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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.


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Patent
17 Aug 2011
TL;DR: In this paper, a damping composition for a vibrational damping layer is provided, including about 5 to about 40 weight percent butyl rubber and about 4 to about 12 weight percent ethylene copolymer.
Abstract: A damping composition for a vibrational damping layer is provided, including about 5 to about 40 weight percent butyl rubber and about 4 to about 12 weight percent ethylene copolymer. In one embodiment, the damping composition can include about 10 to about 30 weight percent butyl rubber, about 4 to about 12 weight percent ethylene vinyl acetate about 10 to about 40 weight percent filler, about 5 to about 15 weight percent plasticizer, about 2 to about 30 weight percent tackifier, and about 1 to about 10 weight percent adhesion promoter. A damping system is also provided, including a base blank, a constraining layer, and a damping layer, wherein the damping layer comprises from about 5 to about 40 weight percent of a butyl rubber, and is in contact with and positioned in between the base blank and the constraining layer.

3 citations

Journal ArticleDOI
TL;DR: In this article, a coupled finite element model for actively controlled constrained layer damped (CLD) rotating plate with self-sensing technique and frequency-dependent material property in both the time and frequency domain analyses is proposed.
Abstract: This work proposes a coupled finite element model for actively controlled constrained layer damped (CLD) rotating plate with self-sensing technique and frequency-dependent material property in both the time and frequency domain analyses. Constrained layer damping with viscoelastic material can effectively reduce the vibration in rotating structures. However, most existing research models use complex modulus approach to model the viscoelastic material, but it limits to frequency domain analysis and the frequency dependency of the viscoelastic material is not well-included as well. It is meaningful use of the anelastic displacement fields (ADFs) that is done in order to include the frequency dependency of the material for both the time and frequency domains. Also, unlike previous ones, all types of damping are taken into account by this finite element model. Thus, in this work, a single layer finite element is adopted to model a three-layer active constrained layer damped rotating plate in which the constraining layer is made of piezoelectric material to work as both the self-sensing sensor and actuator. This newly proposed finite element model is validated, and then, as shown in numerical studies, this proposed approach can achieve effective vibration reduction in both the frequency and time domains.

3 citations

Proceedings ArticleDOI
27 Apr 2000
TL;DR: In this article, a preliminary analytical model has been developed for a slotted stand-off layer damping treatment applied to a beam, based on Euler-Bernoulli beam theory, and may be able to provide an analytical solution of the frequency response for a beam treated with SLAM.
Abstract: Passive stand-off layer and slotted stand-off layer damping treatments are presently being implemented in many commercial and defense designs. In a passive stand-off layer damping treatment, a stand-off or spacer layer is added to a conventional passive constrained layer damping treatment. Additionally, this stand-off layer can be slotted in order to reduce the bending rigidity and total mass of the damping treatment. A preliminary analytical model has being developed for a slotted stand-off layer damping treatment applied to a beam. This mathematical model is based on Euler-Bernoulli beam theory, and may be able to provide an analytical solution of the frequency response for a beam treated with slotted stand- off layer damping.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

3 citations

01 Jan 2016
TL;DR: In this article, the effects of constrained layer damping patches on the sound insulation of aircraft panels are investigated by comparing the sound transmission loss measured and calculated in the environment of a sound impedance tube.
Abstract: The constrained layer damping (CLD) is a typical material which is extensively applied to suppress vibration and noise in aircraft engineering. In order to quickly predict the effects of CLD patches on the sound insulation of aircraft panels, the CLD parameters, such as the mass distribution of each layer, the damping loss factor and the thickness of the constrained layer, on the sound insulation performance of a small uniform panel are investigated by comparing the sound transmission loss measured and calculated in the environment of a sound impedance tube. Then, the study of a real aircraft panel with CLD patches attached is carried out to verify the effectiveness of the prediction method. Hence, the relationship between the CLD parameters and the sound transmission loss of the composite panel measured in the sound impedance tube can be applied to predict the sound insulation performance of the aircraft panels.

3 citations


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