Date of Award
Summer 1990
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Mechanical & Aerospace Engineering
Program/Concentration
Engineering Mechanics
Committee Director
Thomas E. Alberts
Committee Member
Gene Hou
Committee Member
Chuh Mei
Call Number for Print
Special Collections; LD4331.E57C4469
Abstract
It has been demonstrated that constrained viscoelastic layer damping treatments provide an effective means of passive control for structural vibration. These treatments dissipate vibrational energy by inducing shear strain in a thin layer of viscoelastic material. Our interest is in adding passive damping to a structure as an augmentation to active control. For such applications it is desirable to achieve high damping performance in a given frequency range with a minimum of added weight. Most damping treatments employ spatially continuous constraining layers over the entire viscoelastic layer. Plunkett and Lee have shown that the effectiveness of the damping treatment can be significantly increased by sectioning the constraining layer into segments of optimal length for the target frequency range. This thesis uses Plunkett and Lee's method to determine the optimal length of the constraining layer segment, which produces the best damping performance. The analysis begins with basic structures, a simple aluminum flat beam and a thin walled aluminum tube. The basic structures can be considered to represent the arm of a single-link flexible robot experiment. The damping material utilized is 3M ScotchdampTM SJ2015 type 110 viscoelastic polymer (3M ISD-110) and the constraining layer is 10 mil steel (1025) shim. Data is presented to compare experimental results with theoretical and finite element predictions. The finite element model was developed based on MSC/NASTRAN code. The theoretical method generally over predicts the damping ratio in comparison with experimental data, while the finite element method predicts the actual damping and frequency with greater proficiency
Rights
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DOI
10.25777/p22z-wm98
Recommended Citation
Chen, Yung.
"Finite Element Analysis of Structures with Constrained Viscoelastic Layer Damping"
(1990). Master of Science (MS), Thesis, Mechanical & Aerospace Engineering, Old Dominion University, DOI: 10.25777/p22z-wm98
https://digitalcommons.odu.edu/mae_etds/450
Included in
Engineering Mechanics Commons, Mechanical Engineering Commons, Structural Materials Commons