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Filtering by: Creator Istok, Jonathan D. Remove constraint Creator: Istok, Jonathan D. Academic Affiliation Mechanical, Industrial, and Manufacturing Engineering Remove constraint Academic Affiliation: Mechanical, Industrial, and Manufacturing Engineering Degree Field Mechanical Engineering Remove constraint Degree Field: Mechanical Engineering

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  • Simulation of drag reduction due to multi-aligned spheres

    Creator:
    Lindqvist, Varna
    Abstract:
    A method was sought to predict the flight paths and collisions for closely spaced ink droplets of various sizes as a design aid for ink-jet printing development. Computational fluid dynamics models of two rigid aligned spheres, as a proxy for ink droplets, were initiated in atmospheric pressure air at constant...
    Resource Type:
    Masters Thesis
    Full Text:
    Ellipsoid long axis length (m) Cd Drag coefficient d Sphere diameter (μm) g Gravitational

  • Photonic Sintering of Nanoparticle Inks : Experimental Characterization, Computational Modeling and System Design for Additive Manufacturing

    Creator:
    MacNeill, William D.
    Abstract:
    Photonic sintering of nanoparticles is a relatively new process for sintering of nanoparticles, deposited on a substrate, into functional solid structures. The working principle of this process is the incidence of large-area broad-spectrum light onto deposited nanoparticles, which results in heat generation in the nanoparticles and their subsequent densification. Key...
    Resource Type:
    Masters Thesis
    Full Text:
    OF William D. MacNeill for the degree of Master of Science in Mechanical Engineering presented

  • Dynamics and stability of lateral plane locomotion on variable inclines

    Creator:
    Bonnono, Scott A.
    Abstract:
    An actuated, bipedal model is developed to investigate lateral plane locomotion dynamics and stability on inclines. Both the point mass case and rigid body case are considered. Variations in the force-free leg length are determined via inverse dynamics to explicitly and implicitly match prescribed lateral and fore-aft force profiles, respectively....
    Resource Type:
    Masters Thesis
    Full Text:
    producing point mass particle dynamics, or displaced some vector distance d away from the center of mass

  • Modeling of Non-Spherical Particle Dynamics in a Non-Uniform Flow

    Creator:
    Alshehri, Ahmad S.
    Abstract:
    Turbulent flow with suspended, non-spherical particles can be found in nature and several industrial applications. Although turbulence with dispersed spherical particles has been studied extensively, modeling the dynamics of non-spherical particles in a turbulent flow has not been studied extensively. Motion of spherical particles in complex flows is typically captured...
    Resource Type:
    Masters Thesis
    Full Text:
    master’s thesis committee: Dr. Deborah Pence, Dr. James Liburdy, and Dr. Jonathan Istok. I would like to

  • Practical Application of the Finite Element Method for Vehicle System Loads Analysis

    Creator:
    Weitzman, Paul M.
    Abstract:
    This work develops the loads, boundary conditions, and model construction techniques used to create a high-level vehicle analysis model. The loads are derived from the overall performance parameters of the vehicle, which include 3 axis accelerations and aerodynamic forces from Computational Fluid Dynamics outputs. The boundary condition of the analysis...
    Resource Type:
    Masters Thesis
    Full Text:
    ............................................................................ 79 D MOMENT OF INERTIA APPROXIMATION........................................................ 81 E

  • Experimental study of impulse turbines and permanent magnet alternators for pico-hydropower generation

    Creator:
    Cobb, Bryan R.
    Abstract:
    Increasing access to modern forms of energy in developing countries is a crucial component to eliminating extreme poverty around the world. Pico-hydro schemes (less than 5-kW range) can provide environmentally sustainable electricity and mechanical power to rural communities, generally more cost-effectively than diesel/gasoline generators, wind turbines, or solar photovoltaic systems....
    Resource Type:
    Masters Thesis
    Full Text:
    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 NOMENCLATURE A area d diameter f friction factor g gravitational

  • Study of Energy Harvesting Performance of Oscillating Airfoils using a Discrete Vortex Model

    Creator:
    Kamrani Fard, Kiana
    Abstract:
    The energy harvesting performance of oscillating airfoils is studied using a discrete vortex model (DVM) with a leading-edge separation criterion. The airfoil undergoes a combined sinusoidal heaving and pitching motion at reduced frequencies of k = 0.06 − 0.16, with heaving amplitude of h0 = 0.5c, and pitching amplitude of...
    Resource Type:
    Dissertation
    Full Text:
    . Fronk, and Dr. Istok, for their time, advice, and feedback on my dissertation. I would like to thank

  • From running birds to walking robots : optimization as a unifying framework for dynamic bipedal locomotion

    Creator:
    Hubicki, Christian M.
    Abstract:
    Bipedal locomotion is a complex phenomenon to understand and control, making it difficult for legged robots to achieve the speed, agility, efficiency, and robustness of their animal counterparts. This thesis argues for the use of numerical optimization to investigate and implement bipedal control as it applies to biology, dynamical models,...
    Resource Type:
    Dissertation
    Full Text:
    Dynamic Bipedal Locomotion Abstract approved: Jonathan W. Hurst Bipedal locomotion is a complex

  • ATRIAS 1.0 & 2.1 : enabling agile biped locomotion with a template-driven approach to robot design

    Creator:
    Grimes, Jesse A.
    Abstract:
    Practical bipedal robots need to be simultaneously efficient, robust, and versatile machines, but designing robots dynamically capable of these demands has been a significant bottleneck. We designed ATRIAS to be a highly dynamic biped capable of both walking and running untethered in real environments. To meet these goals, ATRIAS is...
    Resource Type:
    Masters Thesis
    Full Text:
    approved: Jonathan W. Hurst Practical bipedal robots need to be simultaneously e�cient, robust, and

  • Force and impulse control for spring-mass running

    Creator:
    Koepl, Devin N.
    Abstract:
    We present a novel control strategy for running which is robust to disturbances, and makes excellent use of passive dynamics for energy economy. The motivation for our control strategy is based on observations of animals, which are able to economically walk and run over varying terrain and ground dynamics. It...
    Resource Type:
    Masters Thesis
    Full Text:
    Impulse Control for Spring-Mass Running Abstract approved: Jonathan W. Hurst We present a novel control