In this paper, we present a new prescribed-time distributed control method for consensus and containment of networked multiple systems. Different from both regular finite-time (where the finite settling time is not uniform in initial conditions) fixed-time cannot be preassigned arbitrarily), proposed one built upon novel scaling function, resulting prespecifiable convergence (the can as needed within any physically allowable range). Furthermore, developed scheme only ensures that all agents...

This paper studies the distributed consensus problem of multiagent systems (MASs) in presence nonidentical unknown nonlinear dynamics and undetectable actuation failures. Of particular interest is development a robust adaptive fault-tolerant protocol capable compensating uncertain dynamics/disturbances time-varying yet unpredictable failures simultaneously. By introducing virtual parameter estimation error into artfully chosen Lyapunov function, solved with control scheme based upon local...

Summary This paper provides a time‐varying feedback alternative to control of finite‐time systems, which is referred as “prescribed‐time control,” exhibiting several superior features: (i) such gain–based prescribed‐time built upon regular state rather than fractional‐power feedback, thus resulting in smooth ( C m ) action everywhere during the entire operation system; (ii) characterized with uniformly prespecifiable convergence time that can be preassigned needed within physically allowable...

It is a long lasting open problem to synthesize general PI control for nonlinear systems with its gains analytically determined, yet ensuring stability and transient performance. The further complicated if modeling uncertainties external disturbances as well actuation failures are involved in the systems. In this note, generalized adaptively adjusting presented, which gracefully avoids adhoc time-consuming "trial error" process determining traditional control; collectively accommodates...

In this paper, the problem of containment control networked multiagent systems is considered with special emphasis on finite-time convergence. A distributed neural adaptive scheme for developed, which, different from current state art, able to achieve dynamic in finite time sufficient accuracy despite unknown nonaffine dynamics and mismatched uncertainties. Such a feature, highly desirable practice, made possible by fraction surface design technique based concept virtual filter. proposed...

This paper presents a distributed adaptive finite-time control solution to the formation-containment problem for multiple networked systems with uncertain nonlinear dynamics and directed communication constraints. By integrating special topology feature of new constructed symmetrical matrix, technical difficulty in arising from asymmetrical Laplacian matrix under single-way is circumvented. Based upon fractional power feedback local error, an scheme established drive leaders into...

This paper investigates the tracking control problem of dynamic systems consisting physically connected subsystems with virtual connections through local communication, where unknown unidentical nonlinearities, time-varying yet undetectable actuation faults, and varying authorities are involved. The communication nature physical uncertain interactions among subsystems, together unpredictable failures authority variation, make underlying nontrivial, calling for a solution that is not only...

This article addresses the distributed finite-time attitude tracking control problem for a group of uncertain rigid spacecraft in presence unavailable angular velocity under directed topology condition. First, adaptive neural network observer is proposed each follower to estimate its own velocity. Unlike existing velocity-observer-based design methods, one does not need exact knowledge system model, and works well systems with both vanishing nonvanishing uncertainties. Further, another...

In this article, we investigate the prescribed performance tracking control problem for high-order nonlinear multiagent systems (MASs) under directed communication topology and unknown directions. Different from most existing consensus methods where certain initial conditions are needed to be satisfied, here restriction related is removed global result irrespective of condition established. Furthermore, output achieved asymptotically with arbitrarily transient in spite Our development...

In this article, we address the prescribed finite time control problem for a class of strict-feedback systems with unknown parameters. A backstepping-based adaptive prescribed-time algorithm is proposed second-order systems, where global stability system ensured, and dynamic surface (DSC)-based designed in high-order case. For DSC-based method, novel first-order filter constructed to guarantee boundedness "virtual error," which avoids so-called "differential explosion" problem, however,...

This paper investigates the prescribed-time control (PTC) problem for a class of strict-feedback systems subject to non-vanishing uncertainties. The coexistence mismatched uncertainties and disturbances makes PTC synthesis nontrivial. In this work, method that does not involve infinite time-varying gain is proposed, leading practical global prescribed time tracking solution systems, in spite both Different from methods based on switching avoid issue involves discontinuity at point, our...

This paper investigates the problem of achieving rotating formation and containment simultaneously via finite time control schemes for multiagent systems. It is nontrivial to maintain where desired structure time-varying only neighboring information available. The underlying becomes even more complicated if imposed yet convergence required at same time. To tackle this problem, a polar coordinate-based approach exploited in paper. Finite protocols are established leader agents follower...

In this paper, we investigate the consensus tracking control problem for networked multiagent systems (MASs) with unknown nonaffine dynamics. Our goal is to achieve asymptotic (rather than ultimately uniformly bounded) tracking, which quite challenging especially if nonvanishing/nonparametric uncertainties are involved and at same time protocol required be fully distributed continuous everywhere. Here, present a conceptually new structurally simple solution action. The developed method...

S-Glycosides have broad biological activities and serve as stable mimics of natural O-glycoside counterparts thus are great therapeutic potential. Herein we disclose an efficient method for the stereospecific synthesis 1-thioglycosides via a boron-promoted reductive deoxygenation coupling reaction from readily accessible sulfonyl chlorides glycosyl bromides. Our protocol features mild conditions excellent functional group tolerance stereoselectivity. The translational potential this...