. These early-career librarians represent diverse educational backgrounds and work in libraries serving varied populations with differing disciplinary emphases. The group meets monthly with each member preparing and facilitating online discussions, complete with personal assessments, topical readings, and questions. …
Rembrant: Research On The Effects Of Microgravity On The Brazil Nut Problem, Getaway Special Team 2009
Rembrant: Research On The Effects Of Microgravity On The Brazil Nut Problem, Getaway Special Team 2009
Reports and Proposals
No abstract provided.
Pool Boiling Heat Transfer Characteristics Of Nanofluids And Nanocoatings, Sang Muk Kwark
Pool Boiling Heat Transfer Characteristics Of Nanofluids And Nanocoatings, Sang Muk Kwark
Mechanical and Aerospace Engineering Dissertations - Archive
This research is a qualitative and quantitative investigation to understand the behaviors of nanofluids and nanocoated surfaces during pool boiling heat transfer. The pool boiling behavior of low concentration nanofluids, a mixture created by dispersing nanoparticles in pure water, was experimentally studied over a flat heater. A majority of this work was conducted using Al₂O₃ nanoparticles dispersed in water and some minor work was performed with others (CuO and diamond nanoparticles). Results from this study are consistent with those previously reported in demonstrating that boiling of nanofluids produces a nanocoating on the heater surface, and which in turn increases the …
Cae Tools For Modeling Inertia And Aerodynamic Properties Of An R/C Airplane, Kartik Kiran Parikh
Cae Tools For Modeling Inertia And Aerodynamic Properties Of An R/C Airplane, Kartik Kiran Parikh
Mechanical and Aerospace Engineering Theses - Archive
Recently there has been significant research in the field of Unmanned Aerial Vehicles (UAV). For efficient deployment and operation of these vehicles, it is imperative that one understands the physical system. This in turn involves one to design efficient control algorithms for implementation in these platforms. Thus we need algorithms and methods that identify the physical system parameters, that in turn can be used to design robust model based control systems. This thesis employs CAE software such as SolidWorks, GAMBIT and FLUENT to calculate the aerodynamic coefficients and moment of inertia. The aerodynamic coefficients are analyzed to understand the sensitivity …
Analysis Of Data Center Cooling Strategies And The Impact Of The Dynamic Thermal Management On The Data Center Efficiency, Veerendra Prakash Mulay
Analysis Of Data Center Cooling Strategies And The Impact Of The Dynamic Thermal Management On The Data Center Efficiency, Veerendra Prakash Mulay
Mechanical and Aerospace Engineering Dissertations - Archive
The power trend for Server systems continues to grow thereby making thermal management of Data centers a very challenging task. Although various configurations exist, the raised floor plenum with Computer Room Air Conditioners (CRACs) providing cold air is a popular operating strategy. The air cooling of data center however, may not address the situation where more energy is expended in cooling infrastructure than the thermal load of data center. Revised power trend projections by ASHRAE TC 9.9 predict heat load as high as 5000W per square feet of compute servers' equipment footprint by year 2010. These trend charts also indicate …
Development Of A Quantum Dot Mediated Thermometry For Minimally Invasive Thermal Therapy, Willard L. Hanson
Development Of A Quantum Dot Mediated Thermometry For Minimally Invasive Thermal Therapy, Willard L. Hanson
Mechanical and Aerospace Engineering Dissertations - Archive
Thermally-related, minimally invasive therapies are designed to treat tumors while minimizing damage to the surrounding tissues. Adjacent tissues become susceptible to thermal injury to ensure the cancer is completely destroyed. Destroying tumor cells, while minimizing collateral damage to the surrounding tissue, requires the capacity to control and monitor tissue temperatures both spatially and temporally. Current devices measure the tumor's tissue temperature at a specific location leaving the majority unmonitored. A point-wise application can not substantiate complete tumor destruction. This type of surgery would be more effective if volumetric tissue temperature measurement were available. On this premise, the feasibility of a …
Fabrication Of Plga Nanocomposite Using Two Photon Polymerization, Nikhil Narendra Kavadia
Fabrication Of Plga Nanocomposite Using Two Photon Polymerization, Nikhil Narendra Kavadia
Mechanical and Aerospace Engineering Theses - Archive
The demand of smaller size 3D structures in scale of several nanometers has significantly increased the need of development of new techniques for micro/nano fabrication. Applications of nanomaterial embedded true 3D micro/nano structures in the field of medicine, tissue engineering, scaffolding, drug delivery, antibacterial implants or catheters, modification of textiles and refinement of polymers has opened new areas of research for fabrication of nanocomposites embedded with engineering nanoparticles.A novel fabrication process called two photon polymerization (2PP) is employed for the fabrication of polymeric nanocomposites embedded with PLGA nanoparticles. An ultra short pulsed laser source is used to produce laser at …
Dymore Finite Element Analysis Of The Paired Blade Tiltrotor Conceptual Design And A Comparable Conventional Tiltrotor Design, David Orion Braziel
