Automatic Door Whoosh

How it's made

Source

a belt-driven electric motor slides shop door leaves; sinusoidal motor partials at 95-210 Hz and a quiet 6.3x commutation whine follow acceleration, cruise and controlled braking.

Body

broad 170-380 Hz rubber-belt hum and 450-1400 Hz rail friction use filtered pink noise; 18-30 Hz amplitude ripple represents pulley loading without discrete rattles or gear clicks.

Air

displaced air and brush seals form a wide 350-2600 Hz swish, brightening with travel speed; independent left and right turbulence stays narrow enough to retain a solid centred mechanism.

Envelope

0.25 s acceleration, sustained glide and 0.45 s deceleration over a 1.78 s default travel; a rounded 18 ms rubber-stop compression at travel end decays within 0.16 s. No pressure-release hiss.

Variation

seeded motor tuning within 1.2 percent and slow belt-load wander; travel sets timing, weight lowers motor and frame pitch, motor balances drive noise, and air controls displaced airflow.

Presets

quiet boutique drive, brisk light leaves, wide airy entrance and heavy slow double leaves. The effect is dry; all sources fade to zero and subsonic energy is removed.

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.