# Helmholtz resonator
# Scope: Lumped Helmholtz resonator; effective neck length already includes end corrections.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

soundSpeed = 343 m/s
neckArea = 100 mm^2
volume = 1 L
effectiveLength = 30 mm

frequency := soundSpeed/(2*pi)*sqrt(neckArea/(volume*effectiveLength)) [Hz]

check resonance band upper: frequency <= 150 Hz

scenario alternative: soundSpeed = 274.4 m/s