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Sunday, February 2, 2020 | History

1 edition of Constrained viscoelastic layer damping of thick aluminum plates found in the catalog.

Constrained viscoelastic layer damping of thick aluminum plates

Michael John Bateman

Constrained viscoelastic layer damping of thick aluminum plates

design, analysis and testing

by Michael John Bateman

  • 100 Want to read
  • 23 Currently reading

Published by Naval Postgraduate School, Available from National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English

    Subjects:
  • DAMPING,
  • NOISE REDUCTION

  • About the Edition

    Modern naval warfare has been increasingly dependent upon the acoustic silencing of the participants. Constrained viscoelastic layer damping of vibrating elements is one method which can be used to meet acoustic silencing goals. This paper considers constrained viscoelastic layer damping treatments applied to a thick aluminum plate, including single layer, double layer, a milled pocket plate, and a milled "floating element" configuration. High modal damping values were obtained for each damping configuration. The Modal Strain Energy method, using finite element analysis to estimate modal loss factors, was investigated for use as a tool in constrained viscoelastic layer damping design. A comparison of experimentally measured frequency response and modal loss factors with those predicted by the modal stain energy method is presented to confirm the possible use of the modal strain energy method as a design tool. Keywords: Vibration, Damping, Viscoelastic material, Constrained layer damping. (JS)

    Edition Notes

    Other titlesNPS-69-90-5.
    Statementby Michael J. Bateman, K. Steven Kim, Young S. Shin
    ContributionsKim, K. Steven, Shin, Y. S., Naval Postgraduate School (U.S.). Dept. of Mechanical Engineering
    The Physical Object
    Paginationxi, 125 p. :
    Number of Pages125
    ID Numbers
    Open LibraryOL25517087M

    Although the basic structure shown in FIG. When the term viscoelastic is used in the text it should be construed to encompass this special case. The behavior of the centrifuge system can be modeled by established analytical procedures. The examples of FIG. Narayanan and A. In summary, it is possible for the designer to combine multiple layers of CWC laminates, viscoelastic materials, and conventional materials in any number of configurations according to the design criteria of the engineer.

    The plate 2 of FIG. The basic design contemplated by Cabales, et. Sharma and B. Pratt, W.

    Yen Such materials and structures made from wavy composites have enhanced structural properties and represent a greatly enhanced method of manufacturing crossply laminates. It has a textured-paint finish, attractive white-oak endcaps, and input and output resistances of 3 and ohms, respectively. The fixture was a conical plate. That's called "thru transmission. Claims: 1.


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Constrained viscoelastic layer damping of thick aluminum plates book

There is still great opportunity. Though it lacked the full-bodied sound of the more expensive Lyra Anna, the Aventurin was fast, clean, and natural, with a well-extended treble, solid bass, and rich midrange, said MF.

The successful damping engineer must know more than damping. Figure 1 shows a two arm optical fiber interferometer that is sensitive to optical path length differences of less than a wavelength of light. Current production uses a heavier gauge of wire on coil with fewer windings. Neumann wanted make sure his maintenance people fixed aircraft engines right Composite materials have been used to construct a wide variety of structural elements, including tubes, enclosures, beams, plates and irregular shapes.

He was a very cultured man history. Two bright-blue tubular LEDs run vertically through the metal body's horizontal slats, giving the cartridge a unique look.

Structurally amplified acoustic and vibration energy exacerbates the problem due to low inherent damping in fairings and other structural components. Better dynamic test techniques are needed; a greater range of materials properties should be measured and catalogued: and extensions to analytical methods would really expand the range of applications.

The effect of outgassing moisture desorption on the damping was determined by measuring the damping ratio of a tube specimen in a vacuum environment before and after outgassing had occurred. However, strict alignment requirements for the instrument preclude the use of low-frequency isolation, unless active methods are used.

In the following, this value will be always implicitely expressed as a percentage. Although the basic structure shown in FIG. Ericsson and B. Subhash and C. Deming's philosophy is that 85 percent of quality problems are caused by the system; just 15 percent are caused by people.

Structural damping of model sandwich structures using tailored shear thickening fluid compositions.

Modern Practice in Stress and Vibration Analysis

Neither reference taught or cited any method of constructing or using wavy or chevron patterned composites as replacements for unidirectional pre-preg based wavy crossply laminates. The audio acquisition equipment used can be summed up as follows: Table 3 Microphone characteristics.

Of course any of the material combinations discussed in conjunction with FIGS.Though similar in appearance to the RPMs, the Spiral Groove uses a five-layer chassis—two thin layers of damping material separated by three aluminum plates—and a thick, anti-vibration platter comprising layers of aluminum, an impregnated phenolic, vinyl, and graphite.

System equivalent damping loss factor for a 1 mm thick, line-driven and partially-constrained aluminum panel treated either by a bonded poro-elastic layer (red solid line) or a limp porous layer (green dashed line).

(For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)Cited by: 1.

The present study investigates the vibration and sound radiation by panels exited by turbulent flow and by random noise. Composite and aluminum panels are analyzed through a developed analytical framework. The main objective of this study is to identify the difference between the vibroacoustic behaviour of these two types of panels.

What I claim as my invention is:

This topic is of particular importance, given the growing Cited by: 3. This book concerns the development of novel finite elements for the structural analysis of composite beams and blades. The introduction of material damping is also an important aspect of composite structures and it is presented here in terms of their static and dynamic behavior.

[25] V.S. Rao, C.T. Sun, J.M.

US20020028332A1

Bai and B.V. Sankar () "Finite Element Analysis of Prestressed Laminated Plates with Constrained Viscoelastic Damping Layer" DOE Facilities Programs, Systems Interaction, and Active/Inactive Damping, PVP-Vol.editor: Chi-Wen Lin, American Society of Mechanical Engineers, New York, NY, pp.

CONFERENCE PROCEEDINGS Papers Presentations Journals. Advanced Photonics Journal of Applied Remote Sensing.