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Robust Control of Pressure for LNG Carrier Cargo Handling System via Mirror-Mapping Approach

机译：镜像映射方法对液化天然气运输货物装卸系统的压力进行鲁棒控制

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The pressure control for a liquid nature gas (LNG) ship is vital for the cargo handling system which is a nonlinear, unstable, and controllable complex system accompanied by the dynamics of time delay. To improve the control effect, this article proposed a robust controller based on closed-loop gain shaping algorithm by mirror-mapping approach. In addition, the complete mechanism models for the system are established to predict the changes of temperature, pressure, and liquid inventory in the cargo tank. The heat exchanges and evaporation of liquid are also considered. By collecting the data from the LNG ship “Dapeng,” the system models are validated. At the same time, the comparative experiment is introduced to verify the reliability and effectiveness. The scheme has been compared with the 2-DOF structure control law of modified Smith predictor. The comparative experimental results show that the scheme proposed in this note has a strong disturbance rejection ability and steady-state performance. The controller designed in this note has advantages of simplified construction method, satisfactory control effect and robustness.
机译：液化天然气（LNG）船的压力控制对于货物装卸系统至关重要，该装卸系统是一个非线性，不稳定且可控制的复杂系统，具有动态的时延。为了提高控制效果，本文提出了一种基于闭环增益整形算法的镜像映射鲁棒控制器。此外，建立了系统的完整机制模型，以预测货油舱中的温度，压力和液体存量的变化。还考虑了液体的热交换和蒸发。通过从液化天然气船“大鹏”收集数据，可以验证系统模型。同时，引入对比实验以验证其可靠性和有效性。将该方案与改进的Smith预估器的2自由度结构控制律进行了比较。对比实验结果表明，本文提出的方案具有很强的抗干扰能力和稳态性能。本说明中设计的控制器具有简化构造方法，令人满意的控制效果和鲁棒性的优点。

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