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Research Papers

Nonviscous Modes of Nonproportionally Damped Viscoelastic Systems

[+] Author and Article Information
Mario Lázaro

Department of Continuum Mechanics
and Theory of Structures,
Universitat Politècnica de València,
Valencia 46022, Spain
e-mail: malana@mes.upv.es

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received July 15, 2015; final manuscript received September 9, 2015; published online October 1, 2015. Assoc. Editor: Nick Aravas.

J. Appl. Mech 82(12), 121011 (Oct 01, 2015) (9 pages) Paper No: JAM-15-1369; doi: 10.1115/1.4031569 History: Received July 15, 2015; Revised September 09, 2015

Nonviscously damped vibrating systems are characterized by dissipative mechanisms depending on the time-history of the response velocity, introduced in the physical models using convolution integrals involving hereditary kernel functions. One of the most used damping viscoelastic models is the Biot's model, whose hereditary functions are assumed to be exponential kernels. The free-motion equations of these types of nonviscous systems lead to a nonlinear eigenvalue problem enclosing certain number of the so-called nonviscous modes with nonoscillatory nature. Traditionally, the nonviscous modes (eigenvalues and eigenvectors) for nonproportional systems have been computed using the state-space approach, computationally expensive. In this paper, we address this problem developing a new method, computationally more efficient than that based on the state-space approach. It will be shown that real eigenvalues and eigenvectors of viscoelastically damped system can be obtained from a linear eigenvalue problem with the same size as the physical system. The numerical approach can even be enhanced to solve highly damped problems. The theoretical results are validated using a numerical example.

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Figures

Grahic Jump Location
Fig. 1

Numerical example: a 5DOF lumped mass system with viscoelastic dampers based on exponential kernels

Grahic Jump Location
Fig. 2

FRF H12() calculated from Eq. (48), calculated for LD (left) and for HD (right) cases. Upper curves represent the total FRFs He() + Hr(), while lower curves represent only the part associated to nonviscous modes, Hr().

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