Results 211 to 220 of about 246,253 (259)

Improvement of damping performance by splitting damping material

Microsystem Technologies, 2011
Damping materials in the carriage arm of a hard disk drive reduce flow-induced vibrations. As recording tracks become narrower, better damping is required. In this paper, a technique of splitting damping materials to improve the damping performance is described.
Hajime Eguchi, Hiromitsu Masuda, Eiji Soga   +2 more
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Damping material, damping arrangement and method for designing a damping arrangement

The Journal of the Acoustical Society of America, 2008
A laminate material for damping a vibrational mode of a structure is provided, the laminate material comprising a viscoelastic layer and a stiff constrained layer adhered to the viscoelastic layer, wherein the viscoelastic layer is elastomer based and the constrained layer is made of steel, galvanized steel or aluminum.
openaire   +1 more source

Vibration damping apparatus for windows using viscoelastic damping materials

The Journal of the Acoustical Society of America, 2010
An improved vibration damping system is provided for use with window structures. The window damping system employs both air-film damping technology and viscoelastic damping materials to increase mechanical and/or acoustic vibration damping in window structures.
Thomas M. Lewis, Michael L. Parin
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ELASTOTHERMODYNAMIC DAMPING IN COMPOSITE MATERIALS

Mechanics of Advanced Materials and Structures, 1994
Abstract When a composite material is subjected to a stress field (homogeneous or inhomogeneous), different phases undergo different temperature fluctuations due to the well-known thermoelastic effect. As a result irreversible heat conduction occurs within each phase and between phases, and entropy is produced; this entropy is the genesis of ...
Joseph E. Bishop, Vikram K. Kinra
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Poromechanical Damping of Cementitious Materials

Journal of Materials in Civil Engineering, 2012
Other than through the creation of fracture surfaces, cementitious materials do not generally contribute significantly to strain energy dissipation or damping during dynamic loading of civil infrastructure. In this paper, the potential to increase damping of cementitious materials through utilization of poromechanical effects is evaluated.
Chin K. Leung, Zachary C. Grasley
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Vibration Damping Materials

1991
The dynamic resonances and sound barrier properties of a structure are governed primarily by mass, stiffness, and damping. Mass and stiffness were discussed in Chapter 3. Damping is perhaps the most unpredictable and complex property. The word “damping” has been used loosely for many years to denote any number of noise abatement procedures.
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Damping Efficiency of Ribbed Panels with Different Damping Materials

SAE Technical Paper Series, 1997
<div class="htmlview paragraph">Geometrical stiffening of the panels via rib design are considered due to vehicle design requirement and vibro-acoustic considerations. This paper studies the damping effectiveness of different damping treatments (extensional, shear damping structural damping layer - based on friction and inelastic collision) for ...
Yang Qian, Anuj Aggarwal, Hameed Khan
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Material damping under random excitation

Journal of Sound and Vibration, 1976
The damping capacity of three materials subjected to narrow-band strain fluctuations is investigated, the material effectively undergoing sinusoidal strain with randomly varying amplitude. For this case, a theoretical relationship is established between the expected value of the energy dissipated per unit volume of the material per period of the narrow-
D.J. Mead, A.K. Mallik
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Damping capacity of layered materials

Journal of Applied Physics, 1994
Extensive measurements of the internal friction in a variety of layered materials such as graphite, metal dichalcogenides (MoS2, TiS2, NbSe2, TaS2, TaSe2, and TaTe2), and montmorillonite clays are reported. The internal friction of these layered materials exhibits features similar to those observed in graphite.
E. D. Brandner, Alain Munier, Jian-Ming Zhu, Bruce A. Averill, Bellave S. Shivaram   +4 more
openaire   +1 more source

Material damping of cantilever beams

Journal of Sound and Vibration, 1982
Abstract In this paper, a method for estimating material damping in a cantilever beam is reported. This method shows that the damping can be calculated in terms of the stress distribution functions for each mode of vibration and the damping-stress function.
Y. Kume, F. Hashimoto, S. Maeda
openaire   +1 more source