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Sampled-data Control for a Class of Linear Hyperbolic Systems via the Lyapunov-Razumikhin Technique* 一类线性双曲型系统的Lyapunov-Razumikhin技术的采样数据控制
Pub Date : 2021-06-29 DOI: 10.23919/ecc54610.2021.9655186
Xinyong Wang, C. Fiter, Ying Tang, L. Hetel
This work investigates the stability for a class of linear hyperbolic systems with distributed sampled-data controllers. First, we convert the original system into an equivalent system in which the sampling induced error is modeled as a reset integrator. Then by means of an appropriate Lyapunov function coupled with the Razumikhin technique, sufficient conditions are given for the Rε - stability of the system. Finally, our results are validated by a numerical example.
本文研究了一类具有分布采样数据控制器的线性双曲型系统的稳定性。首先,我们将原始系统转换为等效系统,其中采样引起的误差被建模为重置积分器。然后利用适当的Lyapunov函数与Razumikhin技术相结合,给出了系统Rε -稳定的充分条件。最后,通过数值算例验证了本文的计算结果。
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引用次数: 0
Predictive Functional Control with Explicit Pre-conditioning for Oscillatory Dynamic Systems 振荡动态系统的显式预调节预测函数控制
Pub Date : 2021-06-29 DOI: 10.23919/ecc54610.2021.9655126
Muhammad Saleheen Aftab, J. Rossiter
Predictive functional control (PFC) is a popular industrial process control strategy, but its rather simplistic design renders it less effective in more demanding situations; for example, under-damping, open-loop instability or significant non-minimum phase characteristics have been difficult to control. Devising efficient strategies for such systems remains a topic of interest within the PFC community. This paper shows how a systematic pre-conditioning approach can improve PFC performance for under-damped systems. The proposed pre-conditioning stage is essentially an additional feedback loop whose sole purpose is to provide reliable predictions for PFC decision making. To prevent complicated performance tuning and constraints management procedures, compensator design is kept fairly simple and intuitive. Numerical studies verify the efficacy of the proposal.
预测功能控制(PFC)是一种流行的工业过程控制策略,但其相当简单的设计使其在更苛刻的情况下效果不佳;例如,欠阻尼、开环不稳定或显著的非最小相位特性一直是难以控制的。为这样的系统设计有效的策略仍然是PFC社区感兴趣的话题。本文展示了系统预调节方法如何改善欠阻尼系统的PFC性能。提出的预处理阶段本质上是一个额外的反馈回路,其唯一目的是为PFC决策提供可靠的预测。为了避免复杂的性能调优和约束管理过程,补偿器的设计保持相当简单和直观。数值研究验证了该方法的有效性。
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引用次数: 1
Real-time Multi-Object Tracking using Adaptive Filtering and Filter Banks for Maritime Applications 基于自适应滤波和滤波组的实时多目标跟踪海事应用
Pub Date : 2021-06-29 DOI: 10.23919/ecc54610.2021.9655132
Jiaying Lin, Aravindaraja Puthiyavinayagam, Shuchen Liu, M. Kurowski, Jan-Jöran Gehrt, R. Zweigel, D. Abel
This paper presents a novel approach to Multi-Object-Tracking (MOT), which solves the well-known problem of maritime surveillance. We use exteroceptive sensors, such as LiDAR, and Automatic Identification System (AIS), to measure the surroundings’ Vessels. These objects are associated using evidence theory. Afterward, the proposed algorithm tracks all the objects using a new concept: each object is tracked with a respective filter bank consisting of three Adaptive Extended Kalman Filters (AEKF) as subfilters. These have the same prediction model but different correction algorithms based on various measurement sources. The covariance noise matrices are adapted based on the current measurement quality. The filter banks can overcome drawbacks such as wrong and incomplete measurements, thus improving tracking performance.We have validated the algorithm in real-world scenarios in Rostock Harbor, Germany. The proposed algorithm can track all the objects within the view simultaneously in real-time. By comparing with a reference vessel, the mean 2D position error is ca. 2 m, which is much smaller than the AIS-only solution (5 to 10 m). During the test drive, the filter bank can detect and compensate for incorrect information, such as biased AIS positioning or incomplete LiDAR measurements, to guarantee robust positioning.
