Tank-level robust control of LNG carrier based on hyperbolic tangent function nonlinear modification  

作　　者：Zongkuo Li Xianku Zhang Junpeng Huang 

机构地区：[1]Navigation College,Dalian Maritime University,Dalian 116026,China

出　　处：《Transportation Safety and Environment》2024年第4期68-74,共7页交通安全与环境(英文)

基　　金：supported by the National Science Foundation of China(Grant No.51679024);Dalian Innovation Team Support Plan in the Key Research Field(Grant No.2020RT08);Doctoral Research Initial Fund Project of Liaoning Province(Grant No.2021-BS-078);Dalian Maritime University University-level Team"Open Ranking"Project(Grant No.3132023502).

摘　　要：The objective of this study was to achieve a better control effect of the controller on the liquid level of the liquefied natural gas(LNG)carrier and to achieve the goal of energy saving and carbon reduction.This paper took the loaded square tank of an S175 highspeed container ship as the research plant,combined with the closed-loop gain-shaping algorithm(CGSA)and nonlinear modification technology to further optimize the controller.We initially employed a third-order CGSA approach in formulating the foundation of our linear controller.Subsequently,we introduced a non-linear modification to this controller by harnessing the power of the hyperbolic tangent function,and the control effect is verified by the MATLAB simulation experiment.Based on the outcomes of MATLAB simulations,by integrating the third-order CGSA technique and introducing non-linear modification through the hyperbolic tangent function,we observed a significant enhancement in the controller’s performance.Specifically,it outperformed the traditional PID controller by a substantial margin,demonstrating a remarkable 19%boost in control efficacy.Additionally,it provides better energy savings than the non-linear controller.The controller designed in this paper has a better control effect on the liquid tank-level control of LNG ships,the control process is more energy-saving and the purpose of carbon reduction is realized.

关 键 词：LNG carrier liquid level control third-order closed-loop gain-shaping algorithm nonlinear modification hyperbolic tangent function energy saving carbon reduction 

分 类 号：O17[理学—数学]