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Proceedings of the 38th IEEE Conference on Decision and Control (Cat. No.99CH36304)最新文献

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Continuous flow models: modeling, simulation and continuity properties 连续流模型:建模、仿真和连续性特性
Y. Wardi, B. Melamed
The paper presents a generic modeling tool for networks of continuous flow models (CFMs). The elemental building block, called the basic CFM, can be used in the modeling, simulation and sample path analysis of a large class of flow networks. Under certain conditions it constitutes a discrete event dynamic system (DEDS); for simulation thereof there exists a Lindley-like equation. Following the presentation of the basic CFM as a general modeling device, the paper discusses some continuity properties of the attendant flow processes, and points out the possible unbiasedness of LPA for various performance measures.
本文提出了一种用于连续流模型网络的通用建模工具。基本构建块称为基本CFM,可用于大型流网络的建模、仿真和样本路径分析。在一定条件下构成离散事件动态系统(DEDS);存在一个类似林德利方程来模拟它。在介绍了基本CFM作为一种通用的建模装置之后,本文讨论了伴随流动过程的一些连续性特性,并指出LPA对于各种性能测量可能具有无偏性。
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引用次数: 23
Supervisory control of nondeterministic discrete event systems with driven events via masked prioritized synchronization 带有驱动事件的不确定性离散事件系统的屏蔽优先同步监督控制
S. Jiang, R. Kumar
Studies the supervisory control problem of nondeterministic discrete event systems with driven events in the setting of masked prioritized synchronous composition (MPSC). MPSC was extended from prioritized synchronous composition (PSC) by Kumar and Heymann in order to permit systems interaction with their environment via interface masks. In their paper they solved the supervisory control problem under the assumption that the set of driven events is empty. In this paper the above assumption is removed. We first solve the supervisor synthesis problem for controlling the plant behavior as observed at the interface level, and then derive a necessary and sufficient condition for the existence of a supervisor for controlling the plant behavior as observed at the plant level. We establish a link between MPSC and PSC by showing that a supervisory control problem in the setting of MPSC can be transferred to a supervisory control problem in the setting of PSC under certain conditions. The results of this paper can also be used to derive the main result of Heymann and Lin (1998) which first showed that the supervisory control problem in the nondeterministic setting can be reduced to one in the deterministic setting.
研究了带有驱动事件的不确定离散事件系统在屏蔽优先同步组合(MPSC)设置下的监督控制问题。MPSC由Kumar和Heymann从优先同步组合(PSC)扩展而来,以便允许系统通过接口掩码与其环境进行交互。在他们的论文中,他们在假设驱动事件集为空的情况下解决了监督控制问题。本文排除了上述假设。我们首先解决了控制在界面层上观察到的植物行为的监督者综合问题,然后推导了控制在植物层上观察到的植物行为的监督者存在的充分必要条件。我们通过表明MPSC设置中的监督控制问题在一定条件下可以转移到PSC设置中的监督控制问题,建立了MPSC和PSC之间的联系。本文的结果也可以用来推导Heymann和Lin(1998)的主要结果,该结果首次表明,不确定性设置下的监督控制问题可以简化为确定性设置下的监督控制问题。
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引用次数: 10
Computational aspects of IQC-based stability analysis for sampled-data feedback systems 基于iqc的采样数据反馈系统稳定性分析的计算方面
H. Fujioka, K. Morimura
Computational methods are proposed for stability analysis of sampled-data feedback systems with integral quadratic constraint (IQC)-characterized perturbations. It is shown that, for a given IQ, one can exactly evaluate that the IQC guarantees the closed-loop stability or not by computing the L/sub 2/-induced norm of a certain sampled-data system. An approximated search method is also proposed based on the fast-hold signals, which leads to an LMI.
提出了具有积分二次约束(IQC)特征扰动的采样数据反馈系统稳定性分析的计算方法。结果表明,对于给定的IQ,可以通过计算某采样数据系统的L/sub 2/诱导范数来准确地评价IQC是否保证闭环稳定性。提出了一种基于快速保持信号的近似搜索方法,实现了LMI。
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引用次数: 5
Pole placement with sensitivity function shaping for a set of models via convex optimization 采用凸优化方法对一组模型进行了具有灵敏度函数整形的极点配置
J. Langer, I. D. Landau, A. Rantzer
Deals with the combined pole placement sensitivity function shaping method for the design of robust digital controllers. A controller parameterization has previously been presented which allows us to simultaneously achieve pole placement and sensitivity function shaping using convex optimization. The purpose of this paper is to explore the possibilities to extend these results to a set of plant models by overbounding this set with ellipses.
