Dynamic studies on plates with unconstrained layer treatment
TL;DR: In this paper, a plate is subjected to a harmonic excitation at one of the resonating frequencies and the magnitude of the amplitude of vibration and the dynamic stresses developed in the plate will depend mainly on the damping ratio.
About: This article is published in Computers & Structures.The article was published on 1993-11-01. It has received 7 citations till now. The article focuses on the topics: Thermoelastic damping & Damping ratio.
Citations
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TL;DR: In this article, the modal loss factors obtained by topology optimization to the ones obtained by other approaches, in order to determine which approach provides a better damping treatment, were compared.
69 citations
TL;DR: In this paper, a parametric study is performed to explore the effect that the design parameters, namely the thickness/length ratio, constraining layer thickness, material modulus, natural mode and boundary conditions have on these two counterparts and subsequently, on the treatment efficiency.
29 citations
29 Jul 2004
TL;DR: In this paper, the optimal shape of a constrained viscoelastic layer on an elastic beam used for vibration damping was determined by means of topology optimization and experimentally verified.
Abstract: Of the many methods available for achieving effective vibration damping, adding viscoelastic lamina constrained by a stiff elastic materials is an inexpensive, space efficient means for achieving significant damping levels. Recently, the desire to apportion this material in a way that will take the greatest advantage of its dissipative characteristics has led to studies in optimization 1-7 . The aim of this research is to determine the optimal shape of a constrained viscoelastic layer on an elastic beam used for vibration damping by means of topology optimization and to experimentally verify these results. The optimization objective is to maximize the system loss factor for the first resonance frequency of the base beam. All previous optimal design studies on viscoelastic lamina have been size or shape optimization studies assuming a certain topology for the damping treatment (with the exception of Lumsdaine 8 and Lumsdaine and Pai 9 , of which this work is an extension). In this study, this assumption is relaxed, allowing an optimal topology to emerge. The loss factor is computed using the Modified Modal Strain Energy Method 10 in the optimization process. It is observed that a novel topology emerges from the optimized result. From this computational result, a topology is interpreted that can be reasonably manufactured, and this topology is custom fabricated to experimentally validate the computational result. The experimental results show that significant improvement in damping performance, over 300%, is obtained by optimizing the constrained damping layer topology.
9 citations
TL;DR: In this paper, the authors examined an acoustic-structure interaction problem for non-proportional damped systems and derived coupled responses for a structure and acoustic enclosure using a modified modal coupling formulation.
3 citations
01 Apr 2020
TL;DR: Solid isotropic material with penalization topology optimization method is applied to determine the optimum material layout for within a given volume constraint on a front door of a typical vehicle to improve door closing sound quality and other metrics.
Abstract: Door closing sound quality of a vehicle has become one of the most important customer-related quality metrics in the recent years. There has been a vast amount of information on the design paramete...
3 citations
Cites methods from "Dynamic studies on plates with unco..."
...In the earlier studies, the placement of damping pads was made manually.(30,31) The other common methods in the literature are based on (i) the mode shape(32) and (ii) the strain energy distribution....
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References
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01 Jan 1989
TL;DR: In this article, the methodes are numeriques and the fonction de forme reference record created on 2005-11-18, modified on 2016-08-08.
Abstract: Keywords: methodes : numeriques ; fonction de forme Reference Record created on 2005-11-18, modified on 2016-08-08
17,327 citations
TL;DR: In this article, the optimum thickness distribution of unconstrained viscoelastic damping layer treatments for plates was investigated. And the results indicated that the system loss factor can be increased by as much as 100%, or more, by optimizing the thickness distribution.
30 citations
TL;DR: In this paper, the effects of partial application on the modal frequencies, loss factors and mode shapes are discussed, and specific recommendations are made for the near-optimum distribution of the damping material on the panel surface which is effective for many modes of panel response.
30 citations