WÄRTSILÄ 46F Series, Product Manual

Page: 171 / 208

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 5 Main engine
ISO 8528-9 Generating set (not on a common 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]
Frequency
[Hz]
Speed
[rpm]
Engine
12.3 – 40 600 8L46F
– forces are zero or insignificant
Table 16-2 External couples
M
Z
[kNm]
M
Y
[kNm]
Frequency
[Hz]
M
Z
[kNm]
M
Y
[kNm]
Frequency
[Hz]
M
Z
[kNm]
M
Y
[kNm]
Frequency
[Hz]
Speed
[rpm]
Engine
– 12.4 40 – 1) 104.2 20 63 63 10 600 7L46F
– 11 40 – 163 20 30 30 10 600 9L46F
13 5 40 86 155 20 103 103 10 600 14V46F
13 5 40 86 155 20 – – 10 600 14V46F 2)
1) zero or insignificant value marked as "-"
2) balancing device adopted
DAAB605814 16-1
16. Vibration and Noise Wärtsilä 46F Product Guide