The coal pulverizing system equipped with ball mills is a nonlinear, long delay, and closedcoupling multivariable system, its automatic control being a research hot spot all along.
钢球磨煤机制粉系统是一个非线性、大滞后、强耦合的多变量系统，其自动控制一直是热控领域的研究热点。
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In those coupling states, the load change command from temperature controller is by-passed, and the air and fuel flows change very slowly because of the nature of the closedcoupling system.
As a new type magnetic transmission mechanism, Non-contact Permanent Magnetic Gear has special function that can transmit torque and power to closed area by magnetic field coupling.