Calculadora de Ressonância Acústica
Calcule as frequências de ressonância em tubos abertos e fechados. Determine harmônicos fundamentais e superiores para design acústico.
Frequência de Ressonância
21.4375 Hz
Resonant Frequency vs Room Length (Lx)
Formula
Room Acoustic Modes
A rectangular room supports standing waves at specific resonant frequencies determined by its dimensions.
Formula
f(nx,ny,nz) = (c/2) sqrt((nx/Lx)^2 + (ny/Ly)^2 + (nz/Lz)^2)
Axial modes (one non-zero index) are strongest. Tangential (two) and oblique (three) modes are progressively weaker.
Exemplo Resolvido
Room 8 x 5 x 3 m, first axial mode along length (1,0,0).
- 01f = (343/2) * sqrt((1/8)^2 + 0 + 0)
- 02f = 171.5 * sqrt(0.015625)
- 03f = 171.5 * 0.125
- 04f = 21.44 Hz
Perguntas Frequentes
Why do room modes cause problems?
At resonant frequencies, sound builds up at certain positions and cancels at others, creating uneven bass response. This is why studio control rooms use non-parallel walls or bass traps.
What are the ideal room dimension ratios?
Ratios like 1:1.26:1.59 or 1:1.4:1.9 (from Bolt or Louden criteria) distribute modes more evenly, avoiding clustering of resonances.
Can room modes be eliminated?
No, but they can be managed with bass traps (absorption at room boundaries), equalization, and choosing good room proportions.
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