Design And Construction Of A Tunable Light Source With Light Emitting Diodes For Photosynthetic Organisms,
2012
Utah State University
Design And Construction Of A Tunable Light Source With Light Emitting Diodes For Photosynthetic Organisms, Nathan Phillipps
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This thesis describes and documents the design and construction of a light source which is tunable and has the ability to mimic the spectral output of the sun in the photosynthetic active radiation range (400 - 700 nm). To adjust the spectral output at different wavelengths different types of LEDs were chosen and combined. This thesis describes the design, construction, testing, and suggestions for further improvements to this light source. The light source is comprised of 900 LEDs with 26 different peak wavelengths within the photosynthetically active radiation range. The light source is made tunable through the use of a …
Micro-Grid Wind Energy System,
2012
California Polytechnic State University - San Luis Obispo
Micro-Grid Wind Energy System, Aaron Steinkraus, Brian Huntziker, Cesar Hurtado
Mechanical Engineering
With the completion of a 3.5kW wind turbine located on Esculea Ranch, the power generated from the turbine was dissipated through electric resistance heaters. ABC Wind was given the task to design, build, and implement a system what will efficiently use the turbine’s harnessed power. After interviewing with the Beef Operations Manager of Escuela Ranch, it was decided to use the turbine’s power to supply supplementary water to anywhere on the ranch where and when needed by grazing cattle. The purpose of this project was to research, design, build and implement a system that would harness the generated power and …
Energy Trapping Of Thickness-Shear And Thickness-Twist Modes In A Partially Electroded At-Cut Quartz Resonator,
2012
University of Nebraska-Lincoln
Energy Trapping Of Thickness-Shear And Thickness-Twist Modes In A Partially Electroded At-Cut Quartz Resonator, Huijing He, Guoquan Nie, Jinxi Liu, Jiashi Yang
Department of Mechanical and Materials Engineering: Faculty Publications
The thickness-shear and thickness-twist vibrations of a finite and partially electroded AT-cut quartz resonator are investigated. The equations of anisotropic elasticity are used with the omission of the small elastic constant c56 . An analytical solution is obtained using Fourier series from which the free vibration resonant frequencies, mode shapes, and energy trapping are calculated and examined.
Solar Turbines Creep Test Fixture,
2012
California Polytechnic State University - San Luis Obispo
Solar Turbines Creep Test Fixture, Rene Maciel, Eric Nelson, Chris Ewald
Mechanical Engineering
No abstract provided.
Integrating Qplm And Biomedical Test Data With An Anisotropic Fiber Distribution Model And Predictions Of Tgf-Β1 And Igf-1 Regulation Of Articular Cartilage Fiber Modulus,
2012
California Polytechnic State University - San Luis Obispo
Integrating Qplm And Biomedical Test Data With An Anisotropic Fiber Distribution Model And Predictions Of Tgf-Β1 And Igf-1 Regulation Of Articular Cartilage Fiber Modulus, Michael E. Stender, Christopher B. Raub, Kevin A. Yamauchi, Reza Shirazi, Pasquale Vena, Robert L. Sah, Scott J. Hazelwood, Stephen M. Klisch
Mechanical Engineering
A continuum mixture model with distinct collagen (COL) and glycosaminoglycan elastic constituents was developed for the solid matrix of immature bovine articular cartilage. A continuous COL fiber volume fraction distribution function and a true COL fiber elastic modulus ( Ef) were used. Quantitative polarized light microscopy (qPLM) methods were developed to account for the relatively high cell density of immature articular cartilage and used with a novel algorithm that constructs a 3D distribution function from 2D qPLM data. For specimens untreated and cultured in vitro, most model parameters were specified from qPLM analysis and biochemical assay results; consequently, Ef was …
Implementation Of Magnetic Resonance Elastography For The Investigation Of Traumatic Brain Injuries,
2012
University of Nebraska-Lincoln
Implementation Of Magnetic Resonance Elastography For The Investigation Of Traumatic Brain Injuries, Thomas Boulet
Department of Engineering Mechanics: Dissertations, Theses, and Student Research
