Marine Installation Manual
2021-08
7-8
7 Engine Emissions
7.2 Engine noise
X72DF
7.2.3
Structure-borne noise
The vibrational energy is propagated via engine structure, bedplate flanges and
engine foundation to the ship’s structure, which starts to vibrate and thus emits
noise.
The sound pressure levels in the accommodations can be estimated with the aid
of standard empirical formulas and the vibration velocity levels.
Figure 7
-
7 Structure-borne noise level at engine feet vertical
SM-0143
31.5
63
125
250
500
1k
2k
4k
8k
100
90
80
70
60
50
40
30
Octave band centre frequency in [Hz]
16k
Lv, re 5E-8 m/s [d/B]
Structure borne noise level Lv in dB at nominal MCR
8X72DF
5X72DF
