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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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Journal ArticleDOI
TL;DR: In this paper , the authors used shape memory polymers such as polyurethane, silicone, and butyl rubbers as damping materials for symmetrical and unsymmetrical configurations with damping layer thicknesses of 10 mm.
Book ChapterDOI
TL;DR: In this article , a zig-zag 1-3 viscoelastic composite (VEC) layer is designed for improved passive damping treatment of the vibrating structural beam.
Abstract: AbstractA zig-zag 1–3 viscoelastic composite (VEC) layer is designed for improved passive damping treatment of the vibrating structural beam. A zig-zag 1–3 VEC comprises by incorporating graphite blocks in zig-zag manner within the conventional viscoelastic material (VEM) layer. For the estimation of its damping capacity in the passive damping treatment of a beam, the corresponding finite element (FE) model is formed. To investigate the effect of inclusions in their zig-zag form compared to regular form, primarily, the optimal dimensional properties of corresponding configurations are obtained for the maximum damping of the beam. Then, their optimal modal loss factors and the performance in controlling the forced vibration of beam are compared. The results reveal that VEC with a zig-zag form of inclusions improves damping significantly compared to their regular form and conventional VEM. Moreover, this enhancement in damping appears due to the improvement in both extensional and shear counterparts of modal loss factor.KeywordsViscoelastic materialsVibration controlFinite element methodPassive damping treatment
Proceedings ArticleDOI
15 Apr 1996
TL;DR: In this paper, graphite epoxy filament wound composite tubes were fabricated both with and without an imbedded layer of rubber, dynamically tested, and analyzed to investigate their damping characteristics.
Abstract: Graphite epoxy filament wound composite tubes were fabricated both with and without an imbedded layer of rubber, dynamically tested, and analyzed to investigate their damping characteristics. The filament winding process used IM-6 graphite fibers with an anhydride resin system, wet winding over an aluminum mandrel, and an oven cure in a rotisserie. Four different configurations were manufactured: a control configuration, one with an added layer of rubber, one using a modified resin system, and one with both an added layer of rubber and a modified resin system. Two independent modal tests were conducted. The data indicated that the mode shapes as well as the frequencies changed with the addition of a layer of rubber. The constrained layer damping with rubber dramatically increased the modal damping coefficients. Mode shapes from an FEM analysis of the undamped tube were correlated with the measured mode shapes. About half of the first thirteen computed mode shapes correlated with measured mode shapes. (Author)
Journal ArticleDOI
TL;DR: In this paper, a spectral finite element method for a cylindriacl shell with a passive constrained layer damping treatment is presented, where a thin shell theory based on the Donnell-Mushtari-Vlasov assumption is employed.
Abstract: This paper presents a spectral finite element method for a cylindriacl shell with a passive constrained layer damping treatment. A thin shell theory based on Donnell-Mushtari-Vlasov assumption is employed. The equation of spectral unit and the method of determination of natural frequency and modal loss factor are presented.
01 Jan 2004
TL;DR: In this article, a generic analytical formulation that can describe these hybrid couplings in an accurate and consistent way was developed, which considers a partial layerwise theory, with an arbitrary number of layers, both viscoelastic and piezoelectric, attached to both surfaces of the beam.
Abstract: This paper concerns arbitrary active constrained layer damping (ACLD) treatments applied to beams. In order to suppress vibration, hybrid active-passive treatments composed of piezoelectric and viscoelastic layers are mounted on the substrate beam structure. These treatments combine the high capacity of passive viscoelastic materials to dissipate vibrational energy at high frequencies with the active capacity of piezoelectric materials at low frequencies. The aim of this research is the development of a generic analytical formulation that can describe these hybrid couplings in an accurate and consistent way. The analytical formulation considers a partial layerwise theory, with an arbitrary number of layers, both viscoelastic and piezoelectric, attached to both surfaces of the beam. A fully coupled electro-mechanical theory for modelling the piezoelectric layers is considered. The equations of motion, electric charge equilibrium and boundary conditions are presented. A one-dimensional finite element (FE) model is developed, with the nodal degrees of freedom being the axial and transverse displacements and the rotation of the centreline of the host beam, the rotations of the individual layers and the electric potentials of each piezoelectric layer. The damping behavior of the viscoelastic layers is modeled by the complex modulus approach. Three frequency response functions were measured experimentally and evaluated numerically: acceleration per unit force, acceleration per unit voltage into the piezoelectric actuator and induced voltage per unit force. The numerical results are presented and compared with experimental results to validate the FE model.

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