{"title":"Self triggered controller co-design using LASSO regression","authors":"L. Etienne, K. Langueh, L. Rajaoarisoa","doi":"10.1109/MED54222.2022.9837186","DOIUrl":"https://doi.org/10.1109/MED54222.2022.9837186","url":null,"abstract":"In this work, we consider the control of a linear time-invariant system with self-triggered sampling. This study leads us to the resolution of the co-design problem. We address it by jointly computing the controller and the future sampling scheduled as a sparse optimization problem. Accordingly, we show that a relaxation of the optimal self trigger co-design can be formulated as a LASSO (Least Absolute Shrinkage and Selection Operator) regression. Thus, we give some results on the possibility to obtain a controller ensuring practical or asymptotic stability while reducing sampling of the control action, by using the properties of the solutions of the LASSO regression.","PeriodicalId":354557,"journal":{"name":"2022 30th Mediterranean Conference on Control and Automation (MED)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130603751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Overlapping Internal Boundary Control of Lane-free Automated Vehicle Traffic with State and Input Inclusion *","authors":"M. Malekzadeh, I. Papamichail, M. Papageorgiou","doi":"10.1109/MED54222.2022.9837257","DOIUrl":"https://doi.org/10.1109/MED54222.2022.9837257","url":null,"abstract":"Lane-free vehicle driving has been recently proposed for connected automated vehicles. Lane-free traffic implies that incremental changes of the road width lead to corresponding incremental changes of the traffic flow capacity. Internal boundary control (IBC) was introduced to flexibly share the total road width and capacity among the two traffic directions of a highway in real-time, so as to maximize the cross-road infrastructure utilization. Centralized solutions, requiring information from the whole highway stretch under consideration, have already been proposed, which, however, may be problematic for long highways with respect to the required communications and physical system architecture in real-time operation. This paper introduces an overlapping decentralized control scheme for IBC of lane-free automated vehicle traffic, based on a contractible controller, which is designed in a decomposed way (per subsystem) for an extended system. Simulation investigations, involving a realistic highway stretch and demand scenario, demonstrate that the proposed decentralized regulator is similarly efficient as the centralized solutions.","PeriodicalId":354557,"journal":{"name":"2022 30th Mediterranean Conference on Control and Automation (MED)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115122119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Katerina Maria Oikonomou, Ioannis Kansizoglou, A. Gasteratos
{"title":"A Framework for Active Vision-Based Robot Planning using Spiking Neural Networks","authors":"Katerina Maria Oikonomou, Ioannis Kansizoglou, A. Gasteratos","doi":"10.1109/MED54222.2022.9837132","DOIUrl":"https://doi.org/10.1109/MED54222.2022.9837132","url":null,"abstract":"Robust and energy-efficient robot planning is of utmost importance for mobile robots since the dynamic changes of the environment entail robotic agents with high adaptation capacities, so as to excel in their tasks. In this work, we introduce a hybrid spiking and deep neural network architecture for actor-critic control of a 6-DOF robot arm. Our method firstly involves autonomous object detection via active vision exploration and thereafter, the entire hybrid architecture is described. In specific, the actor utilises an integrated-and-fire model for action generation, while the critic a deep neural one for action evaluation. Lastly, the benefits of this approach in terms of energy efficiency are extensively discussed.","PeriodicalId":354557,"journal":{"name":"2022 30th Mediterranean Conference on Control and Automation (MED)","volume":"375 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123407598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Finite and Fixed Time Semistability and Consensus for Nonlinear Discrete-Time Network Systems","authors":"Junsoo Lee, W. Haddad","doi":"10.1109/MED54222.2022.9837233","DOIUrl":"https://doi.org/10.1109/MED54222.2022.9837233","url":null,"abstract":"This paper focuses on finite time and fixed time consensus protocols for discrete-time networks. Specifically, we build on the theory of finite time semistability for discrete-time dynamical systems to develop Lyapunov theorems for fixed time semistability. These results are then used to develop a framework for designing finite and fixed time semistable consensus protocols for