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Reduction number

Calculates the reduction number for a simple wall, ie how much the wall dampens the sound.

Reduction number for frequencies below the critical.

Input Result
Thickness h=
Density ρ=
Frequency f=
Reduktionstal R= dB

Reduction number for frequencies above the critical.

Input Result
Thickness h=
Density ρ=
Frequency f=
Critical frequency f=
Dissipation factor η=
Reduktionstal R= dB

Explanations

Thickness

Refers to the thickness of the current floor.

Density

Refers to the density of the current floor layer, ie how heavy it is.

Dissipation factor

The loss factor describes the relatively lost energy per radius.

Frequency

The frequency is the periodic velocity of a sound wave, i.e. the number of oscillations per second the sound wave does. Frequency is measured in Hertz (Hz) which is a unit derived from the SI system and corresponds to 1 oscillation per second.

Critical frequency

At what frequency the building component in question creates resonance.

Reduction number

The reduction number is defined as a relationship between incident sound effect on one side of a wall and transmitted sound effect to the other side of the same wall.

Formula

Reduction number fc>f: Reduction number
Reduction number f>fc: Reduction number