本文提出了一种新的多目标跟踪(MOT)方法,解决了海上监视中常见的问题。我们使用外部感知传感器,如激光雷达和自动识别系统(AIS),来测量周围的船只。这些物体是用证据理论联系起来的。然后,提出的算法使用一个新概念跟踪所有目标:每个目标由三个自适应扩展卡尔曼滤波器(AEKF)作为子滤波器组成的各自的滤波器组进行跟踪。它们具有相同的预测模型,但基于不同测量源的校正算法不同。根据当前测量质量调整协方差噪声矩阵。滤波器组可以克服诸如错误和不完整测量等缺点,从而提高跟踪性能。我们已经在德国罗斯托克港的真实场景中验证了该算法。该算法可以同时实时跟踪视图内的所有目标。与参考船只相比,平均2D位置误差约为2 m,远小于仅使用AIS的解决方案(5至10 m)。在测试驱动过程中,滤波器组可以检测和补偿不正确的信息,例如AIS定位偏差或LiDAR测量不完整,以保证鲁棒定位。
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引用次数: 0
Advanced Hierarchical Predictive Routing Control of a smart de-manufacturing plant 智能去制造工厂的高级分层预测路径控制
Pub Date : 2021-06-29 DOI: 10.23919/ecc54610.2021.9655105
R. Boffadossi, L. Fagiano, A. Cataldo, Marko Tanaskovic, M. Lauricella
The application of a novel approach to the routing control problem of a real de-manufacturing plant is presented. Named Hierarchical Predictive Routing Control (HPRC) and recently proposed in the literature, the approach deals with large number of integer inputs and complex temporal-logic constraints by adopting a low-level path-following strategy and a high-level predictive path allocation. Several improvements are presented, including a novel search tree exploration method, lockout detection routines, and plant-specific handling constraints. Simulation results show very good performance and small computational times even with high number of pallets and long prediction horizon values.
提出了一种新方法在实际解制造工厂的路径控制问题中的应用。该方法被命名为分层预测路由控制(HPRC),最近在文献中提出,该方法通过采用低级路径跟踪策略和高级预测路径分配来处理大量整数输入和复杂的时间逻辑约束。提出了一些改进,包括一种新的搜索树探索方法,锁定检测例程和特定于植物的处理约束。仿真结果表明,即使在托盘数量多、预测视界值长的情况下,该算法也具有良好的性能和较短的计算时间。
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引用次数: 1
A Modified Recursive Newton-Euler Algorithm Embedding a Collision Avoidance Module 嵌入避碰模块的改进递归牛顿-欧拉算法
Pub Date : 2021-06-29 DOI: 10.23919/ecc54610.2021.9655037
Francesco Trotti, Eros Ghignoni, Riccardo Muradore
Planning collision-free trajectories for robotic manipulators is a quite old problem that has recently re-gained importance thanks to collaborative robotics. In scenarios where a robot is moving close to an operator, it is of paramount importance to detect obstacles (e.g. human’ arms) that must be avoided. When the environment is dynamic this problem is still challenging. In this paper we integrate a recent collision avoidance algorithm based on the efficient computation of distances between capsules and the environment into the well-known recursive Newton-Euler algorithm for computing the inverse dynamics of serial-link manipulators. This approach allows to compute repulsive torques at the joint level that guarantee collision-free motion at run-time. The proposed approach has been validated on a simulated environment using a six degrees of freedom UR5 robot.
机器人操纵器的无碰撞轨迹规划是一个相当古老的问题,最近由于协作机器人而重新获得重视。在机器人靠近操作员移动的场景中,检测必须避开的障碍物(例如人的手臂)至关重要。当环境是动态的时,这个问题仍然具有挑战性。本文将一种基于有效计算胶囊与环境之间距离的避碰算法整合到著名的递推牛顿-欧拉算法中,用于计算串行连杆机械臂的逆动力学。这种方法允许在关节水平上计算排斥力矩,以保证在运行时无碰撞运动。该方法已在一个六自由度UR5机器人的仿真环境中得到验证。
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引用次数: 0
Robust Iterative Learning Control for Spatially Interconnected Systems using 2D Control Theory* 基于二维控制理论的空间互联系统鲁棒迭代学习控制*
Pub Date : 2021-06-29 DOI: 10.23919/ecc54610.2021.9654959
B. Sulikowski, K. Gałkowski, Daniel Trzciński, E. Rogers, A. Kummert
This paper develops a class of iterative learning control (ILC) laws for a subclass of uncertain spatially interconnected systems. Model uncertainties appear both in the state and the output equation of the dynamics modeled in the 2D systems setting to which existing results are not applicable. The first stage is to write the dynamics in 2D model form. Then the stability theory for a distinct class of 2D systems known as repetitive processes is used to develop the ILC law in the case of differential dynamics. This analysis results in a design algorithm that can be applied using linear matrix inequalities.
