Torque Variations - Wartsila 31 Product Manual

15. Vibration and Noise
Table 15-2
Engine
8V31
10V31
12V31
14V31
16V31
15.2

Torque variations

Table 15-3
Engine
8V31
10V31
12V31
14V31
16V31
15.3 Mass moments of inertia
The mass-moments of inertia of the main engines (including flywheel) are typically as follows:
Engine
8V31
10V31
12V31
15.4 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.
15-2
External couples
Speed Freq.
M
Y
[RPM] [Hz]
[kNm] [kNm]
720 --- ---
750 --- ---
720 12 38
750 12,5 41
720 --- ---
750 --- ---
720 12 22
750 12,5 24
720 --- ---
750 --- ---
Torque variations
Speed Freq.
M
x
[RPM] [Hz]
[kNm]
720 24 25
750 25 19
720 24 25
750 25 27
720 36 24,46
750 37,5 23
720 42 8
750 44 8
720 48 28
750 50 28
2
J (kg m )
640 – 740
720 – 820
800 – 900
Freq.
M M M
Z Y
[Hz]
[kNm] [kNm]
--- --- ---
--- --- ---
38 24 ---
41 25 ---
--- --- ---
--- --- ---
22 24 35
24 25 38
--- --- ---
--- --- ---
Freq. Freq.
M M
x
[Hz] [Hz]
[kNm] [kNm]
48 14 72
50 14 75
30 82 60
31 82 63
72 47 108
75 47 112,5
84 38 126
88 38 131
96 24 144
100 24 150
Engine J (kg m
14V31 890 – 990
16V31 980 – 1080
Wärtsilä 31 Product Guide - a1 - 18 October 2016
Wärtsilä 31 Product Guide
Freq.
M M
Z Y
[Hz]
[kNm] [kNm]
--- --- --- ---
--- --- --- ---
--- 48 --- 0,2
--- 50 --- 0,2
--- --- --- ---
--- --- --- ---
20 48 1 3
21 50 1 4
--- --- --- ---
--- --- --- ---
Freq.
M
x x
[Hz]
[kNm]
31 -- --
31 -- --
41 90 21
41 94 21
8 144 1
8 150 1
1 168 1
1 175 1
1 192 1
1 200 1
2
)
Z