27 June 2002 Improving the MSE method for viscoelastic damped structures
Author Affiliations +
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.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Fabrizio L. Scarpa, Francesco P. Landi, Jem A. Rongong, L. DeWitt, 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); doi: 10.1117/12.472669; https://doi.org/10.1117/12.472669

Back to Top