Magnetic resonance elastography (MRE) is a potentially transformative imaging modality allowing local and non-invasive measurement of biological tissue mechanical properties. It uses a specific phase contrast MR pulse sequence to measure induced vibratory motion in soft material, from which material properties can be estimated. Compared to other imaging techniques, MRE is able to detect tissue pathology at early stages by quantifying the changes in tissue stiffness associated with diseases. In an effort to develop the technique and improve its capabilities, two inversion algorithms were written to evaluate viscoelastic properties from the measured displacements fields. The first one was based on …
Sustainability For Die Manufacturing: Comparative Study Of Wedm And Milling,
2012
University of Nebraska-Lincoln
Sustainability For Die Manufacturing: Comparative Study Of Wedm And Milling, Matthew S. Kalus
Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research
Sustainability is more important in today's culture due to the increasing demand for a more eco-friendly society. Concentrations in minimizing and reducing environmental impacts, energy and natural resources have been forthcoming in industry. The tool, mold and die industries are the most well known industries that machine harder materials using mills and WEDM. The objective of this thesis was to compare the sustainability differences in both of these machines utilizing the accepted standards for evaluating the manufacturing process performance for sustainability. These standards include the evaluation of the process parameters, raw materials, power, tools and fluids which all contribute to …
A Study Of Hdpe In High Pressure Of Hydrogen Gas: Measurement Of Permeation Parameters And Fracture Criteria,
2012
University of Nebraska-Lincoln
A Study Of Hdpe In High Pressure Of Hydrogen Gas: Measurement Of Permeation Parameters And Fracture Criteria, Sompong Prachumchon
Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research
The permeation parameters of hydrogen gas in high density polyethylene (HDPE) system are sought by comparison with a diffusion model. The method of Green’s functions is used to obtain solutions for the diffusion model. Permeation parameters are found from transient experimented data during two processes; pressurization followed by depressurization. The mechanical compression of HDPE during the pressurization process resulted in lower diffusivity coefficient values and higher solubility values. The results show that the diffusivity coefficient value in the pressurization process is 37% of that during the depressurization process. At the start of the depressurization process, a short-duration fast flow rate …
Building Envelope Wind Pressure Manipulation For Application In Streamlined High-Rise Buildings,
2012
Syracuse University
Building Envelope Wind Pressure Manipulation For Application In Streamlined High-Rise Buildings, Sivaramprasad Sivakumar
Mechanical and Aerospace Engineering - Dissertations
This research investigates methods of manipulating building envelope wind pressure distribution for application in the natural ventilation of high-rise buildings. CFD simulations are employed to predict the wind pressure distribution around the building envelope. First, a 2-D CFD study is conducted to explore various techniques of manipulating the building envelope wind pressure distribution. This study indicates that the use of externally mounted flow-resistance devices is an effective method of manipulating the wind pressure distribution. It is demonstrated that this technique is well suited for application to buildings of streamlined cross-section (e.g. elliptical planform). Next, a 3-D CFD study is conducted …
Development Of Feature Recognition Algorithm For Automated Identification Of Duplicate Geometries In Cad Models,
2012
Clemson University
Development Of Feature Recognition Algorithm For Automated Identification Of Duplicate Geometries In Cad Models, Aravind Shanthakumar
All Theses
This research presents a feature recognition algorithm for the automated identification of duplicate geometries in the CAD assembly. The duplicate geometry is one of the seven indicators of the lazy parts mass reduction method. The lazy parts method is a light weight engineering method that is used for analyzing parts with the mass reduction potential. The duplicate geometry is defined as any geometries lying equal to or within the threshold distance with the user-defined orientation between them and have the percentage similarity that is equal to or greater than the threshold value. The feature recognition system developed in this research …
