GB/T 41890.1-2022Ships and marine technology - Model test method for propeller cavitation noise evaluation in ship design - Part 1: Source level estimation (English PDF)
船舶与海上技术 船舶设计过程中螺旋桨空化噪声模型试验方法 第1部分：声源级评估
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
October 12, 2022
Implementation date
October 12, 2022
Scope
GB/T 41890.1-2022 is the English-translated version of 船舶与海上技术 船舶设计过程中螺旋桨空化噪声模型试验方法 第1部分：声源级评估.
GB/T 41890.1-2022 is the Chinese standard "Ships and marine technology - Model test method for propeller cavitation noise evaluation in ship design - Part 1: Source level estimation".
Its scope clause reads: This document describes a model test method for sound source level assessment of propeller cavitation noise during ship design. The experimental process includes simulation of noise sources, noise measurement, data post-processing and real-scale forecasting.
The target noise source for this test is the propeller Cavitation noise. Therefore, this document details the simulation of ship propeller cavitation noise characteristics based on similar principles between model and real ships. test preparation and conditions.
The propeller noise measurement is divided into three stages. propeller cavitation noise measurement, background noise measurement and real-scale prediction.
In order to evaluate the sound source level of cavitation noise more accurately, it is necessary to correct the signal-to-noise ratio and sound field environment of the propeller cavitation noise measured by the test.
Finally, according to the similar relationship between the model and the real ship, the sound source level of the propeller cavitation noise of the prototype ship is predicted.
This document applies to the sound source level assessment of propeller cavitation noise during ship design. Its clauses include terms and definitions.
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Document preview — GB/T 41890.1-2022
National Standard of the People's Republic of China
- ICS
- 47.020.20
- Classification
- U 40
Issued by: State Administration for Market Regulation, China National Standardization Administration
Contents
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 3.1 acousticcentre
- 3.2 background noise
- 3.3 cavitationnumber
1 Scope
This document describes a model test method for sound source level assessment of propeller cavitation noise during ship design.
The experimental process includes simulation of noise sources, noise measurement, data post-processing and real-scale forecasting. The target noise source for this test is the propeller
Cavitation noise. Therefore, this document details the simulation of ship propeller cavitation noise characteristics based on similar principles between model and real ships.
test preparation and conditions. The propeller noise measurement is divided into three stages. propeller cavitation noise measurement, background noise measurement and real-scale prediction.
In order to evaluate the sound source level of cavitation noise more accurately, it is necessary to correct the signal-to-noise ratio and sound field environment of the propeller cavitation noise measured by the test.
Finally, according to the similar relationship between the model and the real ship, the sound source level of the propeller cavitation noise of the prototype ship is predicted.
This document applies to the sound source level assessment of propeller cavitation noise during ship design.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.
GB/T 41311.1-2022 Acoustic description of the amount of underwater noise from ships and its measurement methods - Part 1.For comparison purposes
Deep water precision measurement requirements (ISO 17208-1.2016, IDT)
IEC 61260 Electroacoustic Octave and Band Band Filters (Electroacoustics-Octave-bandandfractional-
Note. GB/T 3241-2010 Electroacoustic Octave and Fractional Octave Filters (IEC 61260.1995, MOD)
ITTC Recommended Procedures and Guidelines 7.5-02-01-05 Model Scale for Propeller Cavitation Noise Measurements (Recommended
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1 acousticcentre
All noise sources are equivalent to the center of a point source.
Note. The acoustic center is the equivalent sound source center of the expected cavitation noise.
3.2 background noise
All noise other than the test noise source.
3.3 cavitationnumber
sigman
A dimensionless number defined by the following formula.
GB/T 37452 | CB/T 4197 | GB/T 11865 | GB/T 41894.3 | GB/T 41894.2 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 30 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 41311.1-2022Acoustics - 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
- GB/T 3241-2010Electroacoustics - Octave-band and fractional-octave-band filters - Part 1: Specifications
ISO 17208 · IEC 61260 · IEC 61260.1995
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Related Standards
GB/T 3241-2010 — Electroacoustics - Octave-band and fractional-octave-band filters - Part 1: Specifications
GB/T 41311.1-2022 — 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
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