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Anti-pitch control of very large ships based on dual nonlinear feedback under severe sea conditions
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Chunyu SONG, Qi QIAO, Jianghua SUI
Navigation of China | 2025, 48(4) : 152 - 159
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Navigation of China | 2025, 48(4): 152-159
• Intelligent Shipping •
Anti-pitch control of very large ships based on dual nonlinear feedback under severe sea conditions
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Chunyu SONG, Qi QIAO, Jianghua SUI
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  • Navigation and Engineering College, Dalian Ocean University, Dalian 116023, China
Published: 2025-12-25 doi: 10.3969/j.issn.1000-4653.2025.04.017
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To study the pitching stabilization performance of super-large ships under severe sea conditions, this paper takes the tanker "KVLCC2" as the research object. A weighting matrix is utilized to stabilize its transfer function model in Mathematica, and the stability of the model is verified using the root trajectory shaping method. Subsequently, a simplified first-order closed-loop gain-shaping algorithm is applied to design the robust controller. In addition, a dual nonlinear feedback control algorithm is proposed to be incorporated into the control system to further enhance its pitching stabilization performance. To validate the effectiveness of the dual nonlinear feedback control system for pitching stabilization, wind scale of 7 and 8 wind and wave models along with perturbation links are introduced into the system for simulation experiments. The experimental results demonstrate that even with a time lag constant of 0.15, the dual nonlinear feedback control system effectively improves the ship's pitching stabilization performance under rough sea conditions. The proposed dual nonlinear feedback control system can provide technical support for the smooth and efficient navigation of super-large ships in varying sea conditions.

rough sea conditions  /  super large vessels  /  dual nonlinear feedback  /  closed-loop gain shaping algorithm  /  pitching stabilization control
Chunyu SONG, Qi QIAO, Jianghua SUI. Anti-pitch control of very large ships based on dual nonlinear feedback under severe sea conditions[J]. Navigation of China, 2025 , 48 (4) : 152 -159 . DOI: 10.3969/j.issn.1000-4653.2025.04.017
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Year 2025 volume 48 Issue 4
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Article Info
doi: 10.3969/j.issn.1000-4653.2025.04.017
  • Receive Date：2024-11-21
  • Online Date：2026-03-17
  • Published：2025-12-25
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  • Received：2024-11-21
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    Navigation and Engineering College, Dalian Ocean University, Dalian 116023, 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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