{"title":"Robust cooperative output regulation problem for nonlinear multi-agent systems","authors":"Lu Liu","doi":"10.1109/ICCA.2011.6137943","DOIUrl":"https://doi.org/10.1109/ICCA.2011.6137943","url":null,"abstract":"In this paper, we consider a robust cooperative output regulation problem in a class of uncertain nonlinear multi-agent systems. It is assumed that only some of the agents are able to access the exosystem, and thus the problem has to be solved by cooperation among different agents. An internal model based control strategy is proposed such that, regardless of small parameter perturbations of the agent and control law, the objective of asymptotic tracking and disturbance rejection can be achieved by the control law.","PeriodicalId":384243,"journal":{"name":"2011 9th IEEE International Conference on Control and Automation (ICCA)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116910232","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":"Adaptive control for power management","authors":"S. Luiz, A. Perkusich, A. Lima","doi":"10.1109/ICCA.2011.6138009","DOIUrl":"https://doi.org/10.1109/ICCA.2011.6138009","url":null,"abstract":"Power management techniques are applied to several types of computer systems, such as desktops, servers and embedded systems. For all of those systems, the use of a power management technique is expected to decrease power consumption without degrading performance. Therefore, a variety of power management techniques tailored for specific hardware architectures and the power management mechanisms for computer systems have been investigated. Feedback control constitutes a very promising technique for power management, because it provides some theoretical guarantees in terms of tracking accuracy and system stability. However, a computer system is subjected to unknown and nonstationary workloads. Therefore a feedback control based power management policy must be capable of adapting itself to the fluctuations of the workload, and still guarantee optimal performance with minimum power consumption. This paper proposes an adaptive control technique for power management considering such requirements. The experimental results have shown that the proposed adaptive control technique outperformed other state-of-the art policies both in power and system performance.","PeriodicalId":384243,"journal":{"name":"2011 9th IEEE International Conference on Control and Automation (ICCA)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115045193","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":"Control of Active Magnetic Bearing systems on non-static foundations","authors":"S. Yoon, Zongli Lin, T. Dimond, P. Allaire","doi":"10.1109/ICCA.2011.6137957","DOIUrl":"https://doi.org/10.1109/ICCA.2011.6137957","url":null,"abstract":"A case study of an electric motor with Active Magnetic Bearings (AMBs) that is subjected to the waving of the supporting foundation is presented. The motor is intended for sea applications where the ship is disturbed by the oscillation of the waves. Initially, a tilt-and-translate PID controller is designed to stabilize the rotor in the magnetic bearing system and satisfy the Zone A specifications defined by the International Organization for Standardization (ISO 14839) for new machines with magnetic bearings. The performance of the tilt-and-translate controller is then tested when the motor is subjected to the waving of the foundation. Simulation shows that the rotor vibration level easily exceeds the permitted level by the ISO specifications due to a combination of the waving disturbance from the foundation and the gyroscopic forces. Based on the results with the tilt-and-translate controller, a robust μ controller is designed to reduce the vibration of the rotor. The performance of the controller is tested when subjected to the waving of the foundation, and simulation shows that the vibration level is reduced to the level permitted by the ISO specifications.","PeriodicalId":384243,"journal":{"name":"2011 9th IEEE International Conference on Control and Automation (ICCA)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116023082","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":"A new approach on H∞ control of linear singular perturbation systems","authors":"A. Fakharian, T. Gustafsson, M. Y. A. Khanian","doi":"10.1109/ICCA.2011.6137889","DOIUrl":"https://doi.org/10.1109/ICCA.2011.6137889","url":null,"abstract":"In this paper a new approach for solving the H∞ control problem using static state-feedback for LTI singular perturbation systems is proposed. The proposed controller is given in terms of the solution of a set of matrix inequalities independent of the singular parameter ε. These inequalities are not in the form of linear matrix inequalities (LMI). By introducing a new algorithm, these inequalities are solved through LMI formulation. To show the effectiveness of the proposed algorithm comparing to other methods, an illustrative example is also provided.","PeriodicalId":384243,"journal":{"name":"2011 9th IEEE International Conference on Control and Automation (ICCA)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122399351","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":"Three-robot minimum-time optimal line formation","authors":"Meiling Wang, Zhenchao Jia, Hongbin Ma, M. Fu","doi":"10.1109/ICCA.2011.6138037","DOIUrl":"https://doi.org/10.1109/ICCA.2011.6138037","url":null,"abstract":"Multi-robot formation problem has received increasing attention due to its wide applications like surveillances. To illustrate a novel framework on optimal multi-robot formation given in our previous work, which aims to answer the long-term ignored fundamental problem of describing the formation and clarifying optimal formation rigorously in a mathematical manner, as a preliminary case study, two typical cases of the minimum-time line formation problem for three robots are investigated in this note. In this problem, different robots may move with different speeds and the three-robot team aims to row on a straight line with the minimum formation time. Mathematical results have been established with algebraic and geometric analysis, which are further verified by extensive experimental results.","PeriodicalId":384243,"journal":{"name":"2011 9th IEEE International Conference on Control and Automation (ICCA)","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114566650","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":"Analysis of sidelobe effects and resolution of PTFT","authors":"Lu Wang, G. Bi, Xiaolei Lv","doi":"10.1109/ICCA.2011.6137905","DOIUrl":"https://doi.org/10.1109/ICCA.2011.6137905","url":null,"abstract":"This paper focuses on the problems of parameter estimation based on the polynomial time-frequency transform (PTFT). The estimation performance is significantly degraded when multiple signal components are dealt with due to the sidelobe effects from each component. This paper theoretically analyzes the amplitude and sidelobe of the PTFT and applies the cleaning technique to minimize the sidelobe effect. The resolution of the PTFT is also analyzed for signals with multiple-components. Numerical results are presented to support the validity and correctness of theoretical derivation. Simulation results also show that the cleaning technique can significantly improve the estimation performance of the PTFT for signals with multiple time-varying components.","PeriodicalId":384243,"journal":{"name":"2011 9th IEEE International Conference on Control and Automation (ICCA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117022984","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}