研究了用于鲁棒数字控制器设计的组合极点放置灵敏度函数整形方法。先前已经提出了一种控制器参数化方法,该方法允许我们使用凸优化同时实现极点放置和灵敏度函数整形。本文的目的是探索将这些结果扩展到一组植物模型的可能性,方法是用椭圆覆盖这组模型。
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引用次数: 0
Observer-based controller for a synchronous generator 同步发电机的基于观测器的控制器
R. Martínez-Guerra, J. De León‐Morales, O. Huerta-Guevara
An observer-based controller strategy for a synchronous generator is proposed. Our controller actually achieves both stability and tracking by linearizing the tracking error. Simulation results are given when this scheme is applied to a mathematical model describing the behavior of a synchronous generator.
提出了一种基于观测器的同步发电机控制器策略。我们的控制器实际上通过线性化跟踪误差来实现稳定性和跟踪。将该方案应用于描述同步发电机特性的数学模型,给出了仿真结果。
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引用次数: 2
Undiscounted two-person zero-sum communicating stochastic games 未折现的二人零和交流随机博弈
M. Baykal-Gursoy, Z. Avsar
Consider two-person zero-sum communicating stochastic games with finite state and finite action spaces under the long-run average payoff criterion. A communicating game is irreducible on a restricted strategy space where every pair of action is taken with positive probability. The proposed approach applies Hoffman and Karp's (1996) algorithm for irreducible games successively over a sequence of restricted strategy spaces that gets larger until an /spl epsiv/-optimal stationary policy pair is obtained for any /spl epsiv/>0. This algorithm is convergent for the games that have optimal strategies with a value independent of the initial state.
考虑在长期平均收益标准下,具有有限状态和有限行动空间的两人零和交流随机博弈。交流博弈在有限的策略空间中是不可约的,其中每一对行动都是正概率的。所提出的方法将Hoffman和Karp(1996)的算法应用于不可约博弈,在一系列受限策略空间上连续变大,直到获得任何/spl epsiv/>0的/spl epsiv/-最优平稳策略对。对于具有独立于初始状态的最优策略的博弈,该算法是收敛的。
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引用次数: 2
Efficient setup/dispatching policies in a semiconductor manufacturing facility 在半导体制造工厂中有效的设置/调度策略
S. Sethi, K. Chu, Houmin Yan
Semiconductor manufacturing requires repetitive use of several similar processing operations. Owing to economic considerations, these expensive machines are always shared among many products or a product at different stages of its manufacturing process. The machines require setups between the production of different products or different entries of the same product. Since a product may enter a machine several times for processing, the manufacturing system is often called a re-entrant shop. We consider the problem of reducing mean and variance of the cycle time in semiconductor manufacturing environments. Manufacturing systems are usually controlled in two major ways. In the first, a release policy specifies when new lots are to be released into the system. Whereas in the second, a scheduling policy controls the lots already in the system. It decides which lot is to be processed next at each machine, when it becomes available for processing. A bulk of previous research on the control of manufacturing systems focuses on the control of bottleneck machines. Performance measures of a manufacturing system depends on the ways in which the conflicts are resolved between products competing for the machines. Lu et al. (1994) develop a class of scheduling policies for systems where there is no machine setup required when switching products. We deal with a more general situation in which the machines require setups. We introduce scheduling policies incorporating setups, since the policies developed in the literature for systems requiring no setups are found to perform poorly for systems requiring considerable setups.
