Vibro-acoustic characteristics of viscoelastic sandwich panel: effect of inherent damping

This paper presents the effect of the inherent material damping of aluminium facings and fibre reinforced polymer (FRP) core composite sandwich panel on vibro-acoustics and sound transmission loss characteristics. The modal strain energy method is used to calculate the modal damping ratio at each mo...

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Bibliographic Details
Published in:International journal of dynamics and control 2021-03, Vol.9 (1), p.33-43
Main Authors: Reddy, R. Kiran Kumar, Arunkumar, M. P., Bhagat, Vinod, Reddy, M. B. S. Sreekara
Format: Article
Language:English
Subjects:
Aluminum
Complexity
Control
Control and Systems Theory
Damping ratio
Dynamical Systems
Engineering
Facings
Fiber composites
Fiber reinforced plastics
Fiber reinforced polymers
Finite element method
Forced vibration
Fourier analysis
Harmonic analysis
Mathematical analysis
Metal plates
Modal damping
Sandwich panels
Sandwich structures
Sound transmission
Strain energy methods
Transmission loss
Vibration
Vibration analysis
Vibration response
Vibroacoustics
Weight analysis
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Summary:This paper presents the effect of the inherent material damping of aluminium facings and fibre reinforced polymer (FRP) core composite sandwich panel on vibro-acoustics and sound transmission loss characteristics. The modal strain energy method is used to calculate the modal damping ratio at each mode. To determine the forced vibration response, the harmonic analysis is carried out. From the kinematic continuity of velocity of the structure and the acoustic particle velocity at the surface, the sound power level is calculated. From the results, it is revealed that 19.89 dB of overall sound power level is reduced by including the modal damping ratio in the finite element modeling. Further, it is noticed that by replacing the aluminium plate to aluminium face sheet with an FRP core sandwich panel, the overall sound power level of 11.76 dB and 10.78 dB is reduced based on the same volume and weight analysis respectively.
ISSN:2195-268X
2195-2698
DOI:10.1007/s40435-020-00654-7