16.2 Mass moments of inertiaThe mass-moments of inertia of the main engines (including flywheel) are typically as follows:J (kg m2)EngineJ (kg m2)Engine890 – 990980 – 108014V3116V31640 – 740720 – 820800 – 9008V3110V3112V3116.3 Air borne noiseThe airborne noise of an engine is measured as sound power level based on ISO 9614-2. Theresults represent typical engine A-weighted sound power levels at engine full load and nominalspeed.W31 Engine A-weighted Sound Power Level in Octave Frequency Band [dB, ref. 1pW] - Diesel ModeTotal8000400020001000500250125[Hz]1251141161191211151101008V12511411812111811510710010VW31 Engine A-weighted Sound Power Level in Octave Frequency Band [dB, ref. 1pW] - Gas ModeTotal8000400020001000500250125[Hz]12011011111211611211110310V16.4 Exhaust noiseThe results represent typical exhaust sound power level emitted from turbocharger outlet tofree field at engine full load and nominal speed.Exhaust Gas Sound Power Level in Octave Frequency Band [dB, ref. 1pW]Total4000200010005002501256332[Hz]1501101131191241291341481468V15011111511712513113414014910V16-4 DBAE248994Wärtsilä 31DF Product Guide16. Vibration and Noise
