scope:

In these Guidance Notes, the following topics are discussed:

i) Source-Path-Receiver Modeling

ii) Results Evaluation

iii) Empirical Method

iv) SEA Method

The Source-Path-Receiver Modeling in Section 2 provides an overview of the modeling method of onboard noise analysis for ships and offshore units. It introduces methods for the modeling of the noise source, transmission path, and the receiver room.

The Results Evaluation in Section 3 provides the basic concepts of evaluating the results of the noise analyses. It introduces the concept of frequency band analysis and the most widely-used weighting method, A-weighting method, to consider the sensitivity of the human ear.

The Empirical Method in Appendix 1 provides the empirical formulae for the calculation of transmission attenuation from airborne sound, structure-borne sound, and duct-borne sound.

The SEA Method in Appendix 2 introduces the general concepts of SEA, which is a widely-used numerical method for onboard noise analysis for ships and offshore units.