Improving the MSE method for viscoelastic damped structures

Fabrizio L. Scarpa; Francesco P. Landi; Jem A. Rongong; L. DeWitt; Geoffrey R. Tomlinson

doi:10.1117/12.472669

27 June 2002 Improving the MSE method for viscoelastic damped structures

Fabrizio L. Scarpa, Francesco P. Landi, Jem A. Rongong, L. DeWitt, Geoffrey R. Tomlinson

Proceedings Volume 4697, Smart Structures and Materials 2002: Damping and Isolation; (2002) https://doi.org/10.1117/12.472669
Event: SPIE's 9th Annual International Symposium on Smart Structures and Materials, 2002, San Diego, California, United States

Abstract

In this paper different numerical techniques are suggested to improve the prediction of natural frequencies and modal loss factors of structures with viscoelastic damping. The suggested methods involve the use of classical Finite Element mass and stiffness matrices and the knowledge of the undamped modal basis of the system. One technique is based is based on a dyadic matrix perturbation approach that gives control over the approximation sought for the natural frequencies and modal loss factors. Unlike other perturbation techniques, the proposed method does not involve the solution of linear system equations. Two other methods suggested involve IRS techniques that use either static or low frequency reduction with weighted damping to condense the full complex eigenvalue system into a real one. During the solution spurious modes are eliminated via a modified Modal Assurance Criteria. All the proposed methods give good approximations of the exact complex solutions without the need for a complex eigensolver and therefore can be used with existing eigensolution routines available in commercial FE codes.

Citation Download Citation

Fabrizio L. Scarpa, Francesco P. Landi, Jem A. Rongong, L. DeWitt, and Geoffrey R. Tomlinson "Improving the MSE method for viscoelastic damped structures", Proc. SPIE 4697, Smart Structures and Materials 2002: Damping and Isolation, (27 June 2002); https://doi.org/10.1117/12.472669

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