8 results on '"Zhao, Haijuan"'
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2. A Novel Asynchronous Sliding Mode Design for Switched Systems under Input–Output Finite-Time Stability.
- Author
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Zhao, Haijuan, Ma, Juan, and Xu, Qinqi
- Subjects
SLIDING mode control ,CLOSED loop systems ,LYAPUNOV functions - Abstract
In this work, the input–output finite-time stability (IO-FTS) of a class of continuous-time switched systems characterized by uncertainties and subjected to external disturbances is studied under asynchronous switching by means of the sliding mode control (SMC) method. The IO-FTS poses a finite-time constraint problem, which involves addressing two main issues: firstly, ensuring that the state trajectory of the switched system reaches the given sliding mode surface within the specified time, and secondly, achieving IO-FTS for the closed-loop switched system during asynchronous switching. To address these issues, we apply a partitioning strategy and construct asynchronous sliding mode controllers with adjustable parameters to ensure the reachability of the system's state trajectory within a finite time. Subsequently, we employ a multiple Lyapunov function (MLF) approach to provide sufficient conditions that ensure IO-FTS during the whole phase [ 0 , T ] for the resulting switched system. Additionally, we analyze the asynchronous characteristics concerning the reachability phase of the designed sliding surface, considering the system's switching properties. Finally, we demonstrate the efficacy of the proposed approach with a numerical example. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
3. Sliding mode control of Lur'e nonlinear switched systems under dynamic schedule protocol.
- Author
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Zhao, Haijuan and Ma, Juan
- Subjects
- *
SLIDING mode control , *NONLINEAR systems , *EXPONENTIAL stability , *DYNAMICAL systems , *QUANTUM cryptography , *CLOSED loop systems , *LYAPUNOV functions - Abstract
In this work, the sliding mode control (SMC) problem is investigated for a class of Lur'e nonlinear switched systems subject to finite channels constraints, which may lead to data collision. To solve this phenomenon, the Weighted Try-Once-Discard (WTOD) protocol is proposed on the sensor-to-controller (S/C) channels to regulate which one sensor node is permitted to send data via the communication network at each instant. A key issue of this work is how to integrate the WTOD protocol into the design of observer and the sliding mode controller for the switched systems. To this end, a token-dependent observer is constructed to estimate the unmeasured states, and then an observer-based SMC law is properly designed. Moreover, by constructing a Lur'e-type Lyapunov function interconnected with a cone-bounded nonlinearity, some sufficient conditions are established such that the reachability with a sliding domain around the specified sliding surface is achieved, meanwhile, the exponential stability of the resultant closed-loop switched systems is guaranteed. Finally, some numerical simulation results are provided. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
4. Secure sliding mode control of interval type‐2 fuzzy systems against intermittent denial‐of‐service attacks.
- Author
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Zhang, Zhina, Niu, Yugang, and Zhao, Haijuan
- Subjects
FUZZY systems ,DENIAL of service attacks ,MEMBERSHIP functions (Fuzzy logic) ,LYAPUNOV functions ,DATA transmission systems ,SYSTEM dynamics ,SLIDING mode control - Abstract
Summary: This article focuses on the sliding mode control of a class of interval type‐2 fuzzy systems with immeasurable states. During the data transmission from the sensor to the controller, the intermittent denial‐of‐service (DoS) attacks may be launched by vicious opponents. A key issue is to evaluate the tolerable region of the attacks for keeping the desired dynamic performance of the controlled interval type‐2 fuzzy systems. To this end, two weighting coefficients are first introduced to construct new membership functions. Based on this, a switched interval type‐2 fuzzy estimator is proposed to estimate the immeasurable state and compensate for the lost measurements caused by DoS attacks. And then, considering different DoS statues, a switched sliding mode controller transiting between the attack free and active cases is synthesized such that the specified sliding surface can be reached. In addition, the acceptable DoS region is quantitatively analyzed via a switched Lyapunov function. It is proven that the input‐to‐state stability of the sliding mode dynamics and the error system can be ensured within this tolerable DoS region. Finally, a simulation example is provided to illustrate the proposed control scheme. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
