Book ChapterDOI
Design of Zig-Zag 1–3 Viscoelastic Composite Layer for the Improved Passive Damping Treatment of Beam
TLDR
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 read more
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Journal ArticleDOI
Damping of Flexural Waves by a Constrained Viscoelastic Layer
TL;DR: In this article, a quantitative analysis of the damping effectiveness of a constrained layer of damping tape is presented, where the loss factor η is defined as the normalized imaginary part of the complex bending stiffness of the damped plate.
Journal ArticleDOI
Passive vibration damping enhancement using carbon nanotube-epoxy reinforced composites
Himanshu Rajoria,Nader Jalili +1 more
TL;DR: In this article, the stiffness and damping properties of carbon nanotube-epoxy composites are examined for use in structural vibration applications, and it is observed that enhancement in damping ratio is more dominant than enhancement in stiffness by using carbon Nanotube reinforcement.
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Review and assessment of various theories for modeling sandwich composites
TL;DR: In this article, an attempt has been made to analyze and assess the various kinematics and theories used for the modeling of sandwich composites and a unified kinematic formulation is then proposed.
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Length Optimization for Constrained Viscoelastic Layer Damping
R. Plunkett,C. T. Lee +1 more
TL;DR: In this article, a method for increasing this damping by cutting the constraining layer into appropriate lengths is discussed, based on effective complex elastic moduli of an equivalent homogeneous medium.
Journal ArticleDOI
Damping analysis of partially covered sandwich beams
TL;DR: In this paper, two methods for damping analysis of a partially covered sandwich beam were developed based on simplified methods and one based on an exact method, respectively, for the Euler beam theory for the uncovered portion of the beam, and for the covered portion, with continuity conditions at the common sections, have been used.