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Articles 2371 - 2400 of 3234
Full-Text Articles in Mechanical Engineering
Effects Of Heat Flux On Nucleate Boiling In Microgravity, Andrew Fassman
Effects Of Heat Flux On Nucleate Boiling In Microgravity, Andrew Fassman
Presentations
No abstract provided.
The Design And Construction Of A Microgravity Boiling Experiment, Troy Munro
The Design And Construction Of A Microgravity Boiling Experiment, Troy Munro
Presentations
No abstract provided.
Study Of Emission Turbulence-Radiation Interaction In Hypersonic Boundary Layers, L. (Lian) Duan, M. P. Martín, I. Sohn, D. A. Levin, M. F. Modest
Study Of Emission Turbulence-Radiation Interaction In Hypersonic Boundary Layers, L. (Lian) Duan, M. P. Martín, I. Sohn, D. A. Levin, M. F. Modest
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Direct numerical simulations are conducted to study the effects of emission turbulence-radiation interaction in hypersonic turbulent boundary layers, representative of the Orion Crew Exploration Vehicle at peak-heating condition during reentry. A nondimensional governing parameter to measure the significance of emission turbulence-radiation interaction is proposed, and the direct numerical simulation fields with and without emission coupling are used to assess emission turbulence-radiation interaction. Both the uncoupled and coupled results show that there is no sizable interaction between turbulence and emission at the hypersonic environment under investigation. An explanation of why the intensity of emission turbulence-radiation interaction in the hypersonic boundary layer …
Nanostructured Substrate With Nanoparticles Fabricated By Femtosecond Laser For Surface-Enhanced Raman Scattering, Yukun Han, Zhi Liang, Huilai Sun, Hai Xiao, Hai-Lung Tsai
Nanostructured Substrate With Nanoparticles Fabricated By Femtosecond Laser For Surface-Enhanced Raman Scattering, Yukun Han, Zhi Liang, Huilai Sun, Hai Xiao, Hai-Lung Tsai
Electrical and Computer Engineering Faculty Research & Creative Works
A Simple and Fast Method to Fabricate Nanostructured Substrates with Silver Nanoparticles over a Large Area for Surface-Enhanced Raman Scattering (SERS) is Reported. the Method Involves Two Steps: (1) Dip the Substrate into a Silver Nitrate Solution for a Few Minutes, Remove the Substrate from the Solution, and Then Air Dry and (2) Process the Silver Nitrate Coated Substrate by Femtosecond (Fs) Laser Pulses in Air. the Second Step Can Create Silver Nanoparticles Distributed on the Nanostructured Surface of the Substrate by the Photoreduction of Fs Multiphoton Effects. This Study Demonstrates that an Enhancement Factor (EF) Greater Than 5x105, Measured …
Get Away Special: Microgravity Research Team, Getaway Special Team
Get Away Special: Microgravity Research Team, Getaway Special Team
Education and Outreach
No abstract provided.
Report For 2011 Urco Funded Experiment: Development Of Optimal Bubble-Seeding Microheaters To Study Nucleate Boiling Heat Transfer In Microgravity, Ryan Martineau
Reports and Proposals
No abstract provided.
Development Of Optimal Bubble-Seeding Microheaters To Study Nucleate Boiling Heat Transfer In Microgravity, Ryan Martineau
Development Of Optimal Bubble-Seeding Microheaters To Study Nucleate Boiling Heat Transfer In Microgravity, Ryan Martineau
Reports and Proposals
No abstract provided.
