扰动

Induction heating furnace is a complex delay system.Exact mathematical model is not easy to be established.

感应加热炉是一个复杂的非线性大滞后系统，很难建立一个精确的数学模型，用常规的控制方法难以得到满意的效果，而且人工调试比较困难，在扰动比较大的时候，就会远离设定值。

Because of the universal existence of parameter perturbation and the fault ineluctability for actuator and sensor, it is more important and practical to study robust fault-tolerant control of parameter perturbation for linear system with time-delay.

由于参数扰动的广泛存在性以及执行器和传感器发生故障的不可避免性，使得研究具有参数不确定的时滞系统的鲁棒容错控制问题具有更重要的现实意义。

Design method of the electromechanical actuator controller based on the robust mixed H2/H* control theory is studied, taking advantage of the priority of the linear matrix inequation in solving the problems of the multiobject control, the robust mixed H2/H* control problem of the electromechanical actuator under the condition of parameter perturbation and external disturbance can be transformed to the solving of the linear matrix inequation.

研究了基于鲁棒H_2／H_∞混合控制理论的电动舵机的控制器设计方法，利用线性矩阵不等式在多目标综合控制问题求解方面的优势，将存在参数摄动及外部扰动时的电动舵机的鲁棒H_2／H_∞混合控制问题转化为线性矩阵不等式问西北工业大学博士学位论文题并进行求解。

2The infectant of vegetable surface can be cleaned out effectively by cavitation erosion which produced when air bubbles collapse and complex turbulencewhich caused by air flow.

气泡溃灭时产生的气蚀和气流引起水的翻滚、漩涡等复杂的扰动能有效的清除蔬菜表面的污染物。

This dissertation studies perturbation bounds of infinite dimensional operatorsand operator equations.We obtained the following main results.

本文讨论了Hilbert空间和Banach空间上线形有界算子和算子方程的扰动理论，得到了一系列结果。

The first type of variable speed system is designed to achieve the disturbance rejection, insensitiveness to parameter variations and the servo tracing to input speed.

第一类系统的设计是为了获得对电机参数偏移及外界扰动的强鲁棒性以及对不同转速输入形式下的快速跟踪能力。

The method of slide-mode variable structure control is such a strategy that is characterized of low mathematical model precision, insensitiveness to system parameter variation and external disturbances, omission of parameter identifications, fast dynamic response and easy implementation. These advantages make it suitable to high performance vector controlled AC motor drives.

滑模变结构控制是一种强鲁棒性的控制方法，对系统数学模型精度要求不高，具有快速响应、对参数及外部扰动变化不敏感、无需系统在线辨识，实现简单而且很适合计算机实现等优点，因此，很适合高性能的交流电机矢量控制系统。

Based on independent component analysis, a method to detect and recognize instantaneous power quality distortion signal is proposed.

提出一种基于独立分量分析(independent component analysis，ICA)的瞬时电能质量扰动信号检测与判别方法。

Different disturbance frequencies have different effects on void wave instantaneous velocity probability distribution.

不同外加扰动频率对空隙率波瞬时波速概率分布的影响不同。

ABSTRACT Particle image velocimetry is emerging as a powerful measurement technique, which can give the instantaneous planar velocity...

PIV是一种非接触、无扰动、全流场光学测速系统，它能测量的瞬态平面上的速度并能在线观察流场情况。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。