Section 3 Vibration
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Naval Ships, January 2023 - Volume 3 Additional Class Notations - Part 2 Naval Ship Safety - Chapter 7 Noise and Vibration Levels in Personnel Spaces - Section 3 Vibration

Section 3 Vibration

Parent topic: Chapter 7 Noise and Vibration Levels in Personnel Spaces

3.1 Maximum vibration levels

3.1.1 The vibration parameters are defined in the standard ISO 20283-5 as the overall frequency weighted r.m.s. value of deck structure vibration during a period of steady-state operation over the frequency range 1 to 80 Hz.

3.1.2 Vibrations in the vertical and horizontal directions are to be assessed separately.

3.1.3 When the ship is proceeding in its agreed operating condition and in accordance with the provisions specified in Vol 3, Pt 2, Ch 7, 4.2 Test conditions, the vibration levels specified in Table 7.3.1 Accommodation - maximum vibration levels and Table 7.3.2 Work areas - maximum vibration levels are not to be exceeded.

3.1.4 The vibration levels should preferably be predicted at design stage (optional) using finite element calculation methods and should as a minimum include vibrations generated by the propulsion system, main engines and auxiliary generators. The predictions should be presented to LR for information.

Table 7.3.1 Accommodation - maximum vibration levels

Location NS1 and NS(SR) vessels NS2, NS3 and NS(SSC) vessels
Frequency weighted velocity level (1–80 Hz), mm/s r.m.s.
Comfort Level
1 2 1 2
Sleeping cabins,medical areas, recreation areas, offices, conference rooms (see Note 1) 3 3,5 3 4,5
Mess rooms 3,5 4,5 4,5 5
Open-deck recreation areas 3,5 4,5 4,5 5
Passageways within accommodation areas,changing rooms, communal washrooms 3,5 4,5 4,5 5
Note 1. In medical areas the Owner may have specific vibration limits which are determined by the medial equipment being used. Such limits are to be declared in the test plan.

Table 7.3.2 Work areas - maximum vibration levels

Location NS1 and NS(SR) Vessels NS2, NS3 and NS(SSC) Vessels
Frequency weighted velocity level (1–80 Hz), mm/s r.m.s.
Comfort Level
1 2 1 2
Machinery spaces (e.g. engine room, pump room, refrigeration space, thruster space or fan room) 5 5,5 5,5 6,5
Workshops, hangars, passageways within work areas, stairwells,non-specified work spaces and open deck work spaces 5 5,5 5,5 6,5
Machinery control rooms 4 5 5 5,5
Bridge, chart rooms, conning positions, operational control rooms, and radar rooms 4 5 5 5,5
Look-out posts, e.g. at bridge wing or window 4 5 5 5,5
Communication compartments 5 5 5 5,5
Laundries, galleys and pantries 5 5,5 5,5 6,5
Normally unoccupied spaces (e.g. stores, magazines, holds, decks) 5 5,5 5,5 6,5
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