The anti - rolling tanks have three types including passive anti - rolling , controlled passively anti - rolling tank and active anti - rolling tank . the controlled passively anti - rolling tank has high performance , and it can adjust the water oscillation period through the valves in the upper of side tank in order to adapt the roll period . thus the controlled passively anti - rolling has favorable effect in the any states 其中，可控被动式减摇水舱是一种高效能的减摇水舱，它可以通过自动控制系统调节边舱顶部的气阀开关来调节水舱内水流振荡周期，以适应经常变化的横摇周期，保证在任何海浪作用下水舱都具有良好的减摇效果。
