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THE FEUTEX TOOLKIT

Helmholtz Resonator Tuning

Estimate resonator frequency from neck cross-section, effective neck length and cavity volume.

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01 Your input
02 Your result
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FormulaIdeal resonance = c/(2*PI)*sqrt(area/(length*volume))
Sources and model references

Worked example

Inputs

Neck area
0.001 m²
Effective neck length
0.1 m
Cavity volume
0.01 m³
Sound speed
343 m/s

Expected results

Ideal resonance
54.59014548 Hz

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Estimate resonator frequency from neck cross-section, effective neck length and cavity volume.
  2. Set neck area, effective neck length, cavity volume, sound speed in the indicated units.
  3. Calculate and compare ideal resonance.

Try this example

{
  "area": 0.001,
  "length": 0.1,
  "volume": 0.01,
  "c": 343
}

Accuracy and scope

Effective length must include end correction. Damping, leakage and nonideal geometry are excluded.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.