Wartsila ?31DF Series User Manual

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

Wartsila ?31DF Series Specifications

General

Brand	Wartsila
Model	?31DF Series
Category	Engine
Language	English