discrete dynamical networks that achieve multiagent coordination tasks in finite and fixed time.","PeriodicalId":354557,"journal":{"name":"2022 30th Mediterranean Conference on Control and Automation (MED)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122118224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"On the Design of Coordinated Impedance Control Laws for De-orbiting and De-Spinning of Cooperative Satellites*","authors":"Kostas Nanos, E. Papadopoulos","doi":"10.1109/MED54222.2022.9837266","DOIUrl":"https://doi.org/10.1109/MED54222.2022.9837266","url":null,"abstract":"In several on-orbit applications, such as deorbiting, continuous contact between a servicing robot (chaser) and a serviced satellite (target) is needed. The task includes chaser free-space motion and subsequent contact interaction with a floating target. To achieve this, usually grasping of the satellite is proposed. However, most of the existing satellites on orbit have no dedicated grapple fixtures. In this paper, a coordinated impedance control law is proposed for the de-orbiting of a target via continuous contact and without grasping between the chaser end-effector and the target. Since both the manipulator’s end-effector and the spacecraft base are controlled, the developed controller guarantees singularity avoidance in addition to maintaining continuous contact between the two bodies. Also, this controller is adapted to be employed in the de-spinning of a rotating satellite with known angular velocity via continuous contact. The developed control laws apply to spatial systems and are illustrated by planar examples.","PeriodicalId":354557,"journal":{"name":"2022 30th Mediterranean Conference on Control and Automation (MED)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117116465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Combined observer design for road vehicles using LPV-based and learning-based methods","authors":"Dániel Fényes, T. Hegedüs, B. Németh","doi":"10.1109/MED54222.2022.9837151","DOIUrl":"https://doi.org/10.1109/MED54222.2022.9837151","url":null,"abstract":"In this paper a novel observer design method is proposed, which combines Linear Parameter-Varying-based (LPV) and machine-learning-based design tools. As a first step, a parameter optimization technique is developed to achieve a polytopic LPV formulation of the system model. This modeling technique also involves a machine-learning-based solution to determine scheduling parameters for the LPV system. In the second step, a LPV-based observer design based on the achieved system representation is proposed. Finally, the operation and the effectiveness of the proposed observer algorithm are demonstrated through a vehicle-oriented estimation problem, i.e., estimation of the lateral velocity. In the paper two simulations illustrate the accuracy and the advantageous impact of the observer on the control performances of the closed-loop system.","PeriodicalId":354557,"journal":{"name":"2022 30th Mediterranean Conference on Control and Automation (MED)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127324494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Trajectory Tracking and Fault Detection of Underactuated USVs based on Nonlinear Model Predictive Control and Moving Horizon Estimation","authors":"George Rossides, Christos C. Constantinou","doi":"10.1109/MED54222.2022.9837255","DOIUrl":"https://doi.org/10.1109/MED54222.2022.9837255","url":null,"abstract":"This paper brings together the concepts of Nonlinear Model Predictive Control (NMPC) and Moving Horizon Estimation (MHE) for the adaptive control of an underactuated Unmanned Surface Vehicle (USV) equipped with two azimuth thrusters for trajectory tracking applications. The proposed methodology achieves fault detection based on the estimation of thrusters efficiencies allowing the completion of the mission in the case of single thruster failure. Simulation studies that are based on a real USV \"Kerkouros\" are presented to verify the effectiveness of the proposed methodology.","PeriodicalId":354557,"journal":{"name":"2022 30th Mediterranean Conference on Control and Automation (MED)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127408738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Konstantinos A. Tsintotas, V. Sevetlidis, I. Papapetros, Vasiliki Balaska, A. Psomoulis, A. Gasteratos
