Critical Frequency Calculator

Choose a material in the database

Density (kg/m³):

Module de Young (MPa):

Thickness (m):

Poisson Modulus:

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The Critical Frequency appears when the bending wavelength is equal to the acoustic wavelength (or the celerity of the bending wave is equal to the sound celerity) :
$f_{c} = \frac{c_{0}^{2}}{2 \sqrt{\frac{ρ_{s}}{B_{p}}}} = \frac{c_{0}^{3}}{\sqrt{π}} \sqrt{\frac{3 ρ_{s} (1 - ν^{2})}{E h^{3}}}$ with :

$ρ_{s}$ the mass per square meter (m²)
$E$ the Young Modulus (Pa)
$ν$ the Poisson Modulus
$h$ the thickness (m)
$c_{0}$ the sound celerity (m/s)

References : Sound Insulation - Carl Hopkins
And to calculate the complete transmission loss of materials, use AcouVApp Insul