12 research outputs found

    Periodic Event-Triggered Sampling and Dual-Rate Control for a Wireless Networked Control System With Applications to UAVs

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    © 2019 IEEE. Personal use of this material is permitted. Permissíon from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertisíng or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works."[EN] In this paper, periodic event-triggered sampling and dual-rate control techniques are integrated in a wireless networked control system (WNCS), where time-varying network-induced delays and packet disorder are present. Compared to the conventional time-triggered sampling paradigm, the control solution is able to considerably reduce network utilization (number of transmissions), while retaining a satisfactory control performance. Stability for the proposed WNCS is ensured using linear matrix inequalities. Simulation results show the main benefits of the control approach, which are experimentally validated by means of an unmanned-aerial-vehicle-based test-bed platform.This work was supported in part by the European Commission as part of Project H2020-SEC-2016-2017-Topic: SEC-20-BES-2016 (Id: 740736)-"C2 Advanced Multi-domain Environment and Live Observation Technologies," in part by the European Regional Development Fund as part of OPZuid 2014-2020 under the Drone Safety Cluster project, in part by the Innovational Research Incentives Scheme under the VICI Grant "Wireless control systems: A new frontier in automation" (No. 11382) awarded by The Netherlands Organization for Scientific Research Applied and Engineering Sciences, and in part by the Ministerio de Economia y Competitividad, Spain, under Project FPU15/02008.Cuenca, Á.; Antunes, D.; Castillo-Frasquet, A.; García Gil, PJ.; Asadi Khashooei, B.; Heemels, W. (2019). Periodic Event-Triggered Sampling and Dual-Rate Control for a Wireless Networked Control System With Applications to UAVs. IEEE Transactions on Industrial Electronics. 66(4):3157-3166. https://doi.org/10.1109/TIE.2018.2850018S3157316666

    Rollout strategies for output-based event-triggered control

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    Recent research advocates that replacing the periodic communication paradigm by an event-triggered paradigm can have significant benefits for control systems. While in many event-triggered control solutions transmission decisions are based on full state information, in most applications only partial state information is available for feedback (output measurements). Here we propose an optimization-based output-feedback event-triggered solution for linear discrete-time systems which guarantees a performance bound with respect to periodic control, while reducing the communication load. Performance is measured by a quadratic cost. The usefulness of the results is illustrated through a numerical example

    A consistent threshold-based policy for event-triggered control

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    A consistent event-triggered control (ETC) policy is defined as a policy that outperforms the performance of periodic control for the same average transmission rate and does not generate transmissions in the absence of disturbances. In this letter, we propose a threshold-based policy for periodic ETC that is consistent. Simulation results illustrate the strengths of the proposed method

    Suboptimal event-triggered control over unreliable communication links with experimental validation

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    We propose an event-triggered control policy for a discrete-time linear system with unreliable actuators' and sensors' links, captured by Bernoulli packet dropout models. The proposed policy is a threshold-based policy by which transmissions occur if a weighted norm of an error state vector exceeds a threshold. The threshold and the weights of the norm depend on the underlying characteristics of the packet dropout model. Such a policy is shown to guarantee a given performance, defined in terms of a quadratic cost, while reducing transmissions. The proposed event-triggered control policy is experimentally validated in the context of remotely steering an omni-directional ground robot along a predefined trajectory over an unreliable wireless network, while keeping transmissions to a minimum.</p

    Consistent event-triggered methods for linear quadratic control

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    \u3cp\u3eIn this paper, we define two desired consistency properties for event-triggered control: (i) it should result in a better trade-off between average transmission rate and close-dloop performance than traditional periodic control; (ii) it should require no sensor updates (i.e., operate in open loop) in the absence of disturbances. We propose an event-triggered controller for linear systems with full state feedback that guarantees these two properties when performance is measured by an average quadratic cost. Simulation results highlight the efficiency of the proposed solution.\u3c/p\u3

    Consistent dynamic event-triggered policies for linear quadratic control

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    \u3cp\u3eWe say that an event-triggered control policy is consistent if it achieves a better closed-loop performance than that of traditional periodic control for the same average transmission rate and does not generate transmissions in the absence of disturbances. In this paper, we propose a class of dynamic event-triggered control strategies that satisfy these two conditions for any linear system when performance is measured by an average quadratic cost. A numerical example shows that these conditions may not be necessarily satisfied by a well-known event-triggered policy for which transmissions are triggered if the Euclidean norm of the error between the system's state and a state prediction exceeds a given threshold.\u3c/p\u3

    A consistent threshold-based policy for event-triggered control

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    \u3cp\u3eA consistent event-triggered control (ETC) policy is defined as a policy that outperforms the performance of periodic control for the same average transmission rate and does not generate transmissions in the absence of disturbances. In this letter, we propose a threshold-based policy for periodic ETC that is consistent. Simulation results illustrate the strengths of the proposed method.\u3c/p\u3

    Output-based event-triggered control with performance guarantees

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    We propose an output-based event-triggered control solution for linear discrete-time systems with a performance guarantee relative to periodic time-triggered control, while reducing the communication load. The performance is expressed as an average quadratic cost and the plant is disturbed by Gaussian process and measurement noises. We establish several connections with previous works in the literature discussing, in particular, the relation to absolute and relative threshold policies. The usefulness of the results is illustrated through a numerical example
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