How Decibel Addition Works

适用场景

Use this guide when multiple sources contribute and you need a fast combined level estimate with clear assumptions.

要使用的工具

Browser-based preliminary check for Decibel Addition Calculator — fast estimates, not code or stamped design output.

打开 Decibel Addition Calculator →

步骤

  1. 1Convert each level from dB to linear intensity or pressure-squared space as your tool expects.
  2. 2Sum contributions and convert back to dB for the combined value.
  3. 3Treat tonal or coherent sources cautiously; simple addition may over or under predict.
  4. 4Compare against regulatory metrics only after you confirm which metric applies.
  5. 5Use narrowband or octave-band analysis when tonal penalties apply.

示例

  • Two machines side by side in a plant corner.
  • Fan plus airflow noise at a grille.

应避免

  • Adding dB values directly as if they were linear.
  • Ignoring that 0 dB contribution means no energy from that term.
  • Mixing dBA with dBC without a documented reason.

相关工具

博客

工程 中的更多内容

所有任务指南 或前往 工程 专区.

常见问题

Is this for HVAC A-weighting?

Weighting must match your compliance target; state it explicitly.

Coherent sources?

Use specialized interference models; incoherent addition is a common first pass only.

所有任务指南 · 工程 工具 · 博客