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Sunday, February 2, 2020 | History

2 edition of Vibrational analysis of engine components using neural-net processing and electronic holography found in the catalog.

Vibrational analysis of engine components using neural-net processing and electronic holography

Vibrational analysis of engine components using neural-net processing and electronic holography

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  • 27 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C, Springfield, Va .
Written in English

    Subjects:
  • Engine parts.,
  • Neural nets.,
  • Speckle patterns.,
  • Real time operation.,
  • Finite element method.,
  • Vibration.,
  • Diffraction patterns.

  • Edition Notes

    StatementArthur J. Decker ... [et al.].
    SeriesNASA technical memorandum -- 113124.
    ContributionsDecker, Arthur J., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15498510M

    Fontaine Show Abstract We present a 3-D holographic inspection device for laboratory and industrial use. L Rubtsova Show Abstract The influence of the third-order nonlinearity of a medium containing a steady-state holographic grating on the grating properties is nvestigated theoretically. Part of the Springer Series in Optical Sciences book series SSOS, volume 31 Abstract The knowledge of the particular role in sound formation of the different parts of the human vocal organ and of other parts of the body are of interest for medical applications as well as for prediction of the vocal timbre of students studying voice. This important distinction is responsible for two key phenomena. Google Scholar Buckberry, C.

    Although my function as a chairman of the regional European program committee was combined with some additional work, it was always a pleasure for me to contribute to an effort to bring us "holographers" together in a country most of us, who are foreign here, have not yet been before, and in this way spreading the exchange of experience and knowledge to our mutual advantage also in this part of the world. Pulsed laser holographic techniques display considerable potential for use in this way. InLaser Technology, Inc. With this technique the lateral resolution of the profilometer will not be affected by the limitations on optical aperture.

    Lasers interlocked to test cell doors or vacuum attachment features are an important design feature. In practice, shearography has been demonstrated to be a highly effective testing technique for spray on foam insulation. Point sources[ edit ] Sinusoidal zone plate If the recording medium is illuminated with a point source and a normally incident plane wave, the resulting pattern is a sinusoidal zone platewhich acts as a negative Fresnel lens whose focal length is equal to the separation of the point source and the recording plane. Thus, it is paramount that effective means be developed that can detect ,or better yet, predict the onset of a fatigue crack. The second reference beam illuminates the recording medium directly.


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Vibrational analysis of engine components using neural-net processing and electronic holography Download PDF Ebook

Here, sonic frequency sound is used to excite the foam material. Author s : P Saari; R Kaarli; A Rebane Show Abstract In this paper, the concept of holographic storage and reproduction of optical signals is generalized for the case of a spectrally highly selective recording medium, which in addition to fixing the spatial intensity distribution of the incident light is also able to memorize its intensity spectrum.

Thus, the recorded light pattern is a holographic recording as defined above. Author s : Ding Zuquan; Bao Naikeng Show Abstract A method of HFR combined with double exposure holography, sandwich holography and strobo scope holography respectively, and its applications of the quantitative analysis of 3-D displacement of human skull; of the change of dentomaxilla and vibration of violin are presented in this paper.

Vibrational analysis of engine components using neural-net processing and electronic holography book is a preview of subscription content, log in to check access. This allows the scene to be viewed from a range of different angles, as if it were still present.

It is shown that this interferometer has some advantages over the conventional Point Diffraction Interferometer PDI such as easy alignment and adjustable visibility. Author s : Wei-feng Chen; Xiang-yang Huang; Xuan-tong Ying; Yu-run Jia Show Abstract A new coding method for a CGH with pure phase based on the decomposition of any complex vector into two symmetrically situated conponent vectors with equal amplitude is proposed.

Google Scholar Goodman, J. Google Scholar Vrooman, H. This interferometer can also be used in a reflection mode to test non-dielectric deposits made on opaque substrates. Both holography and shearography have been implemented in important aerospace programs, providing cost effective, high speed discontinuity detection.

Shen; X. The description of the process of computational reconstruction of time-averaged holographic fringes and discussion on various problems when beam performs chaotic oscillations is given in Section 5. In practice, shearography has been demonstrated to be a highly effective testing technique for spray on foam insulation.

Author s : Gert von Bally Show Abstract It was a great honour for me to assist in preparing this International Conference on Holographic Applications for that part of the world where the idea of holography was created by Dennis Gabor in the fourties - that is Europe. This process is experimental and the keywords may be updated as the learning algorithm improves.

References 1. The defects within the tyre are found automatically and are listed on an outprint. Shearography, on the other hand, is sensitive only to the deformation derivatives and tends to show only the local deformation on the target surface due to the presence of a surface or subsurface discontinuity.

Google Scholar Hariharan, P. The fundamental principle of the method is discribed in detail and the experimental results are given followed by the discussion of the features of this method. In this sense I wish - not only the organizers of this conference - but all of us success.

Author s : C. The object in the hologram is a toy van.

Holographic and Shearographic NDT Application in Aerospace Manufacturing

The use of solar algae ponds and tanks to warm and purify water for fish and attached macroscopic marine algae culture is an ancient and effective technique, but limited seasonally and geographically by the availability of sunlight.

The recording medium is located where this light, after being reflected or scattered by the subject, will strike it. Secondary aircraft structures have long used composite materials.

On this basis, a new method of measuring surface roughness is suggested, and computer simulation experiment is conducted. Conclusions are given in Section 7. Author s : G. With this technique the lateral resolution of the profilometer will not be affected by the limitations on optical aperture.

Holographic Vibration Analysis of the Frontal Part of the Human Neck During Singing

A photograph clearly maps out the light field of the original scene.Apr 25,  · Playing with amplitude, phase and frequency of both reference and signal arms, heterodyne holography is well adapted to vibration analysis.

Vibration sidebands can be imaged and stroboscopic measurement sensitive to mechanical phase can be made. Mar 19,  · Glenn researchers are using and improving a technique called electronic holography, which replaced the old photographic method of time-averaged holography in rapid identification of a structure's vibrational modes.

Electronic holography is a three-dimensional digital imaging method that produces large, interactive, color holographs that exhibit. Holographic interferometry (HI) is a technique which enables static and dynamic displacements of objects with optically rough surfaces to be measured to optical interferometric precision (i.e.

to fractions of a wavelength of light). These measurements can be applied to stress, strain and vibration analysis, as well as to non-destructive testing and radiation dosimetry.TV-holography is a well-known tool for vibration pdf.

Using the so-called time-average method, this technique allows to record interferograms showing the mode shapes of a structure submitted to vibration excitation and is currently used for modal tjarrodbonta.com by: Time average holography in vibration analysis Ryszard J.

Pryputniewicz Worcester Polytechnic Institute Department of Mechanical Engineering Center for Holographic Studies and Laser Technology Worcester, Massachusetts Abstract. This paper deals with the quantitative interpretation of time-average holograms of vibrating objects.Holography Applications.

Editor(s): Jingtang Ke; Ryszard J. Pryputniewicz *This item is ebook available on the SPIE Digital Library. Volume Details. Volume Number: Date Published: 15 January Table of Contents show all abstracts | hide all abstracts. Applications Of Holography