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  • 1.
    Razaq, Muhammad Ahsan
    et al.
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Rehan, Muhammad
    Pakistan Inst Engn & Appl Sci PIEAS, Pakistan.
    Hussain, Muntazir
    Air Univ, Pakistan.
    Ahmed, Shakeel
    Pakistan Inst Engn & Appl Sci PIEAS, Pakistan.
    Hong, Keum-Shik
    Qingdao Univ, Peoples R China; Pusan Natl Univ, South Korea.
    Observer-based leader-following consensus of one-sided Lipschitz multi-agent systems over input saturation and directed graphs2023In: Asian Journal of Control, ISSN 1561-8625, E-ISSN 1934-6093, Vol. 25, no 5, p. 4096-4112Article in journal (Refereed)
    Abstract [en]

    This paper investigates a local observer-based leader-following consensus control of one-sided Lipschitz (OSL) multi-agent systems (MASs) under input saturation. The proposed consensus control scheme has been formulated by using the OSL property, input saturation, directed graphs, estimated states, and quadratic inner-boundedness condition by attaining the regional stability. It is assumed that the graph always includes a (directed) spanning tree with respect to the leader root to develop matrix inequalities for investigating parameters of the proposed observer and consensus protocols. Further, a new observer-based consensus tracking method for MASs with saturation, concerning independent topologies for communicating outputs and estimates over the network, is explored to deal with a more perplexing and realistic situation. In contrast to the traditional methods, the proposed consensus approach considers output feedback and deals with the input saturation for a generalized class of nonlinear systems. The efficiency of the obtained results is illustrated via application to a group of five moving agents in the Cartesian coordinates.

  • 2.
    Razaq, Muhammad Ahsan
    et al.
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Altafini, Claudio
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Propagation of Stubborn Opinions on Signed Graphs2023In: 2023 62ND IEEE CONFERENCE ON DECISION AND CONTROL, CDC, IEEE , 2023, p. 491-496Conference paper (Refereed)
    Abstract [en]

    This paper addresses the problem of propagation of opinions in a Signed Friedkin-Johnsen (SFJ) model, i.e., an opinion dynamics model in which the agents are stubborn and the interaction graph is signed. We provide sufficient conditions for the stability of the SFJ model and for convergence to consensus of a concatenation of such SFJ models.

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