| Issue |
EPJ Web of Conferences
Volume 6, 2010
ICEM 14 – 14th International Conference on Experimental Mechanics
|
|
|---|---|---|
| Article Number | 41005 | |
| Number of page(s) | 8 | |
| Section | Structural Dynamics and Vibrations | |
| DOI | https://doi.org/10.1051/epjconf/20100641005 | |
| Published online | 10 June 2010 | |
https://doi.org/10.1051/epjconf/20100641005
Identification of honeycomb sandwich properties by high-resolution modal analysis
1
LMS-CNRS, École Polytechnique, 91128
Palaiseau Cedex,
France
2
LIMSI-CNRS, Universite Paris-Sud, B.P. 133, 91403
Orsay Cedex,
France
a e-mail: rebillat@lms.polytechnique.fr
A method is proposed to identify the mechanical properties of the skin and core materials of honeycomb sandwich. All the elastic coefficients and loss-factors that matter in the dynamics of a panel in the thick-plate approximation are identified. To this end, experimental natural modes (i.e. eigenmodes of the damped system) are compared to the numerical modes of a large sandwich panel (lx,y/h ≃ 80). The chosen generic model for the visco-elastic behaviour of the materials is E (1 + jη). The numerical modes are computed by means of a Rayleigh-Ritz procedure and their dampings are predicted according to the visco-elastic model. The frequencies and dampings of the natural modes of the panel are estimated experimentally by means of a high-resolution modal analysis technique. An optimisation procedure yields the desired coefficients. A sensitivity analysis assess the reliability of the method.
© Owned by the authors, published by EDP Sciences, 2010
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