rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Rotordynamics Analysis with a Hirth and Curvic Coupling: 3D Solid Finite Element and Efficient Beam Model
  name:
    name part: Kim, Baik Jin
    role:
      role term: creator
    role:
      role term: author.
  name:
    name part: Palazzolo, Alan
    role:
      role term: thesis advisor.
  name:
    name part: Texas A&M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2023
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: Gas turbines and other machinery rotating assemblies are frequently manufactured as multiple components rather than as a single device due to cost and precision requirements. Butt joints, Hirth couplings, and Curvic couplings are widely used to connect the various components. Hirth couplings transmit high torques in the rotating assemblies of compressors and turbines. Curvic couplings are commonly utilized in aircraft engines and large gas turbines for high load capacity and precision centering of stacked components. Both Hirth and Curvic couplings have non-axisymmetric, complex mating contact surfaces, but a curved tooth profile only exists on a Curvic coupling. These complex-shaped contact surface profiles allow the couplings to transmit torque, moment, and force. However, the surface contacts in these couplings introduce non-beamlike behavior such as local lateral flexibility that affects natural frequencies, critical speeds, mode shapes, imbalance response, and vibration stability, making a conventional beam model inadequate. 3D solid finite elements and a GW contact model are presented to explain local deformations at couplings. The proposed approach is benchmarked against experimental measurements of free-free natural frequencies of a test rotor with Hirth and Curvic couplings. The rotor is instrumented with strain gauges for preload force measurements. The Hirth and Curvic couplings⁰́₉ contact surface roughness is measured with a stylus-type surface profiler. Measured surface roughness is used for obtaining the GW parameters. An iterative computation algorithm is developed and utilized to calculate contact stiffness and contact pressure at complex-shaped contact surfaces. This new approach shows improved predictions compared to existing methods. The proposed approach is applied to an industrial rotor to illustrate the effects of the couplings on natural frequencies as well as critical speeds. An equivalent beam modeling method is developed to incorporate thre…
  note: by Baik Jin Kim.
  note: "Major Subject: Mechanical Engineering"
  note: Includes vita.
  note: Doctor of Philosophy Texas A&M University 2022 https://hdl.handle.net/1969.1/198063
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major Mechanical Engineering
  subject:
    topic: Finite element methods
  subject:
    topic: Structural dynamics
  subject:
    topic: GW contact model
  subject:
    topic: Vibration
  subject:
    topic: Solid Mechanics
  subject:
    topic: Stress analysis
  subject:
    topic: Modal analysis
  subject:
    topic: Rotordynamics
  subject:
    topic: Hirth coupling
  subject:
    topic: Curvic coupling
  subject:
    topic: Butt joint
  subject:
    topic: Timoshenko beam
  subject:
    topic: Equivalent Young⁰́₉s modulus
  subject:
    topic: Shear form factor
  subject:
    topic: Equivalent transverse shear effect
  identifier: https://hdl.handle.net/1969.1/198063
  record info:
    record content source: TXA
    record creation date: 240828
    record change date: 20240829173514.8
    record identifier: in00005468573
    language of cataloging:
      language term: eng