Design Automation And Optimization Of Honeycomb Structures For Maximum Sound Transmission Loss,
2012
Clemson University
Design Automation And Optimization Of Honeycomb Structures For Maximum Sound Transmission Loss, Rohan Galgalikar
All Theses
Cellular materials with macro effective properties defined by repeated meso-structures are increasingly replacing conventional homogeneous materials due to their high strength to weight ratio, and controllable effective mechanical properties, such as negative Poisson's ratio and tailored orthotropic elastic properties. Honeycomb structures are a well-known cellular material that has been used extensively in aerospace and other industries where the premium on the weight reduction with high-strength is required. Common applications of honeycomb cellular structures are their use as the core material in sandwich plates and plates between two face sheets. Honeycomb structures are built from repetition of a common hexagonal unit …
Alternative Energy Sources - Integration Of Power Generation Systems Into A Microgrid At Clemson University And An Atmospheric Thermodynamic Driven Mechanical Clock,
2012
Clemson University
Alternative Energy Sources - Integration Of Power Generation Systems Into A Microgrid At Clemson University And An Atmospheric Thermodynamic Driven Mechanical Clock, Shreyas Patel
All Theses
Non-renewable energy sources such as coal, crude oil, and natural gas are being consumed at a brisk pace which is promoting a worldwide energy crisis. The burning of fossil fuels produces greenhouse gases such as carbon dioxide and nitrous oxides as well as soot which contribute to atmospheric pollution. Although fossil fuels will continue to be available for many decades, the amount of petroleum remaining in the earth and its associated cost remains an open issue. The utilization of green energy such as solar and wind offer renewable and pollution free sources. A worldwide shift is slowly underway towards the …
Standardization Of Process Sheet Information To Support Automated Translation Of Assembly Instructions And Product-Process Coupling,
2012
Clemson University
Standardization Of Process Sheet Information To Support Automated Translation Of Assembly Instructions And Product-Process Coupling, Matthew Peterson
All Theses
The design and manufacture of large scale systems, particularly automobiles, is a process that requires collaboration across multiple disciplines. This collaboration is facilitated through efficient and effective data and knowledge storage and transfer. Specifically, the data associated with the final assembly of the vehicle should be generated, organized, and distributed in such a manner that each user of the data is able to use it effectively. Furthermore, the structure for the assembly data should be robust and reliable such that it fosters consistency among various planners for multiple vehicle platforms that are assembled all around the world. This research aims …
Development Of A Two-Dimensional Model Of A Pneumatic Tire,
2012
Clemson University
Development Of A Two-Dimensional Model Of A Pneumatic Tire, Timothy Lewis
All Theses
The pneumatic tire has been studied extensively since its invention in 1888. With the advent of high-powered computers and the use of the finite element method, the understanding of the tire's complex non-linear behavior has grown tremendously. However, one weakness of finite element models is that parameter studies are difficult and time consuming to perform. In contrast, an analytical model can quickly and easily perform extensive parameter studies. To the knowledge of the author, all existing analytical models of the tire make assumptions concerning the tire's behavior and construction that while useful for obtaining some of the first-order characteristics, are …
Composite Sandwich Structures With Honeycomb Core Subjected To Impact,
2012
Clemson University
Composite Sandwich Structures With Honeycomb Core Subjected To Impact, Lei He
All Theses
Composite sandwich structures constructed with honeycomb core can be an effective means of absorbing impact in many engineer applications. Conventional hexagonal honeycomb exhibit an effective positive Poisson's ratio, are commonly employed due to their lightweight and high axial stiffness properties. In contrast, auxetic honeycombs offer high in-plane shear stiffness, and exhibit negative Poisson's ratios with lateral extension, instead of contraction, when stretched axially.
