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Critical Frequency Calculator





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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) :
$$ f_c = \frac{c_0^2}{2\sqrt{\frac{\rho_s}{B_p}}} = \frac{c_0^3}{\sqrt{\pi}} \sqrt{\frac{3\rho_s(1-\nu^2)}{Eh^3}} $$ with :

  • \( \rho_s \) the mass per square meter (m²)
  • \( E \) the Young Modulus (Pa)
  • \( \nu \) 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


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