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Data-Driven Composite Nonlinear Feedback Control for Semi-Global Output Regulation of Unknown Linear Systems With Input Saturation 输入饱和未知线性系统半全局输出调节的数据驱动复合非线性反馈控制
IF 2.4 Q2 AUTOMATION & CONTROL SYSTEMS Pub Date : 2024-12-26 DOI: 10.1109/LCSYS.2024.3523244
Hanwen Cai;Weiyao Lan;Xiao Yu
This letter addresses the semi-global output regulation problem for continuous-time linear systems with input saturation and unknown dynamics. First, we employ a low-gain technique to design a state-feedback linear control law such that the control input operates within the linear region of the actuator. Then, taking it as the linear part, we construct a composite nonlinear feedback (CNF) control law, consisting of both linear and nonlinear parts, to improve the transient performance of the closed-loop system. Without requiring prior knowledge of the system dynamics or an initial stabilizing control policy, we propose a novel adaptive dynamic programming (ADP) learning algorithm. This algorithm learns both the linear part and the nonlinear part of the CNF control law using the same set of data. In addition, the algorithm uses single-layer filters, eliminating the need for integral operations during the learning process. Finally, the effectiveness of the proposed algorithm is demonstrated by an illustrative example.
本文研究具有输入饱和和未知动态的连续线性系统的半全局输出调节问题。首先,我们采用低增益技术设计状态反馈线性控制律,使控制输入在执行器的线性区域内工作。然后,以其为线性部分,构造由线性部分和非线性部分组成的复合非线性反馈(CNF)控制律,以改善闭环系统的暂态性能。我们提出了一种新的自适应动态规划(ADP)学习算法,而不需要事先了解系统动力学或初始稳定控制策略。该算法使用同一组数据学习CNF控制律的线性部分和非线性部分。此外,该算法采用单层滤波器,省去了学习过程中的积分运算。最后,通过一个算例验证了该算法的有效性。
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引用次数: 0
Orthogonal Modal Representation in Long-Term Risk Quantification for Dynamic Multi-Agent Systems 动态多智能体系统长期风险量化中的正交模态表示
IF 2.4 Q2 AUTOMATION & CONTROL SYSTEMS Pub Date : 2024-12-26 DOI: 10.1109/LCSYS.2024.3522949
Ryoma Yasunaga;Yorie Nakahira;Yutaka Hori
Quantifying long-term risk in large-scale multi-agent systems is critical for ensuring safe operation. However, the high dimensionality of these systems and the rarity of risk events can make the required computations prohibitively expensive. To overcome this challenge, we introduce a graph-based representation and efficient risk quantification techniques tailored for stochastic multi-agent systems. A key technical innovation is a systematic approach to decompose the estimation problem of system-wide safety probabilities into smaller, lower-dimensional sub-systems with sub-safe sets. This decomposition leverages the graph Fourier basis of the agent interaction network, providing a natural and scalable representation. The safety probabilities for these sub-systems are derived as solutions to a set of low-dimensional partial differential equations (PDEs). The proposed decomposition enables existing risk quantification approaches but does so without an exponential increase in computational complexity with respect to the number of agents.
大规模多智能体系统的长期风险量化是保证系统安全运行的关键。然而,这些系统的高维性和风险事件的稀缺性可能会使所需的计算成本过高。为了克服这一挑战,我们引入了为随机多智能体系统量身定制的基于图的表示和有效的风险量化技术。一个关键的技术创新是系统地将全系统安全概率的估计问题分解为具有子安全集的更小、更低维的子系统。这种分解利用了代理交互网络的傅立叶图基础,提供了一种自然的、可扩展的表示。这些子系统的安全概率被导出为一组低维偏微分方程(PDEs)的解。所提出的分解使现有的风险量化方法成为可能,但这样做不会使计算复杂性相对于代理数量呈指数增长。
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引用次数: 0
Active Learning-Based Control for Resiliency of Uncertain Systems Under DoS Attacks 基于主动学习的不确定系统DoS攻击弹性控制
IF 2.4 Q2 AUTOMATION & CONTROL SYSTEMS Pub Date : 2024-12-26 DOI: 10.1109/LCSYS.2024.3522953
Sayan Chakraborty;Weinan Gao;Kyriakos G. Vamvoudakis;Zhong-Ping Jiang
In this letter, we present an active learning-based control method for discrete-time linear systems with unknown parameters under denial-of-service (DoS) attacks. For any DoS duration parameter, using switching systems theory and adaptive dynamic programming, an active learning-based control technique is developed. A critical DoS average dwell-time is learned from online input-state data, guaranteeing stability of the equilibrium point of the closed-loop system in the presence of DoS attacks with average dwell-time greater than or equal to the critical DoS average dwell-time. The effectiveness of the proposed methodology is illustrated via a numerical example.
