Automatic regulation must be added owing to the unstable characteristics of the open loop secondary system.

由于二次调节的开环不稳定特性，必须为其设置自动调节系统。

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Magnetic bearing control system is an equipment involved electromagnetic, control theory, mechanical theory, rotor dynamics and other subjects of the complex non-linear open-loop unstable system.

磁轴承控制系统是一个涉及了电磁学、控制科学、机械科学以及转子动力学等多门学科的复杂非线性开环不稳定系统。

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Open-loop unstable system with time delay is difficult to control using routine control methods.

开环不稳定时滞系统是工业现场中常见的一类被控过程，这类系统控制难度高，控制精度难以保证。

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Open-loop unstable system with time delay is difficult to control using routine control methods.

开环不稳定时滞系统是工业现场中常见的一类被控过程，这类系统控制难度高，控制精度难以保证。

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