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2022 American Control Conference (ACC)最新文献

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The importance of randomization in resource assignment problems 随机化在资源分配问题中的重要性
Pub Date : 2022-06-08 DOI: 10.23919/ACC53348.2022.9867373
Keith Paarporn, R. Chandan, M. Alizadeh, Jason R. Marden
In this paper, we consider problems involving a central commander that must assign a pool of available resources to two separate competitions. In each competition, a sub-colonel allocates its endowed resources from the assignment against an opponent. We consider General Lotto games as the underlying model of competition. Here, we also take into account that the commander’s randomized resource assignments cause the opponents to have uncertainty about the sub-commanders’ actual assigned endowments. We find that randomized assignments, which induce General Lotto games of incomplete and asymmetric information in the component competitions, do not offer strategic advantages over deterministic ones when the opponents have fixed resource endowments. However, this is not the case when the opponents have per-unit costs to utilize resources. We find the optimal randomized assignment strategy can actually improve the commander’s payoff two-fold when compared to optimal deterministic assignments.
在本文中,我们考虑的问题涉及一个必须将可用资源池分配给两个独立竞争的中央指挥官。在每一场比赛中,副上校分配分配给他的资源来对抗对手。我们认为通用乐透游戏是竞争的基本模式。在这里,我们还考虑到指挥官的随机资源分配导致对手对副指挥官的实际分配禀赋有不确定性。研究发现,当对手资源禀赋固定时,随机分配并不比确定性分配具有战略优势。随机分配在组件竞争中诱导了信息不完全和不对称的一般乐托博弈。然而,当对手利用资源的单位成本时,情况就不同了。我们发现,与最优确定性分配相比,最优随机分配策略实际上可以使指挥官的收益提高两倍。
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引用次数: 0
Estimation and Control for Collective Motion with Intermittent Locomotion 间歇运动集体运动的估计与控制
Pub Date : 2022-06-08 DOI: 10.23919/ACC53348.2022.9867313
A. A. Thompson, Leela Cañuelas, D. Paley
Inspired by the periodic swimming of many fish species, this paper presents a dynamic model of self-propelled particles with a periodic controller. The dynamics are split into a burst phase during which each particle applies a control input and a coast phase during which each particle performs state estimation. Using a closed-loop heading controller and a linear observer, we evaluate conditions that stabilize the equilibrium points for a single particle and for multiple particles using noise-free state feedback or output feedback. Practical stability bounds are evaluated for a single particle with bounded actuator noise with state feedback and bounded sensor noise with output feedback.
受多种鱼类周期性游动的启发,提出了一种带有周期控制器的自游动粒子动力学模型。动力学被分为突发阶段和海岸阶段,在此期间每个粒子应用一个控制输入,在此期间每个粒子执行状态估计。使用闭环航向控制器和线性观测器,我们评估了使用无噪声状态反馈或输出反馈稳定单个粒子和多个粒子平衡点的条件。给出了具有状态反馈的有界致动器噪声和具有输出反馈的有界传感器噪声的单粒子的实际稳定界。
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引用次数: 1
Robust Passively Safe Spacecraft Swarming via Closed-form and Optimization-based Control Approaches 基于封闭和优化控制方法的鲁棒被动安全航天器群
Pub Date : 2022-06-08 DOI: 10.23919/ACC53348.2022.9867216
T. Guffanti, S. D’Amico
Miniaturized space-borne multi-agent systems, a.k.a spacecraft swarms, promise to overcome the limitations of monolithic satellites, across the board, from capabilities to mission costs. Nevertheless, the use of low-size-weight-and-power as well as commercial-off-the-shelf hardware make them more prone to contingencies which may cause loss of control capabilities. Therefore, spacecraft swarms shall be collision-free in the presence of contingencies that prevent trajectory re-planning and control on the short term. Passive safety consists in guaranteeing safe separation robust to control losses, while in presence of system uncertainties. This paper explores both closed-form and direct optimization-based approaches to swarm passive safety, highlighting advantages, limitations and comparing them on a representative test case drawn from the upcoming VIrtual Super Optics Reconfigurable Swarm (VISORS) mission. The underlying shared mathematical foundation is the modeling of the swarm dynamics through a state parameterization in integration constants. Such state choice provides unique geometrical intuition at closed-form level, and makes passive safety tractable at direct optimization level. In particular, it permits to exploit variation of parameters to reduce the number of constraints required to enforce passive safety, and to compensate for nonintegrable dynamics and uncertainty effects. Besides the key trades, this paper shows how the presented approaches can enable tight and reconfigurable satellite swarming in the presence of contingencies.
