Vibration Analysis of Cylindrical Sandwich Aluminum Shell with Viscoelastic Damping Treatment

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.

Development of tomography–transmission electron microscope (TEM) specimen holder stable under acoustic disturbances

“…Moreover, special damping layers made of viscoelastic materials are widely applied in structures subjected to dynamic loading to reduces the vibrations. [28][29][30][31][32] The vibration analyses were performed using the commercially available package ANSYS. The acoustic noise in this study is restricted to vibrations caused by internal sources (human voice and fans, etc.).…”

“…To decrease the vibration energy of the holder under acoustic disturbances, viscoelastic layers have been commonly used. [28][29][30][31][32] Viscoelastic materials used in such applications are used to dissipate energy when subjected to alternating deformation. The holder as shown in Figure 7 is partially covered by 28 damping a constraining layer.…”

Vibration and Damping Analysis of Composite Fiber Reinforced Wind Blade with Viscoelastic Damping Control

“…To derive the governing equation of motion for the composite cylindrical shell with viscoelastic damping layers can be obtained as the following equation [17]:…”

“…Figure 1 shows a geometry structure of fiber reinforced cylindrical composite shell with viscoelastic damping layer, where 900 and 850 are glass fiber layer and is viscoelastic damping layer where is the −45-degree aligned continuous fibers, the 45-degree aligned continuous fibers, and the 0-degree aligned continuous fibers. Based on the full layerwise shell theory, the displacement fields ( , V, and ) on the cylindrical coordinate system can be expressed by containing the piecewise interpolation function along thickness -direction and finite element shape functions as below [16,17]:…”

The semi-analytical method for damping of tubular transition layer damping structure

“…Xiong-tao Cao et al [3] studied the free vibration characteristics of passive tubular damping structure and solved the vibration equation of PCLD tubular structure simply supported at both ends by using wave propagation method. Cheng-feng Liu et al [4] conducted topological optimization analysis and experimental research on the tubular damping structure by using evolutionary structural optimization; Being aimed at the vibration characteristics, Hui-rong Shi et al [5] gave the local tubular damping structure model, analyzed the vibration characteristics and optimized it; Tai-hong Chen et al [6] analyzed the damping effect of aluminum tube with a constrained damping layer by using layer by layer displacement theory. They compared the natural frequency, modal loss factor and frequency response of the damping tube with the original one and drew the conclusion that the constrained damping tubular structure could reduce vibration effectively.…”