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 article, a general analysis is made using the ideas of vibration theory and spectrum analysis, on the assumption that the forced modes of vibration of a structure, subjected to pressure fluctuations random in time and space, can be approximated by the composition of the motions of the uncoupled natural modes.
Abstract: On the assumption that the forced modes of vibration of a structure, subjected to pressure fluctuations random in time and space, can be approximated by the composition of the motions of the uncoupled natural modes, a general analysis is made using the ideas of vibration theory and spectrum analysis. The power spectrum, and hence the rms value, of any quantity depending linearly upon structural distortions is derived and it involves a quantity (called the “joint acceptance”) concerning the spacewise structure of the pressure field and of the geometry of the modes of vibration. It is shown how this result may be used (on assuming “normal” randomness) to estimate the fatigue life on the hypothesis of cumulative damage.
138 citations
75 citations
59 citations
43 citations
TL;DR: In this paper, a statistical approach to the dynamic response of a system is presented, where the response of the system displays no orderly trends and instantaneous values and phase are meaningless in such cases.
Abstract: : Mechanical systems are not always excited by a harmonic force of fixed frequency and amplitude. Often the excitation input is of random nature, and the response of the system displays no orderly trends. Instantaneous values and phase are meaningless in such cases, and the problem must be treated from a statistical approach. It is the purpose of the paper to outline such an approach as related to the dynamic response of structures.
26 citations