免费声学共振计算器
计算管道或空腔的声学共振频率。
谐振频率
21.4375 Hz
Resonant Frequency vs Room Length (Lx)
公式
## 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)** - *c* = 343 m/s (speed of sound in air) - *Lx, Ly, Lz* = room dimensions - *nx, ny, nz* = mode numbers (non-negative integers, not all zero) Axial modes (one non-zero index) are strongest. Tangential (two) and oblique (three) modes are progressively weaker.
计算示例
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
常见问题
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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