5. Sliding mode control of discrete‐time switched systems subject to mode delays.
- Author
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Zhao, Haijuan and Niu, Yugang
- Subjects
- *
SLIDING mode control , *DISCRETE-time systems , *CLOSED loop systems , *UNCERTAIN systems , *LYAPUNOV functions , *INFORMATION storage & retrieval systems - Abstract
Summary: This work considers the sliding mode control problem of a class of discrete‐time uncertain switched systems subject to detecting‐delay on mode signals, which may result in the asynchronous phenomenon between the controller and the switched system. Since the mode information of the controlled system is not available for the controller in time, a mode‐independent sliding surface will be introduced, by which an asynchronous sliding mode controller is designed, whose control gain and robust parameter will be changing according to the controller mode. In the analysis on the stability of the closed‐loop control system and the reachability of the specified sliding surface, the asynchronous characteristics are detailedly investigated. It is shown that the Lyapunov function may be not always decreasing along the state trajectories during the unmatched interval of controller modes and system modes. Nevertheless, it is proven that the state trajectories can be driven into a sliding region around the specified sliding surface in finite time. Finally, some numerical simulation results are provided. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
6. Security control of cyber-physical switched systems under Round-Robin protocol: Input-to-state stability in probability.
- Author
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Zhao, Haijuan, Niu, Yugang, and Jia, Tinggang
- Subjects
- *
SLIDING mode control , *PROBABILITY theory , *COMPUTER simulation , *ACTUATORS , *CYBERTERRORISM - Abstract
This work addresses the sliding mode control (SMC) problem for a class of cyber-physical switched systems, in which both the Round-Robin (RR) protocol scheduling and the deception attacks may happen on the controller-to-actuator (C/A) channels. Under the regulation of RR protocol, only one controller node at each instant can access the network and transmit its signal to the corresponding actuator node, that is, the other actuators cannot obtain any new control information. Especially, the transmitted signal could be contaminated by randomly injecting false data. Thus, a key problem is how to design a suitable sliding surface and a desirable sliding mode controller for guaranteeing the dynamic performance of the closed-loop switched systems. To this end, a compensation strategy is proposed for those actuator nodes that don't receive any new control signals at certain instant, based which a token-dependent SMC law is designed. Besides, the method of input-to-state stability in probability (ISSiP) is introduced and the sufficient conditions are established for the reachability of the specified sliding surface and the ISSiP of the resultant switched systems. Finally, some numerical simulation results are provided. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
7. Event-triggered sliding mode control of uncertain switched systems under denial-of-service attacks.
- Author
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Zhao, Haijuan, Niu, Yugang, and Zhao, Jiancong
- Subjects
- *
SLIDING mode control , *UNCERTAIN systems , *DENIAL of service attacks , *EXPONENTIAL stability , *BINOMIAL distribution , *CYBER physical systems - Abstract
This study is concerned with the event-triggered sliding mode control problem for a class of cyber-physical switched systems, in which the Denial-of-Service (DoS) attacks may randomly occur according to the Bernoulli distribution. A key issue is how to design the output feedback sliding mode control (SMC) law for guaranteeing the dynamical performance of the closed-loop system under DoS attacks. To this end, an event-triggered mechanism is firstly introduced to reduce the communication load, under which the measurement signal is transmitted only when a certain triggering condition is satisfied. An usable output signal for the controller is constructed to compensate the effect of unmeasured states and DoS attacks. And then, a dynamic output feedback sliding mode controller is designed by means of the attack probability and the compensated output signals. Both the reachability and the mean-square exponential stability of sliding mode dynamics are investigated and the corresponding sufficient conditions are obtained. Finally, some numerical simulation results are provided. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
8. Finite-time output feedback control of uncertain switched systems via sliding mode design.
- Author
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Zhao, Haijuan, Niu, Yugang, and Song, Jun
- Subjects
- *
SLIDING mode control , *FINITE difference method , *TRAJECTORIES (Mechanics) , *MATHEMATICAL optimization ,MATHEMATICAL models of uncertainty - Abstract
The problem of sliding mode control (SMC) is investigated for a class of uncertain switched systems subject to unmeasurable state and assigned finite (possible short) time constraint. A key issue is how to ensure the finite-time boundedness (FTB) of system state during reaching phase and sliding motion phase. To this end, a state observer is constructed to estimate the unmeasured states. And then, a state estimate-based SMC law is designed such that the state trajectories can be driven onto the specified integral sliding surface during the assigned finite time interval. By means of partitioning strategy, the corresponding FTB over reaching phase and sliding motion phase are guaranteed and the sufficient conditions are derived via average dwell time technique. Finally, an illustrative example is given to illustrate the proposed method. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
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