反馈线性化在液压型风力发电机组功率追踪中的应用

以液压型风力发电机组为研究对象,为使功率追踪的过程平稳,研究机组的最佳功率追踪控制方法.本文利用反馈线性化方法解决系统非线性问题,以液压系统压力为控制输出,设计最佳功率追踪控制器,并提出一种反馈线性化方法的工程应用解决方案,即结合传统PID控制解决反馈线性化工程应用中依赖模型参数精度的问题.依托30 k VA液压型风力发电机组半物理仿真实验台进行仿真和实验研究,验证了该方法的可行性,为机组进一步研究奠定理论与实验基础.     

A new approach to robust reliable H∞ control for uncertain nonlinear systems

This paper focuses on the optimal robust reliable H_∞ control for a class of uncertain nonlinear systems with actuator faults. A new method of annihilating uncertain matrix is proposed. Based on this approach, a new method of disposing of the phenomenon of uncertain matrices multiplication is provided. In accordance with the method, the optimal robust reliable H_∞ control problem for uncertain nonlinear systems is settled by employing state feedback, in terms of linear matrix inequality (LMI). Finally, two illustrative examples are given to show the feasibility and validity of the proposed method.     

A Simultaneous Mixed LQR/H∞ Control Approach to the Design of Reliable Active Suspension Controllers

This paper is concerned with the synthesis of reliable controllers for quarter‐car active suspension systems. By a simultaneous mixed LQR/H_∞ control approach, a static output feedback controller is derived for guaranteeing good suspension performance under possible sensor fault or suspension component breakdown. The considered simultaneous mixed LQR/H_∞ control problem is a nonconvex optimization problem; therefore, the linear matrix inequality approach is not applicable. Based on the barrier method, we solve an auxiliary minimization problem to get an approximate solution for the simultaneous mixed LQR/H_∞ control problem. Necessary conditions for the local optimum of the auxiliary minimization problem are derived. Moreover, a three‐stage solution algorithm is developed for solving the auxiliary minimization problem. The simulation shows that the obtained static output feedback suspension controllers can improve suspension performance in nominal mode and all considered failure modes.     

基于滑动拟合阶次和统计方法的模态阻尼比辨识技术

针对在使用环境激励进行模态辨识时,模态阻尼比辨识结果散布较大的问题,提出基于滑动拟合阶次与统计方法结合的模态阻尼比辨识方法,作为特征系统实现算法（Eigensystem Realization Algorithm,ERA）的前后处理方法,从而提高模态阻尼比的辨识精度和稳定性.详细介绍ERA环境激励模态辨识理论;给出滑动拟合阶次与统计方法相结合的模态阻尼比辨识方法以及流程.通过算例验证该方法的有效性.     

Time-local formulation and identification of implicit Volterra models by use of diffusive representation

We present a time-continuous identification method for nonlinear dynamic Volterra models of the form HX=f(u,X)+v with H, a causal convolution operator. It is mainly based on a suitable parameterization of H deduced from the so-called diffusive representation, which is devoted to state representations of integral operators. Following this approach, the complex dynamic nature of H can be summarized by a few numerical parameters on which the identification of the dynamic part of the model will focus. The method is validated on a physical numerical example.     

异质环境中可靠组播的代理结构

文章提出了一种适于异质网络环境的可靠组播代理结构。这种代理结构将网络环境相异的可靠组播会话分解成若干个网络环境相似的子会话,从而缓解了异质网络环境的异构问题。不仅如此,通过在可靠组播代理中引入应用程序的语义,实现了语义可靠性,即应用程序能够根据语义控制它所需要的数据可靠性。     

会计事后监督系统

针对中国工商银行江西省分行会计事后监督系统的异种机网络构成,应用程序的实现和环境的配制进行了全面的阐述。     

Structural Synthesis of Modular Weakly Connected Neural Networks. I. Methodology of Structural Synthesis of Modular Neural Networks

Structural models of modular neural networks without loops are considered. The notion of a weakly connected network is introduced. A genetic principle of generation of weakly connected neural networks is proposed, and its reproductive power is proved on the basis of the theory of categories. Algorithmic realizations of structural synthesis are considered. Some examples are given.     

Internet可靠多点投递拥塞控制研究进展

Ｉｎｔｅｒｎｅｔ可靠多点投递拥塞控制研究是当前可靠多点投递协议研究的活跃领域,许多多点投递拥塞控制机制已经提出来了。文中首先提出了Ｉｎｔｅｒｎｅｔ可靠多点投资拥塞控制的基本问题,然后概述解决这些问题的方案和遇到的困难,最后指出将来的工作方向。     

基于组件技术的学生管理系统的设计和实现

组件技术的应用不仅可提高软件开发效率和软件质量,还可降低开发成本和管理费用。文章通过对组件技术的探讨,介绍了基于组件技术的学生管理系统的设计和开发过程。