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Constrained-layer damping

About: Constrained-layer damping is a research topic. Over the lifetime, 795 publications have been published within this topic receiving 15758 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, the constrained layer damping (CLD) configuration, also known as viscoelastically damped sandwich structure, is considered, and the material-parameter extraction procedure is presented, and mathematical models are reviewed.

42 citations

Proceedings ArticleDOI
01 May 1994
TL;DR: In this article, the authors presented a finite element model for a sandwich beam consisting of a host layer, a viscoelastic layer, and a piezoelectric layer.
Abstract: Constrained layer damping has been used for many years to increase the damping in engineering structures. Several researchers have suggested the concept of using viscoelastic materials with piezoceramics as the constraining layer. Since the piezoceramics are active materials, this concept can be referred to as active constrained layer damping. The paper presents a finite element model for a sandwich beam consisting of a host layer, a viscoelastic layer, and a piezoelectric layer. Lesieutre's method (Augmenting Thermodynamic Fields) for modeling damping was modified and applied to active constrained layer damping. Previous work on active constrained layer material has used the loss factor approach to modeling the viscoelastic layer. Such approaches are limited to steady state considerations, while the approach taken here is suitable for transient disturbances. Active damping and passive damping are individually of interest, however, here we propose to combine these two types of damping to produce an active constrained layer system with the best of both technologies.© (1994) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

42 citations

Journal ArticleDOI
TL;DR: In this article, the performance of piezoelectric fiber reinforced composite (PFRC) material in the development of new actuators as elements of smart structures has been theoretically investigated.
Abstract: The effectiveness of piezoelectric fiber reinforced composite (PFRC) material in the development of new actuators as elements of smart structures has been theoretically investigated. The piezoelectric fibers considered in this study are longitudinally oriented to yield the bending mode of actuation. Micromechanics is used to predict the effective mechanical properties and the effective electromechanical constant of such composites which gives rise to actuation in the fiber direction when subjected to an electric field transverse to the fiber direction. These effective properties are useful for the analysis of smart beams. A micromechanics study reveals that beyond a critical fiber volume fraction, this electromechanical constant is improved over that of the piezoelectric material alone. The performance of this new material used as distributed actuators has been investigated through active constrained layer damping (ACLD) of laminated composite beams in which the constraining layer is made of piezoelectric fiber reinforced composite. A finite element model has been developed to describe the dynamic behavior of a laminated composite beam coupled with active constrained layer damping (ACLD) treatment. The controlled response is illustrated through plots of frequency response functions. The results indicate that these new piezoelectric composites may be superior candidate materials for use in developing lightweight smart structures, as compared with the existing piezoelectric materials alone.

41 citations

Journal ArticleDOI
TL;DR: In this article, a constrained layer damping toolholder was developed to increase the axial depth of cut and stable spindle speed for end milling operation, which is influenced by dynamic stiffness and natural frequency of the milling tool holder.

41 citations

Patent
14 Dec 2001
TL;DR: In this article, a type of passive magnetic bearing that provides both positive radial stiffness and significant levels of passive radial damping is described, which can also be generated with minor modifications to the basic configuration.
Abstract: A type of passive magnetic bearing that provides for both positive radial stiffness and significant levels of passive radial damping. Axial damping and axial forces can also be generated with minor modifications to the basic configuration. The bearing is comprised of a series of magnet, damping, and rigid non-magnetic elements essentially defining a laminated or composite structure. The damping material (33) is directly mounted between the magnets and a rigid material, resulting in constrained layer damping. The range of motion of these floating, or soft mounted, magnets (32) may also be restricted to generate higher stiffness in response to large vibrations.

41 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202310
202227
202123
202020
201927
201826