Event‐triggered adaptive control of strict‐feedback nonlinear systems under output constraints and unknown control direction

Wang, Chao; Wang, Yujuan; Dai, Yunfei; Ma, Yu

doi:10.1002/rnc.6672

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…This strategy is based on periodically sampled signals, hence it can avoid the Zeno phenomenon in mechanism, moreover, it has been shown that it can further reduce the communication frequency compared with the continuous strategy. From another point of view, ETC strategies can be classified as the static ETC (SETC) strategy [2][3][4][5] and the dynamic ETC (DETC) strategy [6][7][8][9]. In the SETC strategy, the triggering instants are determined by a static trigger function depending on the current state signal and the last transmitted one.…”

Section: Introductionmentioning

confidence: 99%

Switching periodic event‐triggered global prescribed performance control of uncertain strict‐feedback systems with sensor faults

Xu,

Zhang,

Hou

2024

IET Control Theory & Appl

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This study investigates the global adaptive prescribed performance control (PPC) of a class of uncertain strict‐feedback nonlinear systems with sensor faults based on the switching periodic event‐triggering mechanism (SPETM). Due to the existence of sensor faults, the controlled system is first remodeled by utilizing the available variables. To reduce the communication frequency, a novel SPETM is proposed by combining the advantages of the static and the dynamic event‐triggering mechanisms. This mechanism can not only avoid continuously monitoring the event‐triggering condition and avoid the Zeno phenomenon in mechanism, but also reduce the trigger frequency while ensuring the system performance by adjusting the event‐triggering threshold dynamically. Meanwhile, a time‐varying scaling function, whose reciprocal is considered as a prescribed performance function, is designed to achieve the global PPC by combining the nonlinear transformation technique. The adaptive control algorithm design is completed by employing the backstepping methodology, which can guarantee that all closed‐loop signals are bounded and the actual system output signal evolves within the prescribed performance boundary for arbitrary initial values. The effectiveness and the advantages of the proposed control algorithm are illustrated through an application example of the network‐based robotic manipulator system.

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Section: Introductionmentioning

confidence: 99%

Switching periodic event‐triggered global prescribed performance control of uncertain strict‐feedback systems with sensor faults

Xu,

Zhang,

Hou

2024

IET Control Theory & Appl

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“…An event‐triggered communication or transmission mechanism has been proposed to save resources, such as References 10,11. Compared with conventional time‐triggered control, event‐triggered control (ETC) offers efficiencies in communication as the updating of control only occurs when the system needs it while retaining the required closed‐loop performance 12,13 . The first important issue with ETC is ensuring that the minimum inter‐event time (the minimum time interval between two consecutive events) is more significant than some normal number.…”

Section: Introductionmentioning

confidence: 99%

Event‐triggered control of Itô stochastic nonlinear delayed systems with state quantization

Sun,

Deng,

2023

Intl J Robust & Nonlinear

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The problem of event‐triggered control (ETC) of stochastic nonlinear delayed systems with state quantization is investigated. In order to reduce the communication burden and computational cost, an ETC mechanism and state quantization are introduced in the control scheme. Two configurations are considered to investigate their interaction: quantization before event‐trigger (QE) and quantization after event‐trigger (EQ), respectively. Based on this, a static event‐triggered mechanism (ETM) is designed while avoiding the Zeno phenomenon. The system allows known input‐to‐state stability (ISS) control law, followed by utilizing the Halanay inequality to achieve stabilization. In both configurations, the stabilization of the closed‐loop system is guaranteed. We show that communication times can be reduced by adjusting parameters and selecting the suitable configuration. Moreover, to further enhance resource conservation, we illustrate the feasibility of dynamic ETMs in this framework. Numerical simulation results validate the effectiveness of the proposed ETC schemes.

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Improved prescribed performance control for nonlinear systems with unknown control direction and input dead‐zone

Huang,

Li,

Long

et al. 2024

Intl J Robust & Nonlinear

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In view of the input dead‐zone, unknown control direction and difficulty in satisfying the prescribed performance that suffered in practical systems, an improved prescribed performance‐based adaptive control scheme is stressed for uncertain nonlinear systems in this paper. Firstly, by adopting a characteristic function, the input dead‐zone is linearized to a model with bounded perturbation. To settle the “computation complexity” issue, an adaptive controller is built via command filter design method, where the fuzzy logic systems are introduced to approximate the unknown nonlinearities. Meanwhile, the Nussbaum function is brought in controller design to counter the hardship of unknown control direction. Besides, the tracking error can be restricted in the prescribed boundary in finite time with the improved performance function. The presented control approach can not only ensure the finite‐time convergence property of tracking error and the boundedness of all signals in the closed‐loop system, but also easily implement in engineering. Finally, the simulation examples confirm the validity of the designed control scheme.

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Event‐triggered adaptive control of strict‐feedback nonlinear systems under output constraints and unknown control direction

Cited by 5 publications

References 28 publications

Switching periodic event‐triggered global prescribed performance control of uncertain strict‐feedback systems with sensor faults

Switching periodic event‐triggered global prescribed performance control of uncertain strict‐feedback systems with sensor faults

Event‐triggered control of Itô stochastic nonlinear delayed systems with state quantization

Improved prescribed performance control for nonlinear systems with unknown control direction and input dead‐zone

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