GB/T 39479-2020 in English
VALIDPrediction method for radiated noise of offshore platform
- Issued on:2020-12-14
- Implemented on:2021-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$185.00
《GB/T 39479-2020海洋平台辐射噪声预报方法》由TC12（全国海洋船标准化技术委员会）归口，TC12SC7（全国海洋船标准化技术委员会船舶理论与实验分会）执行，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
This standard systematically specifies the classification system, calculation method and implementation process of the radiated noise of marine platforms. The main technical features are as follows:
Noise classification system
| Classification dimensions | Air radiated noise | Underwater radiated noise |
|---|---|---|
| Propagation medium | Air/structure transmission | Water medium transmission |
| Main sources | Power system, ventilation system, etc. | Mechanical noise, thruster noise, etc. |
| Typical frequency | 20Hz-20kHz | 10Hz-100kHz |
Comparison of calculation methods
Empirical formula method
Applicable to the conceptual design stage, based on the fitting formula provided by China Classification Society's "Guidelines for Noise Control and Detection of Ships and Products". Typical cases include:
- Noise prediction error of the main engine room of a semi-submersible platform ≤3dB
- FPSO living area noise rapid assessment
Numerical calculation method
| Method | Applicable frequency band | Grid requirements | Typical Applications |
|---|---|---|---|
| Finite Element Method | Low Frequency (＜500Hz) | λ/5 Mesh Density | Platform Structure Vibration Analysis |
| Statistical Energy Method | High Frequency (＞1kHz) | Mode Number ≥5 | Cabin Noise Forecast |
| Boundary Element Method | Medium and Low Frequency | Surface Discretization | Underwater Noise Radiation |
Technology Evolution Analysis
This standard systematically integrates the EfowcsWilliams-Hawkings equation and large eddy simulation solves the limitations of traditional methods in thruster noise prediction. Compared with early industry practices, the main progress is reflected in:
- Established a complete frequency band coverage solution (20Hz-100kHz)
- Introduced hybrid modeling technology to improve mid-frequency band accuracy
- Standardized the setting of fluid-structure interaction boundary conditions
Implementation suggestions
Data preparation phase
- Prioritize the acquisition of vibration and noise spectrum data provided by equipment manufacturers
- When there is no measured data, refer to the typical spectrum library in Appendix C of the CCS Guidelines
Model construction phase
- The low-frequency model must include the complete platform structure
- The high-frequency model at least covers the excitation source-target area
- Pay special attention to the mesh refinement of the propeller D×D area
Result verification
- Compare with the measured data of the prototype platform
- Carry out grid sensitivity analysis
- Check the energy conservation error (recommended <5%)
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