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Proceedings of the 40th IEEE Conference on Decision and Control (Cat. No.01CH37228)最新文献

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Quantum control of electrons in semiconductor nanostructures using spatially uniform electric fields 利用空间均匀电场对半导体纳米结构中的电子进行量子控制
P. I. Tamborenea, H. Metiu
We have studied quantum control operations on electrons confined in semiconductor nanostructures using time-dependent spatially uniform electric fields. Our general goal was to manipulate the wave function of one or two electrons and thereby control a certain quantum probability of interest. Since our main interest was in performing certain tasks rather than in developing efficient control methods, we searched relevant parts of our parameter space numerically in a systematic manner. Here we summarize the results of three studies whose common denominator is the fact that the control of the wave function is performed using a uniform electric field, or, in other words, through the electric dipole approximation Hamiltonian H/sub d/= -er/spl middot/E(t). The subjects of these studies are: Coherent control of multisubband wavepackets with terahertz pulses, single-electron turnstile modelled with two interacting electrons, and dynamical localization of two interacting electrons in coupled quantum dots.
我们利用随时间变化的空间均匀电场研究了半导体纳米结构中电子的量子控制操作。我们的总体目标是操纵一个或两个电子的波函数,从而控制某个感兴趣的量子概率。由于我们的主要兴趣是执行某些任务,而不是开发有效的控制方法,因此我们以系统的方式对参数空间的相关部分进行了数值搜索。在这里,我们总结了三个研究的结果,它们的共同点是使用均匀电场来控制波函数,或者换句话说,通过电偶极子近似哈密顿量H/sub d/= -er/spl middot/E(t)。这些研究的主题是:用太赫兹脉冲的多子带波包的相干控制,用两个相互作用的电子建模的单电子旋转门,以及耦合量子点中两个相互作用的电子的动态定位。
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引用次数: 2
Systematic synthesis of nano- and micro-electromechanical systems 纳微机电系统的系统综合
S. Lyshevski, M. Lyshevski
Addresses and solves model development, simulation, analysis, control, and optimization problems which are critical in synthesis and design of high-performance NEMS and MEMS. It is illustrated that different concepts can be applied in modeling, and novel approaches must be developed in order to guarantee feasibility and applicability of mathematical models for consecutive steps, tasks, and problems. To analyze molecular dynamics and study nanostructures, high-fidelity modeling is approached using the three-dimensional charge density. For electromechanical devices, Maxwell's equations can be used. The lumped-parameter models, which lead to nonlinear differential equations, are applied in the preliminary analysis and design. It is illustrated that three-dimensional in the time domain high-fidelity modeling, simulation, and analysis can be achieved. To demonstrate the results, an illustrative example is provided. In particular, rotational micromotors are studied, modeled, controlled, and tested.
解决模型开发、仿真、分析、控制和优化问题,这些问题在高性能NEMS和MEMS的合成和设计中至关重要。在建模中可以应用不同的概念,必须开发新的方法,以保证数学模型对连续步骤、任务和问题的可行性和适用性。为了分析分子动力学和研究纳米结构,采用三维电荷密度进行高保真建模。对于机电设备,可以使用麦克斯韦方程组。在初步的分析和设计中应用了集总参数模型,得到了非线性微分方程。结果表明,在时域内可以实现三维高保真建模、仿真和分析。为了证明结果,给出了一个说明性的例子。特别是,旋转微电机的研究,建模,控制和测试。
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引用次数: 0
Tracking variable periodic signals with fixed sampling rate 用固定采样率跟踪变周期信号
Z. Cao, G. Ledwich
Research has, shown that the repetitive control is very efficient in tracking periodic signals. However, the existing repetitive control algorithms require an integer number of samples in each period. In some industry applications where the signal period varies but other requirements on the data acquisition system force a fixed sample rate, the number of samples per period may be a non-integer. To address this problem, the paper presents an adaptive repetitive control, consisting of two portions, the repetitive controller and the nominal controller. The repetitive controller uses a fictitious sampler operating at a variable sample rate maintained at multiple times of the signal frequency, while the nominal controller uses a fixed sampling rate. Interpolations are utilised to generate the fictitious samples required for the repetitive learning. The variation of the repetitive controller's sampling rate is limited to a small value, so that the system stability can be maintained without any changes on the controller parameters. The experimental results on the control of a servomotor demonstrate the effectiveness of the proposed schemes.
