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2007 European Control Conference (ECC)最新文献

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Conditioned invariance and unknown-input observation for two-dimensional Fornasini-Marchesini models 二维Fornasini-Marchesini模型的条件不变性和未知输入观测
Pub Date : 2007-07-02 DOI: 10.23919/ECC.2007.7068468
L. Ntogramatzidis, M. Cantoni
The concept of conditioned invariance is extended for the class of 2-D systems described by Fornasini-Marchesini models in the most general form proposed by Kurek. Then, the use of this concept is investigated within the context of estimation in the presence of unknown inputs.
将条件不变性的概念推广到由Kurek提出的最一般形式的Fornasini-Marchesini模型所描述的二维系统。然后,在存在未知输入的估计环境中研究了该概念的使用。
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引用次数: 6
Optimal control and piecewise parametric programming 最优控制与分段参数规划
Pub Date : 2007-07-02 DOI: 10.23919/ECC.2007.7068427
D. Mayne, S. Raković, E. Kerrigan
This paper deals with the problem of parametric piecewise quadratic programming (in which the cost is a piecewise quadratic function of both the decision variable and a parameter) and the problem of parametric piecewise affine quadratic programming (in which both the cost and the constraint depend on a piecewise affine function of the decision variable and a parameter). Parametric programming seeks a solution for each value of the parameter, and can therefore be used to obtain explicit solutions of some constrained optimal control problems where the state is the parameter. The technique of reverse transformation for parametric programming, introduced in earlier papers, is extended to remove unnecessary overlapping of polytopes on which the solution is defined. The improved technique is then employed for the determination, using dynamic programming, of explicit control for linear systems with a piecewise quadratic cost and explicit control of piecewise affine systems with quadratic cost.
本文研究了参数分段二次规划问题(其中代价是决策变量和参数的分段二次函数)和参数分段仿射二次规划问题(其中代价和约束都取决于决策变量和参数的分段仿射函数)。参数规划寻求每个参数值的解,因此可以用来获得一些状态为参数的约束最优控制问题的显式解。在之前的论文中介绍的参数规划的逆变换技术,被扩展到去除解被定义在其上的多面体的不必要的重叠。改进后的技术随后被用于确定,使用动态规划,线性系统的显式控制的分段二次代价和显式控制的分段仿射系统的二次代价。
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引用次数: 9
Dead-time Compensator Volterra Predictive Controller of a Van de Vusse CSTR Van de Vusse CSTR的死区补偿器Volterra预测控制器
Pub Date : 2007-07-02 DOI: 10.23919/ECC.2007.7068372
F. Dorado, J. Normey-Rico, C. Bordons, E. Camacho
This paper presents the application of a Dead-time Compensator Volterra-based Predictive Control (DTCVPC) to the benchmark control problem of the isothermal operation of a continuous stirred tank reactor (CSTR) with Van de Vusse reactions which includes an on-line concentration analyser that introduces a dead time on the process. The proposed controller incorporates a special dead-time compensator structure which allows for robustness improvement with respect to traditional nonlinear MPC in the presence nonlinearities, dead time and dead-time uncertainties. The use of the Volterra models in the optimisation allows for a low cost consuming algorithm.