Preliminary Design Of A Pressurization System For Small Bipropellant Rocket Engines, Steven Stanley
Preliminary Design Of A Pressurization System For Small Bipropellant Rocket Engines, Steven Stanley
Mechanical and Aerospace Engineering Dissertations - Archive
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 industry, namely high development costs and resistance to change, the new approach needed to be as simple and robust as possible. After reviewing several different potential methodologies, a concept was developed from first principles based on small gas turbine engine fuel injection approaches. The concept is simple and has heritage in the field of gas turbine engines, but it is new for the field of rocket …
Analysis Of Pulse Detonation Turbojet Engines, Ronnachai Vutthivithayarak
Analysis Of Pulse Detonation Turbojet Engines, Ronnachai Vutthivithayarak
Mechanical and Aerospace Engineering Dissertations - Archive
Research over the last two decades has shown the potential advantages of pulse detonation engines (PDEs) over existing aero-engines in terms of improved thermodynamics efficiency, improved thrust performance, simplicity of design, and exibility to operate over a wide speed range. The inherently unsteady characteristic of PDEs makes it difficulty to analyze and evaluate their performance. The conventional method that relies on steady-state assumptions cannot be directly applied. PDE studies have to employ unsteady gasdynamics behavior. In this study, the thermodynamic cycle of a PDE, which can be called the ZND cycle, is theoretically analyzed. A parametric analysis of turbojet PDEs …
Mode Truncation Analysis In Forced Response Of Structural Dynamics, Sravan Kumar Neela
Mode Truncation Analysis In Forced Response Of Structural Dynamics, Sravan Kumar Neela
Mechanical and Aerospace Engineering Theses - Archive
Mode truncation in Modal analysis is an important problem and should be addressed with an effective truncation criterion. The truncation errors are considered as error forces and these error limits can be used to select the number of modes in the solution. Usually frequency based approach is used in selection of modes. But this method ignores the error forces in truncation and not effective if the cutoff frequency is greater than highest natural mode. An effective criterion would limit error forces, thereby minimizing errors in the response solution. To overcome the inaccuracies due to truncation, Mode Truncation Augmentation was used …
Experimental And Numerical Investigation Of Transesterification Of Vegetable Oil With A Continuous Flow Capillary Reactor, Rachaneewan Charoenwat
Experimental And Numerical Investigation Of Transesterification Of Vegetable Oil With A Continuous Flow Capillary Reactor, Rachaneewan Charoenwat
Mechanical and Aerospace Engineering Dissertations - Archive
Biodiesel, Fatty Acid Methyl Ester (FAME), is a renewable fuel that is a promising alternative to fossil fuels in the future. Biodiesel not only has similar properties to diesel derived from fossil fuel, but it also provides more environmentally friendly due to lower carbon monoxide and sulfur emissions. Biodiesel is composed of methyl esters which can be synthesized from various fatty acid sources with a present of catalyst. Typical feed-stocks include vegetable oils, such as waste cooking oil, animal fats, and even oil from algae. Four primary ways to use vegetable oil as a fuel are direct use, blending with …
Modeling And Control Of Automatic Transmission With Planetary Gears For Shift Quality, Patinya Samanuhut
Modeling And Control Of Automatic Transmission With Planetary Gears For Shift Quality, Patinya Samanuhut
Mechanical and Aerospace Engineering Dissertations - Archive
Automatic transmission is a major component in a vehicle that transmits the power source from the engine to the drive wheels of the vehicle. To improve fuel economy, reduce emission and enhance driving performance, many researchers have made tremendous efforts on new technologies for automatic transmission with planetary gear sets. Among these new technologies, system dynamics and control methodologies are extremely important tools to realizing the fuel economy, emission and driving performance. This research effort focuses on the modeling and control of an automatic transmission with planetary gear sets. A Lagrange-based method is developed to derive the equations of motion …
Buckling Analysis Of Thin Plates With Or Without A Hole Under Arbitrary Boundary Conditions Using The Galerkin Method, Srider Thirupachoor Comerica
Buckling Analysis Of Thin Plates With Or Without A Hole Under Arbitrary Boundary Conditions Using The Galerkin Method, Srider Thirupachoor Comerica
Mechanical and Aerospace Engineering Theses - Archive
This thesis demonstrates how to find the critical buckling load value of thin plates with or without a hole under different boundary conditions using the Galerkin method. The use of symbolic software is essential due to the lengthy computations involved because of the complexity of the problems. Firstly, the lateral deflection of the plate is expressed in a series of polynomials each of which satisfies the given boundary conditions. Then by using the Galerkin method, the coefficients of these polynomials are found and with the help of symbolic algebra system, the matrices for the corresponding eigenvalue problem are built from …
A One Dimensional Dry Friction Microconveyor Platform: Modelling And Analysis Of Micropart Motion Due To Surface Excitation, Moshin Rizwan
A One Dimensional Dry Friction Microconveyor Platform: Modelling And Analysis Of Micropart Motion Due To Surface Excitation, Moshin Rizwan
Mechanical and Aerospace Engineering Dissertations - Archive
