双闭环转速控制系统超调小、过渡时间短，性能要好于单闭环系统。

Double closed loop system has a little overshoot and short transition time, whose performance is better than single closed loop system.

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仿真结果表明，通过实施优化控制，能够使产品牌号切换过程的过渡时间和过渡料数量降低60％以上。

Simulation results show that through implementation of optimal control, the transition time and off-spec product can be reduced over 60% in the polypropylene grade transition.

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基于部分反馈线性化与LQR方法结合的控制策略摇起时间短，控制器之间过渡平稳，但它有成功率不高、参数难调的缺点。

To solve the problems in pendubot strategy based on partial feedback linearization and LQR, another control strategy based on fuzzy control and LQR is proposed.

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