研究表明,重复控制在跟踪周期信号方面是非常有效的。然而,现有的重复控制算法要求每个周期的样本数量为整数。在某些工业应用中,信号周期变化,但数据采集系统的其他要求强制固定采样率,每个周期的采样数可能是非整数。为了解决这一问题,本文提出了一种自适应重复控制,它由重复控制器和标称控制器两部分组成。重复控制器使用一个虚构的采样器,以保持在信号频率的数倍的可变采样率工作,而标称控制器使用固定采样率。插值用于生成重复学习所需的虚拟样本。重复控制器的采样率的变化被限制在一个很小的值,这样可以在不改变控制器参数的情况下保持系统的稳定性。在伺服电机控制上的实验结果验证了所提方案的有效性。
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引用次数: 20
Fluid dynamical systems as Hamiltonian boundary control systems 作为哈密顿边界控制系统的流体动力系统
A. Schaft, B. Maschke
It is shown how the geometric framework for distributed-parameter port-controlled Hamiltonian systems can be adapted to formulate ideal isentropic compressible fluids with nonzero energy flow through the boundary of the spatial domain as Hamiltonian boundary control systems. The key ingredient is the modification of the Stokes-Dirac structure to a Dirac structure defined on the space of mass density 3-forms and velocity 1-forms, incorporating three-dimensional convection. Some initial steps towards stabilization of these boundary control systems, based on the generation of Casimir functions for the closed-loop Hamiltonian system, are discussed.
展示了如何将分布参数端口控制哈密顿系统的几何框架用于将具有非零能量的理想等熵可压缩流体作为哈密顿边界控制系统流过空间域的边界。关键是将Stokes-Dirac结构修改为定义在质量密度3-form和速度1-form空间上的Dirac结构,并包含三维对流。基于闭环哈密顿系统的卡西米尔函数的生成,讨论了这些边界控制系统趋于稳定的一些初步步骤。
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引用次数: 33
Model predictive control for perturbed max-plus-linear systems: a stochastic approach 扰动最大加线性系统的模型预测控制:一种随机方法
T. Boom, B. Schutter
Model predictive control (MPC) is a popular controller design technique in the process industry. Conventional MPC uses linear or nonlinear discrete-time models. Previously, we (2001) have extended MPC to a class of discrete event systems that can be described by a model that is "linear" in the (max, +) algebra. In our previous work we have only considered MPC for the perturbations-free case and for the case with bounded noise and/or modeling errors. We extend our previous results on MPC for perturbed max-plus-linear systems to a stochastic setting. We show that under quite general conditions the resulting optimization problems turn out to be convex and can be solved very efficiently.
模型预测控制(MPC)是过程工业中一种流行的控制器设计技术。传统的MPC使用线性或非线性离散时间模型。以前,我们(2001)已经将MPC扩展到一类离散事件系统,这些系统可以用(max, +)代数中的“线性”模型来描述。在我们以前的工作中,我们只考虑了无扰动情况和有界噪声和/或建模误差情况下的MPC。我们将先前关于扰动最大加线性系统的MPC的结果推广到随机设置。我们证明,在相当一般的条件下,所得到的优化问题是凸的,可以非常有效地解决。
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引用次数: 50
On the observability properties of a class of 2D discrete linear systems 一类二维离散线性系统的可观测性
M. Dymkov, I. Gaishun, E. Rogers, K. Gałkowski, D. Owens
Repetitive processes are a distinct class of 2D systems of both theoretical and applications interest. They arise, for example, in the modeling of industrial processes such as long-wall coal cutting and are the essential starting point for the study of classes of linear iterative learning control schemes. The development of a 'mature' systems theory for these processes is the subject of the paper. In particular, a Volterra operator setting is used to produce the first significant results on an observability theory for so-called discrete linear repetitive processes which are of particular interest in a number of areas, e.g. the modeling and analysis of a wide class of linear iterative learning control schemes.
重复过程是二维系统的一个独特类别,具有理论和应用价值。例如,它们出现在诸如长壁煤切割等工业过程的建模中,并且是研究线性迭代学习控制方案的基本起点。为这些过程发展一个“成熟”的系统理论是本文的主题。特别是,Volterra算子设置用于产生所谓的离散线性重复过程的可观测性理论的第一个重要结果,该理论在许多领域特别感兴趣,例如,对各种线性迭代学习控制方案的建模和分析。
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引用次数: 4
Adaptive error control for mobile networks: on-line optimization based on a single sample path 移动网络的自适应误差控制:基于单样本路径的在线优化
M. He, Xi-Ren Cao
Link layer error control is one of the important technologies in mobile systems. In this paper, adaptive error control investigated using a modified Markov decision process (MDP) model is discussed. An adaptive error control strategy, where the MAC frame length adapts to the varying channel condition, was developed. The proposed algorithm implemented online, achieves better average link layer throughput in a dynamic data channel. The simulation example provided shows that the algorithm can improve the throughput of the wireless data channel by 23%.