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 limitations on the lower bound on the size of the micropart to be handled. In this research, the active surface concept for non-contact micropart manipulation is investigated. The active surface deformation is generated by a set of controlled microactuators and provides for continuous micromanipulation while alleviating limitations of existing approaches. The drastic increase of surface area to volume ratio from macroscale to microscale requires the consideration of surface forces (such …
High Speed Edgewise Rotor Computational Analysis And Optimization At High Inflow Velocities Achieved Through Forward Mast Tilt, Cory Michael Hitte
High Speed Edgewise Rotor Computational Analysis And Optimization At High Inflow Velocities Achieved Through Forward Mast Tilt, Cory Michael Hitte
Mechanical and Aerospace Engineering Theses - Archive
Increased forward flight speed has long been the desire of the rotorcraft industry. Novel designs, such as compounds and tilt rotors have allowed for speed envelope expansion, but not without incurring performance hindrances unique to each configuration. Designs that utilize low disc loading edgewise rotors, which offer efficient flight at high speeds while maintaining hover performance, are desirable. Such designs require increased flapping capability and/or mast tilt in order to achieve the necessary thrust orientation required for overcoming aircraft drag. The combination of speed and thrust vector inclination yields a relatively undocumented region of rotorcraft performance. In particular, the effects …
The Analysis And Testing Of The Quaife Torque-Biasing Differential, John W.H. Trout
The Analysis And Testing Of The Quaife Torque-Biasing Differential, John W.H. Trout
Mechanical and Aerospace Engineering Theses - Archive
The purpose of this thesis is to analyze and test the Quaife torque biasing differential. The differential was modeled mathematically and equations were formulated. Experiments were then performed on a Formula SAE car to see how the output torque of each axle would react to modified preload torques. The results of these tests were then compared with the mathematical models. Overall, it was found that the there are two equations that govern the differential: one for traction and one for slip, and that the derived model correlates well with the experimental results.
Parametric And Performance Analysis Of A Hybrid Pulse Detonation / Turbofan Engine, Sivarai Amith Kumar
Parametric And Performance Analysis Of A Hybrid Pulse Detonation / Turbofan Engine, Sivarai Amith Kumar
Mechanical and Aerospace Engineering Theses - Archive
The performance of a hybrid pulse detonation engine (PDE), with the PDE tubes installed in the bypass duct of a turbofan engine is investigated in this study. Performance parameters for the duct burning PDE engine are compared with a baseline turbofan engine. The PDE analysis is based on an updated numerical analysis by Endo-Fujiwara, whereas the turbofan calculations are based on Mattingly's gas turbine model. The calculations were done with MATLAB 2010 as a platform. A mixer analysis was performed for the hybrid engine concept. In the duct burning PDE, the PDE exhaust was mixed with the turbine exhaust prior …
Analytical Parametric Cycle Analysis Of Continuous Rotating Detonation Ejector-Augmented Rocket Engine, Huan V. Cao
Analytical Parametric Cycle Analysis Of Continuous Rotating Detonation Ejector-Augmented Rocket Engine, Huan V. Cao
Mechanical and Aerospace Engineering Theses - Archive
An analytical parametric cycle analysis model for the continuous rotating detonation wave ejector-augmented rocket was developed to estimate and evaluate the maximum potential performance that the continuous rotating detonation wave rocket (CRDWR) itself can provide in an ejector ramjet as well as the two-stage rocket for low earth orbit (LEO). This was done by integrating Bykovskii's model for CRDWR with Heiser & Pratt's modified ejector ramjet and their transatmospheric performance model. The performance results of this unique engine in comparison to a regular rocket counterpart were evaluated primarily in terms of specific thrust and specific impulse with respect to flight …
Issues On Finite Element Modeling Of Laminated Composite Structures, Farhan Alamgir
Issues On Finite Element Modeling Of Laminated Composite Structures, Farhan Alamgir
Mechanical and Aerospace Engineering Theses - Archive
Composite structures have been used widely in aviation industries and civil construction field because of their high specific stiffness, high specific strength and directional dependent properties. When using finite element method to analyze these structures, special attention of modeling is required. This thesis addresses the effect of layer stresses and displacements of a laminate under loading due to element meshing, boundary constraints and material properties used in modeling of composite structures. This study also includes the investigation of the magnitude and location of the layer peak stresses on modeling the laminate with a hole. It is concluded that special characteristics …
Development Of Ultra-High Temperature Material Characterization Capabilities Using Digital Image Correlation Analysis, Julia Elaine Cline
Development Of Ultra-High Temperature Material Characterization Capabilities Using Digital Image Correlation Analysis, Julia Elaine Cline
Mechanical and Aerospace Engineering Theses - Archive
Ultra-high temperature deformation measurements are required to characterize the thermo-mechanical response of material systems for thermal protection systems for aerospace applications. The use of conventional surface-contacting strain measurement techniques is not practical in elevated temperature conditions. Technological advancements in digital imaging provide impetus to measure full-field displacement and determine strain fields with sub-pixel accuracy by image processing. In this work, an Instron electromechanical axial testing machine with a custom-designed high temperature gripping mechanism is used to apply quasi-static tensile loads to graphite specimens heated to 2000°F (1093?C). Specimen heating via Joule effect is achieved and maintained with a custom-designed temperature …
