Marine Predator Algorithm-based Sliding Mode Control of a Novel Motion Simulator for High Column Sloshing Experiments

Sloshing experiment is crucial to determine the reaction performance of regeneration columns on an offshore floating platform.A novel type of column motion simulating device and a Marine Predator Algorithm-based Sliding Mode Controller(MPA-SMC)are proposed for such sloshing experiments.The simulator consists of a Stewart platform and a steel framework.The Stewart platform is located at the column's center of gravity(CoG)and supported by the steel framework.The platform's hydraulic servo system is controlled by a sliding mode controller with parameters optimized by MPA to improve robustness and precision.A numerical sloshing experiment is conducted using the proposed device and controller.The results show that the novel motion simulator has lower torque during the column sloshes,and the proposed controller performs better than a well-tuned PID controller in terms of target tracking precision and anti-interference capability.

鸭绿沙塘鳢耳石质量与年龄的关系

2018年8月至2020年10月,在鸭绿江支流、太子河与碧流河采集鸭绿沙塘鳢(Odontobutis yaluens)共472尾,成功鉴定年龄并称取457个耳石样本。年龄鉴定结果显示:鸭绿沙塘鳢种群年龄结构简单,最小为1龄,最大为4龄,2~3龄居多。通过回归拟合耳石质量与体长、年龄之间的关系,得到鸭绿沙塘鳢耳石质量与年龄之间的函数关系式,据此可利用耳石质量推断鸭绿沙塘鳢年龄。