本文针对不确定空间互联系统的一个子类,提出了一类迭代学习控制(ILC)定律。模型的不确定性既出现在二维系统模型的状态方程中,也出现在现有结果不适用的输出方程中。第一阶段是用二维模型形式写出动力学。然后,在微分动力学的情况下,利用二维系统的稳定性理论(称为重复过程)来发展ILC定律。这种分析的结果是一种可以应用于线性矩阵不等式的设计算法。
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引用次数: 0
Distinguishability Analysis for Multiple Mass Models of Servo Systems with Commissioning Sensors 带调试传感器伺服系统多质量模型的可分辨性分析
Pub Date : 2021-06-29 DOI: 10.23919/ecc54610.2021.9654884
M. Tantau, Lars Perner, M. Wielitzka
Physically motivated models of electromechanical motion systems enable model-based control theory and facilitate system interpretation. Unfortunately, the effort of modelling restricts the usage of model-based methods in many applications. Some approaches to automatically generate models from measurements choose the best model based on minimizing the residual. These model selection attempts are limited due to ambiguities in reconstructing the internal structure from the input-output behaviour because usually motion systems have only one actuator and one sensor. Often, it is unknown if the resulting model is unique or if other models with different structure would fit equally well. The set of candidate models should be designed to contain only distinguishable models but ambiguities are often unknown to the experimenter. In this paper distinguishability is investigated systematically for a class of multiple mass models representing servo positioning systems. In the analysis a new criterion for indistinguishability is used. The benefit of additional, structural sensors on distinguishability of models is demonstrated which suggests to mount them temporarily for the commissioning phase in order to facilitate the model selection. It turns out that the best results can be achieved if synergies among sensor signals are utilized.
机电运动系统的物理激励模型使基于模型的控制理论和方便的系统解释。不幸的是,建模工作限制了基于模型的方法在许多应用中的使用。一些从测量数据中自动生成模型的方法基于残差最小化来选择最佳模型。由于运动系统通常只有一个执行器和一个传感器,因此从输入-输出行为重建内部结构时存在歧义,因此这些模型选择尝试受到限制。通常,我们不知道得到的模型是否是唯一的,或者其他具有不同结构的模型是否也能很好地拟合。候选模型集应该设计成只包含可区分的模型,但实验者通常不知道模糊性。本文系统地研究了代表伺服定位系统的一类多质量模型的可分辨性。在分析中使用了一种新的不可分辨性准则。额外的结构传感器对模型的可识别性的好处被证明,这建议在调试阶段临时安装它们,以便于模型选择。结果表明,利用传感器信号之间的协同效应可以达到最佳效果。
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引用次数: 0
High speed driving with the Affine in the Force Input model 力输入模型中具有仿射的高速驾驶
Pub Date : 2021-06-29 DOI: 10.23919/ecc54610.2021.9655045
Marco Baur, L. Bascetta
The AFI model is an effective representation of vehicle lateral dynamics, particularly suitable to design linear model-based trajectory tracking controllers. As already observed in the literature, however, controllers designed on the AFI model are affected at high speed by poorly damped yaw rate oscillations, that severely hamper passenger riding comfort and safety. This paper proposes a system-theoretical analysis that explains the cause of these oscillations, and opens the way to the design of an advanced gain-scheduling controller that keeps a constant desired damping ratio independently of vehicle velocity. This controller can be used as an ADAS to increase the safety and comfort of a human driven vehicle, or as the inner loop of a cascaded control architecture in an autonomous vehicle. Simulations demonstrate the effectiveness and robustness of the proposal in damping yaw rate oscillations during a critical manoeuvre, like double-lane-change, performed at different velocities.
