Free vibration characteristics of damped sandwich panel stiffened with damped stringers
About: This article is published in Journal of Sound and Vibration.The article was published on 1987-09-08. It has received 2 citations till now. The article focuses on the topics: Sandwich panel.
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TL;DR: In this paper, a composite stiffened thin-plate (CSTP) is developed, the filler is distributed periodically in the viscoelastic damping material (VDM), and the simplified-super-finite-element (SSFM) is employed in the analysis.
Abstract: In this paper, a new composite stiffened thin-plate (CSTP) is developed, the filler is distributed periodically in the viscoelastic damping material (VDM), and the simplified-super-finite-element (SSFM) is employed in the analysis. According to the periodical properties of the CSTP, a primitive cell is extracted, which is divided into six parts according to n-order Lagrangian element (LgE). After each parts’ mass, stiffness and damping matrices are obtained, the global matrices are assembled by standard direct stiffness method (SDSM). The filler's mass is considered as lump mass loaded on the defined LgE's nodes, and the filler's number is determined by the LgE's order. Then, the element matrices are simplified and compressed by Bloch's theorem. Finally, the band gap properties of the CSTP are determined according to the eigenvalues problems, and the parameters of the structures (such as the filler's mass, the VDM's damping ratio and the lattice constant, etc.) which affect the band gaps are examined thoroughly. The results show the existence of full band gap (FBG) in low frequency. Meanwhile, the results are validated by the finite element method (FEM), which show good consistency.
21 citations
TL;DR: The structural dynamic property of periodically and orthogonally stiffened composite laminar (POSCL) embedded within viscoelastic damping material (VDM) is studied with the asymptotic homogenization analysis method (AHAM) in this paper.
Abstract: The structural dynamic property of periodically and orthogonally stiffened composite laminar (POSCL) embedded within viscoelastic damping material (VDM) is studied with the asymptotic homogenization analysis method (AHAM) in this paper. A representative unit-cell (RUC) that includes the periodical property of POSCL is extracted from the structure. With the in-plane variables obtained by zigzag laminated theory (ZZLT), the energy equilibrium equation is established based on Hamilton's principle. The equilibrium equations of shear deformation are built by considering the inner shear and initial deformation between the stiffener and the face layers. By introducing the ‘rapid’ asymptotic factor, the equilibrium equations are expanded by AHAM, and then, the frequency- and temperature-dependent coefficients for all variables are obtained. Finally, the structural loss factor (SLF) of POSCL is determined. In this stage, the factors that affect the POSCL's SLF are thoroughly studied at different temperatures. Validation and comparison are presented at the end of this paper, and the results show that there are advantages to current structures in engineering application.
15 citations
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24 citations
TL;DR: In this article, a damped stiffened panel with applied viscoelastic damping on the flanges of the stiffeners is studied using finite element method, and the effect of the geometric and material properties of the damping layer treatment on the resonant frequencies and loss factors of the composite panel are presented.
9 citations
TL;DR: In this paper, the free vibration characteristics of a periodically stiffened panel with unconstrained viscoelastic damping layers applied to the flanges of the stringers are analyzed by using the wave propagation approach.
8 citations
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