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
%
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