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.
水轮机调节系统具有非线性和时变性的特性，传统的PID控制器无法获得高性能的调速系统。
With the nonlinear and time variable characteristics of hydraulic turbine regulation system, high qualified speed adjustment system cannot be achieved with the conventional PID controller.
针对焦炉温度的大惯性、纯滞后、非线性和时变性等特点，提出了一种新的模糊复合控制方法。
Aiming at the coke oven temperature characteristics of great inertia, pure time-delay, non-linear and time changeable, a fuzzy compound control method is proposed.
超声波电机是一种新型的电机，它有许多电磁电机无法比拟的优点，但它的数学模型的强非线性和时变性，使高精度的位置定位非常困难。
Ultrasonic Motor (USM) has excellent performance and many useful features, however, its mathematical model has strong non-linearity and time-variety to make precise position servo very difficult.
考虑到发动机怠速工作过程的非线性、时变性和不确定性，研究了模糊控制理论在发动机怠速控制中的应用。
By taking account of nonlinearity, time variation and unsteadiness of idling process in engines, this paper studies the application of fuzzy control theory in the idling speed control.
在各种扰动作用下，过热蒸汽温度动态特性具有大迟延、大惯性、时变性和非线性的特点。
With the effects of those, the dynamic characteristics of the SST have the features of large delay, great inertia, time-varying and non-linearity.
高频波段海洋回波信号表现了非线性和频谱时变性。
HF radar backscatter from the ocean surface shows nonlinearities and time variation of its spectrum.
其主要表现在：系统越来越复杂、存在非线性、时变性和不确定性，从而对控制系统的各种性能要求越来越高。
The problems summarized as below: it is a nonlinear and time-variation system with uncertainties, and it is more complex. So the high performance of this control system is required.
由于风速的随机性、风电机组参数的时变性和系统的非线性，以及系统的复杂性引起的时滞性，造成风电机组输出功率的不稳定。
Owing to the stochastic nature of wind speed, time-variable of parameters, system lagging and system nonlinearities the power generated by wind turbines changes rapidly.
电石炉是一个具有较强非线性、时变性和强耦合的被控对象。
Because it is a complicated object with serious non-linearity, time changing, strong couple, the Calcium Carbide furnace is difficult to establish the control model.
然而在实际控制系统中，被控对象往往具有非线性、时变性和不确定性，因此，关于非线性预测控制的研究已成为控制工程界的重要研究课题。
However, most processes in industry are nonlinear, time-variant and bear uncertainty, thus research on nonlinear predictive control has become an important issue in control field.
然而在实际控制系统中，被控对象往往具有非线性、时变性和不确定性，因此，关于非线性预测控制的研究已成为控制工程界的重要研究课题。
However, most processes in industry are nonlinear, time-variant and bear uncertainty, thus research on nonlinear predictive control has become an important issue in control field.
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