小型化的星载多智能体系统,即航天器群,有望从能力到任务成本等各个方面克服单片卫星的局限性。然而,使用低尺寸、低重量和低功耗以及商用现成硬件使它们更容易发生可能导致控制能力丧失的突发事件。因此,在存在防止轨道重新规划和短期控制的突发事件的情况下,航天器群应该是无碰撞的。被动安全是指在系统存在不确定性的情况下,保证系统的安全分离,对损失的控制具有鲁棒性。本文探讨了基于封闭形式和直接优化的群体被动安全方法,突出了优点和局限性,并在即将到来的虚拟超光学可重构群体(VISORS)任务的代表性测试案例中对它们进行了比较。底层共享的数学基础是通过积分常数的状态参数化来建模群体动力学。这种状态选择在封闭层次上提供了独特的几何直观,在直接优化层次上使被动安全易于处理。特别是,它允许利用参数的变化来减少强制被动安全所需的约束数量,并补偿不可积动力学和不确定性效应。除了关键交易之外,本文还展示了所提出的方法如何在突发事件存在的情况下实现紧密和可重构的卫星群。
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引用次数: 2
Deep Reinforcement Learning Based Automatic Control in Semi-Closed Greenhouse Systems 基于深度强化学习的半封闭温室系统自动控制
Pub Date : 2022-06-08 DOI: 10.23919/ACC53348.2022.9867162
Akshay Ajagekar, F. You
This work proposes a novel deep reinforcement learning (DRL) based control framework for greenhouse climate control. This framework utilizes a neural network to approximate state-action value estimation. The neural network is trained by adopting a Q-learning based approach for experience collection and parameter updates. Continuous action spaces are effectively handled by the proposed approach by extracting optimal actions for a given greenhouse state from the neural network approximator through stochastic gradient ascent. Analytical gradients of the state-action value estimate are not required but can be computed effectively through backpropagation. We evaluate the performance of our DRL algorithm on a semi-closed greenhouse simulation located in New York City. The obtained computational results indicate that the proposed Q-learning based DRL framework yields higher cumulative returns. They also demonstrate that the proposed control technique consumes 61% lesser energy than deep deterministic policy gradient (DDPG) method.
本文提出了一种基于深度强化学习(DRL)的温室气候控制框架。该框架利用神经网络来近似状态-动作值估计。神经网络的训练采用基于q学习的方法进行经验收集和参数更新。该方法通过随机梯度上升从神经网络逼近器中提取给定温室状态下的最优动作,有效地处理了连续动作空间。不需要状态-作用值估计的解析梯度,但可以通过反向传播有效地计算。我们在位于纽约市的半封闭温室模拟中评估了我们的DRL算法的性能。计算结果表明,本文提出的基于q学习的DRL框架具有较高的累积收益。他们还证明了所提出的控制技术比深度确定性策略梯度(DDPG)方法消耗的能量少61%。
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引用次数: 2
Reduced Complexity Verification of Almost-Infinite-Step Opacity in Stochastic Discrete-Event Systems* 随机离散事件系统中近无限步不透明性的简化复杂度验证*
Pub Date : 2022-06-08 DOI: 10.23919/ACC53348.2022.9867224
Rongjian Liu, Jianquan Lu, C. Hadjicostis
The analysis of infinite-step opacity in the context of stochastic discrete-event systems has been investigated as almost-infinite-step opacity for quantitative purposes. In this paper, we revisit the verification problem for almost-infinite-step opacity by concentrating on reducing its computational complexity. One of the key steps in the verification of almost-infinite-step opacity is the recognition of the unsafe language for infinite-step opacity. Inspired by recently developed techniques in the literature, we present an improved methodology for the calculation of the unsafe language for infinite-step opacity, which further improves the complexity of the verification of almost-infinite-step opacity.
