一旦出现非线性和时变性，经典技术最根本的基础就不复存在了。
When nonlinearities and time variations are present, the very basic for these classical techniques is removed.
对于非线性和时变性的不确定系统，模糊控制是一种较有效的方法。
Fuzzy control has been proven to be effective in complex, time-varying and uncertain control systems.
浆纱机经纱退绕张力控制系统缺乏精确的数学模型，且具有非线性和时变性的特点。
Warp unwinding tension control system for sizing machine lacks an precise mathematical model, and has nonlinear and time-varying Characteristics.
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