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: Applications of Lamb waves for material characterization
    sub title: a laser based study
  title info:
    title: Laser based study
  name:
    name part: Schumacher, Neal Andrew
    name part: 1966-
    role:
      role term: creator
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: xx
    date issued: 1996
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xviii, 202 leaves : illustrations ; 28 cm.
  abstract: The research described involves implementing digital signal
  abstract: processing techniques to calculate phase velocities from
  abstract: transient, multi-mode Lamb waves. A laser based non
  abstract: destructive testing system is used to generate and
  abstract: subsequently record transient waves in homogenous and
  abstract: composite plates. Digital Finite Impulse Response (FIR)
  abstract: filters are shown to be effective tools for isolating
  abstract: individual Lamb modes from the multi-mode waveform time
  abstract: histories. Phase information from Fast Fourier Transforms
  abstract: (FFTS) is used to calculate the isolated Lamb modes' phase
  abstract: velocities. For an appropriate FIR bandpass filter, it is
  abstract: shown that time domain windowing variations had a minimal
  abstract: effect on the calculated phase and hence phase velocity. A
  abstract: non-linear error minimization technique is developed from the
  abstract: governing transcendental Lamb equations to estimate the
  abstract: thickness of homogeneous plates from the phase velocity data.
  abstract: The processing procedures and algorithms are shown to work
  abstract: effectively on both thin and thick plates. Analysis is
  abstract: presented for Copper plates ranging in thickness from 100 gm
  abstract: to 2.4 mm. The laser based system is also used to generate
  abstract: and detect transient Lamb waves in a unidirectional composite
  abstract: plate. Phase velocities of the zeroth order, antisymmetric
  abstract: Lamb modes are found for three directions'of propagation
  abstract: within the composite plate. The results are found to be in
  abstract: good agreement with an exact theory for Lamb waves
  abstract: propagating in an equivalent homogeneous, anisotropic
  abstract: material.
  note: by Neal Andrew Schumacher.
  note: Vita.
  note: "Major Subject: Mechanical Engineering".
  note: "May, 1996".
  note: Issued also on microfiche from University Microfilms Inc.
  note: Includes bibliographical references: pages 168-175.
  note: Ph. D. Texas A&M University 1996.
  subject:
    topic: Major mechanical engineering
  identifier: 96-34837 UMI
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  record info:
    record content source: TXA
    record creation date: 970514
    record change date: 20190325093302.0
    record identifier: in00001355372