Wartsila 46DF - Vibration and Noise

16. Vibration and Noise
Resiliently mounted engines comply with the requirements of the following standards regarding
vibration level on the engine:
ISO 10816-6 Class 5Main engine
ISO 8528-9Generating set (not on a com-
mon base frame)
16.1 External forces and couples
Some cylinder configurations produce dynamic 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]
Fre-
quency
[Hz]
Speed
[rpm]
Engine
12.3–406008L46DF
– forces are zero or insignificant
Table 16-2 External couples
M
Z
[kNm]
M
Y
[kNm]
Fre-
quency
[Hz]
M
Z
[kNm]
M
Y
[kNm]
Fre-
quency
[Hz]
M
Z
[kNm]
M
Y
[kNm]
Fre-
quency
[Hz]
Speed
[rpm]
Engine
–12.440–
1)
104.2206363106007L46DF
DBAD209883 16-1
16. Vibration and NoiseWärtsilä 46DF Product Guide