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Journal ArticleDOI

Partial coverage of rectangular plates by unconstrained layer damping treatments

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.
About: This article is published in Journal of Sound and Vibration.The article was published on 1985-09-22. It has received 30 citations till now.
Citations
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Journal ArticleDOI
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

Journal ArticleDOI
TL;DR: Based on the measured resonance frequencies and frequency response functions (FRFs) of a viscoelastic damping plate, an inverse approach was developed to identify the aforementioned parameters with frequency-dependent characteristic as discussed by the authors.

35 citations

Journal ArticleDOI
Li Cheng1, R. Lapointe1
TL;DR: In this paper, a study on vibration damping by means of partial viscoelastic coating applied to the surface of vibrating panels is presented, where an optimization procedure seeking the location as well as the shape of coverage giving the best damping performance for a given weight of material is established.
Abstract: This paper presents a study on vibration damping by means of partial viscoelastic coating applied to the surface of vibrating panels. An optimization procedure seeking the location as well as the shape of coverage giving the best damping performance for a given weight of material is established. Emphasis is also put on the temperature and frequency dependent characteristics of the viscoelastic material. The results show the effects of the operating temperature and the great potential of using optimized partial coverage, either to reduce the weight while maintaining the same damping level or to increase the performance with the same amount of material.

26 citations

Journal ArticleDOI
TL;DR: In this article, a hard-coating cantilever thin plate under base excitation was taken as the research object, and an inverse method was developed to identify storage modulus and loss factor of hard coating.
Abstract: The mechanical parameters of hard coating, such as storage modulus and loss factor, are affected by preparation technology significantly and have the strain dependent characteristic. So the effective identification of these mechanical parameters becomes a challenge task. In this study, a hard-coating cantilever thin plate under base excitation was taken as the research object, and an inverse method was developed to identify these mechanical parameters. Firstly, the principles of identifying storage modulus and loss factor of hard coating were presented according to the inverse method. Then, from the need of parameters identification, the analytical model and calculation formula of equivalent strain for the hard-coating composite plate were derived. Next, also for parameter identification, the vibration experiments about the cantilever plate coated with NiCoCrAlY

22 citations


Cites background from "Partial coverage of rectangular pla..."

  • ...The distance δ between the interface of coating-substrate and neutral surface can be determined as [20]...

    [...]

Journal ArticleDOI
TL;DR: In this paper, an analytical model of hard-coating composite plate was created by energy method considering the material nonlinearity of hard coating, and a specific calculation procedure was also proposed.
Abstract: Due to the material nonlinearity of hard coating, the coated structure produces the nonlinear dynamical behaviors of variable stiffness and damping, which make the modeling of hard-coating composite structure become a challenging task. In this study, the polynomial was adopted to characterize this material nonlinearity and an analytical modeling method was developed for the hard-coating composite plate. Firstly, to relate the hard-coating material parameters obtained by test and the analytical model, the expression of equivalent strain of composite plate was derived. Then, the analytical model of hard-coating composite plate was created by energy method considering the material nonlinearity of hard coating. Next, using the Newton-Raphson method to solve the vibration response and resonant frequencies of composite plate and a specific calculation procedure was also proposed. Finally, a cantilever plate coated with MgO

20 citations

References
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Journal ArticleDOI
TL;DR: In this article, a complete understanding of the various modes of vibration and the modal damping associated with each mode is required for theoretical evaluation of the response of a structure under random acoustic excitation.

17 citations

Journal ArticleDOI
TL;DR: In this paper, a series of measurements were carried out to examine the effectiveness of vibration damping layers on 2×1 m2 thin metal plates, which were covered with viscoelastic damping.

12 citations

Journal ArticleDOI
TL;DR: Elastic metal thin plates transverse resonant free vibrations, analyzing viscoelastic coatings damping effects as discussed by the authors, were used to analyze the damping effect of thin plate thinning.
Abstract: Elastic metal thin plates transverse resonant free vibrations, analyzing viscoelastic coatings damping effects

10 citations

01 Aug 1964
TL;DR: In this paper, the effect of concentrating the treatment in the regions of highest bending moment in order to use all the material more effectively was investigated, and three methods of analysis were presented, two of them being approximate but relatively rapid in use.
Abstract: : Since unconstrained layer damping treatments on vibrating plates dissipate energy by undergoing bending strain, the treatment in the vicinity of lines of contra-flexure contributes little to the total damping. This report investigated the effect of concentrating the treatment in the regions of highest bending moment in order to use all the material more effectively. Three methods of analysis were presented, two of them being approximate but relatively rapid in use. The third has been used in extensive digital computer calculations to determine the effectiveness of given quantities of treatment, having given stiffness, when distributed over different proportions of the length of a vibrating, simply supported strip. The effectiveness has been assessed using certain criteria which apply to different problems, e.g. to the problems of reducing harmonic resonant vibration amplitudes, or inertia forces exerted by randomly vibrating panels, etc. Different criteria relate to each problem. It has been shown that very considerable increases of effectiveness are obtained by concentrating the treatment over a proportion of the length or area. For a given quantity and stiffness of treatment, the effectiveness may be maximised by covering certain optimum proportions.

6 citations