Table 16-2
External couples
MZ [kNm]
Frequency [Hz]
MY [kNm]
Frequency [Hz]
Speed [rpm]
Engine
7
15
7
4.8
0.4
15
30
60
900
W 9L20
8.6
16.7
8.6
5.9
0.5
16.7
33.3
66.7
1000
M
Z
= 0, M
Y
= 0 for 4, 6 and 8 cylinder engines
16.2
Torque variations
Table 16-3
Rolling moments at 100% load
M
X
[kNm]
Frequency [Hz]
M
X
[kNm]
Frequency [Hz]
M
X
[kNm]
Frequency [Hz]
Speed
[rpm]
Engine
3.5
3.5
90
100
9.8
9.6
60
66.7
9.9
6.6
30
33.3
900
1000
W 4L20
0.4
0.4
135
200
5.2
5.2
90
100
15.4
13.4
45
50
900
1000
W 6L20
0.5
0.5
180
200
1.5
1.5
120
133
19.6
19.3
60
66.7
900
1000
W 8L20
0.4
0.4
203
225
0.6
0.7
135
150
17.8
17.7
67.5
75
900
1000
W 9L20
Table 16-4
Rolling moments at 0 % load
M
X
[kNm]
Frequency [Hz]
M
X
[kNm]
Frequency [Hz]
M
X
[kNm]
Frequency [Hz]
Speed
[rpm]
Engine
0.9
0.9
90
100
1.4
1.3
60
66.7
10
13
30
33.3
900
1000
W 4L20
0.4
0.4
135
150
1.3
1.3
90
100
4.7
6.8
45
50
900
1000
W 6L20
-
-
-
-
0.7
0.7
120
133
2.8
2.6
60
66.7
900
1000
W 8L20
-
-
-
-
0.5
0.5
135
150
3.6
3.6
67.5
75
900
1000
W 9L20
16.3
Mass moments of inertia
The mass-moments of inertia of the propulsion engines (including flywheel, coupling outer
part and damper) are typically as follows:
J [kgm²]
Engine
90...120
W 4L20
90...150
W 6L20
110...160
W 8L20
100...170
W 9L20
16-2
Wärtsilä 20 Product Guide - a13 - 6 September 2016
Wärtsilä 20 Product Guide
16. Vibration and Noise
Содержание WARTSILA 20
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