本文将基于死区时间补偿器voltera的预测控制(DTCVPC)应用于具有Van de Vusse反应的连续搅拌槽式反应器(CSTR)等温运行的基准控制问题,该反应器包括一个在线浓度分析仪,该分析仪在过程中引入了死区时间。该控制器采用了一种特殊的死区补偿结构,在存在非线性、死区和死区不确定性的情况下,相对于传统的非线性MPC,鲁棒性得到了提高。在优化中使用Volterra模型可以实现低成本消耗算法。
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引用次数: 1
The connection admission problem in internet networks: An optimal control approach 互联网络中的连接允许问题:一种最优控制方法
Pub Date : 2007-07-02 DOI: 10.23919/ECC.2007.7068250
C. Bruni, F. Delli Priscoli, G. Koch, I. Marchetti
This paper focuses on Connection Admission Control Problem and it proposes an innovative approach for its solution. Starting from an abstract network modelling, the Resource Management problem is formulated in a technology independent fashion allowing the proposed concepts to be applied to any wireless and wired domain. Basing on appropriate considerations, the authors propose an approach in which CAC procedure is decoupled from the other Resource Management procedures, but still cooperates with them in order to guarantee the desired QoS requirements. Moreover, the proposed CAC control scheme is implemented on a feedback loop on the basis of a convenient optimality criterion aiming to maximize total throughput, while respecting a set of constraints accounting for the QoS requirements. Finally, this approach is based on suitable performance measurements which, by using proper predictors, allow to forecast the domain dynamics in the next future.
本文重点研究了连接允许控制问题,并提出了一种解决该问题的创新方法。从抽象的网络建模开始,资源管理问题以技术独立的方式制定,允许所提出的概念应用于任何无线和有线领域。在适当考虑的基础上,作者提出了一种CAC过程与其他资源管理过程解耦的方法,但仍然与它们合作,以保证期望的QoS要求。此外,所提出的CAC控制方案基于一种方便的最优性准则在反馈环路上实现,旨在最大化总吞吐量,同时尊重一组考虑QoS要求的约束。最后,该方法基于适当的性能测量,通过使用适当的预测器,可以预测下一个未来的领域动态。
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引用次数: 2
An iterative algorithm to solve Algebraic Riccati Equations with an indefinite quadratic term 求解不定二次项代数里卡蒂方程的迭代算法
Pub Date : 2007-07-02 DOI: 10.23919/ECC.2007.7068239
A. Lanzon, Yantao Feng, B. Anderson
In this paper, an iterative algorithm to solve Algebraic Riccati Equations (ARE) arising from, for example, a standard H∞ control problem is proposed. By constructing two sequences of positive semidefinite matrices, we reduce an ARE with an indefinite quadratic term to a series of AREs with a negative semidefinite quadratic term which can be solved more easily by existing iterative methods (e.g. Kleinman algorithm in [2]). We prove that the proposed algorithm is globally convergent and has local quadratic rate of convergence. Numerical examples are provided to show that our algorithm has better numerical reliability when compared with some traditional algorithms (e.g. Schur method in [5]). Some proofs are omitted for brevity and will be published elsewhere.
本文提出了一种求解代数Riccati方程(ARE)的迭代算法,以标准H∞控制问题为例。通过构造两个正半定矩阵序列,我们将一个具有不定二次项的ARE简化为一系列具有负半定二次项的ARE,这些ARE可以通过现有的迭代方法(如Kleinman算法[2])更容易地求解。证明了该算法具有全局收敛性和局部二次收敛率。数值算例表明,与一些传统算法(如[5]中的Schur方法)相比,本文算法具有更好的数值可靠性。为简洁起见,省略了一些证明,将在别处发表。
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引用次数: 19
Control theoretic tools for robust decision planning 鲁棒决策规划的控制理论工具
Pub Date : 2007-07-02 DOI: 10.23919/ECC.2007.7068620
J. Tierno, A. Khalak
Continuous planning is emerging as the leading solution to the problem of planning for systems with significant uncertainty. However, continuous planning can yield unexpected poor performance due to the necessary incompleteness of the system models used for planning. In this paper, we show how the ideas of plan repair and discount factors can be formalized, quantified, and extended to develop robust continuous planners. This is achieved without increasing computational complexity or requiring extensive additional modeling.
