DNV GL SHIP TECHNOLOGY I-1-23 PDF

1. In general, these Rules are based on national and international standards listed in Annex A. They will be adapted to the latest editions of these standards when deemed necessary or will be modified to account for the progress of knowledge. The Rules reflect the state of the art in vibration and acoustic technology.

2. Some important definitions for expressions used in these Rules are given in Annex B.

3. Various comfort-promoting factors like furniture and size of cabins, the indoor climate, ship motions as well as the noise and vibration level decide on the well-being of the crew and officers. In these Rules only noise and vibration is dealt with.

4. In this context, noise and vibration are defined as follows:

Noise Audible air pressure variations in the range of 16 Hz to 16 kHz

Vibration Structural oscillations in the frequency range of 1 to 80 Hz

5. The influence of ship motions on human wellbeing (seasickness) is not considered in these Rules.

6. These Rules are intended to support owners and shipyards to specify requirements regarding the comfort of the crew on board seagoing cargo vessels.

7. Requirements according to current regulations of the responsible flag state regarding maximum noise and vibration levels in crew spaces are to be fulfilled independently of these Rules.

8. If the length between perpendiculars is less than 80 m, limit values given in these Rules do not apply. They shall be agreed upon separately after conferring with Germanischer Lloyd (GL).

9. The Rules do not give special requirements for vessels with additional passenger cabins, but a reasonable comfort level for this case is indicated.

10. To reflect the different situation of small and large cargo vessels with regard to noise and vibration the limit values distinguish between an aft and a more forward deck house position.