Dymore Finite Element Analysis Of The Paired Blade Tiltrotor Conceptual Design And A Comparable Conventional Tiltrotor Design, David Orion Braziel
Mechanical and Aerospace Engineering Theses - Archive
Increasing the solidity of tiltrotors above that of current designs presents challenges associated with control system packaging and control couplings. The paired blade rotor concept addresses these issues by placing two blades that share a pitch link, located for acceptable control coupling, on each of three hub arms.Dymore finite element models of the paired blade rotor and a reference rotor of equal solidity with six evenly spaced blades were developed to identify any potential design flaws of the paired blade rotor associated with rotor frequency placement or control couplings. The finite element rotor models are documented, and the results of …
Numerical Simulation Of Particle Adhesion Dynamics For Applications In Nanomedicine And Biosensing, Samar Shah
Numerical Simulation Of Particle Adhesion Dynamics For Applications In Nanomedicine And Biosensing, Samar Shah
Mechanical and Aerospace Engineering Theses - Archive
Multifunctional nanoparticles hold considerable promise as the next generation of medicine that allow for detection of early on-set of diseases and targeted therapy with minimal toxicity. To achieve targeted drug delivery, nanoparticles are usually functionalized with certain ligands (polymers) that bind specifically to a particular type of receptors on the endothelial cell surface, which are expressed exclusively during its diseased state. The ligand coated nanoparticles, loaded with drugs inside, transport in blood stream, and adhere to diseased cells via specific adhesion. However, this whole procedure becomes complicated due to simultaneous involvement of hydrodynamic force, adhesion force and Brownian force. In …
Dynamic Stress From Transverse Impact On Flexural Beams, Joshua Ballard
Dynamic Stress From Transverse Impact On Flexural Beams, Joshua Ballard
Mechanical and Aerospace Engineering Theses - Archive
Accurate prediction of stress from impact would be very useful to an engineer in the design and analysis phases of a project. Currently one must resort to finite element analysis and experimentation, both of which have their negatives. Classical hand analysis methods such as the work-energy method overestimate the stress for a weight dropped onto the tip of a cantilevered beam. The goal of this project was to formulate analytical equations that were straightforward and easy to implement that would more accurately predict the dynamic stress in this scenario. Using the already derived equations from the work-energy method, a modification …
Improving Receiver Station-Keeping In Aerial Refueling By Formulating Tanker Motion As Disturbance, Christopher Michael Elliott
Improving Receiver Station-Keeping In Aerial Refueling By Formulating Tanker Motion As Disturbance, Christopher Michael Elliott
Mechanical and Aerospace Engineering Theses - Archive
During aerial refueling operations, the receiver aircraft should hold position within a “refueling box” to maintain the boom-receptacle connection while the tanker aircraft flies in a racetrack maneuver. Prior research work shows, especially in turns, significant difficulty resides in meeting y-deviation requirements, i.e., to stay within the box in the lateral direction. This observation indicates tanker motion as “the biggest disturbance” in turn. The nonlinear equations of motion for the receiver aircraft used in this work are developed in terms of position and orientation states relative to the tanker. Linearization results in a set of equations with tanker motion clearly …
On The Design Of A Biodegradable Poc-Ha Polymeric Cardiovascular Stent, Joonas Ilmari Ponkala
On The Design Of A Biodegradable Poc-Ha Polymeric Cardiovascular Stent, Joonas Ilmari Ponkala
Mechanical and Aerospace Engineering Theses - Archive
The current state of the art in coronary stent technology is mainly populated by metallic stents usually coated with certain drugs to increase biocompatibility, even though experimental biodegradable stents have appeared in the horizon. To design stents from biodegradable polymers one must accurately characterize their mechanical behavior for analysis and optimization.This manuscript presents the process for evaluating the material properties for biodegradable biocompatible POC-HA polymeric composite, techniques for developing the stent models for finite element analysis, and development of material models for finite element analysis. The developed material models were utilized in finite element analysis to evaluate the suitability of …
Finite Element Analysis Of Forging, Aditya Ashok Battin
Finite Element Analysis Of Forging, Aditya Ashok Battin
Mechanical and Aerospace Engineering Theses - Archive
Numerical modeling and simulation of metal forming is very effective in saving production time, effort and economy and has thus gained prominence in many industries all over the world. In metal-forming finite element analysis, software like Deform, Qform, Forge, Simufact, Hyperform are used extensively for the forming analysis. Apart from having narrow applications, these softwares are expensive. The object of this study was to examine the robustness of general package softwares in regards to forging. Software such as Abaqus and Ansys LSDyna were used to simulate the forging process. The case examined was that of a circular metal disc restrained …
Multi Objective Optimization Of Graphite Heat Spreader For Portable Systems Application, Arijit Banerjee