对于具有重大不确定性的系统的规划问题,连续规划正在成为主要的解决方案。然而,由于用于规划的系统模型的必要的不完整性,持续的规划可能会产生意想不到的低性能。在本文中,我们展示了如何将计划修复和折扣因素的思想形式化,量化和扩展以开发稳健的连续计划。这是在不增加计算复杂性或需要大量额外建模的情况下实现的。
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引用次数: 0
The application of Model Predictive Control to normalize glycemia of critically ill patients 模型预测控制在危重患者血糖正常化中的应用
Pub Date : 2007-07-02 DOI: 10.23919/ECC.2007.7068484
T. Van Herpe, Niels Haverbeke, B. Pluymers, G. Van den Berghe, B. De Moor
In this paper we propose a Model based Predictive Controller (MPC) to be used for glycemia control in critically ill patients. A model, that is particularly developed for describing the glucose and the insulin dynamics of these patients, is estimated for each individual patient and re-estimated as new measurements are obtained. Both a quantitative and a qualitative analysis are performed with respect to a real-life dataset from 19 critically ill patients. In the first analysis the robustness of the MPC is tested assuming a once per hour or a once per four hours insulin adaptation frequency is imposed. The second analysis is characterized by a comparison between the MPC insulin infusion sequence and the insulin flows (determined by the nurse) that were effectively administered to the patient. The contribution of this paper is the development of an MPC for glycemia control in the Intensive Care Unit (ICU). The penalty index, which is a specific concept for quantitative analysis of glycemia control in the ICU, is also proposed. The results of the developed MPC are satisfactory both in terms of control behavior (reference tracking and the suppression of unknown disturbance factors) and clinical acceptability.
本文提出了一种基于模型的预测控制器(MPC),用于危重患者的血糖控制。一个专门用来描述这些患者的葡萄糖和胰岛素动态的模型,对每个患者进行估计,并在获得新的测量结果时重新估计。对来自19名危重患者的真实数据集进行了定量和定性分析。在第一个分析中,假设施加每小时一次或每四小时一次的胰岛素适应频率,对MPC的稳健性进行了测试。第二个分析的特点是MPC胰岛素输注顺序和胰岛素流量(由护士确定)之间的比较,有效地给病人。本文的贡献是在重症监护病房(ICU)的血糖控制MPC的发展。并提出了惩罚指数这一定量分析ICU血糖控制的具体概念。开发的MPC在控制行为(参考文献跟踪和抑制未知干扰因素)和临床可接受性方面的结果都令人满意。
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引用次数: 15
Anti-windup applied to adaptive rejection of unknown narrow band disturbances 抗上锁应用于自适应抑制未知窄带干扰
Pub Date : 2007-07-02 DOI: 10.23919/ECC.2007.7068908
L. Pagnotta, L. Zaccarian, A. Constantinescu, S. Galeani
In this paper, a discrete-time anti-windup augmentation scheme is applied to a model of an active suspension system. The model faithfully reproduces the dynamics of an experimental setup available at the Laboratoire d'Automatique de Grenoble and provided by the Hutchinson Research Center. The underlying control system is an adaptive scheme achieving rejection of unknown narrow band disturbances by acting on a piston with the ultimate goal of reducing the resid- ual force on the top of the suspension. Since the piston is subject to magnitude saturation, the control system is prone to windup effects and experiences severe performance loss when large disturbances affect the suspension. The discrete- time anti-windup scheme, consisting in a copy of the plant that augments the controller dynamics, allows to partially recover the unconstrained performance and induces desirable responses for disturbances of different sizes: from very large to very small. Simulation results are reported to illustrate the effectiveness of the anti-windup solution.
