Recent applications of viscoelastic damping for noise control in automobiles and commercial airplanes
TL;DR: In this paper, the application of passive damping technology using viscoelastic materials to control noise and vibration in vehicles and commercial airplanes is described, and the material presented in this paper will be useful for instruction and further research in developing new and innovative applications in other industries.
About: This article is published in Journal of Sound and Vibration.The article was published on 2003-05-01. It has received 570 citations till now. The article focuses on the topics: Noise control.
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TL;DR: In this article, a review of the available literature on damping in composite materials is presented, where a chronological review of test methods for damping estimation is presented in order to describe the time-line of theoretical knowledge development in this field.
Abstract: The present review aims at gathering the available literature on damping in composite materials. A chronological review of test methods for damping estimation is presented in order to describe the time-line of the theoretical knowledge development in this field. In the last years many new material configurations have emerged that deserve investigation, such as nano-composites, hybrid laminates and sandwich materials. Damping models specifically meant for non-homogeneous materials are reported to provide a background for understanding this problem. Although not widely exploited yet, fibre reinforced polymers has the potential to be tailored for damping by acting on constituents, geometry and boundary conditions. Nano-composites, for instance, are shown to possess a high potential for damping purposes. New hybrid and sandwich-type structures are emerging as noise and vibration control solutions in lightweight applications. The effort devoted to mathematical and numerical model in view of Finite Element integration of damping properties is also addressed. Finally, the conclusions summarise the ideas of the authors on needed steps to advance the state-of-the-art in each of the described topic.
240 citations
TL;DR: A comprehensive review of the various research methods and theory calculation models that are employed in engineering to study the static and dynamic vibration characteristics of viscoelastic damping material (VDM) formed structures is presented in this article.
204 citations
TL;DR: A review of vibration control techniques and their application for marine offshore structures is presented in this article, where the general trend is progressing towards semi-active and hybrid vibration control from passive or active control, as they provide more practical approaches for implementation.
143 citations
TL;DR: A systematic literature review of different piezoelectric shunt damping strategies developed for the attenuation of vibration and noise in mechanical systems, including an assessment of the basic principles underlying the electromechanical behavior.
126 citations
TL;DR: In this article, a spectral finite element method is developed and used to calculate the dispersion properties of the first few wave types of a given laminate; the proposed approach provides a robust and numerically efficient alternative to the transfer matrix method in certain applications.
Abstract: This analysis is concerned with wave propagation and damping in linear viscoelastic laminates. A spectral finite-element method is developed and used to calculate the dispersion properties of the first few wave types of a given laminate; the proposed approach provides a robust and numerically efficient alternative to the transfer matrix method in certain applications. The proposed approach is also well suited to the calculation of the wave types of sections whose material properties vary continuously throughout the thickness of the section. A one-dimensional finite-element mesh is used to describe the through-thickness deformation of the laminate, and the dispersion equation for plane-wave propagation is formulated as a linear algebraic eigenvalue problem in wave number at each frequency of interest. The resulting eigenvectors and eigenvalues can be computed using standard numerical routines and used to investigate the dispersion characteristics of the propagating wave types of the section. The damping lo...
122 citations
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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.
Abstract: For a number of years it has been known that flexural vibrations in a plate can be damped by the application of a layer of damping (viscoelastic) material that is in turn constrained by a backing layer or foil. A common example is the damping tape currently used in aircraft.This paper presents a quantitative analysis of the damping effectiveness of such a constrained layer. As in the work of H. Oberst the damping is characterized by the loss factor η, which is the normalized imaginary part of the complex bending stiffness of the damped plate.The calculated damping factor depends on the wavelength of bending waves in the damped plate, and on the thicknesses and elastic moduli of the plate, the damping layer, and the constraining layer. A complex shear modulus is assigned to the damping layer, where all of the energy dissipation is assumed to take place.Damping factors have been determined experimentally on laboratory test bars for a number of constrained‐damping‐layer applications for frequencies from abou...
693 citations
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11 Feb 1999
TL;DR: In this paper, the authors describe the response of structures to non-Harmonic motions and non-harmonic forces, and the control of Vibration by localized additions and added damping.
Abstract: The Response of Structures to Harmonic Forces. Receptance and Dynamic Stiffness. The Response of Structures to Prescribed Harmonic Motions. The Response of Structures to Non-Harmonic Excitation. Factors Controlling Beam and Plate Vibration. The Control of Vibration by Structural Design. The Control of Vibration by Localized Additions. The Control of Vibration by Added Damping. The Control of Vibration by Resilient Isolation. The Control of Vibration by Combined Methods. Index.
377 citations
TL;DR: In this paper, a discussion of various mathematical models which have been proposed to represent the damping behavior of solid materials, with emphasis on their usefulness in structural dynamic analyses is presented, along with derivations of interrelationships which exist among them.
245 citations