非匹配不确定非线性系统的鲁棒自适应控制

针对一类非匹配不确定非线性系统,研究了一种适用于输出跟踪的鲁棒自适应控制器设计新方法。结合反演设计方法和"σθ-修改"参数自适应技术所设计的控制器,对非匹配的未知参数和非参数有界不确定项具有强鲁棒性。该控制器不仅能保证闭环系统所有信号有界,且能使跟踪误差以指数速度收敛到零的小邻域内。计算机仿真算例证实了理论结果的可行性和有效性。     

参数未知非线性混沌系统的自适应反演滑模控制

针对一类含有非匹配未知参数和非参数不确定性的混沌系统,基于自适应反演和滑模控制方法,研究自适应反演滑模控制策略,实现了不确定混沌系统的调节问题。与现有自适应控制相比,允许系统存在非匹配未知参数和非参数化的不确定性,增强了控制系统的鲁棒性。仿真算例证明了理论研究成果的正确性和鲁棒性。     

超混沌Lü系统的非线性反馈自适应同步

针对Aimin chen提出来的超混沌Lü系统的同步问题,分别在已知参数和未知参数的情况下设计了非线性反馈自适应控制器,使两个恒同的超混沌Lü系统在全局范围内实现同步,并且在未知参数情况下,实现了参数的跟踪,避免了线性控制中混沌系统的界的估计问题。用Lyapunov方法从理论上证明了结论,并用数值仿真验证了理论结果。     

不确定非完整移动机器人的自适应模糊控制

为解决具有两个驱动轮的受非完整约束移动机器人的轨迹跟踪问题,首先针对系统的运动学模型,设计了一个运动学控制器;然后,基于系统的动力学模型和运动学控制器,设计了一个自适应模糊控制器,该控制器能有效地克服机器人模型参数未知和扰I动的影响,并利用Lyapunov稳定性理论证明了系统的稳定性且跟踪误差收敛.仿真结果表明文章所设计的控制器具有良好的控制效果.     

Rossler系统与统一混沌系统的异结构同步

针对异结构混沌系统的同步提出了两种不同的同步方案,研究了两个不同结构的混沌系统:Rossler系统与统一混沌系统的同步。系统参数已知时采用主动控制方法,通过设计适当的主动控制器,实现了响应系统与驱动系统的渐近同步;系统参数不确定或未知时采用自适应控制方法,基于李亚普诺夫稳定性理论,得出了两异结构混沌系统同步的充分条件,设计了相应的控制器和参数自适应律,使得响应系统的状态变量渐近跟踪驱动系统的状态变量,且两个系统的参数估计值渐近收敛于其真值,仿真结果证明了两种方案的有效性。     

新型四维超混沌系统广义投影同步及自适应同步

基于Lyapunov稳定性理论,设计合适的非线性反馈控制器以及参数更新规则,实现一类混沌系统的自适应广义投影同步.该控制器既可以适用于不包含未知参数的广义投影同步,又适用于包含未知参数的自适应广义投影同步.以新型四维超混沌系统为例,考虑含有未知参数和不含有未知参数的两种情况,从而实现驱动系统和响应系统渐近地达到所有状态向量的按照不同比例广义投影同步,同时辨识出系统的未知参数.数值模拟结果表明了所设计控制器的有效性.     

混沌系统模糊自适应采样同步控制研究

主要针对两个具有参数未知的模糊混沌系统设计模糊自适应采样控制器,并利用 Lyapunov稳定理论和线性矩阵不等式技术获得系统控制器的增益,实现了一类参数未知模糊混沌同步.设计的自适应采样同步控制器与同类控制器相比更适合计算机控制实现,拥有更广阔的应用前景.仿真结果表明所提出的控制方法是有效的.     

异结构不确定混沌系统的广义投影同步

针对一类参数随时间变化的不确定混沌系统,用鲁棒自适应方法实现异结构混沌系统的广义投影同步和参数辨识。基于李亚普诺夫稳定性理论,设计了鲁棒自适应控制器和参数自适应律。通过改变广义投影同步的比例矩阵,获得所有状态变量任意比例于原驱动系统的混沌信号,并辨识出系统所有未知参数。以R-ssler超混沌系统和Lü超混沌系统为例,数值仿真验证了所设计方法的有效性和可行性。     

新型超混沌系统的改进自适应广义投影同步

基于Lyapunov稳定性理论,设计合适的非线性控制器以及参数更新规则,实现一类混沌系统以及超混沌系统的改进自适应广义投影同步。该方法可以使得驱动系统和响应系统渐近地达到所有对应状态向量,按照不同的比例进行同相位或者反相位投影同步,同时既可以对响应系统中的未知参数进行辨识,也可以对驱动系统中的未知参数进行辨识,当然,该方法也可以适用于不包含未知参数的混沌系统广义投影同步。以新型的四维超混沌Lorenz系统和超混沌Chen系统为例,数值模拟结果表明了所设计控制器的有效性。     