Plate Analysis With Different Geometries And Arbitrary Boundary Conditions, Ashwin Balasubramanian
Plate Analysis With Different Geometries And Arbitrary Boundary Conditions, Ashwin Balasubramanian
Mechanical and Aerospace Engineering Theses - Archive
This thesis work deals with the study of plates with various geometries and different boundary conditions. The method of study is carried out mainly using the Galerkin method combined with the help of the symbolic algebraic software, Mathematica. In this thesis, flat plates with rectangular and triangular geometries are subjected to uniform load acting normal to their surfaces. The lateral deflection of the plates is expressed in a series of polynomials which satisfy the homogenous boundary conditions. Mathematica is used in handling the algebraic operations to solve for the coefficients and generating the trial functions. The maximum deflection of the …
Consideration Of Compressibility Effects For Applied-Back-Pressure Dynamic Well Control Response To A Gas Kick In Managed Pressure Drilling Operations, William Alexander Bacon
Consideration Of Compressibility Effects For Applied-Back-Pressure Dynamic Well Control Response To A Gas Kick In Managed Pressure Drilling Operations, William Alexander Bacon
Mechanical and Aerospace Engineering Theses - Archive
Managed Pressure Drilling (MPD) operations offer the ability to control a relatively small gas kick dynamically, without shutting in the well using blowout preventers. One currently employed method of dynamic well control uses applied-back-pressure to force flow exiting the wellbore to equal flow entering the drill-pipe, which is taken as an indication that the influx has stopped. However, for flow out equals flow in to imply influx cessation, the assumption of incompressibility of fluid in the wellbore is necessary. When fluid compressibility is appreciable, solely ensuring flow rate continuity does not necessarily imply influx cessation. The period of "dynamic well …
Numerical Analysis Of The Interaction Between A Detonation Wave And Compressible Homogeneous Isotropic Turbulence, Monika Chauhan
Numerical Analysis Of The Interaction Between A Detonation Wave And Compressible Homogeneous Isotropic Turbulence, Monika Chauhan
Mechanical and Aerospace Engineering Theses - Archive
A numerical study was performed to investigate the effect of preshock turbulence on the detonation wave properties. A direct numerical simulation was performed on the chemically reactive Navier-Stokes equations using a Runge-Kutta scheme and a fifth-order WENO spatial discretization. We performed a direct numerical simulation (DNS) which belongs to the domain of Computational Fluid Dynamics (CFD), of the fluid mechanics equations in three dimensions to determine the fine scale evolution. A simple one-step chemical kinetics model was used in the study.The main objective of the research is to examine the behavior of the turbulence when subjected to a strong shock …
Airfoil-Shaped Extension-Twist-Coupled Composite Star-Beams For Rotor Blade Tip Applications, Sthanu Mahadev
Airfoil-Shaped Extension-Twist-Coupled Composite Star-Beams For Rotor Blade Tip Applications, Sthanu Mahadev
Mechanical and Aerospace Engineering Theses - Archive
Rotorcraft blade tips provide the most effective region for aerodynamic control. Rotor blade airloads are proportional to dynamic pressure and as a consequence are typically the highest in the distal blade tip region. Therefore, blade control using aerodynamic forces and moments is most effectively accomplished over the distal region of the blade. Composite materials represent the preferred material option for modern rotor blade design, especially in the field of rotorcraft and wind energy, due to superior strength-to-weight ratio, fatigue resistance and their ability to be easily tailored to incorporate different coupling (bend-twist, extension-twist, etc.) among elastic modes of deformation within …
Design Optimization Using Augmented Lagrangian Particle Swarm Optimization, Chethan Shivappa Thenehalli
Design Optimization Using Augmented Lagrangian Particle Swarm Optimization, Chethan Shivappa Thenehalli
Mechanical and Aerospace Engineering Theses - Archive
Engineering optimization problems normally include multiple, non-trivial, non-linear constraints. Traditionally gradient based optimization methods were used to solve these types of problems because of their high computational efficiency. But they generally require continuity of the optimization problem and the computation of derivatives and tend to get trapped in local minima. Hence non gradient based, evolutionary algorithms (EA) which are based on heuristic and stochastic nature and do not require continuity of the design space of the optimization problem and increase the probability to find a global optimal solution, therefore are becoming a popular choice in recent years. This work uses …
Stress Analysis For A Three Phase Plate With A Concentric Circular Inclusion By Deriving An Airy Stress Function, Abhishek Kunchala
Stress Analysis For A Three Phase Plate With A Concentric Circular Inclusion By Deriving An Airy Stress Function, Abhishek Kunchala
Mechanical and Aerospace Engineering Theses - Archive
This thesis derives the Airy stress function for a three phase plate that consists of two concentric circular inclusions and a matrix phase. It incorporates the elastic property of each phase as well as the geometry of the inclusions. An Airy stress function has been derived that satisfies the continuity conditions of the displacement and traction across the phase interface precisely. The obtained results are new and could not have been possible without a computer algebra system (Mathematica).