Multi Objective Optimization Of Graphite Heat Spreader For Portable Systems Application, Arijit Banerjee
Mechanical and Aerospace Engineering Theses - Archive
The advancement made in portable electronic systems has primarily been due to miniaturization of electronic systems. This in turn leads to an increase in power density which leads to higher temperatures and formation of hot spots. There is a temperature specification of system surfaces for human comfort (such as the surface close to a keyboard on laptops). Challenge in cooling portable devices is that there is not enough room to accommodate heat sinks. It is therefore important to have heat spreaders that can transfer the heat from critical devices to regions where cooling is available. Traditionally, copper has been the …
A Numerical Study On The Dynamics Of Bubble Growth And Detachment From An Orifice, Sheshi Kumar Takkallapally
A Numerical Study On The Dynamics Of Bubble Growth And Detachment From An Orifice, Sheshi Kumar Takkallapally
Mechanical and Aerospace Engineering Theses - Archive
The study of bubble formation from an orifice finds numerous industrial applications which include bubble acoustics in ocean physics and chemical reactors. Numerical simulations have been performed to investigate the dynamics of bubble formation, growth and detachment from an orifice. The full transient Navier - Stokes equation is solved in a two-dimensional axi-symmetrical coordinate system. The surface tension implementation algorithm known as the Pressure Boundary Method (PBM) is used to model the surface tension. The robustness of PBM method on Two-Phase flows with different conditions has been shown. The results achieved by numerical simulations have been compared with the available …
Heat Transfer Analysis Of A Pulse Detonation Engine, Neelima Kalidindi
Heat Transfer Analysis Of A Pulse Detonation Engine, Neelima Kalidindi
Mechanical and Aerospace Engineering Theses - Archive
A thermal analysis of the effect of sensible heat release on the walls of the detonation chamber for stoichiometric mixtures of hydrogen/air, octane/air and octane/oxygen was presented. The detonation tube was assumed to operate at 20 Hz and cooled by a water jacket to dissipate the heat from the walls which ensures the effective operation for a longer period. Wall material was assumed to be made of copper because of its high thermal conductivity.The study showed a slow temperature rise along the walls of the combustion chamber for multiple pulses. It can be concluded that due to the space-time averaging …
Thermal Conduction Equations For A Medium With An Inclusion Using Galerkin Method, Thiagarajan Sivalingam
Thermal Conduction Equations For A Medium With An Inclusion Using Galerkin Method, Thiagarajan Sivalingam
Mechanical and Aerospace Engineering Theses - Archive
The Galerkin method is used to semi-analytically solve the heat conduction equation in non-homogeneous materials. The problem under deliberation is a square plate with a circular inclusion having different thermal conductivities. A generalized procedure that involves the Galerkin method and formulation of the final solution in terms of the procured base functions is adopted. The Galerkin method basically involves expressing the given boundary value problem in terms of a standard mathematical relation, generating a set of continuous base functions, formulating the matrix equation, and determining the solution.For the non-homogeneous material, a set of base functions for the plate and inclusion …
Structural Optimization Using Ansys Classic And Radial Basis Function Based Response Surface Models, Vijay Krishna
Structural Optimization Using Ansys Classic And Radial Basis Function Based Response Surface Models, Vijay Krishna
Mechanical and Aerospace Engineering Theses - Archive
This thesis describes a methodology to develop an effective and simple structural optimization method using Response Surfaces. It also further demonstrates how these Response Surfaces can then be utilized for further Multi Objective Optimization. The true or exact responses were calculated using Ansys Classic while the codes for the training and simulation of Response Surface is pro-grammed in Matlab. Initially we used a Halton sequence to generate a DOE of the design variables. Then we used Ansys Classic to generate the exact responses. Once the responses were imported the Response Surface are generated using a RBF approximation model. This RBF …
Electrowetting On Dielectric (Ewod) Digital Microfluidics For Electronic Hotspot Cooling, Govindraj Shreyas Bindiganavale
Electrowetting On Dielectric (Ewod) Digital Microfluidics For Electronic Hotspot Cooling, Govindraj Shreyas Bindiganavale
Mechanical and Aerospace Engineering Theses - Archive
Electronics cooling was a field dominated by bulky and heavy heat sinks, heat pipes and fans for decades. Lately, the size of the electronic components has decreased to a substantial extent with an increase in performance. This has fuelled a need for smaller, lighter, yet efficient cooling systems. A lot of research has been done to build innovative cooling solutions which satisfied most of the requirements as stated above. Some of them still have limitations like use of the right coolants and design challenges. Digital microfluidics is one field which can solve all these issues by providing a simple, reliable …
A Unified Analysis Of Stiffener Reinforced Composite Beams With Arbitrary Cross-Section, Gianfranco Rios
