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Irregular frequency problem of vibroacoustic simulation of a shaft-hull system
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Jia-xi DUAN1, 2, Lin ZHANG1, 2, Xue-hai SUN1, 2, Li-jun YIN1, 2, Liang-long DA1, 2
Journal of Ship Mechanics | 2024, 28(10) : 1611 - 1621
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Journal of Ship Mechanics | 2024, 28(10): 1611-1621
• Hydro/Structural Acoustics •
Irregular frequency problem of vibroacoustic simulation of a shaft-hull system
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Jia-xi DUAN1, 2, Lin ZHANG1, 2, Xue-hai SUN1, 2, Li-jun YIN1, 2, Liang-long DA1, 2
Affiliations
  • 1.Department of Navigation Observation Communication, Naval Submarine Academy, Qingdao 266199, China
  • 2.Qingdao Marine Science and Technology Center, Qingdao 266237, China
Published: 2024-10-20 doi: 10.3969/j.issn.1007-7294.2024.10.013
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If the fluid-structure interaction problem in frequency domain is solved by boundary element method, irregular frequencies will appear at the resonant frequencies of virtual interior fluid domain and exhibit large fluctuation. In order to investigate the underwater acoustic radiation properties of a full-scale submarine, a shaft-hull coupled system was established based on Suboff model. The FE/BE method was adopted to calculate the vibroacoustic radiation of the system in low- and medium-frequency. The closed virtual impedance surface (CVIS) method was respectively used and not used to study the influence of irregular frequencies. It is shown that: (1) for slender submarine hull with complicated shape, irregular frequencies are not only negligible, but even exhibit in continuous irregular bands; (2) enormous errors will occur if irregular frequencies are not eliminated, and convergence zones in far field of deep ocean environment are also“contaminated”; (3) for submarine whose the main body is constructed as slender cylindrical shell, the 1st irregular frequency can be obtained according to the analytical expression of the irregular frequencies of slender cylindrical shell, and the non-dimensional 1st irregular frequency is about ka=2.4.

boundary element method  /  vibroacoustic radiation  /  irregular frequency  /  convergence zone
Jia-xi DUAN, Lin ZHANG, Xue-hai SUN, Li-jun YIN, Liang-long DA. Irregular frequency problem of vibroacoustic simulation of a shaft-hull system[J]. Journal of Ship Mechanics, 2024 , 28 (10) : 1611 -1621 . DOI: 10.3969/j.issn.1007-7294.2024.10.013
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Year 2024 volume 28 Issue 10
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Article Info
doi: 10.3969/j.issn.1007-7294.2024.10.013
  • Receive Date：2024-04-17
  • Online Date：2026-03-26
  • Published：2024-10-20
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  • Received：2024-04-17
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Affiliations
    1.Department of Navigation Observation Communication, Naval Submarine Academy, Qingdao 266199, China
    2.Qingdao Marine Science and Technology Center, Qingdao 266237, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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