链路层误差控制是移动通信系统中的一项重要技术。本文讨论了一种改进的马尔可夫决策过程模型的自适应误差控制问题。提出了一种自适应错误控制策略,使MAC帧长度随信道条件的变化而变化。该算法在线实现,在动态数据通道中获得了更好的平均链路层吞吐量。仿真实例表明,该算法可使无线数据信道的吞吐量提高23%。
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引用次数: 0
Some results on adaptive tracking for a class of nonlinear time-delay systems 一类非线性时滞系统自适应跟踪的一些结果
P. Pepe
The tracking control problem is addressed for a class of nonlinear delay systems with unknown parameters. Such a problem is solved in the case that the nonlinear delay system has some geometrical properties, that is full delay relative degree and no unstable internal dynamics when the output and its derivatives are taken bounded by the control law. It is supposed moreover that the unknown parameters do not affect the output and its derivatives until n-1, where n is the dimension of the state Euclidean vector. As usual, the control law here found depends on the state variables in present and past times, and on the control law itself in past times too. Standard Lyapunov methodology is here used to-find out the adaptive control law and the dynamics of estimated parameters. It is proved that when the found out control law is applied to the system, the tracking error asymptotically goes to zero. The case of unknown delay is considered too. An upper bound for the error in delay knowledge is found which can be tolerated when controlling the system by recent methodologies based on standard nonlinear analysis. Simulation results are here shown for a prey-predator Lotka Volterra system.
研究了一类参数未知的非线性时滞系统的跟踪控制问题。当非线性时滞系统的输出及其导数在控制律有界的条件下,具有一定的几何性质,即具有完全的相对时滞度,且不存在不稳定的内部动力学时,就解决了这一问题。此外,假设未知参数在n-1之前不会影响输出及其导数,其中n是状态欧几里德向量的维数。通常,这里发现的控制律取决于现在和过去时间的状态变量,也取决于过去时间的控制律本身。本文采用标准李雅普诺夫方法求解自适应控制律和估计参数的动态特性。证明了当所发现的控制律应用于系统时,跟踪误差渐近趋近于零。还考虑了未知延迟的情况。在基于标准非线性分析的最新方法控制系统时,找到了延迟知识误差的上界。仿真结果显示了一个猎物-捕食者Lotka Volterra系统。
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引用次数: 9
Chattering analysis in sliding mode systems with inertial sensors 含惯性传感器的滑模系统的抖振分析
L. Fridman
Singularly-perturbed relay control systems with 2nd-order sliding modes (SP2SM) are considered for modeling sliding-mode control systems with inertial sensors. It is shown that the asymptotically stable slow-motions integral manifold (ASSMIM) of a smooth singularly-perturbed system, describing the motion of the original SP2SM in the 2nd-order sliding domain, is the ASSMIM of the original SP2SM. For sliding-mode control systems with inertial sensors, sufficient conditions for the exponentially decreasing amplitude of chattering and the unlimited growth of frequency are found. A formula for the asymptotic representation of "ideal" switching surface oscillations is suggested for sliding-mode systems with inertial sensors.
考虑了二阶滑模奇异摄动继电器控制系统的建模问题。证明了描述原SP2SM在二阶滑动域中运动的光滑奇摄动系统的渐近稳定慢运动积分流形(ASSMIM)是原SP2SM的渐近稳定慢运动积分流形。对于具有惯性传感器的滑模控制系统,得到了抖振幅值呈指数递减和频率无限增长的充分条件。对于具有惯性传感器的滑模系统,提出了“理想”切换面振荡的渐近表示公式。
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引用次数: 151
Counter-example to ad-hoc off-equilibrium linearisation methods in gain-scheduling 增益调度中非平衡线性化方法的反例
P. Korba, H. Werner
The paper addresses multiple local-linear model structures for control. Improvements in gain scheduling through local linear modelling without offset terms (LPV), and a subsequent controller design based on linear matrix inequalities (LMIs) over a popular ad hoc approach are shown using an example published in recent journals.
本文讨论了用于控制的多个局部线性模型结构。通过无偏移项的局部线性建模(LPV)改进增益调度,以及基于线性矩阵不等式(lmi)的后续控制器设计,通过最近发表在期刊上的一个例子展示了一种流行的临时方法。
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引用次数: 4
期刊
Proceedings of the 40th IEEE Conference on Decision and Control (Cat. No.01CH37228)
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