免费声功率计算器

计算声源的声功率和声功率级。

W

Sound Power Level

100.00 dB

Intensity at 1 m (free field)0.00079577 W/m2

Sound Power Level vs Sound Power

查看公式 →

公式

## Sound Power Level Sound power is the total acoustic energy emitted by a source per second, independent of distance or room. ### Formula **Lw = 10 log10(W / W0)** - *W* = sound power (watts) - *W0* = 10^-12 W (reference) Sound power is an intrinsic property of the source. Intensity at distance r in free field: I = W / (4 pi r^2).

计算示例

A loudspeaker emitting 0.01 W.

  1. 01Lw = 10 log10(0.01 / 1e-12)
  2. 02Lw = 10 log10(1e10)
  3. 03Lw = 10 * 10 = 100 dB
  4. 04Intensity at 1 m = 0.01 / (4 pi) = 7.96e-4 W/m2