ISO/DIS 17208-3:2023 PDF

The ISO 17208 standards describe procedures for the measurement of underwater sound radiated by the ship under test, and for calculating sound source quantities such as source level and radiated noise level from the measurement results.

In 17208 Parts 1 to 3 it is presumed that the ship under test cooperates in the measurements, sailing multiple runs along a specified track along the measurement system at a specified speed with predetermined machinery configurations. Opportunistic measurements of the radiated sound of passing ships are outside the scope of these three standards.

Part 3 of the ISO 17208 standards (this document) specifies procedures for the measurement of underwater sound radiated by the ship under test in shallow water. It also specifies procedures for the calculation of source level from the sound pressure measurements, accounting for the relevant phenomena that govern the propagation of sound in shallow water. These calculations are described in Clause 7. Once the Source Level has been calculated, other metrics may be calculated from the source level and the source depth. Clause 7.4 provides a procedure for calculating the Radiated Noise Level that would have been measured in deep water according to ISO 17208-1 for the same ship in the same condition.