Based on cascade control strategy and nonlinear auto-disturbance-rejection control (ADRC) method, double loop (position loop and current loop) ADRC was designed for single-pivot levitation system.

双环(位置环和电流环)自抗扰控制器的设计，以单点悬浮系统为研究对象，采用分级控制策略和非线性自抗扰控制方法。

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A newly rectification auto-cascade refrigeration system is proposed, and its working principle is also analyzed.

提出了一种具有精馏装置的新型自动复叠制冷循环，并从理论角度对其机理给予分析。

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