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• W2580772829 abstract "In this thesis, control algorithms are studied that are tailored for platforms with limited computation and communication resources. The interest in such control algorithms is motivated by the fact that nowadays control algorithms are implemented on small and inexpensive embedded microprocessors and that the sensors, actuators and controllers are connected through multipurpose communication networks. To handle the fact that computation power is no longer abundant and that communication networks do not have in finite bandwidth, the control algorithms need to be either robust for the deficiencies induced by these constraints, or they need to optimally utilise the available computation and communication resources. In this thesis, methodologies for the design and analysis of control algorithms with such properties are developed. Networked Control Systems: In the first part of the thesis, so-called networked control systems (NCSs) are studied. The control algorithms studied in this part of the thesis can be seen as conventional sampled-data controllers that need to be robust against the artefacts introduced by using a finite bandwidth communication channel. The network-induced phenomena that are considered in this thesis are time-varying transmission intervals, time-varying delays, packet dropouts and communication constraints. The latter phenomenon causes that not all sensor and actuator data can be transmitted simultaneously and, therefore, a scheduling protocol is needed to orchestrate when to transmit what data over the network. To analyse the stability of the NCSs, a discrete-time modelling framework is presented and, in particular, two cases are considered: in the first case, the transmission intervals and delays are assumed to be upper and lower bounded, and in the second case, they are described by a random process, satisfying a continuous joint probability distribution. Both cases are relevant. The former case requires a less detailed description of the network behaviour than the latter case, while the latter results in a less conservative stability analysis than the former. This allows to make a tradeoff between modelling accuracy (of network-induced effects) and conservatism in the stability analysis. In both cases, linear plants and controllers are considered and the NCS is modelled as a discrete-time switched linear parameter-varying system. To assess the stability of this system, novel polytopic overapproximations are developed, which allows the stability of the NCS to be studied using a finite number of linear matrix inequalities. It will be shown that this approach reduces conservatism significantly with respect to existing results in the literature and allows for studying larger classes of controllers, including discrete-time dynamical output-based controllers. Hence, the main contribution of this part of the thesis is the development of a new and general framework to analyse the stability of NCSs subject to four network-induced phenomena in a hardly conservative manner. Event-Triggered Control Systems: In the second part of the thesis, socalled event-triggered control (ETC) systems are studied. ETC is a control strategy in which the control task is executed after the occurrence of an external event, rather than the elapse of a certain period of time as in conventional periodic control. In this way, ETC can be designed to only provide control updates when needed and, thereby, to optimally utilise the available computation and communication resources. This part of the thesis consists of three main contributions in this appealing area of research. The first contribution is the extension of the existing results on ETC towards dynamical output-based feedback controllers, instead of state-feedback control, as is common in the majority of the literature on ETC. Furthermore, extensions towards decentralised event triggering are presented. These extensions are important for practical implementations of ETC, as in many control applications the full state is hardly ever available for feedback, and sensors and actuators are often physically distributed, which prohibits the use of centralised event-triggering conditions. To study the stability and the L1-performance of this ETC system, a modelling framework based on impulsive systems is developed. Furthermore, for the novel output-based decentralised event-triggering conditions that are proposed, it is shown how nonzero lower bounds on the minimum inter-event times can be guaranteed and how they can be computed. The second contribution is the proposition of the new class of periodic event-triggered control (PETC) algorithms, where the objective is to combine the benefits that, on the one hand, periodic control and, on the other hand, ETC offer. In PETC, the event-triggering condition is monitored periodically and at each sampling instant it is decided whether or not to transmit the data and to use computation resources for the control task. Such an event-triggering condition has several benefits, including the inherent existence of a minimum inter-event time, which can be tuned directly. Furthermore, the fact that the event-triggering condition is only verified at the periodic sampling times, instead of continuously, makes it possible to implement this strategy in standard time-sliced embedded software architectures. To analyse the stability and the L2-performance for these PETC systems, methodologies based on piecewiselinear systems models and impulsive system models will be provided, leading to an effective analysis framework for PETC. Finally, a novel approach to solving the codesign problem of both the feedback control algorithm and the event-triggering condition is presented. In particular, a novel way to solve the minimum attention and anytime attention control problems is proposed. In minimum attention control, the `attention' that a control task requires is minimised, and in anytime attention control, the performance under the `attention' given by a scheduler is maximised. In this context, `attention' is interpreted as the inverse of the time elapsed between two consecutive executions of a control task. The two control problems are solved by formulating them as linear programs, which can be solved efficiently in an online fashion. This offers a new and elegant way to solve both the minimum attention control problem and the anytime attention control problem in one unifying framework. The contributions presented in this thesis can form a basis for future research explorations that can eventually lead to a mature system theory for both NCSs and ETC systems, which are indispensable for the deployment of NCSs and ETC systems in a large variety of practical control applications." @default.
