64 research outputs found
Modelling Cooperative Control Problems in the Cyber Environment: Introduction to Quasi Consensus Networks
The paper introduces the novel idea of the application of quasi consensus networks to
modelling networked distributed systems. Quasi consensus networks operate alike
standard consensus seeking ones without requesting the information state of the
contributing systems to converge to a predetermined value. The quasi consensus-
modelling paradigm can be used in modelling cooperative control problems in the
cyber environment when the achievement of a common value of the information state
is not the ultimate goal of the systems operation
An Algorithm for the Calculation of the Dwell Time Constraint for Switched
This paper presents a numerical algorithm for determining the minimum dwell time constraint for switched linear H-infinity fault detection filters. When applying switched systems, ensuring the stability is a crucial target, which can be guaranteed, when we switch slowly enough between the subsystems, more precisely when the intervals between two consecutive switching instants, called dwell time, are large enough. The problem formulation is based on multiple Lyapunov functions and is expressed through a special form of linear matrix inequalities (LMIs), which include a nonlinear term of the dwell time. This represents a multivariable, time dependent optimization problem. As a result, the task cannot be treated as a simple feasibility problem involving a LMI solver as it is widely used in applications of the linear control. To solve these special LMIs, we propose a numerical algorithm, calle
Hibadetektálás korszerű analitikus módszerei járműipari alkalmazásokkal = Advanced analytic methods to fault detection with application to vehicle systems
1) A rendszer modelljĂ©nek invertálásán alapulĂł detektálĂłszűrĹ‘k tulajdonságainak kutatása során kapott eredmĂ©nyek, ideĂ©rtve elsĹ‘sorban az inverz geometriai tulajdonságait Ă©s az inverz dinamika előállĂtására vonatkozĂł mĂłdszereket, lehetĹ‘vĂ© tettĂ©k az optimális zavargyengĂtĂ©s mĂłdszerĂ©nek a zavarokkal terhelt hibahatások teljes szĂ©tcsatolása rĂ©vĂ©n törtĂ©nĹ‘ alkalmazását az irodalom által eddig nem ismert mĂłdokon. Ezzel kapcsolatos legfontosabb eredmĂ©nyĂĽnk az inverz dinamikájának on-line becslĂ©sĂ©re Ă©pĂĽlĹ‘ H-infinity optimális szűrĂ©s mĂłdszerĂ©nek kidolgozása volt, ami jelentĹ‘s nemzetközi visszhangot kiváltĂł, elismert, Ăşj tudományos eredmĂ©nyek megalkotásához vezetett. 2) A szakterĂĽlet kutatĂłit általánosan Ă©rintĹ‘ jelentĹ‘s tudományos eredmĂ©ny a Draper Lab. munkatársaival vĂ©gzett kutatási tevĂ©kenysĂ©g rĂ©vĂ©n szĂĽletett folyĂłirat közlemĂ©ny, amely a dinamikus rendszerekben Ă©s a kĂ©p illetve jelfeldolgozásban használatos detektálási mĂłdszerek eddig kĂĽlönállĂłnak vĂ©lt elmĂ©leti mĂłdszereit helyezi közös alapokra, az invariáns alterek geometriai elmĂ©letĂ©nek közös alapjaira. 3) JelentĹ‘s Ă©rdeklĹ‘dĂ©st kiváltĂł eredmĂ©nyĂĽnk az elosztott dinamikus rendszerekben az állapotbecslĂ©s hibatűrĂ©sĂ©nek Ă©s performancia mutatĂłinak javĂtására alkalmazhatĂł elosztott szűrĂ©si mĂłdszer kidolgozása, amely a szövetsĂ©gi (federated) szűrĹ‘bankok továbbfejlesztĂ©se rĂ©vĂ©n jött lĂ©tre. | 1) The novel theory of detection filters, based on the idea of direct input reconstruction, which relies on the inverse representation of the system, can be used to construct novel filter structures, such as those which combine the advantages of optimal disturbance suppression and exact fault decoupling. The research also helped to clarify the geometric principles of the inverse. The algebraic-geometric methods can be used for the construction of the inverse. The most important result is the development of the H-infinity filtering method which is capable for optimally enhanced disturbance cancellation and exact fault decoupling based on the estimation of the inverse state. 2) The joint research with co-workers at Draper Laboratory has revealed a number of methodological parallelisms and similarities, as well as differences, in the game theoretic, stochastic, and geometric subspace formulations and solution approaches to robust detection in dynamic systems and in signal processing. It is a synthesizing result deserving the attention of both the control and the signal processing community. 3) The decentralized approach to state estimation of distributed dynamical systems over unreliable communication networks subject to uncertain and limited measurements has been addressed by federated filtering. The solution enhances fault tolerance and filter performance in sparsely distributed dynamical systems
Bridging the gap between theory and practice in LPV fault detection for flight control actuators
Two different approaches for fault detection,the geometric and the detection filter based methods,are compared in the paper from practical aspects,using the linear parameter-varying (LPV) framework.
