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Proceedings Paper

Vibration control of cylindrical shells using active constrained layer damping
Author(s): Manas Chandra Ray; Tung-Huei Chen; Amr M. Baz
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Paper Abstract

The fundamentals of controlling the structural vibration of cylindrical shells treated with active constrained layer damping (ACLD) treatments are presented. The effectiveness of the ACLD treatments in enhancing the damping characteristics of thin cylindrical shells is demonstrated theoretically and experimentally. A finite element model (FEM) is developed to describe the dynamic interaction between the shells and the ACLD treatments. The FEM is used to predict the natural frequencies and the modal loss factors of shells which are partially treated with patches of the ACLD treatments. The predictions of the FEM are validated experimentally using stainless steel cylinders which are 20.32 cm in diameter, 30.4 cm in length and 0.05 cm in thickness. The cylinders are treated with ACLD patches of different configurations in order to target single or multi-modes of lobar vibrations. The ACLD patches used are made of DYAD 606 visco-elastic layer which is sandwiched between two layers of PVDF piezo-electric films. Vibration attenuations of 85% are obtained with maximum control voltage of 40 volts. Such attenuations are attributed to the effectiveness of the ACLD treatment in increasing the modal damping ratios by about a factor of four over those of conventional passive constrained layer damping (PCLD) treatments. The obtained results suggest the potential of the ACLD treatments in controlling the vibration of cylindrical shells which constitute the major building block of many critical structures such as cabins of aircrafts, hulls of submarines and bodies of rockets and missiles.

Paper Details

Date Published: 9 May 1997
PDF: 22 pages
Proc. SPIE 3045, Smart Structures and Materials 1997: Passive Damping and Isolation, (9 May 1997); doi: 10.1117/12.274209
Show Author Affiliations
Manas Chandra Ray, Catholic Univ. of America (United States)
Tung-Huei Chen, Catholic Univ. of America (United States)
Amr M. Baz, Catholic Univ. of America (United States)

Published in SPIE Proceedings Vol. 3045:
Smart Structures and Materials 1997: Passive Damping and Isolation
L. Porter Davis, Editor(s)

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