• W2580772829 created "2017-02-03" @default.
• W2580772829 creator A5025873475 @default.
• W2580772829 date "2011-01-01" @default.
• W2580772829 modified "2023-09-23" @default.
• W2580772829 title "Networked and event-triggered control systems" @default.
• W2580772829 cites W1490978409 @default.
• W2580772829 cites W1492994364 @default.
• W2580772829 cites W1511213320 @default.
• W2580772829 cites W1511275238 @default.
• W2580772829 cites W1527922291 @default.
• W2580772829 cites W1536220597 @default.
• W2580772829 cites W1539427630 @default.
• W2580772829 cites W1540950870 @default.
• W2580772829 cites W1569476912 @default.
• W2580772829 cites W1579118835 @default.
• W2580772829 cites W1607385133 @default.
• W2580772829 cites W1685524015 @default.
• W2580772829 cites W1731458738 @default.
• W2580772829 cites W1799406242 @default.
• W2580772829 cites W1855336155 @default.
• W2580772829 cites W1868559974 @default.
• W2580772829 cites W1942887719 @default.
• W2580772829 cites W1962041330 @default.
• W2580772829 cites W1964968026 @default.
• W2580772829 cites W1966423558 @default.
• W2580772829 cites W1968385553 @default.
• W2580772829 cites W1974296145 @default.
• W2580772829 cites W1978044665 @default.
• W2580772829 cites W1978518835 @default.
• W2580772829 cites W1978848993 @default.
• W2580772829 cites W1981066143 @default.
• W2580772829 cites W1983491872 @default.
• W2580772829 cites W1983688754 @default.
• W2580772829 cites W1986122249 @default.
• W2580772829 cites W1991153786 @default.
• W2580772829 cites W1991721926 @default.
• W2580772829 cites W1996058270 @default.
• W2580772829 cites W1998151680 @default.
• W2580772829 cites W1999448703 @default.
• W2580772829 cites W2001967263 @default.
• W2580772829 cites W2002027000 @default.
• W2580772829 cites W2006446862 @default.
• W2580772829 cites W2007527329 @default.
• W2580772829 cites W2008151824 @default.
• W2580772829 cites W2009102111 @default.
• W2580772829 cites W2015548130 @default.
• W2580772829 cites W2020327078 @default.
• W2580772829 cites W2023126268 @default.
• W2580772829 cites W2032445885 @default.
• W2580772829 cites W2033017950 @default.
• W2580772829 cites W2034071287 @default.
• W2580772829 cites W2035605646 @default.
• W2580772829 cites W2043363105 @default.
• W2580772829 cites W2044741154 @default.
• W2580772829 cites W2046921524 @default.
• W2580772829 cites W2052334067 @default.
• W2580772829 cites W2054161434 @default.
• W2580772829 cites W2055199656 @default.
• W2580772829 cites W2055572820 @default.
• W2580772829 cites W2062175538 @default.
• W2580772829 cites W2065983905 @default.
• W2580772829 cites W2067817755 @default.
• W2580772829 cites W2069217348 @default.
• W2580772829 cites W2072508748 @default.
• W2580772829 cites W2073249926 @default.
• W2580772829 cites W207393872 @default.
• W2580772829 cites W2075309787 @default.
• W2580772829 cites W2079538138 @default.
• W2580772829 cites W2080106578 @default.
• W2580772829 cites W2082614255 @default.
• W2580772829 cites W2084209135 @default.
• W2580772829 cites W2085648365 @default.
• W2580772829 cites W2087191643 @default.
• W2580772829 cites W2093048429 @default.
• W2580772829 cites W2095477585 @default.
• W2580772829 cites W2095620344 @default.
• W2580772829 cites W2095907778 @default.
• W2580772829 cites W2096338058 @default.
• W2580772829 cites W2098954338 @default.
• W2580772829 cites W2099308299 @default.
• W2580772829 cites W2100700669 @default.
• W2580772829 cites W2100815285 @default.
• W2580772829 cites W2101002859 @default.
• W2580772829 cites W2104460138 @default.
• W2580772829 cites W2104932201 @default.
• W2580772829 cites W2107963329 @default.
• W2580772829 cites W2109625504 @default.
• W2580772829 cites W2110382128 @default.
• W2580772829 cites W2113183332 @default.
• W2580772829 cites W2113282439 @default.
• W2580772829 cites W2114963607 @default.
• W2580772829 cites W2115958676 @default.
• W2580772829 cites W2116089238 @default.
• W2580772829 cites W2116400466 @default.
• W2580772829 cites W2117790521 @default.
• W2580772829 cites W2117915735 @default.
• W2580772829 cites W2118133052 @default.
• W2580772829 cites W2118420115 @default.
• W2580772829 cites W2120010689 @default.

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