Comparative analysis of ship model hydrodynamic noise and hole cavity excitation load tests and calculation

QI Qiongfang1,2, DENG Haihua1, MIAO Tiancheng1, GU Yu3, SHI Xiaoyong3

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (15) : 288-293.

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PDF(1977 KB)
Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (15) : 288-293.

Comparative analysis of ship model hydrodynamic noise and hole cavity excitation load tests and calculation

  • QI Qiongfang1,2, DENG Haihua1, MIAO Tiancheng1, GU Yu3, SHI Xiaoyong3
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Abstract

The underwater noise test was conducted of a bare vessel model of a certain ocean going passenger, and the hydrodynamic exciting load was tested of the vessel model with a cavity. Steady sate and transient flow was calculated in the cavity. The calculation curve of the pulsating pressure spectrum at the cavity is in good agreement with the experimental curve, and the comparison of pulsating pressure spectrum in the cavity between the frequency test value with empirical formula is in good, indicating that the formula is suitable for estimating the spectral frequency of the grid cavity under certain conditions. Statistical Energy Analysis method was employed to calculate the flow induced noise in medium-high frequency of a bare vessel model. and the application of fluid excitation of power spectrum in frequency -wave number form, could greatly reduce the workload of flow calculation and is suitable for rapid engineering estimation. Within the general scope of engineering, the value of damping loss factor could lead to a difference of 5.5 dB in noise results, indicating that the value of damping loss factor will greatly affect the calculation results. It is necessary to form a database of material loss factor with frequency to provide support for ship noise calculation.

Key words

vessel model / power spectrum in frequency and wave number / peak frequency of cavity / flow-induced noise / SEA

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QI Qiongfang1,2, DENG Haihua1, MIAO Tiancheng1, GU Yu3, SHI Xiaoyong3. Comparative analysis of ship model hydrodynamic noise and hole cavity excitation load tests and calculation[J]. Journal of Vibration and Shock, 2024, 43(15): 288-293

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