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Wärtsilä 31DF Product Guide
16.
Vibration and Noise
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 & 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
Table 16-1 External forces
Engine
8V31DF
10V31DF
12V31DF
14V31DF
16V31DF
DBAE248994
External forces, couples, variations
Speed
Freq.
F
Y
[RPM]
[Hz]
[kN]
720
24
---
750
25
---
720
---
---
750
---
---
720
---
---
750
---
---
720
48
4
750
50
5
720
---
---
750
---
---
Freq.
F
F
Z
Y
[Hz]
[kN]
[kN]
[kN]
---
48
2
---
50
2
---
---
---
---
---
---
---
---
---
---
---
---
2
---
---
2
---
---
---
---
---
---
---
---
16. Vibration and Noise
Freq.
F
F
F
Z
Y
[Hz]
[kN]
[kN]
1
---
---
---
1
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
Z
16-1
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