A Unified Analysis Of Stiffener Reinforced Composite Beams With Arbitrary Cross-Section, Gianfranco Rios
Mechanical and Aerospace Engineering Dissertations - Archive
A number of methods are available to analyze the laminated composite beams using smear property of laminate stiffness ignoring unsymmetrical behavior of laminates. Some include their effect of laminate but did not include the unsymmetrical effect of the cross-section of the beam. On the other hand, using finite element method to analyze the beam is dependent on the structural configurations including the laminate lay-up sequence. An analytical method was developed from lamination theory in order to study the structural response of composite laminated beams. The present method is capable of predicting the axial and bending stiffnesses, the centroid location, and …
A Generic Methodology For Flight Test And Safety Evaluation At Conceptual Design, Amit R. Oza
A Generic Methodology For Flight Test And Safety Evaluation At Conceptual Design, Amit R. Oza
Mechanical and Aerospace Engineering Theses - Archive
The current research is dedicated to the application of a simulation suite that emulates flight testing and is applicable to the aircraft conceptual and preliminary design environment. The configuration concept available for study is an unmodified Cessna Citation X. The research goal is to arrive at a systematic process that reduces aircraft design risk while creating transparency for the manager and engineer during product life-cycle simulation. When integrating the discipline of flight test emulation into the development methodology, the objective is to complement and enrich the design simulation through a correct representation of flight safety relevant disciplines like aircraft certification, …
High Temperature Microporous Coatings: The Effects Of Wetting And Wicking On Nucleate Boiling And Chf, Ross Evan Pivovar
High Temperature Microporous Coatings: The Effects Of Wetting And Wicking On Nucleate Boiling And Chf, Ross Evan Pivovar
Mechanical and Aerospace Engineering Theses - Archive
Porous coatings have long been a method to enhance boiling heat transfer. Previous researchers have thoroughly explained most of the physics behind the enhancement, but some holes still exist. Correlations, setup to predict nucleate boiling, are often only accurate in specific scenarios. CHF correlations that take into account wettability do not consider microstructure changes that decrease contact angle, but do not enhance CHF. A solution to these problems is presented via the wicking and wetting of liquid on a porous surface. CHF is found to be enhanced with increases in wicking speeds and flow rate. Wetting, measured by apparent contact …
Topology Optimization Using Hyper Radial Basis Function Network, Aditya P. Apte
Topology Optimization Using Hyper Radial Basis Function Network, Aditya P. Apte
Mechanical and Aerospace Engineering Dissertations - Archive
Topology optimization has been conventionally used in automobile and aerospace industries to produce lightweight structures for minimum compliance or maximum fundamental frequency. Today, topology optimization finds application in solving diverse types of problems ranging from medicine to consumer products. Popular continuum based method SIMP fails to provide global solution due to too many variables involved. In this work, a novel hyper radial basis function network is presented as topology description function. The proposed approach provides drastic reduction in number of design variables involved in topology optimization. This makes the use of heuristic global solution possible. Parallel processing, reanalysis formulation and …
Optimal-Control Theoretic Methods For Optimization And Regulation Of Distributed Parameter Systems, Jennifer Dawn Goss
Optimal-Control Theoretic Methods For Optimization And Regulation Of Distributed Parameter Systems, Jennifer Dawn Goss
Mechanical and Aerospace Engineering Dissertations - Archive
Optimal control and optimization of distributed parameter systems are discussed in the context of a common control framework. The adjoint method of optimization and the traditional linear quadratic regulator implementation of optimal control both employ adjoint or costate variables in the determination of control variable progression. As well both theories benefit from a reduced order model approximation in their execution. This research aims to draw clear parallels between optimization and optimal control utilizing these similarities. Several applications are presented showing the use of adjoint/costate variables and reduced order models in optimization and optimal control problems. The adjoint method for shape …
Transient Flow Analysis Of Filling In Pulse Detonation Engine, Veera Venkata Suneel Jinnala
Transient Flow Analysis Of Filling In Pulse Detonation Engine, Veera Venkata Suneel Jinnala
Mechanical and Aerospace Engineering Theses - Archive
The Pulse Detonation Engine (PDE) is considered to be a propulsion system of future air vehicles. The objective of the present study is to model an efficient inlet system for filling the detonation tube completely with the fuel/air mixture. In the present study the filling processes is modeled numerically using CFD code FLUENTTM. Calculations for the gas flow are carried out by solving the Navier-Stokes equations coupled with the k- ? turbulence model. Five different inlet configurations were proposed and simulated in both two-dimensionally and three-dimensionally. The model with an orifice plate at the inlets ensured the desired optimum results. …