Response of clamped sandwich panels with viscoelastic core under random acoustic excitation
TL;DR: In this article, the acceleration response of square sandwich panels with clamped boundaries under a specific random acoustic excitation was evaluated by applying Galerkin's procedure and generalized harmonic analysis was used to compute the response spectrum.
About: This article is published in Journal of Sound and Vibration.The article was published on 1981-04-22. It has received 3 citations till now. The article focuses on the topics: Sandwich-structured composite & Response spectrum.
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TL;DR: In this article, free vibrations and the transverse response of sandwich plates with viscoelastic cores under wide-band random excitation are studied with special attention to the so-called pumping, thickness-shear and stretching modes.
Abstract: Free vibrations and the transverse response of sandwich plates with viscoelastic cores under wide-band random excitation is studied with special attention to the so-called pumping, thickness-shear and stretching modes. The quadratic displacement field is adopted for all displacement components of the core to accurately capture the higher modes excited by the wide-band excitation. The Love-Kirchhoff plate theory is used for the face layers. The viscoelastic behavior of the core is modeled by the Golla–Hughes–McTavish method. An analytical solution using the normal mode method is provided for the simply supported boundary conditions by including a different family of modes. The effects of some geometric and material properties on the frequencies, damping ratios and also root mean square responses are explored. The participation of the through-the-thickness deformation in the bending mode vibration of the top layer is also investigated, which is found to be mostly resulting from the second order term of the ...
25 citations
TL;DR: In this article, the authors explored an idea of adapting the static and dynamic material distribution of panels through embedded microvascular channels and strategically placed voids that permit the internal movement of fluids within the panels for structural dynamic control.
3 citations
01 Jan 2016
TL;DR: In this paper, the influence of the one close natural frequencies of the asymmetric modes of a near modal response and the on modeling of the mid led to both geo layer, a single integral viscoelastic model is used.
Abstract: The nonlinear vibration of sandwich viscoelastic plates under wide investigated. The main focus is on the influence of the one close natural frequencies of the asymmetric modes of a near modal response and the on modeling of the mid led to both geo layer, a single integral viscoelastic model is used. The displacement field in the thickness direction is also assumed to be linear for the in Moreover, the Kirchhoff theory with the von solution is initiated by applying the perturbation method along with the Galerkin's method to obtain integro non with the aid of the Pseudo modal response and the minimum excitation intensity required for the nonlinear interaction between asymmetric modes
Additional excerpts
...(4) 0 = 1 2 ( 0 , ( ) + 0 , ( ) + 0 3, ( ) 0 3, ( ) ) 1 = 1 2 1 , ( ) + 1 , ( ) , 2 = 0 0 3 = 1 2 1 ( ) + 0 3, ( ) + 1 3 ( ) 0 3, ( ) + 0 , ( ) 1 ( ) =1,2 1 3 = 1 2 1 3, ( ) + 1 , ( ) 1 ( ) =1,2 , 2 3 = 1 2 2 3, ( ) , 0 33 = 1 3 ( ) + 1 2 1 ( ) =1,2 2 , 1 33 = 2 2 3 ( ) , 2 33 = 0...
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References
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TL;DR: In this paper, the authors present an approach to resist jet noise fatigue using a knowledge of a wide range of subjects from pure acoustics at one end to metal physics at the other.
Abstract: The design of structures to resist jet noise fatigue demands a knowledge of a wide range of subjects from pure acoustics at one end to metal physics at the other. At the present time the various aspects of the problem are not sufficiently well known quantitatively for a purely theoretical design study to be made. Nevertheless a knowledge of the behaviour of typical forms of construction in noise environments can be used with a limited amount of theoretical work to indicate the most efficient types of structure. This approach to the problem is adopted in this lecture as it seems to be the most promising one available at the moment. It must be emphasised, however, that although some progress has been made in discovering the behaviour of a structure subjected to noise it is not possible to estimate the life of any component at the drawing board stage. Some prototype strain measurements and proof testing are therefore essential if one is to prove the integrity of the design.
19 citations
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
13 citations
01 Aug 1965
TL;DR: In this paper, a review is made of those aspects of vibration and transmitted noise which may be alleviated by increasing the structural damping and alternative criteria are derived which describe more adequately the effectiveness of the treatment in attenuating certain random and harmonic vibration phenomena.
Abstract: : Data are presented on the vibration of aeroplane structures excited by jet-noise or other random pressures. A review is made of those aspects of vibration and transmitted noise which may be alleviated by increasing the structural damping. The damping of conventional untreated structures is considered, measured values of the damping of model and full-scale structures are discussed in the light of previous studies of acoustic and rivet damping. The common practice of judging a damping treatment by the loss factor increment it produces is shown to be inadequate for contemporary treatments and thin-plate structures. Alternative criteria are derived which describe more adequately the effectiveness of the treatment in attenuating certain random and harmonic vibration phenomena. These were used to compare two commercial unconstrained treatments and to estimate the reduction of random stresses in an aeroplane structure when the treatments are added. The response of a two-dimensional flat sandwich plate with a damped core was analysed. The dependence of the modal loss factor, stiffness and criteria values on the wavelength and core properties was studied.
12 citations
TL;DR: In this paper, the displacement response of simply supported orthotropic sandwich plates is investigated analytically and the source of random excitation is assumed to be an ideal white noise uniformly distributed over the plate.
11 citations