在这封信中,我们提出了一种基于主动学习的控制方法,用于在拒绝服务(DoS)攻击下具有未知参数的离散时间线性系统。针对任意DoS持续时间参数,利用切换系统理论和自适应动态规划,提出了一种基于主动学习的控制方法。从在线输入状态数据中学习临界DoS平均驻留时间,保证了在平均驻留时间大于等于临界DoS平均驻留时间的DoS攻击下闭环系统平衡点的稳定性。通过一个算例说明了所提方法的有效性。
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引用次数: 0
Projected Forward Gradient-Guided Frank-Wolfe Algorithm via Variance Reduction 基于方差缩减的投影前向梯度引导Frank-Wolfe算法
IF 2.4 Q2 AUTOMATION & CONTROL SYSTEMS Pub Date : 2024-12-26 DOI: 10.1109/LCSYS.2024.3523243
Mohammadreza Rostami;Solmaz S. Kia
This letter aims to enhance the use of the Frank-Wolfe (FW) algorithm for training deep neural networks. Similar to any gradient-based optimization algorithm, FW suffers from high computational and memory costs when computing gradients for DNNs. This letter introduces the application of the recently proposed projected forward gradient (Projected-FG) method to the FW framework, offering reduced computational cost similar to backpropagation and low memory utilization akin to forward propagation. Our results show that trivial application of the Projected-FG introduces non-vanishing convergence error due to the stochastic noise that the Projected-FG method introduces in the process. This noise results in an non-vanishing variance in the Projected-FG estimated gradient. To address this, we propose a variance reduction approach by aggregating historical Projected-FG directions. We demonstrate rigorously that this approach ensures convergence to the optimal solution for convex functions and to a stationary point for non-convex functions. Simulations demonstrate our results.
这封信的目的是加强使用Frank-Wolfe (FW)算法来训练深度神经网络。与任何基于梯度的优化算法一样,FW在计算dnn的梯度时需要耗费大量的计算和内存。这封信介绍了最近提出的投影前向梯度(投影- fg)方法在FW框架中的应用,它提供了类似于反向传播的更低的计算成本和类似于前向传播的低内存利用率。我们的结果表明,由于投影- fg方法在过程中引入的随机噪声,投影- fg方法的平凡应用会引入非消失收敛误差。这种噪声导致投影- fg估计梯度的方差不消失。为了解决这个问题,我们提出了一种通过汇总历史project - fg方向来减少方差的方法。我们严格地证明了这种方法确保收敛到凸函数的最优解和非凸函数的平稳点。仿真验证了我们的结果。
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引用次数: 0
Stochastic Data-Driven Predictive Control: Chance-Constraint Satisfaction With Identified Multi-Step Predictors 随机数据驱动的预测控制:识别多步预测器的机会约束满足
IF 2.4 Q2 AUTOMATION & CONTROL SYSTEMS Pub Date : 2024-12-26 DOI: 10.1109/LCSYS.2024.3523238
Haldun Balim;Andrea Carron;Melanie N. Zeilinger;Johannes Köhler
We propose a novel data-driven stochastic model predictive control framework for uncertain linear systems with noisy output measurements. Our approach leverages multi-step predictors to efficiently propagate uncertainty, ensuring chance constraint satisfaction. In particular, we present a strategy to identify multi-step predictors and quantify the associated uncertainty using a surrogate (data-driven) state space model. Then, we utilize the derived distribution to formulate a constraint tightening that ensures chance constraint satisfaction despite the parametric uncertainty. A numerical example highlights the reduced conservatism of handling parametric uncertainty in the proposed method compared to state-of-the-art solutions.