半导体制造需要重复使用几种类似的加工操作。出于经济上的考虑,这些昂贵的机器总是在许多产品或在其制造过程的不同阶段的产品中共享。机器需要在不同产品的生产之间或同一产品的不同条目之间进行设置。由于一个产品可以多次进入机器进行加工,因此制造系统通常被称为再入车间。本文研究了半导体制造环境中周期时间均值和方差的减小问题。制造系统通常以两种主要方式进行控制。在第一个系统中,发布策略指定何时将新批发布到系统中。而在第二种调度策略中,调度策略控制系统中已经存在的批。它决定哪批货在每台机器上下一步加工,当它可以加工时。以往对制造系统控制的大量研究主要集中在瓶颈机的控制上。制造系统的性能指标取决于产品之间争夺机器的冲突解决方式。Lu等人(1994)为切换产品时不需要机器设置的系统开发了一类调度策略。我们处理一种更一般的情况,即机器需要设置。我们引入了包含设置的调度策略,因为在文献中为不需要设置的系统开发的策略被发现对于需要大量设置的系统表现不佳。
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引用次数: 8
Uniting local and global controllers 联合本地和全局控制器
C. Prieur, L. Praly
We consider control systems for which we know two stabilizing controllers. The former is "optimal" but local, the latter is global. We look for a uniting control law providing a globally stabilizing locally optimal controller. We study several solutions based on continuous, discontinuous, hybrid, time varying controllers. One criterion of selection of a controller is the robustness of the global asymptotic stability to vanishing measurement noise. This leads us in particular to consider a kind of generalization of Krasovskii solutions for hybrid systems.
我们考虑已知两个稳定控制器的控制系统。前者是“最优的”,但是局部的,后者是全球性的。我们寻找一个能提供全局稳定的局部最优控制器的统一控制律。研究了基于连续、不连续、混合、时变控制器的几种解决方案。控制器选择的标准之一是全局渐近稳定性对测量噪声消失的鲁棒性。这特别导致我们考虑混合系统的Krasovskii解的一种推广。
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引用次数: 74
Design of integrated fault detection, diagnosis and reconfigurable control systems 集成故障检测、诊断和可重构控制系统的设计
Youmin Zhang, Jin Jiang
In this paper, a novel approach for integrated fault detection, diagnosis and reconfigurable control systems design in the discrete-time stochastic domain is proposed. The scheme is based on a two-stage adaptive Kalman filter for simultaneous state and fault parameter estimation, statistical decisions for fault detection, diagnosis and activation of controller reconfiguration. Using the information provided by the fault detection and diagnosis scheme, the reconfigurable controller is designed automatically using an eigenstructure assignment technique. To eliminate the steady-state tracking error, a feedforward reconfigurable control law is also incorporated. The proposed approach has been evaluated using two examples. The effectiveness and superiority of the proposed approach have been demonstrated in comparison with existing reconfigurable controllers which are based on linear quadratic regulator and other eigenstructure assignment techniques.
本文提出了一种基于离散时间随机域的集成故障检测、诊断和可重构控制系统设计的新方法。该方案基于两阶段自适应卡尔曼滤波,用于同步状态和故障参数估计,用于故障检测、诊断和控制器重构激活的统计决策。利用故障检测诊断方案提供的信息,采用特征结构分配技术自动设计可重构控制器。为了消除稳态跟踪误差,还引入了前馈可重构控制律。用两个实例对所提出的方法进行了评价。通过与现有基于线性二次型调节器和其他特征结构分配技术的可重构控制器的比较,证明了该方法的有效性和优越性。
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引用次数: 72
Partial averaging of functional differential equations 泛函微分方程的偏平均
B. Lehman, S. Weibel
Develops a framework for averaging functional differential equations (FDEs) with two time scales. Averaging is performed on the fast time system, while slow time is 'frozen.' This creates an averaged equation which is slowly time-varying, hence the terminology of partial averaging. We show that solutions of the original FDE and its corresponding partially averaged equation remain close on arbitrarily long but finite time intervals. Next, assuming that the partially averaged system has an exponentially stable equilibrium point and that we restrict our interest to initial conditions that lie in the domain of exponential stability, the finite-time averaging results are extended to infinite time. In the special case of pointwise delays, exponential stability of the averaged system can be related to the frozen-time eigenvalues of its linearization.
开发了一个具有两个时间尺度的平均泛函微分方程(FDEs)的框架。平均是在快时间系统上执行的,而慢时间是“冻结”的。这创造了一个缓慢时变的平均方程,因此有了部分平均的术语。我们证明了原始FDE及其相应的部分平均方程的解在任意长而有限的时间间隔内保持接近。接下来,假设部分平均系统有一个指数稳定的平衡点,并且我们将我们的兴趣限制在指数稳定域中的初始条件,有限时间平均结果被扩展到无限时间。在点延迟的特殊情况下,平均系统的指数稳定性可以与其线性化的冻结时间特征值有关。
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引用次数: 2
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Proceedings of the 38th IEEE Conference on Decision and Control (Cat. No.99CH36304)
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