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Eric E. Ungar
Researcher at BBN Technologies
Publications - 39
Citations - 1078
Eric E. Ungar is an academic researcher from BBN Technologies. The author has contributed to research in topics: Noise & Viscoelasticity. The author has an hindex of 14, co-authored 39 publications receiving 1038 citations.
Papers
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Journal ArticleDOI
Loss Factors of Viscoelastic Systems in Terms of Energy Concepts
Eric E. Ungar,Edward M. Kerwin +1 more
TL;DR: In this article, the authors re-examined the definition of loss factor in terms of energy quantities, particularly as it applies to composite viscoelastic systems, and proposed simple relations which express the loss factors of series-parallel arrays of massless VRSs.
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The status of engineering knowledge concerning the damping of built-up structures
TL;DR: In this article, the effects of structural joints on the damping of built-up structures are discussed, and the energy dissipation mechanisms associated with squeezing, rocking, and shearing motions are discussed for simple joints that are dry, lubricated, or provided with viscoelastic inserts.
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Loss Factors of Viscoelastically Damped Beam Structures
TL;DR: In this article, general expressions for the loss factors of axially uniform linear composite structures in terms of properties of the constituents are derived, applicable to practical composites incorporating free and constrained viscoelastic components.
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Vibrations and noise due to piston-slap in reciprocating machinery
Eric E. Ungar,Donald Ross +1 more
TL;DR: In this paper, the dynamics of lateral piston motions across the cylinder clearance spaces of reciprocating machines are analyzed and the results of this analysis are then applied to derive estimates for the noise and vibration produced by piston-slap impacts.
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High-frequency vibration isolation
Eric E. Ungar,C.W. Dietrich +1 more
TL;DR: In this paper, the authors present generalized expressions for transmissibility and isolation effectiveness, which are applicable to isolation of one point of a linear system and which take into account isolator mass effects as well as vibration source and receiver characteristics.