为了定量的目的,我们研究了随机离散事件系统中无限步不透明性的分析。在本文中,我们重新审视了几乎无限步不透明度的验证问题,重点是降低其计算复杂度。验证几乎无限步不透明性的关键步骤之一是识别无限步不透明性的不安全语言。受文献中最近发展的技术的启发,我们提出了一种改进的无限步不透明性不安全语言的计算方法,这进一步提高了几乎无限步不透明性验证的复杂性。
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引用次数: 0
Robust set-point regulation of gene expression using resource competition couplings in mammalian cells 利用哺乳动物细胞资源竞争偶联的基因表达稳健设定点调控
Pub Date : 2022-06-08 DOI: 10.23919/ACC53348.2022.9867225
G. Perrino, G. Stan
Gene expression depends on the cellular con-text. One major contributor to gene expression variability is competition for limited transcriptional and translational re-sources, which may induce indirect couplings among otherwise independently-regulated genes. Here, we apply control theoretical concepts and tools to design an incoherent feedforward loop (iFFL) biomolecular controller operating in mammalian cells using translational-resource competition couplings. Harnessing a resource-aware mathematical model, we demonstrate analytically and computationally that our resource-aware design can achieve near-constant set-point regulation of gene expression whilst ensuring robustness to plasmid uptake variation. We also provide an analytical condition on the model parameters to guide the design of the resource-aware iFFL controller ensuring robustness and performance in set-point regulation. Our theoretical design based on translational-resource competition couplings represents a promising approach to build more sophisticated resource-aware control circuits operating at the host-cell level.
基因表达取决于细胞环境。基因表达变异的一个主要因素是对有限的转录和翻译资源的竞争,这可能导致其他独立调控的基因之间的间接偶联。在这里,我们应用控制理论概念和工具,设计了一个非相干前馈回路(iFFL)生物分子控制器,利用翻译资源竞争耦合在哺乳动物细胞中运行。利用资源感知数学模型,我们通过分析和计算证明,我们的资源感知设计可以实现基因表达的近恒定设定点调节,同时确保对质粒摄取变化的稳健性。我们还提供了模型参数的解析条件,以指导资源感知iFFL控制器的设计,确保在设定点调节时的鲁棒性和性能。我们基于平移-资源竞争耦合的理论设计代表了一种有前途的方法,可以构建在宿主细胞水平上运行的更复杂的资源感知控制电路。
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引用次数: 1
Synthesizing Supervisors with a Minimum Control Base for Discrete-Event Systems 离散事件系统最小控制基的综合监督
Pub Date : 2022-06-08 DOI: 10.23919/ACC53348.2022.9867883
Richard Hugh Moulton, S. Scott, K. Rudie
Controlling a discrete-event system commonly entails synthesizing a supervisor to ensure that the plant’s closed-loop behaviour respects a certain specification. In the traditional approach to this problem, if the desired behaviour is not controllable then the specification’s supremal controllable sublanguage is enforced instead. Here we invert the problem and formulate the Minimum Control Base Problem, with the goal of finding the minimum set of controllable events that guarantees controllability for the desired behaviour. We show that the sets of controllable events that maintain controllability for the desired behaviour form a complete lattice with respect to subset inclusion and that there is therefore a minimum capability supervisor for any desired sublanguage of the plant’s behaviour. We apply our techniques to the Small Factory problem and discuss further applications including systems design, dynamic discrete-event systems, and biological systems.
控制一个离散事件系统通常需要综合一个监督器,以确保工厂的闭环行为符合一定的规范。在解决这个问题的传统方法中,如果期望的行为是不可控制的,那么规范的最高可控制子语言将被强制执行。在这里,我们将问题反过来并制定最小控制基础问题,其目标是找到保证期望行为的可控性的最小可控事件集。我们证明了对期望行为保持可控性的可控事件集形成了一个关于子集包含的完备格,因此对于任何期望的植物行为子语言都存在最小能力监督器。我们将我们的技术应用于小工厂问题,并讨论进一步的应用,包括系统设计,动态离散事件系统和生物系统。
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引用次数: 0
Towards Contact Point and Surface Normal Estimation for Control of Flexible Tool 柔性刀具控制中的接触点和曲面法向估计研究
Pub Date : 2022-06-08 DOI: 10.23919/ACC53348.2022.9867803
Christoffer Sloth, Aljaz Kramberger, Emil Lykke Diget, Iñigo Iturrate
In this paper, we present contact point and surface normal estimators for robotic applications with flexible tools. The estimators rely on state information of a flexible tool model; this information is obtained from an unknown input observer. The observer uses force and torque measurements at the root of the flexible tool to estimate the deflection of the tool although the force applied to the tip of the tool is unknown. The flexible tool is modeled with a finite element approximation of an Euler-Bernoulli beam model including contact forces between the flexible tool tip and the environment.The unknown input observer provides estimates of the contact point between the flexible tool and the rigid environment in addition to the contact force. This information is subsequently used to estimate a surface normal of the environment. The estimators can be deployed together with an adaptive parallel position/force controller to ensure tracking of position and force references for the tip of a flexible tool.The proposed estimation algorithm is verified in simulation and validated in real robot experiments. The method enables accurate force and position tracking in addition to adaptation to the surface geometry.
