16.2 Mass moments of inertia
The mass-moments of inertia of the main engines (including flywheel) are typically as follows:
J (kg m
2
)EngineJ (kg m
2
)Engine
890 – 990
980 – 1080
14V31
16V31
640 – 740
720 – 820
800 – 900
8V31
10V31
12V31
16.3 Air borne noise
The airborne noise of an engine is measured as sound power level based on ISO 9614-2. The
results represent typical engine A-weighted sound power levels at engine full load and nominal
speed.
W31 Engine A-weighted Sound Power Level in Octave Frequency Band [dB, ref. 1pW] - Diesel Mode
Total8000400020001000500250125[Hz]
1251141161191211151101008V
12511411812111811510710010V
W31 Engine A-weighted Sound Power Level in Octave Frequency Band [dB, ref. 1pW] - Gas Mode
Total8000400020001000500250125[Hz]
12011011111211611211110310V
16.4 Exhaust noise
The results represent typical exhaust sound power level emitted from turbocharger outlet to
free field at engine full load and nominal speed.
Exhaust Gas Sound Power Level in Octave Frequency Band [dB, ref. 1pW]
Total4000200010005002501256332[Hz]
1501101131191241291341481468V
15011111511712513113414014910V
16-4 DBAE248994
Wärtsilä 31DF Product Guide16. Vibration and Noise
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