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16.
Vibration and Noise
Wärtsilä 34DF generating sets comply with vibration levels according to ISO 8528-9. Main
engines comply with vibration levels according to ISO 10816-6 Class 5.
16.1
External forces and couples
Some cylinder configurations produce external forces and couples. These are listed in the
tables below.
The ship designer should avoid natural frequencies of decks, bulkheads and superstructures
close to the excitation frequencies. The double bottom should be stiff enough to avoid
resonances especially with the rolling frequencies.
Fig 16-1
Coordinate system
Table 16-1
External forces
F
Z
[kN]
F
Y
[kN]
Frequency
[Hz]
F
Z
[kN]
F
Y
[kN]
Frequency
[Hz]
F
Z
[kN]
F
Y
[kN]
Frequency
[Hz]
Speed
[rpm]
kW /
cyl
Engine
–
–
–
–
48
50
–
–
–
–
24
25
–
–
–
–
12
12.5
720
750
500
W 6L34DF
–
–
–
–
–
–
–
–
–
–
–
–
5
5
–
–
48
50
720
750
500
W 8L34DF
–
–
–
–
48
50
–
–
–
–
24
25
–
–
–
–
12
12.5
720
750
500
W 9L34DF
–
–
–
–
48
50
–
–
–
–
24
25
–
–
–
–
12
12.5
720
750
500
W 12V34DF
–
–
–
–
144
–
–
–
–
–
96
–
3
3
4
4
48
50
720
750
500
W 16V34DF
– couples are zero or insignificant.
Wärtsilä 34DF Product Guide - a16 - 23 September 2016
16-1
16. Vibration and Noise
Wärtsilä 34DF Product Guide
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