一类不确定非线性互联系统的变结构控制(英)

讨论一类不确定非线性大系统的鲁棒镇定问题．基于输入－输出线性化和变结构控制理论,分别设计了分层和分散变结构控制律来实现渐近的鲁棒稳定,并用一个受扰双摆系统的仿真实验说明所提控制方案的有效性．     

（H,φ）—变分不等式及其若干性质

定义了（ｈ，φ）－变分不等式及（ｈ，φ）－广义单调函数，并探讨了与（ｈ，φ）－广义单调函数有关的（ｈ，φ）－变分不等式的若干性质。     

H－空间上的一个变分不等式

在Hausdorff空间上证明了一个H－KKM定理。作为应用，给出了H－空间上的一个变分不等式，改进和推广了献[1]中的相应结果。     

N-苯甲酰基-N′-(4-溴苯基)硫脲的合成

用二氯甲烷作溶剂，以PEG－400为催化剂，合成N－苯甲酰基－N′－（4－溴苯基）硫脲，并用红外光谱对其结构进行表征。     

N—硝基—N—氨基（取代）甲酰—2，4，6—三氯苯氨类化合物的合成

合成了两种新型兼有植物生长调节剂和除草剂功效的N硝基－N－氨基（取代）甲酰－2，4，6－三氯苯氨类化合物，并经元素分析、红外光谱等证实了它们的结构。     

论模糊BH-代数

引入了模糊BH－代数和模糊拓扑BH－代数的概念，给出了一些有关的性质，并用Foster关于同态象和同态逆象的结构讨论了模糊拓扑BH－代数。     

Z—4—（对—溴苯硫基）—3—（对—硝基苯甲酰氧基）—3—丁—2—酮的立体选择性合成和Diels—Alder反应活性研究

合成了一个新的α，β取代3－丁烯－2－酮（CH3COC（p-NO2C6H4COO-(=CH-S-C6H4Br0-p(4)，用元素分析，核磁共振波谱和X－衍射对其结构进行了表征，并对其构型和Diels-Alder反应活性进行了探讨，结果表明只有Z构型的产物生成，Z－4－溴－3－（对－硝基苯 ）3－3丁－2－酮可与丁二烯型化合物发生Diels-Alder反应，而标题化合物在相似条件下不能发生Diels-Alder反应。     

变质量非完整可控力学系统的相对论性Boltmann—Hamel方程

同时考虑经典变质量和相对论变质量情况,运用变质量非完整可整可控力学系统的相对论性ＤＡｌｅｍｂｅｒｔ－Ｌａｇｒａｎｇｅ原理,得到了变质量非线性非完整可控系统在准坐标系下的相对论性Ｂｏｌｔｍａｎｎ－Ｈａｍｅｌ方程,     

H—空间中的新型KKM定理及其等价形式与应用

本证明了H－空间中一个新型非空交定理，并且得到了它的四种等价形式，作为应用，本研究了经济平衡的问题和广义变分不待式解的存在性问题。     

5——戊基——2，3——二甲吡嗪的新合成方法及其谱图研究

本报道了用2,3－－二甲吡嗪和正己酸在自由基引发剂引发下合成5－－戊基－－2,3－－二甲吡嗪的新合成方法研究,并对合成条件进行了探索。用元素分析、红外光谱、氢核磁共振谱表征了目标物结构。     

一种新的遗传算法及其在机器人变结构控制中的应用

A novel genetic algorithm (NGA) is proposed, which possesses micro-regulation and renascence operation. The optimized variable searching interval is regulated gradually according to the sub-group of excellent individuals. The NGA is used to optimize the parameters of the variable structure control (VSC), which satisfies the new reaching law and sliding mode. It is used in robot control systems. Simulation results are given.     

静止同步补偿器的非线性控制

静止同步补偿嚣(STATCOM,Static Synchronous Compensator)是一个多变量、非线性、强耦合的系统,建立精确的换流器数学模型比较困难.本文采用非线性变换和非线性系统反馈线性化理论,建立同步旋转坐标系下STATCOM的非线性数学模型,结合线性系统最优控制原理,设计STATCOM的状态反馈线性化解耦控制器,实现有功功率和无功功率的解耦控制.基于PSCAD/EMTDC的数字仿真,验证了所设计的控制器具有良好的控制性能.     

