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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

  • 154 Want to read
  • 40 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

    Figure 17 shows a completed honeycomb panel prior to test. The aluminum hat section stiffener panel shown in Figures 18 and 19 consists of aluminum hat sections riveted to the aluminum base plate. A viscoelastic damping layer is bonded directly to the hat, followed by a graphite epoxy constraining layer. A recent addition to SME's series of tonearms, the nominally 9" (effective length: mm) SPD features a magnesium armtube with internal constrained-layer damping, coupled with a removable cast-magnesium headshell that's claimed not to compromise overall arm rigidity; effective mass is .

    A Finite Element Formulation for Composite Laminates with Smart Constrained Layer Damping, Advances in Engineering Temperature and Degree of Cure in Thick Thermosetting Composite M. F., and Hilton, H. H., Dynamic Responses of Plates with Free Layer Viscoelastic Damping Treatment, ASME: Journal of Vibration. 49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 16th AIAA/ASME/AHS Adaptive Structures Conference,10th AIAA Non-Deterministic Approaches Conference, 9th AIAA Gossamer Spacecraft Forum, 4th AIAA Multidisciplinary Design .

    Damping Characteristics of Laminated Thick Plates. T. W. Taylor, A. H. Nayfeh. J. Appl. Mech View article. PDF. Topics: Damping, Plates (structures), Composite materials, Geometry, Vibration, Anisotropy, Strips. Parametric Resonance of a Spinning Disk Under Space-Fixed Pulsating Edge Loads Contact Mechanics of a Thin Layer. Damping Characteristics of Laminated Thick Plates. T. W. Taylor, A. H. Nayfeh. J. Appl. Mech View article. PDF. Topics: Damping, Plates (structures), Composite materials, Geometry, Vibration, Anisotropy, Strips. Parametric Resonance of a Spinning Disk Under Space-Fixed Pulsating Edge Loads An Orthotropic Viscoelastic Winding.


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Constrained viscoelastic layer damping of thick aluminum plates by Michael John Bateman Download PDF EPUB FB2

Vibration and Damping Analysis of Plates with Partially Covered Damping Layers the vibration response of plates partially or fully covered with a constrained viscoelastic damping material.

This paper presents an analysis of the dynamic behaviour of constrained layer damping (CLD) beams with thick viscoelastic layer. A homogenised model for the flexural stiffness is formulated using. The Golla-Hughes-McTavish (GHM) method is used to account for the frequency dependent properties of the viscoelastic core.

Experiments were conducted on symmetric and asymmetric sandwich plates with aluminum face-plates under clamped boundary conditions to validate the model for isotropic lphsbands.com by: 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. Sep 20,  · Constrained Layer Damping Treatments for Microstructures (e.g., beams or plates), a viscoelastic photoresist layer, and an aluminum constraining layer.

Silicon base beams and plates are fabricated from {} wafer through Ethylene-Diamine-Pyrocatechol etch and buffered oxide etch. A μm thick photoresist AZ is spun on the Cited by: 5. The structure studied is an aluminum channel incorporating a constrained layer of highly viscoelastic polymer.

The predictive technique employs a general and systematic method for calculating damping and stiffness matrices using only measured material properties and structure geometry. Single-Degreeof-Freedom Systems with Damping Free Vibrations of Two-Degree -of- Freedom Systems with Viscous Damping Forced Vibrations of Two-Degreeof-Freedom Systems with Damping Transient Vibrations of of vibration damping, properties of viscoelastic damping materials, vibrations of discrete damped systems, and damping of fiber-reinforced.

Used in construction of high rated STC wall assemblies, SoundBreak XP purple drywall consists of a layer of viscoelastic damping polymer sandwiched between two pieces of high density mold resistant gypsum board, providing constrained layer damping.

A method and apparatus of manufacturing a composite material which is light weight and highly damped against vibration. The composite material comprises fibers embedded in a resin matrix wherein the fibers are oriented in a waveform that is substantially continuously variable as to period, amplitude and/or shape.

A viscoelastic material is combined with the resin matrix to provide vibration Cited by: The damping behaviour of multi-layer composite mechanical components, shown by recent research and application papers, is analyzed. A local dissipation mechanism, acting at the interface between any two different layers of the composite component, is taken into account, and a beam model, to be used for validating the known experimental results, is lphsbands.com by: 7.

Sep 11,  · Called constrained or embedded-layer damping, these methods produce modest gains in damping. One of the more common passive damping methods, Constrained Layer Damping or CLD (Kerwin, ), is achieved by bonding a thin layer of metal sheet, usually aluminum, to an existing structure with a viscoelastic adhesive.

Construction and advantages of tubular structures made from wavy composite, conventional composites, and damping materials is revealed.

The use of sinuous or wavy composite structures as a capable replacement for crossply laminates is disclosed. By combining wavy composite laminae in various waveforms, offsets, angular orientations and material combinations, it is possible to provide axial Cited by: Optimization of modal loss factors of active-passive sandwich plates with active elastic constrained damping layers and a viscoelastic core using the thickness and laminate layer orientation angles as design variables was conducted using a LW finite element model in Ref.

The study aimed at determining the location of a prescribed number of Cited by: The present study concerns with dynamic characterization and optimal design of a partially treated magneto-rheological (MR) sandwich plate.

An aluminum sandwich plate, partially treated with MR fluid (MRF DG) was fabricated for dynamic characterization in the laboratory. The MR-filled cavity in the plate was subjected to a uniform magnetic flux using two permanent magnets located at top and Author: Mehdi Eshaghi, Ramin Sedaghati, Subhash Rakheja, Fan Yang.

These Non-Newtonian fluids were used for the manufacturing of sandwich panels in constrained layer damping configuration.

The first part of this work was focused on the analysis of the linear viscoelastic region for these materials, by means of a 2-step rheological lphsbands.com: Cecchini Federico, Cherubini Valeria, Francesco Fabbrocino, Francesca Nanni.

Full text of "DTIC ADA Development of Composite Materials with High Passive Damping Properties" See other formats.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA 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. This topic is of particular importance, given the growing Cited by: 3. Mar 07,  · Called constrained or embedded-layer damping, these methods produce modest gains in damping.

[] One of the more common passive damping methods, Constrained Layer Damping or CLD (Kerwin, ), is achieved by bonding a thin layer of metal sheet, usually aluminum, to an existing structure with a viscoelastic adhesive.

A Finite Element Formulation for Composite Laminates with Smart Constrained Layer Damping, Advances in Engineering Software, Vol. 31 (), pp.Aug. Effects of Thermo-mechanical Properties of Composites on Viscosity, Temperature and Degree of Cure in Thick Thermosetting Composite Laminates during Curing Process, Journal of.

Mar 21,  · Constrained Layer Damping. Improving the MSE method for viscoelastic damped structures. Revised modal strain energy method for finite element analysis of viscoelastic damping treated structures.

Control of vibration and wave propagation .CONFERENCE PROCEEDINGS Papers Presentations Journals. Advanced Photonics Journal of Applied Remote Sensing.Oct 22,  · Modern Practice in Stress and Vibration Analysis documents the proceedings of the conference on Modern Practice in Stress and Vibration Analysis organized by the Stress Analysis Group of the Institute of Physics at the University of Liverpool, April Book Edition: 1.