针对具有噪声输出的不确定线性系统,提出了一种新的数据驱动随机模型预测控制框架。我们的方法利用多步预测器来有效地传播不确定性,确保机会约束的满足。特别是,我们提出了一种策略来识别多步预测器,并使用代理(数据驱动)状态空间模型量化相关的不确定性。然后,我们利用推导出的分布来制定约束收紧,在参数不确定的情况下保证机会约束的满足。一个数值例子表明,与现有的解决方案相比,所提出的方法在处理参数不确定性方面的保守性降低了。
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引用次数: 0
Closed-Loop Analysis of ADMM-Based Suboptimal Linear Model Predictive Control 基于admm的次优线性模型预测控制闭环分析
IF 2.4 Q2 AUTOMATION & CONTROL SYSTEMS Pub Date : 2024-12-26 DOI: 10.1109/LCSYS.2024.3523241
Anusha Srikanthan;Aren Karapetyan;Vijay Kumar;Nikolai Matni
Many practical applications of optimal control are subject to real-time computational constraints. When applying model predictive control (MPC) in these settings, respecting timing constraints is achieved by limiting the number of iterations of the optimization algorithm used to compute control actions at each time step, resulting in so-called suboptimal MPC. This letter proposes a suboptimal MPC scheme based on the alternating direction method of multipliers (ADMM). With a focus on the linear quadratic regulator problem with state and input constraints, we show how ADMM can be used to split the MPC problem into iterative updates of an unconstrained optimal control problem (with an analytical solution), and a dynamics-free feasibility step. We show that using a warm-start approach combined with enough iterations per time-step, yields an ADMM-based suboptimal MPC scheme which asymptotically stabilizes the system and maintains recursive feasibility.
最优控制的许多实际应用都受到实时计算约束。当在这些设置中应用模型预测控制(MPC)时,尊重时间约束是通过限制用于在每个时间步计算控制动作的优化算法的迭代次数来实现的,从而导致所谓的次优MPC。本文提出一种基于乘法器交替方向法(ADMM)的次优MPC方案。重点关注具有状态和输入约束的线性二次调节器问题,我们展示了如何使用ADMM将MPC问题分解为无约束最优控制问题(含解析解)的迭代更新和无动态可行性步骤。我们证明了使用热启动方法结合每个时间步长足够的迭代,产生了基于admm的次优MPC方案,该方案使系统渐近稳定并保持递归可行性。
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引用次数: 0
Coactive Preference-Guided Multi-Objective Bayesian Optimization: An Application to Policy Learning in Personalized Plasma Medicine 协同偏好导向的多目标贝叶斯优化:在个性化血浆医疗政策学习中的应用
IF 2.4 Q2 AUTOMATION & CONTROL SYSTEMS Pub Date : 2024-12-25 DOI: 10.1109/LCSYS.2024.3521965
Ketong Shao;Ankush Chakrabarty;Ali Mesbah;Diego Romeres
The design of advanced learning- and optimization-based controllers requires selecting parameters that balance performance objectives and constraints. Bayesian optimization (BO) has proven effective for resource-efficient calibration of such controllers. Preference-guided BO incorporates user preferences to prioritize areas of interest, but it lacks a mechanism for users to specify desired outcomes directly. This letter introduces a user-centric framework for preference-guided BO, leveraging a novel knowledge-gradient based coactive acquisition function that allows users not only to select preferred outcomes but also also propose alternatives to guide exploration. To enable efficient implementation, we approximate the acquisition function, avoiding costly bilevel optimization. The approach is validated for control policy adaptation in personalized plasma medicine, where it outperforms standard preference-guided BO by effectively integrating user feedback to personalize treatment protocol.
基于高级学习和优化的控制器的设计需要选择平衡性能目标和约束的参数。贝叶斯优化(BO)已被证明是一种有效的资源高效标定方法。偏好导向的BO结合了用户偏好来确定感兴趣领域的优先级,但它缺乏使用户直接指定期望结果的机制。这封信介绍了一个以用户为中心的偏好导向BO框架,利用一种新颖的基于知识梯度的协同获取功能,使用户不仅可以选择首选结果,还可以提出指导探索的替代方案。为了实现高效,我们近似获取函数,避免代价高昂的双层优化。该方法在个性化血浆医学的控制策略适应中得到了验证,通过有效地将用户反馈整合到个性化治疗方案中,它优于标准的偏好导向BO。
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引用次数: 0
Computationally Efficient Dual Mode Model Predictive Control to Ensure Safe Charging of Lithium-Ion Batteries 保证锂离子电池安全充电的计算高效双模模型预测控制
IF 2.4 Q2 AUTOMATION & CONTROL SYSTEMS Pub Date : 2024-12-23 DOI: 10.1109/LCSYS.2024.3522217
Suchita Undare;Kiana Karami;M. Scott Trimboli
Model predictive control (MPC) has emerged as a promising strategy for the control of lithium-ion batteries due mainly to its capability for real-time constraint handling. However, classical implementations of MPC cannot guarantee stability, thus limiting its practical application. In addition, classical linear MPC relies on the computation of a constrained quadratic program at every time step, the computation of which may become burdensome when long horizons and numerous constraints are involved. The present paper applies a “dual mode” variation of MPC which reduces the necessity of implementing a quadratic program and provides assured stability of operation, at the cost of introducing a degree of conservatism.