本文将一种离散时间抗上卷增强方案应用于主动悬架系统模型。该模型忠实地再现了格勒诺布尔自动化实验室(Laboratoire d’automatique de Grenoble)由哈钦森研究中心提供的实验装置的动力学。底层控制系统是一种自适应方案,通过作用于活塞来实现对未知窄带干扰的抑制,最终目标是减少悬架顶部的剩余力。由于活塞受到幅度饱和的影响,当大的扰动影响悬架时,控制系统容易产生上卷效应,并经历严重的性能损失。离散时间反上弦方案,包括一个增加控制器动力学的装置副本,允许部分恢复无约束性能,并诱导不同大小的干扰的理想响应:从非常大到非常小。仿真结果验证了该解决方案的有效性。
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引用次数: 4
A nested computational approach for l2 optimization of regulation transients in discrete-time linear parameter varying systems 离散线性变参数系统调节暂态l2优化的嵌套计算方法
Pub Date : 2007-07-02 DOI: 10.23919/ECC.2007.7068630
G. Marro, E. Zattoni
This work deals with the optimization, expressed as the minimization of the l2 norm of the tracking error, of regulation transients caused by instantaneous, wide parameter variations occurring in discrete-time linear systems. The regulated system switching law is assumed to be completely known a priori. A feedback regulator, designed according to the internal model principle, guarantees closed-loop asymptotic stability and zero error in the steady-state condition. The compensation scheme for the minimization of transients includes a feedforward action on both the plant and the feedback regulator and a switching policy for the states of the exosystem and the feedback regulator. The feedfoward action and the state switching policy are computed off-line, by means of a two-level nested algorithm. The lower level includes a sequence of finite-horizon optimal control problems (each one corresponding to a time interval between two subsequent switches), while the upper level combines relevant data from the lower-level problems into a global l2 optimization problem. A substantial feature of this contribution is that the approach to the lower-level problem relies on an original procedure which provides the solution of a discrete-time finite-horizon optimal control problem in closed form as a function of time. Thus, discrete-time intervals with a large number of samples can easily be handled.
这项工作涉及的优化,表示为跟踪误差的l2范数的最小化,在离散时间线性系统中发生的瞬时,宽参数变化引起的调节瞬态。被调节系统的切换律被假定为完全先验已知。根据内模原理设计的反馈调节器保证了系统的闭环渐近稳定性和稳态条件下的零误差。瞬态最小化的补偿方案包括对植物和反馈调节器的前馈作用,以及对外系统和反馈调节器状态的切换策略。采用两级嵌套算法离线计算前馈动作和状态切换策略。较低的层次包括一系列有限水平最优控制问题(每个问题对应于两个后续开关之间的时间间隔),而较高的层次将较低层次问题的相关数据组合成一个全局l2优化问题。这一贡献的一个重要特点是,解决低级问题的方法依赖于一个原始程序,该程序以时间函数的封闭形式提供离散时间有限视界最优控制问题的解。因此,具有大量样本的离散时间间隔可以很容易地处理。
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引用次数: 2
Position control of a manipulator with one flexible link 单柔性连杆机械手的位置控制
Pub Date : 2007-07-02 DOI: 10.23919/ECC.2007.7068693
J. Martins, Alexandre N. Paris, J. Sá da Costa
Flexible link manipulators are characterized by a low tip positioning precision due to vibration. To overcome this problem, in this work we implement control schemes that combine feedback control with feedforward control. The use of feedback control of the tip position to reduce the tip vibration typically suffers from non-minimum phase related problems. Therefore, we use feedback control just for joint angle control while the vibration of the end-effector is reduced with feedforward control. Two feedback controllers have been implemented and compared: feedback linearization and sliding mode control. For the feedforward control we use filtering techniques and the input shaping technique. The controllers were tested experimentally on a two joint planar manipulator with a flexible link.
柔性连杆机械臂的特点是由于振动导致末端定位精度低。为了克服这个问题,在这项工作中,我们实现了将反馈控制与前馈控制相结合的控制方案。使用反馈控制的尖端位置,以减少尖端振动通常遭受非最小相位相关的问题。因此,我们只对关节角度进行反馈控制,而对末端执行器进行前馈控制以减小其振动。对两种反馈控制器进行了实现和比较:反馈线性化和滑模控制。对于前馈控制,我们使用滤波技术和输入整形技术。在一个平面柔性连杆双关节机械臂上对所设计的控制器进行了实验验证。
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引用次数: 0
期刊
2007 European Control Conference (ECC)
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