Fernando Bernuy, Javier Ruiz-del-Solar, Isao Parra-Tsunekawa, P. Vallejos
{"title":"Adaptive and real-time unpaved road segmentation using color histograms and RANSAC","authors":"Fernando Bernuy, Javier Ruiz-del-Solar, Isao Parra-Tsunekawa, P. Vallejos","doi":"10.1109/ICCA.2011.6138056","DOIUrl":"https://doi.org/10.1109/ICCA.2011.6138056","url":null,"abstract":"The determination of the position of the road that a vehicle is following is a topic of high interest in research applications related to driverless cars and driving assistance tools. The complexity of this task increases in natural terrains with unpaved lanes and unstructured objects such as trees, stones, and other natural objects. In this paper, a novel, adaptive and real-time visual road segmentation method for off-road autonomous driving is proposed. The method is based on the use of adaptive color histograms, however, its main novelties are the use of the RANSAC algorithm in order to determine the road borders and the vanishing point, and a set of heuristic rules that allow checking the spatiotemporal consistency of the road determination. Both ideas allow obtaining, at the same time, high robustness and real-time operation. The method is validated using real-world video sequences obtained in off-road driving","PeriodicalId":384243,"journal":{"name":"2011 9th IEEE International Conference on Control and Automation (ICCA)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129510098","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}
R. Muñoz-Mansilla, J. Almansa, J. M. Díaz, D. Chaos, A. Reinoso
{"title":"Applications of QFT robust control techniques to marine systems","authors":"R. Muñoz-Mansilla, J. Almansa, J. M. Díaz, D. Chaos, A. Reinoso","doi":"10.1109/ICCA.2011.6138010","DOIUrl":"https://doi.org/10.1109/ICCA.2011.6138010","url":null,"abstract":"In this work an overview of the application of the Quantitative Feedback Theory (QFT) technique to different marine systems is presented. Namely the problems of the stabilization of a high-speed craft, the dynamic positioning of a moored platform and the tracking control of a hovercraft are studied. An interesting question is that the plants have less degree of freedom for actuation and is more difficult to control. The three multivariable nonlinear problems are tackled by different procedures. Performance evaluation analyses and simulations in different conditions are carried out. It is shown that robust techniques based on QFT methodology result feasible and very suitable; and therefore they constitute attractive alternatives in the application of stabilization, dynamic positioning and tracking control of advanced marine systems.","PeriodicalId":384243,"journal":{"name":"2011 9th IEEE International Conference on Control and Automation (ICCA)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124596192","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}
Gonzalo Andres Garcia, Shawn Shahriar Keshmiri, R. D. Colgren
{"title":"H-Infinity gain scheduling design for the meridian UAS for a broader range of operation and for fault tolerant applications","authors":"Gonzalo Andres Garcia, Shawn Shahriar Keshmiri, R. D. Colgren","doi":"10.1109/ICCA.2011.6137962","DOIUrl":"https://doi.org/10.1109/ICCA.2011.6137962","url":null,"abstract":"This paper describes the design of a MIMO H-infinity gain schedule for the Meridian UAS and illustrates its application for an extended operational range and for a moderate fault tolerant capability. The gain scheduling concept is based on smooth interpolation between two H-infinity controllers, covering a broad range of trim conditions. This interpolation is provided by the homogeneous design of the controllers by using the same augmented model structure within the H-infinity algorithm. The scheduling variable is defined as the commanded airspeed, acting as an exogenous variable, driving a smooth transition between the current and the next controller. The utilization of an exogenous signal avoids the occurrence of hidden coupling effects, typical in gain scheduling applications. Also, a new procedure is defined to adapt the controller when a failure or a significant dynamic change in the UAS takes place. Using the best knowledge of the failure the H-infinity controller is calculated. This controller is computed with a predefined gamma value, avoiding iterations, generating the new controller instantaneously.","PeriodicalId":384243,"journal":{"name":"2011 9th IEEE International Conference on Control and Automation (ICCA)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129930842","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":"Exploring the stability of feature selection for imbalanced intrusion detection data","authors":"Fang Li, Hong Mi, F. Yang","doi":"10.1109/ICCA.2011.6138076","DOIUrl":"https://doi.org/10.1109/ICCA.2011.6138076","url":null,"abstract":"The class imbalance problem is of great importance to network intrusion detection data. Previous studies on feature selection always evaluate the performance of feature selection process according to the model performance and the size of selected feature subset, which neglect the stability of feature selection. We investigate the problem of the stability of feature selection and study in detail the properties of two state-of-the-art feature selection method, i.e. support vector machine recursive feature elimination (SVM-RFE) and random forest variable importance measures (RF-VIM) on the imbalanced intrusion detection data. Experimental results on KDD Cup 99 network intrusion data show the influence of imbalance rate on the stability of the algorithms, and demonstrate that stability is an important evaluation indicator of algorithm in practical applications of intrusion detection.","PeriodicalId":384243,"journal":{"name":"2011 9th IEEE International Conference on Control and Automation (ICCA)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130636115","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}