When professors confront themselves: Towards a theoretical conceptualization of video self-confrontation in higher education

The use of video self-confrontation (VSC) Throughout the paper, the abbreviation VSC will be used for video self-confrontation. as a method to reinforce desired behaviors or induce changes in human behavior, has been increasing in recent years. The major reviewers of the literature on VSC in the last three decades point out that there is relatively little qualitative and quantitative research which explores the underlying processes of VSC and its theoretical conceptualization. Moreover, there is still a need to prove many of the claims advanced by practitioners about the effectiveness of VSC. This article reviews two of the theoretical conceptualizations and tentative explanations of the VSC process. The first is based on affect, such as self-confrontation, dissonance, anxiety, stress, distress and eustress. The second explanation is based on a cognitive and information-processing approach and includes: feedback, self-concept, self-efficacy and attribution theories. The article describes an emerging integrated conceptualization which may provide better insight into the process which should be the focus of further studies. The main purpose of VSC in higher education is to improve teaching-learning processes. Faculty's commitment to this purpose is determined by many factors, such as: their perception and attitudes towards the research/teaching dichotomy and the university's reward system; their motivation and concepts of self-efficacy and self-fulfillment; and their attribution mechanisms of success or failure in teaching. All these factors greatly influence their readiness to be motivated in VSC processes and the effectiveness of their VSC uses. VSC is a powerful technique which has a great potential in facilitating behavioral changes. It can cause harm or be wasted if not used properly. Suggestions for optimal uses are presented.     

A robust gain-scheduling control based on VSC and fuzzy local controller network

Based on variable structure control (VSC) and fuzzy local controller network (FLCN), a new design method of robust gain-scheduling control is proposed in this paper. The proper sliding-modes and the tendency-rates for general operation-points are introduced such that the system gets into the sliding-modes’ motion as soon as possible and has the desired performance. Its good performance is due to the robustness of VSC. However, any local controller works well only in the local region of a specified operation-point. In this paper functions similar to the fuzzy-attributed function in fuzzy-systems are introduced to form FLCN. The simulation results showed that the presented method is feasible and acceptable. Project supported by the Natural Science Foundation of China (NSFC: 69934030) and the Zhejiang Provincial Natural Science Foundation of China (ZJPNSFC: ZD9905).     

变结构控制Buck变换器直流电动机调速

提出一种直流电动机降压调速新方法，用双滑模面变结构控制Buck变换器进行直流电动机降压调速，双滑模面分别实现直流电动机内外环控制，内环滑模面用于电流控制环，外环滑模面用于转速控制环。通过仿真和比较表明，这种变结构控制降压调速，可得到平滑无级调速；上升时间、调整时间均很小；有很强的鲁棒性；电枢电流和电磁转矩冲击可控制在允许值内。     

CONTINUOUS ROBUST TRACKING CONTROLLERS FOR A CLASS OF UNCERTAIN NONLINEAR DYNAMICAL SYSTEMS

ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｒｅｃｅｎｔｙｅａｒｓ,ｒｏｂｕｓｔｃｏｎｔｒｏｌｏｆｄｙｎａｍｉｃａｌｓｙｓｔｅｍｓｗｉｔｈｓｉｇｎｉｆｉｃａｎｔｕｎｃｅｒｔａｉｎｔｉｅｓｗａｓｗｉｄｅｌｙｒｅｓｅａｒｃｈｅｄ .Ｍａｎｙｎｅｗａｐｐｒｏａｃｈｅｓｈａｖｅｂｅｅｎｐｒｏｐｏｓｅｄｂａｓｅｄｏｎｓｏｍｅｄｅｓｉｒｅｄｐｅｒｆｏｒｍａｎｃｅｓ.ＴｈｅＬｙａｐｕｎｏｖｆｕｎｃｔｉｏｎｃｏｍｍｏｍｌｙｕｓｅｄｔｏｓｙｎ ｔｈｅｓｉｚｅｔｈｅｃｏｎｔｒｏｌｌｅｒ(Ｌｉ,1 996;Ｙａｌｌａｐｒａｇａｄａｅｔａｌ.,1 996…     

Continuous robust tracking controllers for a class of uncertain nonlinear dynamical systems

Robust tracking controller for a class of uncertain nonlinear dynamical systems, which are linearizable by input-output feedback with matching uncertainties, was investigated. In this study, uniform ultimate bound or uniformly asymptotic stability of tracking errors were obtained by different choice of the control gain. A simulation to determine the effectiveness of the proposed approach showed that the control performance was better than that of VSC (Variable Structure Control). Project(69934030) supported by Natural Science Foundation of China.     

Robust sliding mode control for uncertain discrete time systems

1. Introduction Sliding mode variable structure control (SMVSC) as a general design approach for a robust control system is well established. In recent years, a considerable amount of effort has been put into studying discrete sliding variable structure control (DSMVSC) with the development and application of computer [1-4]. However, theoretically speaking, DSMVSC can not be obtained from the continuous counterpart by means of simple equivalence [4]. Most of the research on DSMVSC f…     

Science Letters:Multi-frequency proportional-resonant (MFPR) current controller for PWM VSC under unbalanced supply conditions

This letter presents a multi-frequency proportional-resonant (MFPR) current controller developed for PWM voltage source converter (VSC) under the unbalanced supply voltage conditions. The delta operator is used in place of the shift operator for the implementation of MFPR by using a low-cost fixed-point DSP. The experimental results with an alternative control strategy validated the feasibility of the proposed MFPR current controller for the PWM VSC during voltage unbalance.