Finite Element Based Stability Constrained Weight Minimization Of Sandwich Composite Ducts For Airship Applications, Urmi B. Khode
Finite Element Based Stability Constrained Weight Minimization Of Sandwich Composite Ducts For Airship Applications, Urmi B. Khode
Mechanical and Aerospace Engineering Theses - Archive
High Altitude Long Endurance (HALE) airships are platform of interest due to their persistent observation and persistent communication capabilities. A novel HALE airship design configuration incorporates a composite sandwich propulsive hull duct between the front and the back of the hull for significant drag reduction via blown wake effects. The sandwich composite shell duct is subjected to hull pressure on its outer walls and flow suction on its inner walls which result in in-plane wall compressive stress, which may cause duct buckling. An approach based upon finite element stability analysis combined with a ply layup and foam thickness determination weight …
Preliminary Design Of Mesoscale Turbocompressor And Rotordynamics Tests Of Rotor Bearing System, Md Saddam Hossain
Preliminary Design Of Mesoscale Turbocompressor And Rotordynamics Tests Of Rotor Bearing System, Md Saddam Hossain
Mechanical and Aerospace Engineering Theses - Archive
A mesoscale turbocompressor spinning above 500,000 RPM is evolutionary technology for micro turbochargers, turbo blowers, turbo compressors, micro-gas turbines, auxiliary power units, etc for automotive, aerospace, and fuel cell industries. Objectives of this work are:1) to evaluate different air foil bearings designed for the intended applications, and 2) to design & perform CFD analysis of a micro-compressor. CFD analysis of shrouded 3-D micro compressor was conducted using Ansys Bladegen as blade generation tool, ICEM CFD as mesh generation tool, and CFS as main solver for different design and off design cases and also for different number of blades. Comprehensive experimental …
Adaptation Of Digital Datcom Into A Conceptual Design Process, Brandon Watters
Adaptation Of Digital Datcom Into A Conceptual Design Process, Brandon Watters
Mechanical and Aerospace Engineering Theses - Archive
As implied with open-ended `design decision-making' there are multiple prospective conventional and unconventional aircraft solution concepts able to satisfy a given mission specification. The task of defining, assessing and selecting prospective options for the mission at hand is the primary purpose of the aircraft conceptual design (CD) phase. In addition, conceptual design tends to be fast paced and an iterative process structure that requires a quick design-response. This leads the aircraft designer to simplified analysis techniques that focus on the impact (trends and sensitivities) of a new technology on the design. Correctly predicting these trends and sensitivities can be difficult. …
Vehicle Suspension Optimization For Stochastic Inputs, Kailas Vijay Inamdar
Vehicle Suspension Optimization For Stochastic Inputs, Kailas Vijay Inamdar
Mechanical and Aerospace Engineering Theses - Archive
In the present thesis, a simulation based numerical method has been proposed for optimization of vehicle suspension system for stochastic inputs from random road surface profiles. Road surfaces are classified in based upon the power spectral density functions. The road surface is considered as a stationary stochastic process in time domain assuming constant vehicle speed. Using Fourier transforms, it is possible to generate the road surface elevations as a function of time. Time domain responses of the output of the suspension system are obtained using transfer function techniques. Optimum values of the damper constant are computed by simulation of the …