The numerical modeling of highly damped viscoelastic materials is critical for aerospace applications such as dynamic analysis of solid rocket motors – showing high damping ratios due to the presence of solid propellant – and design of passive damping devices for minimizing vibrations in aeronautical and space systems. Time-domain viscous damping models – giving damping forces proportional to velocities – are directly applicable in transient simulations, but they give a frequency-linear dissipative behavior which has no experimental evidence. On the other hand, frequency-domain hysteretic damping models – giving damping forces proportional to displacements – result in a frequency-constant dissipation that better describes the behavior of certain materials. However, using such models in transient analyses may give unphysical, non–Hermitian and non-causal system response. This paper reviews a class of first-principle-based damping models commonly used in structural dynamics by deriving them as particular cases of a general continuum mechanics formulation. The proposed damping models are tuned, in their frequency-domain description, on material experimental data so providing a Hermitian and causal time-domain responses, and they are applied to highly damped, practical aerospace structures via Finite Element models. The proposed model is applied to two aerospace systems: a scaled-down test article dynamically representative of a solid rocket motor launch-vehicle stage and a two-dimensional airfoil with passive viscoelastic dampers for flutter suppression.

Time- and frequency-domain linear viscoelastic modeling of highly damped aerospace structures / Mastroddi, F.; Martarelli, Fabio; Eugeni, M.; Riso, C.. - In: MECHANICAL SYSTEMS AND SIGNAL PROCESSING. - ISSN 0888-3270. - 122:(2019), pp. 42-55. [10.1016/j.ymssp.2018.12.023]

Time- and frequency-domain linear viscoelastic modeling of highly damped aerospace structures

Mastroddi, F.
Methodology
;
MARTARELLI, Fabio
Validation
;
Eugeni, M.
Investigation
;
Riso, C.
Investigation
2019

Abstract

The numerical modeling of highly damped viscoelastic materials is critical for aerospace applications such as dynamic analysis of solid rocket motors – showing high damping ratios due to the presence of solid propellant – and design of passive damping devices for minimizing vibrations in aeronautical and space systems. Time-domain viscous damping models – giving damping forces proportional to velocities – are directly applicable in transient simulations, but they give a frequency-linear dissipative behavior which has no experimental evidence. On the other hand, frequency-domain hysteretic damping models – giving damping forces proportional to displacements – result in a frequency-constant dissipation that better describes the behavior of certain materials. However, using such models in transient analyses may give unphysical, non–Hermitian and non-causal system response. This paper reviews a class of first-principle-based damping models commonly used in structural dynamics by deriving them as particular cases of a general continuum mechanics formulation. The proposed damping models are tuned, in their frequency-domain description, on material experimental data so providing a Hermitian and causal time-domain responses, and they are applied to highly damped, practical aerospace structures via Finite Element models. The proposed model is applied to two aerospace systems: a scaled-down test article dynamically representative of a solid rocket motor launch-vehicle stage and a two-dimensional airfoil with passive viscoelastic dampers for flutter suppression.
2019
causal systems; hermitian systems; highly damped structures; passive flutter suppression; solid propellant modeling; viscoelastic materials; control and systems engineering; signal processing; civil and structural engineering; aerospace engineering; mechanical engineering; computer science applications1707 computer vision and pattern recognition
01 Pubblicazione su rivista::01a Articolo in rivista
Time- and frequency-domain linear viscoelastic modeling of highly damped aerospace structures / Mastroddi, F.; Martarelli, Fabio; Eugeni, M.; Riso, C.. - In: MECHANICAL SYSTEMS AND SIGNAL PROCESSING. - ISSN 0888-3270. - 122:(2019), pp. 42-55. [10.1016/j.ymssp.2018.12.023]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1240452
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