Presenting two designs allows a comparison of global, system level, and local component level fault detection methods with special emphasis on their relevance to aircraft industry.Practical engineering design decisions are highlighted via applying them to a high-fidelity commercial aircraft problem.
The successive steps of the design, including fault modelling, LPV model generation, and LPV FDI filter synthesis, including implementation aspects, are discussed. Results are presented according to the industrial assessment perspectives phrased within the EU ADDSAFE project
Dinamikus rendszerek kvalitatĂv Ă©s kvantitatĂv tulajdonságainak vizsgálata Ă©s alkalmazásai = Applications and analysis of time varying systems
A lineáris rendszerek algebrai vizsgálata kapcsán bevezetett Ăşn. vertikuum-tĂpusĂş rendszerek segĂtsĂ©gĂ©vel sikerĂĽlt igen bonyolult gráfĂş komplex gazdasági Ă©s műszaki rendszereket „egyszerűbb szerkezetűvé” transzformálni. A kĂĽlönfĂ©le vertikuum-tĂpusĂş rendszerek mind gyakorlati, mind elmĂ©leti jelentĹ‘sĂ©ge abban rejlik, hogy egy termĂ©szetes algoritmizálást kĂnál, másrĂ©szt az is kiderĂĽlt, hogy „szinte minden” rendszer vertikuum-tĂpusĂş rendszerrĂ© transzformálhatĂł. A kutatás során fontos eredmĂ©ny volt, hogy a rĂ©szvertikuumok irányĂthatĂłsága, megfigyelhetĹ‘sĂ©ge Ă©s a teljes rendszer irányĂthatĂłsága Ă©s megfigyelhetĹ‘sĂ©ge közötti kapcsolat, amely szerint ha a rĂ©szvertikuumok megfigyelhetĹ‘ek Ă©s/vagy irányĂthatĂłak, akkor a teljes rendszer is megfigyelhetĹ‘ Ă©s/vagy irányĂthatĂł. A vertikuum-tĂpusĂş rendszerek vizsgálatakor felmerĂĽlĹ‘ fontos problĂ©ma, ha az egyik Ai-t alrendszert ki-, vagy bekapcsoljuk. Egy ilyen rendszer irányĂthatĂłságára adtunk rangfeltĂ©telt a kapcsolásokra feltett gerjesztĂ©si feltĂ©telek mellett, Ă©s ezután általánosĂtottuk több alrendszerre is, valamint sikerĂĽlt a kapcsolt vertikuum tĂpusĂş rendszerek irányĂthatĂłságára Ă©s megfigyelhetĹ‘sĂ©gĂ©re szĂĽksĂ©ges Ă©s elĂ©gsĂ©ges feltĂ©telt adnunk. A kutatási tervben szereplĹ‘ alkalmazásokat illetĹ‘en egyfelĹ‘l teljes mĂ©rtĂ©kben teljesĂtettĂĽk a kitűzött kutatási feladatokat, másrĂ©szt azokat csatlakozĂł tematikával sikerĂĽlt messzemenĹ‘en kiterjeszteni, Ă©s Ăşj kontrollelmĂ©leti Ă©s játĂ©kelmĂ©leti modellezĂ©si vizsgálatokkal kiegĂ©szĂteni. | Verticuum type systems were introduced during the algebraic analysis of linear systems, and proved to be an excellent means of transforming complex graphed economic and engineering systems to a simpler structure. The theoretical and practical significance of verticuum type systems is that on the one hand almost all systems can be transformed to a verticuum-type representation, and that they offer a straightforward algorithmic approach. An important result of our resarch was that a connection was made between the subverticuums and the original verticuum type systems controllability and observability qualities. We showed that if the subverticuums are observable and/or controllable then the original system is also observable and/or controllable. Concerning another important problem, the switching (on or off) type of subsystems we gave a rank condition for the controllability of the system under given persisting conditions made for the switching subsystem, and we generalised the results for multiple subsystems. Considering the applications outlined in the research plan we managed to fully perform the planned tasks, moreover with the thematical extensions we managed to make a much wider outreach by undertaking additional game theoretical and control theoretical analyses
