BS ISO 20233-1:2018
Current
The latest, up-to-date edition.
Ships and marine technology. Model test method for propeller cavitation noise evaluation in ship design Source level estimation
Hardcopy , PDF
English
28-02-2018
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Model test setup and conditions
5 Noise measurement instrumentation
6 Noise measurement procedure
7 Post processing and scaling
8 Uncertainty
Annex A (informative) - Wake extrapolation methods
Annex B (informative) - Uncertainty assessments
Bibliography
Defines a model test method for propeller cavitation noise evaluation in ship design.
| Committee |
SME/32
|
| DevelopmentNote |
Supersedes 16/30346489 DC. (03/2018)
|
| DocumentType |
Standard
|
| Pages |
22
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
This document specifies a model test method for propeller cavitation noise evaluation in ship design.
The procedure comprises reproduction of noise source, noise measurements, post processing and scaling. The target noise source is propeller cavitation. Thus, this document describes the test set-up and conditions to reproduce the cavitation patterns of the ship based on the similarity laws between the model and the ship. The propeller noise is measured at three stages. The measurement targets for each stage are propeller cavitation noise, background noise, and transmission loss. For the source level evaluations, corrections for the background noise and the transmission loss are applied to the measured propeller cavitation noise. Finally, the full-scale source levels are estimated from the model scale results using a scaling law.
| Standards | Relationship |
| ISO 20233-1:2018 | Identical |
| IEC 60565:2006 | Underwater acoustics - Hydrophones - Calibration in the frequency range 0,01 Hz to 1 MHz |
| ISO 17208-1:2016 | Underwater acoustics Quantities and procedures for description and measurement of underwater sound from ships Part 1: Requirements for precision measurements in deep water used for comparison purposes |
| IEC 61260:1995 | Electroacoustics - Octave-band and fractional-octave-band filters |
| ISO/IEC Guide 98-3:2008 | Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) |
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