Minimizing vibration response of cylindrical shells through layout optimization of passive constrained layer damping treatments

Active constrained layer damping of thin cylindrical shells

The Galerkin element method applied to the vibration of damped sandwich beams

An amplitude equation for the non-linear vibration of viscoelastically damped sandwich beams

A simple spinning laminated composite shaft model

The governing equations of motion for the nonaxisymmetric and axisymmetric variational of a general multilayered cylindrical shell having an arbitrary number of orthotropic material layers have been derived using variational principles. The refined analysis considers bending, extension, and shear deformations in all layers of a multilayered cylindrical shell, including rotary and longitudinal translatory as well as transverse inertias. The solution for a radially simply supported shell has been obtained and the procedure for determining the damping effectiveness in terms of the system loss factor for all families of the modes of vibration in a multilayered shell with elastic and viscoelastic layers is reported. Numerical results are reported in Part II of the paper.

Vibration and damping analysis of a multilayered cylindrical shell. I - Theoretical analysis

La premiere partie a presente la solution de l'analyse de vibration et d'amortissement d'une coque cylindrique generale a plusieurs couches, composee d'un nombre arbitraire de couches viscoelastiques et elastiques d'un materiau orthotrope, avec des conditions de simple supportage aux extremites. La solution a ete programmee sur ordinateur IBM 360 pour l'evaluation des frequences de resonance et les facteurs de perte associes pour toutes les familles de modes ayant les vibrations axisymetriques et non axisymetriques de l'enveloppe multicouches. Le cas d'enveloppes a 3, 5, et 7 couches alternativement elastiques et viscoelastiques a ete examine

Naiyar Alam

Papers

Vibration and damping analysis of a multilayered cylindrical shell. I - Theoretical analysis

Vibration and Damping Analysis of a Multilayered Cylindrical Shell, Part 11: Numerical Results