Damping characteristics of elastic-viscoelastic composite shafts

✍ Scribed by M.P. Chandrasekharan; A. Ghosh

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 614 KB
• Volume: 37
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1016/s0022-460x(74)80053-2

✦ Synopsis

This is a report on a theoretical investigation into the damping characteristics of a composite shaft, with an elastic-viscoelastic core, in torsional oscillation. It has been established that considerable damping capacity can be achieved in such systems. The static deformation equations are derived from the theory of elasticity. Expressions for the complex stiffness of the shaft and the overall damping factor of the system are obtained from an "equivalent Voigt model" for the entire system. An extensive parametric study is conducted and the existence of optimal geometric conditions is established.

The system is analysed as a dynamic model, and the numerical solutions are obtained from the resulting differential equations. The results are compared with those from the equivalent Voigt model for some particular cases. The existence of optimal conditions is corroborated by the numerical results; the orders of magnitudes of damping factors are found to be the same.

Solutions obtained with the aid of an analog computer add further evidence to that of results obtained earlier.