Az elmĂ©letileg elĂ©rhetĹ‘ legjobb irányĂtás algoritmusainak kutatása = Investigation of the theoretically reachable best control algorithms
MĂłdszert dolgoztunk ki lineáris, állandĂł paramĂ©terű folyamatok szabályozási köreiben a beavatkozĂł szervek Ă©s magának a folyamatnak a tulajdonságaibĂłl adĂłdĂł korlátozásoktĂłl fĂĽggĹ‘ határ-optimális szabályozĂłk tervezĂ©sĂ©re. Algoritmust fejlesztettĂĽnk ki a beavatkozĂł szerv amplitudĂł korlátozásátĂłl fĂĽggĹ‘ elĂ©rhetĹ‘ legjobb tervezĂ©si cĂ©l (referencia modell) meghatározására. Megadtuk a nominális Ă©s az elĹ‘zĹ‘ mĂłdszerrel kapott optimális referencia modellektĹ‘l fĂĽggĹ‘ optimális szabályozĂłk algoritmusait, amelyek a realizálhatĂłsági vesztesĂ©get minimalizálják. Az optimális szabályozĂłkat stabilis folyamatok Youla parametrizált szabályozási köreire határoztuk meg. Az optimalitás kritĂ©riumakĂ©nt a H2, Hinf Ă©s L2, Linf normákat alkalmaztuk. A realizálhatĂłsági vesztesĂ©g H2, L2 normák szerinti optimalitását a szabályozĂłk - speciális Diofantoszi egyenletek alapján számolt - belsĹ‘ szűrĹ‘inek felhasználásával biztosĂtottuk. A realizálhatĂłsági vesztesĂ©g Hinf, Linf normák szerinti optimalitását a szabályozĂłk - speciális Nevanlinna-Pick approximáciĂłs egyenletek alapján számolt - belsĹ‘ szűrĹ‘inek alkalmazásával biztosĂtottuk. A H2, Hinf normák alkalmazásával csak nem integrálĂł optimális szabályozĂł nyerhetĹ‘. Optimális integrálĂł szabályozĂłhoz az eredeti normákat speciális ""energia"" illetve ""supremum"" normákká kellett kiegĂ©szĂteni az L2, Linf normák egyidejű alkalmazásával Ă©s nem Dirac-delta alakĂş gerjesztĂ©s feltĂ©telezĂ©sĂ©vel. Ăšj iteratĂv mĂłdszert vezettĂĽnk be a modellezĂ©si vesztesĂ©g optimalizálására is. | A new method was developed for design of the (reachable) best controllers for LPI processes when the activator has an amplitude constraint and the process has invariant properties. A procedure was suggested to compute the best (reachable) reference model for tracking and disturbance rejection. A new approach was introduced to minimize the realizability degradation part of the sensitivity function using nominal process models. This optimization uses Youla parametrized regulators for open-loop stable plants. H2, Hinf and L2, Linf norms are used in this procedure. The H2, L2 norm based optimization uses special Diophantine equation to calculate the optimal embedded filter in the regulators. The Hinf, Linf norm based optimization uses special Nevanlinna-Pick approximation to calculate the optimal imbedded filter in the regulators. The original norm formulation was used in a combined way forming general ''energy'' and ''supremum'' norms assuming higher order excitations than the Dirac-delta to ensure integrating optimal regulators, too. New iterative algorithm was developed to minimize the modeling degradation part of the sensitivity function
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