An analysis of passive magnetic composites for suppressing the vibration of beams

Article type: Research Article

Authors: Oh, J.^a | Ruzzene, M.^a | Baz, A.^b

Affiliations: [a] Mechanical Engineering Department, The Catholic University of America, Washington, DC 20064, USA. Tel.: +1 202 319 5103; Fax: +1 202 319 4499; E-mail: ruzzene@cua.edu | [b] Mechanical Engineering Department, University of Maryland, College Park, MD 20742, USA. Tel.: +1 301 405 5216; Fax: +1 301 405 8331; E-mail: baz@eng.umd.edu

Abstract: The fundamentals of controlling the structural vibration of beams treated with a new class of Passive Magnetic Composites (PMC) are studied. The PMC is a constrained damping treatment, where a viscoelastic core is sandwiched between two layers of permanent magnets. The interaction forces between the magnets aim at enhancing the damping characteristics of the viscoelastic. The effectiveness of such treatments is demonstrated both numerically and experimentally. In particular, a finite element code is developed to model the interaction between the dynamic behavior of the beam, the viscoelastic layer and magnetic layers. The model is validated experimentally at various operating conditions and the performance of the treatment is evaluated for different configurations of the magnetic layers. The obtained results suggest the potential of the new class of PMC as an effective and simple mean for controlling structural vibrations.

DOI: 10.3233/JAE-2000-175

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 11, no. 2, pp. 93-114, 2000