In this study, the dynamic response of an aluminum composite panel with a honeycomb core constrained within two thin face sheets is investigated undergoing impact with a rigid ball. The finite element models used to simulate impact …
Concept Generation Using Morphological And Options Matrices,
2012
Clemson University
Concept Generation Using Morphological And Options Matrices, Dani George
All Theses
The use of morphological matrices as a tool to aid concept generation is examined. Two limitations of the method are highlighted; (1) the large number of potential combinatorial possibilities and (2) the lack of design details in the system concepts generated. An Integrated Idea Generation (IIG) method is proposed to support the generation of detailed system concepts effectively without performing a full factorial combination of the means within a morphological matrix. Pairwise functional combinations are extracted from the functions listed in the morphological matrix and explored in detail using options matrices and innovation challenges, encouraging designers to identify implicit assumptions …
Study Of Cell Viability During Laser Direct Writing Of Cell-Alginate Suspension,
2012
Clemson University
Study Of Cell Viability During Laser Direct Writing Of Cell-Alginate Suspension, Hemanth Gudapati
All Theses
Laser-assisted cell printing, developed based on Matrix-assisted pulsed-laser evaporation direct-write (MAPLE DW), a typical LIFT (laser-induced forward transfer) practice, has been emerging as one of the most promising biofabrication techniques. Alginate, particularly sodium alginate, is extensively used as the constituent of bioink in laser-assisted cell printing. However, thus far, studies investigating the effect of alginate gelation on cell viability in laser-assisted cell printing are lacking. The objective of this study is to investigate the effects of gelation, gelation time, sodium alginate concentration, and the effect of operating conditions such as the laser fluence on post-transfer cell viability during laser-assisted cell …
Rotor Model Updating And Validation For An Active Magnetic Bearing Based High-Speed Machining Spindle,
2012
NASA Glenn Research Center
Rotor Model Updating And Validation For An Active Magnetic Bearing Based High-Speed Machining Spindle, Adam C. Wroblewski, Jerzy T. Sawicki, Alexander H. Pesch
Mechanical Engineering Faculty Publications
This paper presents an experimentally driven model updating approach to address the dynamic inaccuracy of the nominal finite element (FE) rotor model of a machining spindle supported on active magnetic bearings. Modeling error is minimized through the application of a numerical optimization algorithm to adjust appropriately selected FE model parameters. Minimizing the error of both resonance and antiresonance frequencies simultaneously accounts for rotor natural frequencies as well as for their mode shapes. Antiresonance frequencies, which are shown to heavily influence the model’s dynamic properties, are commonly disregarded in structural modeling. Evaluation of the updated rotor model is performed through comparison …
Handitrike - Recumbent Tricycle,
2012
California Polytechnic State University - San Luis Obispo
Handitrike - Recumbent Tricycle, Sean Higginson, Kevin Howie, Vinay Patel
Mechanical Engineering
This report covers the design and construction of the recumbent racing tricycle for Mr. Robert T. Kelly, a disabled veteran. Unfortunately Rob’s right leg is five inches shorter than his left one and therefore is unable to properly operate standard cranks. Our team HandiTrike is composed of Sean Higginson, Kevin Howie, and Vinay Patel and our project requires us to come up with a design that is feasible to complete within the given three quarters, as well as allow Rob to gain full use of his tricycle. Currently Rob ‘s trike uses the standard crank set up found on most …
Formula Sae Turbocharger Engine Development,
2012
California Polytechnic State University - San Luis Obispo
Formula Sae Turbocharger Engine Development, Eric Griess, Kevin Mccutcheon, Matthew Roberts, William Chan
Mechanical Engineering
This project, Formula SAE Turbocharger System Development, was sponsored by the Cal Poly, San Luis Obispo Formula SAE team. The team proposed this project in order to have a powerful yet lightweight engine so they can be extremely competitive at their competition. The baseline output of the single cylinder 450cc engine (2006 Yamaha WR450F) was 46 horsepower and 27 ft-lb of torque. The goal of this project was to increase the output of that engine to 60 horsepower and 35 ft-lb through the use of a turbocharger.