{"title":"BK tree indexing for active vision-based loop-closure detection in autonomous navigation","authors":"Konstantinos A. Tsintotas, V. Sevetlidis, I. Papapetros, Vasiliki Balaska, A. Psomoulis, A. Gasteratos","doi":"10.1109/MED54222.2022.9837138","DOIUrl":"https://doi.org/10.1109/MED54222.2022.9837138","url":null,"abstract":"Aiming to recognize familiar places through the camera measurements during a robot’s autonomous mission, visual loop-closure pipelines are developed for navigation frameworks. This is because the main objective for any simultaneous localization and mapping (SLAM) system is its consistent map generation. However, methods based on active vision tend to attract the researchers’ attention mainly due to their offered possibilities. This paper proposes a BK-tree structure for a visual loop-closure pipeline’s generated database when active vision is adopted. This way, we address the drawback of scalability in terms of timing occurring when querying the map for similar locations while high performances and the online nature of the system are maintained. The proposed method is built upon our previous work for visual place recognition, that is, the incremental bag-of-tracked-words. The proposed technique is evaluated on two publicly-available image-sequences. The one is recorded via an unmanned aerial vehicle (UAV) and selected due to its active vision characteristics, while the second is registered via a car; still, it is chosen as it is among the most extended datasets in visual loop-closure detection. Our experiments on an entry-level system show high recall scores for each evaluated environment and response time that satisfies real-time constraints.","PeriodicalId":354557,"journal":{"name":"2022 30th Mediterranean Conference on Control and Automation (MED)","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127464483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ioannis Daramouskas, N. Patrinopoulou, Dimitrios Meimetis, V. Lappas, V. Kostopoulos
{"title":"A design and simulation of a target detection, tracking and localisation system for UAVs","authors":"Ioannis Daramouskas, N. Patrinopoulou, Dimitrios Meimetis, V. Lappas, V. Kostopoulos","doi":"10.1109/MED54222.2022.9837230","DOIUrl":"https://doi.org/10.1109/MED54222.2022.9837230","url":null,"abstract":"In computer vision multiple-object detection has gain significant interest by the researchers the last decade through the evolution in the field of deep learning. Nowadays, there are many architectures achieving great accuracy in detecting multiple objects in an image. On the other hand, tracking the detecting objects remains a very difficult task and still a lot of effort is provided in that field. In general, multiple-object detection, recognition and tracking are quite desired in many domains and applications. This paper presents a target detection, tracking and localisation solution for UAVs using optical cameras. A custom object detection model, based on YOLOv4-tiny, was developed based on YOLOv4-tiny and its performance was compared against YOLOv4-tiny and YOLOv4-608. While the target track algorithm in use is base on Deep SORT, providing state of the art tracking. The presented localisation method is capable of determining the position of ground targets, detected from the custom object detection model, with great accuracy. Finally, a guidance methodology is presented, responsible for creating real-time movement commands for the UAV to follow a selected target and provide coverage over him. The overall system was tested using Software-In-The-Loop (SITL) simulation in Gazebo with up to four UAVs.","PeriodicalId":354557,"journal":{"name":"2022 30th Mediterranean Conference on Control and Automation (MED)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122363136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Basile, G. Tommasi, Carlo Motta, A. Petrillo, S. Santini
{"title":"Assessment of Initial-State-Opacity in Live Bounded and Reversible Discrete Event Systems via Integer Linear Programming","authors":"F. Basile, G. Tommasi, Carlo Motta, A. Petrillo, S. Santini","doi":"10.1109/MED54222.2022.9837143","DOIUrl":"https://doi.org/10.1109/MED54222.2022.9837143","url":null,"abstract":"Opacity is a property of discrete event systems (DES) that is related to the possibility of hiding a secret from external observers (the intruders). When the secret is the initial state of the system, the related opacity problem is referred to as Initial State Opacity (ISO). A sufficient condition to check ISO by solving Integer Linear Programming problems is given in this paper. Such a condition exploits the algebraic representation of Petri nets and a structural one of its behavior in terms of minimal support T-invariants. The effectiveness of the proposed approach is shown by means of examples.","PeriodicalId":354557,"journal":{"name":"2022 30th Mediterranean Conference on Control and Automation (MED)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130757593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}