AFI模型是车辆横向动力学的有效表征,特别适用于设计基于线性模型的轨迹跟踪控制器。然而,正如在文献中已经观察到的那样,在AFI模型上设计的控制器在高速时受到偏航率振荡的不良阻尼的影响,这严重影响了乘客的乘坐舒适性和安全性。本文提出了一种系统理论分析,解释了这些振荡的原因,并为设计一种先进的增益调度控制器开辟了道路,该控制器可以保持恒定的期望阻尼比,而不受车辆速度的影响。该控制器可以用作ADAS,以提高人类驾驶车辆的安全性和舒适性,也可以用作自动驾驶车辆级联控制体系结构的内环路。仿真结果表明,该方法在不同速度下双变道等关键机动过程中对横摆角速度振荡的抑制是有效的和鲁棒的。
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引用次数: 0
Robust Zonotopic Set-Membership Approach for Model-Based Prognosis: Application on Linear Parameter-Varying Systems 基于模型预测的鲁棒分区集隶属度方法:在线性变参数系统中的应用
Pub Date : 2021-06-29 DOI: 10.23919/ecc54610.2021.9655047
Ahmad Al-Mohamad, V. Puig, G. Hoblos
A robust set-membership Prognostics and Health Management (PHM) methodology is presented in this paper. The key advantages of the set-membership approach for states and parameters estimation are enhanced by employing zonotopes that are less conservative and computationally complex than other sets. The optimal tuning of the proposed observer is formulated using the Linear Matrix Inequality (LMI) approach. Moreover, the Joint Estimation of States and Parameters (JESP) leads to a non-linear representation of a monitored system that is transformed into a Linear Parameter-Varying (LPV) system by means of the non-linear embedding approach. The considered case study is based on a slowly degraded DC-DC converter. The aim of the proposed PHM approach is to forecast the Remaining Useful Life (RUL) on a system level. Additionally, the proposed RUL forecasting approach is independent of previous knowledge of the degradation behaviors being only dependent on the estimated zonotopic parameters. Finally, the obtained results demonstrate the efficiency of the proposed approach.
提出了一种鲁棒的集隶属度预测和健康管理方法。通过使用比其他集合保守性和计算复杂性更小的分区,增强了集隶属度方法在状态和参数估计方面的主要优点。利用线性矩阵不等式(LMI)方法对所提出的观测器进行最优调谐。此外,状态和参数的联合估计(JESP)通过非线性嵌入方法将被监测系统的非线性表示转化为线性变参(LPV)系统。考虑的案例研究是基于一个缓慢退化的DC-DC转换器。提出的PHM方法的目的是在系统级别上预测剩余使用寿命(RUL)。此外,所提出的RUL预测方法独立于先前的退化行为知识,仅依赖于估计的分区参数。最后,仿真结果验证了该方法的有效性。
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引用次数: 1
Distributed Model Predictive Control based on Dual Decomposition with Neural-Network-based Warm Start 基于神经网络热启动对偶分解的分布式模型预测控制
Pub Date : 2021-06-29 DOI: 10.23919/ecc54610.2021.9655150
P. Chanfreut, A. Sánchez-Amores, J. Maestre, E. Camacho
This work deals with the application of neural networks to speed up the convergence of a distributed model predictive control (DMPC) algorithm based on dual decomposition. While dual decomposition methods are known to converge to the centralized MPC solution, numerous iterations may be required before convergence is attained, thus increasing computation and communication burden. In this paper, a database containing system states and optimal Lagrange multipliers is created offline to train a neural network, which is incorporated into the online operation of the distributed system. Numerical results on an input-coupled 16 tanks benchmark are provided.
本文研究了神经网络在基于对偶分解的分布式模型预测控制(DMPC)算法中的应用。虽然已知对偶分解方法收敛于集中式MPC解决方案,但在达到收敛之前可能需要多次迭代,从而增加了计算和通信负担。本文通过离线创建包含系统状态和最优拉格朗日乘子的数据库来训练神经网络,并将其纳入分布式系统的在线运行中。给出了输入耦合16罐基准的数值结果。
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引用次数: 1
期刊
2021 European Control Conference (ECC)
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