This paper introduces a novel control strategy into the insulation space for liquid natural gas\ncarriers. The control strategy proposed can improve the effects of control for differential pressure and\nreduce the energy consumption of nitrogen. The method combines a nonlinear feedback technique\nwith a closed-loop gain shaping algorithm (CGSA). It is designed for the pressure control system\nwhich is vital for liquid natural gas carriers (LNGCs) in marine transportation. The control error\nis modulated using nonlinear function. The deviation signal is replaced with a nonlinear feedback\nsignal. Comparison experiments are conducted under different conditions to prove the effectiveness\nof this strategy. This paper compares three control strategies: a control strategy with nonlinear\nfeedback based on CGSA, a control strategy without nonlinear feedback based on CGSA, and a\ntwo-degree-of-freedom (DOF) control strategy. The simulation results show that this control strategy\nwith nonlinear feedback performs better than the other two. The average reduction of control input\nis about 38.8%. The effect of pressure control is satisfactory.
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