Abstract
This paper has applied the constrained viscoelastic layer damping treatments to a cylindrical aluminum shell using layerwise displacement theory. The transverse shear, the normal strains, and the curved geometry are exactly taken into account in the present layerwise shell model, which can depict the zig-zag in-plane and out-of-plane displacements. The damped natural frequencies, modal loss factors, and frequency response functions of cylindrical viscoelastic aluminum shells are compared with those of the base thick aluminum panel without a viscoelastic layer. The thickness and damping ratio of the viscoelastic damping layer, the curvature of proposed cylindrical aluminum structure, and placement of damping layer of the aluminum panel were investigated using frequency response function. The presented results show that the sandwiched viscoelastic damping layer can effectively suppress vibration of cylindrical aluminum structure.
Highlights
The cylindrical curved structure has been employed in many engineering applications, such as aircrafts, automobiles, ships, and other industrial machines
Studies on the vibrations characteristics of the cylindrical shells have been carried out extensively using numerical methods
The transverse shear, the normal strains, and the curved geometry are exactly taken into account in the present layerwise shell model, which can depict the zig-zag in-plane and out-ofplane displacements
Summary
The cylindrical curved structure has been employed in many engineering applications, such as aircrafts, automobiles, ships, and other industrial machines. Ross et al presented a general analysis of the viscoelastic structures [6] They described the damping mechanism of the viscoelastic material as in-plane and transverse shear deformations, RKU assumptions. Chen and Huang presented a study on optimal placement of PCLD treatment for vibration suppression of the plates [10] In their optimization, the structural damping plays the main performance index and the frequencies’ shift and constraint layer damping thickness act as penalty functions. Zheng et al have adopted genetic algorithm based penalty function method that is employed to find the optimal layout of rectangular passive constrained layer damping patches aiming to minimize the structural volume displacement. A viscoelastic constrained layer damping treatment was employed to minimize vibration of a cylindrical aluminum panel using layerwise finite element theory, the base structure, and the constraining layer.
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