Internal Combustion Engine Acoustic Synthesis

Real-time physics-based sound generation

Tap Start
70%
20 Hz100 Hz500 Hz2 kHz10 kHz
RPM
0
 
Firing
0
Hz
Crank
0
rev/s
Pipe Res
78
Hz
Misfire
0
%

Engine

Exhaust

Turbocharger Off
Flutter
Boost:
0%

Synthesis

Impulse70%
Harmonics10%
Bass60%
Mechanical30%

Firing Pattern (720°)

Startup Sequence

1.8s
0.8s
1.50x
0.6s
2.5s
1.2Hz

Governing Equations

Firing Freq
\[ f = \frac{N n}{60 k} \]
N=RPM, n=cyl, k=2
Impulse
\[ p = Ae^{-\alpha t}\sin\omega t \]
α=decay, ω=freq
Harmonics
\[ H = \sum a_n\sin n\phi \]
aₙ=amplitudes
Resonance
\[ f = \frac{c}{2L} \]
c=343m/s, L=pipe