基于鲁棒控制Lyapunov函数的非线性自适应跟踪

研究了一类带有未知参数以及扰动的多输入非线性系统的自适应跟踪问题，利用控制Lyapunov方法设计出一种自适应控制器。该控制器对系统的参数和状态的不确定性具有鲁棒性，并且能保证系统闭环全局稳定。仿真结果表明，该控制方案具有良好的跟踪性能、鲁棒性及参数辨识能力。     

Archaeology of (systems) inquiry

In this paper six scenarios for the future of systems problem solving are investigated in order to ascertain whether an approach can be identified (a) that offers prospects for the long-term survival and success of systems problem solving in practice and (b) that does this without incorporating theoretical contradictions. The six approaches come under the four class headings pragmatism, isolationism, imperialism, and pluralism. The theoretical foundations of each approach are explored in a discursive fashion. This makes explicit to systems practitioners the underlying principles on which their activities are overlaid and puts such approaches into the theoretical context of the six approaches identified herein.     

系统方法论研究的现状分析与展望

对目前系统方法论的研究进行分类：硬系统方法论、软系统方法论和批评性系统方法论，分析了不同系统方法的哲学思想、方法步骤及其局限性，探讨了未来系统方法论发展的形式。     

Systemic methods for the analysis of failure

For more than 20 years systems-related ideas have been used to analyze and model failures and disasters of various sorts. The authors outline some examples of the links that have been forged between failures and systems over this period. An overview of the origins and development of systems failures teaching and research at the United Kingdom Open University is also presented, together with two systemic methodologies for the analysis of failure that have stemmed from this work. The implications of recent research on the application of the more sophisticated of these two methodologies are also discussed.     

A Maturing of Systems Thinking? Evidence from Three Perspectives

This paper reviews trends in systems theory/thinking from the 1970s to the early 2000s. It proposes a maturation of the field based on certain conceptual and methodological advances that have sought to liberate systems thinking from earlier strictures. An edited dialogue among three prominent systems thinkers from different systems schools—Merrelyn Emery, Bob Flood, and Eric Wolstenholme—provides evidence. Similarities and differences are identified, complementarities among the schools are derived and analyzed, and trajectories for future research are indicated.     

高层管理信息系统(EIS)及其开发策略的研究

分析了可供高层管理者直接使用的计算机信息系统（ＣＩＳ）匮乏的主要原因，指出开发ＥＩＳ是改变这一局面的有效途径。本文还研究了ＥＩＳ的开发策略，提出了一些对将参与ＥＩＳ的论证、设计和实施的专业人员及系统的使用者来说值得共同关注的问题.     

2－D广义Roesser模型的约化

本文讨论了将２－Ｄ广义Ｒｏｅｓｓｅｒ模型化成正常模型以及将非主项系统化成主项系统的问题，给出了解决这些问题的几个判别条件和具体方法，然后以实例对结果进行了说明．本文给出的各种方法主要是通过系统的等价变换，计算量不大．     

从系统思想到系统实践的创新——钱学森系统研究的成就和贡献

本文介绍了钱学森从系统思想到系统实践创新过程所取得的成就和贡献,包括建立系统科学体系与系统认识论、系统综合集成方法体系与系统方法论以及系统工程与系统实践论.它们分别反映了钱学森系统科学思想、系统综合集成思想和系统实践思想也就是系统工程思想.这些成就具有重要的科学价值和实践意义以及现实意义.     

基于仿真的指挥自动化系统开发方法研究

指挥自动化系统的开发是一项复杂的系统工程,开发过程面陆的困难和问题很多,往往耗资巨大但达不到最终要求,采用先进的系统设计方法是改善系统开发质量的重要途径.仿真是复杂系统试验研究的重要方法,在我国指挥自动化系统开发的局部领域得到了应用,但缺乏对系统开发过程提供全方位的支持.结合我国指挥自动化系统研制程序和仿真应用现状,提出了基于仿真的指挥自动化系统开发方法,并提出了其实现框架,部分研究成果已在具体项目中得到了应用.     

Systems engineering research

In this paper, we propose selected research topics that are believed central to progress and growth in the application of systems engineering （SE）. As a professional activity, and as an intellectual activity, systems engineering has strong links to such associated disciplines as decision analysis, operation research, project management, quality management, and systems design. When focussing on systems engineering research, we should distinguish between subjects that are of systems engineering essence and others that more closely correspond to those that are more relevant for related disciplines.     

The roots of reductionism: A counter-ontoepistemology for a systems approach

Both an ontoepistemology for reductionist modern science (counter-ontoepistemology) and an ontology for interpretive Systemology have been outlined in the two preceding papers in this special issue ofSystems Practice. In the present article, the notion of truth is interpreted in terms of both the ontoepistemology of reductionism and the ontology of interpretive systemology. Both interpretations are discussed. Such a discussion represents the objective of this paper, that is, to outline the epistemological face of the ontoepistemology of interpretive systemology. In order to design that epistemological face, the relation between ontology and epistemology must be clarified. Such a relation is seen from the standpoint already provided by the ontology. After the discussion on the notion of truth, the general shape of a systemic-interpretive inquiring process is outlined.