The dynamic positioning system is a closed loop control system which resists against the disturbance by wind, wave, and current with the help of thrusters on the vessel.

动力定位系统是一种闭环控制系统，采用推力器来提供抵抗风、浪、流等作用在船上的环境力，从而尽可能使船舶保持在海平面要求的位置上。

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Provides a way to simulate waves in real-time according to random-wave-spectrum. It can be used to study the performances of dynamic positioning ship and control system under different waves.

提出一种根据随机海浪频谱来实时模拟随机海浪的方法，它可以用于研究动力定位船舶及其控制系统在不同海况时的性能。

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And the static and dynamic systems of Servo system affect positioning speed, positioning accuracy and machining accuracy of numerical control machine tool directly.

而伺服系统的静态、动态性能直接关系数控机床的定位速度、定位精度和加工精度。

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