Heavy Diesel Truck Pass

How it's made

Source

a six-cylinder four-stroke diesel at 950–1600 rpm: firing frequency rpm/20, with eight declining harmonics, crankshaft subharmonic and small cyclic and random speed fluctuations.

Body

exhaust pressure at 48–80 Hz and its harmonics under broad 110 Hz chassis rumble and 650 Hz combustion clatter. Low-Q filters colour independent noise; subsonic energy is removed.

Road

independent front and rear tire contact noise, separated by a 5.6 m wheelbase, combines 200–1400 Hz tread roar with 1–6 kHz friction. Wet pavement increases high-band spray.

Motion

a straight road at 11–29 m/s and 5–28 m clearance. Each source follows its own distance, radial-velocity Doppler factor 343/(343+v*x/r), air absorption and continuous stereo trajectory.

Envelope

closest cab passage at 2.15 s, with rear tires and exhaust following. Inverse-distance swells have soft 0.3 s onset and 0.75 s exit windows, reaching silence at 4.9 s.

Variation

seeded harmonic phases, engine tuning and independent surface fluctuations. Presets cover loaded low gear, highway speed, a distant roadside view and wet-road reverse travel.

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