模型预测控制(MPC)已成为锂离子电池控制的一种有前途的策略,主要是因为它具有实时约束处理的能力。然而,传统的MPC实现不能保证稳定性,从而限制了其实际应用。此外,经典的线性MPC在每个时间步都依赖于一个有约束的二次规划的计算,当涉及到长视界和众多约束时,计算会变得非常繁重。本文采用MPC的“双模式”变化,减少了实现二次规划的必要性,并以引入一定程度的保守性为代价,提供了保证的运行稳定性。
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引用次数: 0
Parameter Identifiability and Reduction for Smooth and Nonsmooth Differential-Algebraic Equation Systems 光滑与非光滑微分代数方程组的参数可辨识性与约简
IF 2.4 Q2 AUTOMATION & CONTROL SYSTEMS Pub Date : 2024-12-23 DOI: 10.1109/LCSYS.2024.3521427
Hesham Abdelfattah;Peter Stechlinski;Sameh A. Eisa
We extend the sensitivity rank condition (SERC), which tests for identifiability of smooth input-output systems, to a broader class of systems. Particularly, we build on our recently developed lexicographic SERC (L-SERC) theory and methods to achieve an identifiability test for differential-algebraic equation (DAE) systems for the first time, including nonsmooth systems. Additionally, we develop a method to determine the identifiable and non-identifiable parameter sets. We show how this new theory can be used to establish a (non-local) parameter reduction procedure and we show how parameter estimation problems can be solved. We apply the new methods to problems in wind turbine power systems and glucose-insulin kinetics.
我们将测试光滑输入输出系统可辨识性的灵敏度等级条件(SERC)扩展到更广泛的系统类别。特别是,我们建立在我们最近开发的词典SERC (L-SERC)理论和方法的基础上,首次实现了微分代数方程(DAE)系统的可识别性测试,包括非光滑系统。此外,我们还开发了一种确定可识别和不可识别参数集的方法。我们展示了如何使用这个新理论来建立一个(非局部)参数约简过程,并展示了如何解决参数估计问题。我们将新方法应用于风力发电系统和葡萄糖-胰岛素动力学问题。
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引用次数: 0
On the Stability of Consensus Control Under Rotational Ambiguities 旋转模糊条件下共识控制的稳定性
IF 2.4 Q2 AUTOMATION & CONTROL SYSTEMS Pub Date : 2024-12-23 DOI: 10.1109/LCSYS.2024.3521358
Zhonggang Li;Changheng Li;Raj Thilak Rajan
Consensus control of multiagent systems arises in various applications such as rendezvous and formation control. The input to these algorithms, e.g., the (relative) positions of neighboring agents need to be measured using various sensors. Recent works aim to reconstruct these positions, i.e., achieve localization using Euclidean distance measurements instead of displacements, for cost efficiency and scalability. However, this approach inherently introduces ambiguities, such as a rotation or a reflection, which can cause stability issues in practice without corrections by some anchors. In this letter, we conduct a thorough analysis of the stability of consensus control in the presence of localization-induced rotational ambiguities, in several scenarios including, e.g., proper and improper rotation, and the homogeneity of rotations. We give stability criteria and stability margin on the rotations, which are numerically verified with two traditional examples of consensus control.
多智能体系统的共识控制在交会控制和编队控制等多种应用中都有出现。这些算法的输入,例如,相邻代理的(相对)位置需要使用各种传感器进行测量。最近的工作旨在重建这些位置,即使用欧几里得距离测量而不是位移来实现定位,以提高成本效率和可扩展性。然而,这种方法固有地引入了模糊性,例如旋转或反射,这可能在实践中导致稳定性问题,而不需要某些锚点进行修正。在这封信中,我们对存在定位引起的旋转歧义的共识控制的稳定性进行了彻底的分析,包括几种情况,例如,适当和不适当的旋转,以及旋转的均匀性。给出了旋转的稳定性准则和稳定裕度,并用两个传统的共识控制实例对其进行了数值验证。
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引用次数: 0
期刊
IEEE Control Systems Letters
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