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Flexible dynamic modeling and vibration isolation performance of marine double-layer gearbox casings
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Jie YANG1, Ru-peng ZHU2, Wei-fang CHEN2, Guang-hao DAI3, Yan-jiong YUE3, Xun-min YIN3
Journal of Ship Mechanics | 2024, 28(2) : 309 - 318
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Journal of Ship Mechanics | 2024, 28(2): 309-318
• Hydro/Structural Acoustics •
Flexible dynamic modeling and vibration isolation performance of marine double-layer gearbox casings
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Jie YANG1, Ru-peng ZHU2, Wei-fang CHEN2, Guang-hao DAI3, Yan-jiong YUE3, Xun-min YIN3
Affiliations
  • 1.School of Aviation and Mechanical Engineering, Changzhou Institute of Technology, Changzhou 213032, China
  • 2.College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • 3.No.703 Research Institute of CSSC, Harbin 150078, China
Published: 2024-02-20 doi: 10.3969/j.issn.1007-7294.2024.02.013
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Double-layer gearbox casings can not only provide elastic support for the gear transmission system, but have a good performance in the reduction of vibration noise. To efficiently and accurately predict the control effect of the vibration noise for double-layer gearbox casings, the flexible dynamic condensation model of a marine double-layer gearbox casing with vibration isolators was established based on the modal synthesis method. The condensation model was verified by calculating the natural characteristics of the complete finite element model of the double-layer gearbox casing. The vibration isolation performance of the double-layer gearbox casing was evaluated by analyzing the modal decoupling rate, modal contribution, vibration level difference, and inner casing inclination of the established condensation model. The results show that the modal decoupling rate of the double-layer gearbox casing in the translation direction is above 94.9%. The modal contribution is mainly dominated by the second to sixth mode shapes. The maximum vibration level difference can reach 34.2 dB in the excitation frequency range of 1-6000 Hz. The excitation frequency has a significant effect on the variations of the vibration level difference and inner casing inclination when the excitation frequency is less than 2000 Hz.

double-layer gearbox  /  modal decoupling  /  vibration noise  /  modal contribution  /  vibration level difference
Jie YANG, Ru-peng ZHU, Wei-fang CHEN, Guang-hao DAI, Yan-jiong YUE, Xun-min YIN. Flexible dynamic modeling and vibration isolation performance of marine double-layer gearbox casings[J]. Journal of Ship Mechanics, 2024 , 28 (2) : 309 -318 . DOI: 10.3969/j.issn.1007-7294.2024.02.013
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Article Info
doi: 10.3969/j.issn.1007-7294.2024.02.013
  • Receive Date：2023-08-15
  • Online Date：2026-03-21
  • Published：2024-02-20
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  • Received：2023-08-15
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Affiliations
    1.School of Aviation and Mechanical Engineering, Changzhou Institute of Technology, Changzhou 213032, China
    2.College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
    3.No.703 Research Institute of CSSC, Harbin 150078, China
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https://castjournals.cast.org.cn/joweb/cblx/EN/10.3969/j.issn.1007-7294.2024.02.013
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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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