由于卷绕系统是一个复杂的、非线性系统，收卷机的卷径时刻在变化，转动惯量也难以计算。张力调节器如采用传统的控制理论进行设计，不一定能获得很好的控制效果。
Because the rolling system is complicated, nonlinear, and its load is variable, if the tension controller is designed basing on the tradition control theory, we would not achieve good control effect.
由于卷绕系统是一个复杂的、非线性系统，收卷机的卷径时刻在变化，转动惯量也难以计算。张力调节器如采用传统的控制理论进行设计，不一定能获得很好的控制效果。
Because the rolling system is complicated, nonlinear, and its load is variable, if the tension controller is designed basing on the tradition control theory, we would not achieve good control effect.
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