在本文中,我们提出了接触点和表面法向估计与柔性工具的机器人应用。该估计器依赖于柔性工具模型的状态信息;这个信息是从一个未知的输入观测器获得的。观察者使用在柔性刀具根部的力和扭矩测量来估计刀具的挠度,尽管施加在刀具尖端的力是未知的。采用欧拉-伯努利梁模型的有限元逼近模型对柔性刀具进行建模,该模型考虑了柔性刀具尖端与环境之间的接触力。除了接触力之外,未知输入观测器还提供了柔性工具与刚性环境之间接触点的估计。该信息随后用于估计环境的表面法线。该估计器可与自适应平行位置/力控制器一起部署,以确保跟踪柔性刀具尖端的位置和力参考。所提出的估计算法在仿真和真实机器人实验中得到了验证。除了适应表面几何形状外,该方法还可以实现精确的力和位置跟踪。
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引用次数: 0
Cooperative Filtering and Parameter Estimation for Polynomial PDEs using a Mobile Sensor Network 基于移动传感器网络的多项式偏微分方程协同滤波与参数估计
Pub Date : 2022-06-08 DOI: 10.23919/ACC53348.2022.9867676
Ziqiao Zhang, Wencen Wu, Fumin Zhang
In this paper, a constrained cooperative Kalman filter is developed to estimate field values and gradients along trajectories of mobile robots collecting measurements. We assume the underlying field is generated by a polynomial partial differential equation with unknown time-varying parameters. A long short-term memory (LSTM) based Kalman filter, is applied for the parameter estimation leveraging the updated state estimates from the constrained cooperative Kalman filter. Convergence for the constrained cooperative Kalman filter has been justified. Simulation results in a 2-dimensional field are provided to validate the proposed method.
本文提出了一种约束协同卡尔曼滤波器,用于估计移动机器人采集测量数据时沿轨迹的场值和梯度。我们假设底层场是由一个具有未知时变参数的多项式偏微分方程产生的。利用约束协同卡尔曼滤波器的更新状态估计,采用基于长短期记忆的卡尔曼滤波器进行参数估计。证明了约束协同卡尔曼滤波器的收敛性。给出了二维场的仿真结果,验证了该方法的有效性。
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引用次数: 2
A new connection protocol for multi-consensus of discrete-time systems 一种新的离散时间系统多一致性连接协议
Pub Date : 2022-06-08 DOI: 10.23919/ACC53348.2022.9867558
Mattia Mattioni, S. Monaco, D. Normand-Cyrot
In this paper, a new connection protocol for consensus of multi-agent discrete-time systems under a general communication graph is proposed. In particular, the coupling is realized based on the outputs making each agent passive in the u-average sense so guaranteeing convergence to the agreement steady-state, with no need of mitigating the coupling gain, as typically done in concerned literature. The proposed connection rule is shown to apply for network dynamics under aperiodic sampling when the sampling sequence is known to all agents.
提出了一种通用通信图下的多智能体离散系统一致性连接协议。特别是,耦合是基于输出实现的,使得每个agent在u平均意义上是被动的,从而保证收敛到一致的稳态,而不需要减轻耦合增益,就像相关文献中通常做的那样。当采样序列为所有智能体所知时,所提出的连接规则适用于非周期采样下的网络动力学。
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引用次数: 3
期刊
2022 American Control Conference (ACC)
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