On Sound Transmission into an Orthotropic Shell
A mathematical model is presented for the transmission of airborne noise through the walls of an orthotropic cylindrical shell. Parameters were varied to see how orthotropicity affected noise transmission. When compared to that for an isotropic shell, the cylinder transmission loss was found to be quite sensitive to the ratio of circumferential to axial modulus of elasticity. A modulus ratio greater than unity appears to enhance transmission loss in the mass-controlled region, while a ratio less than unity degrades it. Below the ring frequency, the trends appear to be reversed. The cylinder transmission loss appears to be relatively insensitive to changes in the shear modulus.
L. R. Koval, "On Sound Transmission into an Orthotropic Shell," Journal of Sound and Vibration, Elsevier, Jan 1979.
The definitive version is available at https://doi.org/10.1016/0022-460X(79)90376-6
Mechanical and Aerospace Engineering
Article - Journal
© 1979 Elsevier, All rights reserved.