Globally asymptotic stabilization for nonlinear time-delay systems with ISS inverse dynamics

The output feedback stabilization is considered for a class of nonlinear time-delay systems with inverse dynamics in this paper.An appropriate state observer is constructed for the unmeasurable system states in order to realize the control objective.By adopting the backstepping and Lyapunov-Krasovskii functional methods,a systematic design procedure for a memoryless output feedback control law is presented.It is shown that the designed controller can make the closed-loop system globally asymptotically stable while keeping all signals bounded.An illustrative example is discussed to show the effectiveness of the proposed control strategy.     

On the nature of the active state of silver during catalytic oxidation of methanol

Under the applied high reaction temperatures (900 K) the Ag surface is restructured and a tightly held oxygen species is formed on the surface (O) apart from O atoms dissolved in the bulk (O). Methanol oxidation to formaldehyde proceeds through this O species as demonstrated by application of a variety of spectroscopic techniques.     

Robustness of ISS systems to inputs with limited moving average: Application to spacecraft formations

We provide a theoretical framework that fits realistic challenges related to spacecraft formation with disturbances. We show that the input‐to‐state stability of such systems guarantees some robustness with respect to a class of signals with bounded average‐energy, which encompasses the typical disturbances acting on spacecraft formations. Solutions are shown to converge to the desired formation, up to an offset, which is somewhat proportional to the considered moving average of disturbances. In the presence of fast peaking perturbations, the approach provides a tighter evaluation of the disturbances' influence, which allows for the use of more parsimonious control gains. Copyright © 2015 John Wiley & Sons, Ltd.     

一个基于Web Service的异构信息集成方案

通过分析传统异构信息系统所存在的问题,提出一种基于Web Service技术的异构信息集成方案,建立统一的信息封装协议--REML.利用Web Service实现异构信息系统的重新利用,使得已有信息系统不必经过重新开发,就能被用户所访问,实现异构的信息资源集成共事.     

带输入延时的连续时间系统的离散化

含多项式插值的Runge-Kutta方法应用于对带输入延时的连续时间系统的离散化中. 与传统的离散化方法相比, 本文提出的方法是有效且精度高阶的. 此方法的精度与Runge-Kutta法及插值多项式的精度紧密相关. 本文讨论了离散化方法的近似精度阶及最大可达的精度阶. 除此之外, 也分析了方法的输入状态稳定性. 为保证相应离散系统的稳定性, 可通过考察RK法的绝对稳定域来选择采样时间. 特别当RK法是A-稳定时, 可以不受稳定性的约束选择采样时间. 最后提供了一个数值例子来证明方法的优越性.     

Notions of exponential robust stochastic stability,ISS and their Lyapunov characterizations

Concepts of exponential global robust stability for stochastic control systems are analysed in terms of Lyapunov functions. The main result of the paper constitutes a generalization of a converse stability theorem due to Khasminskii for stochastic differential equations and establishes that, under certain hypotheses, the origin is robustly exponentially stable in the rth mean, if and only if the system admits a Lyapunov function which is smooth except possibly at the origin. The main result concerning robust asymptotic stability enable us to derive a Lyapunov‐like characterization for the concept of stochastic input‐to‐state stability (ISS). Copyright © 2003 John Wiley & Sons, Ltd.     

Pid Performance Tuning Methods For A Robotic Manipulator Based On Iss

This paper proposes performance tuning methods for a PID controller for a robotic manipulator. The design procedures of an inverse optimal PID control method employed to assure extended disturbance input‐to‐state stability (ISS) are suggested. The performance tuning methods for an inverse optimal PID control are derived from the performance limitation and the bounds of the state vector. Also, the effects of proportional and integral gains are considered in evaluating the performance tuning. Finally, we show the validity of the performance tuning methods through the experiment on a robotic manipulator.     

SystemC2.0的事务级建模

采用SystemC2.0,结合AMBA片上总线，探讨了在事务级的建模方法，并结合JPEG2000中的无损小波提升算法给出建模实例。介绍TsystemC2.O通过指令集模拟器建立事务级处理器模型的一般方法和步骤。