The gear pump is widely applied in aircraft fuel systems due to its reliable performance and low cost. It one of the most critical components control system. However, failure mechanism airborne pumps complex challenging operating conditions, including wide temperature ranges, varying load sequences, strong vibrations. This paper focuses on wear floating bearing aviation constructs degradation process model. First, a dynamics model established demonstrate that bearings primarily experience...

Introduction: This study aimed to explore the effect of Clostridia administration on ovalbumin (OVA)-induced allergy and relevant underlying mechanism in BALB/c mice. Methods: Female mice were assigned three groups: control (C), OVA sensitization (CO), intervention (IG). All treated with antibiotics eliminate their intestinal flora. Then, CO IG groups orally phosphate-buffered saline (PBS) extract, respectively, followed by sensitization, while C group only received PBS during experiment....

In this study, the event‐triggered leader‐following consensus problem for multi‐agent systems with external disturbances is addressed under fixed and switching topologies. First, based on an extended state observer, a novel distributed protocol designed topology to achieve disturbance rejection eliminate Zeno behaviour. Second, case of topologies which do not always have directed spanning tree, observer‐based proposed topology‐dependent average dwell time. Moreover, both protocols presented...

Abstract In this article, the leader–follower consensus problem is considered for a class of nonlinear multiagent systems with event‐triggered inputs. A novel time‐varying gain compensator designed each follower by only utilizing output information and its neighbors. Based on threshold strategy directed communication topology, distributed feedback controller follower. It proved Lyapunov theory that achieved Zeno‐behavior avoided. Compared existing results, it first time control algorithm...

Abstract Most existing path following control approaches for underactuated Autonomous underwater vehicles (AUVs) assumed that the roll angle can be passively stabilized at zero, and simplified problem to 5‐degree‐of‐freedom model. However, in practice, motion suffers from undesirable oscillations induced by environmental disturbances, unbalanced propeller torque, etc. To preserve stability of system under nonzero dynamics, this paper proposes a novel line‐of‐sight‐ (LOS) guided approach....

Abstract In this paper, the leader–follower consensus problem is investigated for multi‐agent systems subject to external disturbances generated by heterogeneous nonlinear exosystems. First, disturbance observers are developed each follower effectively estimate disturbances. Then, based on presented observers, distributed state and output feedback protocols proposed guarantee that tracking errors converge zero asymptotically, meanwhile reject Particularly, protocol can be designed...

An SEIR type of compartmental model with nonlinear incidence and recovery rates was formulated to study the combined impacts psychological effect available resources public health system especially number hospital beds on transmission control A(H7N9) virus. Global stability disease-free endemic equilibria is determined by basic reproduction as a threshold parameter obtained constructing Lyapunov function second additive compound matrix. The results reveal that do not change steady states but...

In this paper, the formation tracking control problem is addressed for feedforward nonlinear multi-agent systems with dead-zone input. For each follower, a dynamic observer constructed by output information of itself and its neighbours. Based on observer, distributed protocol designed bounded time-varying gain to achieve between follower leader. It should be pointed out that has fewer communication variables simpler structure, while improving convergence speed transient performance system....

Abstract In this paper, the bipartite consensus problem is addressed via adaptive event‐triggered control for multi‐agent systems in directed communication networks, where cooperative and competitive interactions are considered simultaneously. Under a strongly connected digraph, novel fully distributed protocol first put forward, which consists of an controller two mechanisms. The flexible capable achieving without employing global information. Meanwhile, Zeno behavior cannot occur by...

Based on energy-based multiple Lyapunov functions approaches, this article concerns with stabilization and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mathcal {H}_{\infty }$ </tex-math></inline-formula> control for switched uncertain port-controlled Hamiltonian (SUPCH) systems mode-dependent average dwell time (MDADT) switching. To better deal the uncertainties of each mode, an improved MDADT scheme...

Abstract This paper investigates the periodic event‐triggered bipartite consensus for single integral multi‐agent systems. A fully distributed protocol is designed a general case that only partial information can be transmitted among agents. Then, we construct state‐dependent and time‐dependent event detector to determine whether sampled data should sent out at sampling instants. Under structurally balanced signed digraphs, it proved all agents achieve with same magnitude but opposite sign....

In this paper, the adaptive output feedback asymptotic tracking problem is investigated for nonlinear systems with dead-zone input and unknown nonlinearities, where only system available. First, an observer constructed to estimate unavailable states. Then, by barrier Lyapunov function, controller designed, which compensates influence of nonlinearities. Furthermore, based on proposed tuning global boundedness all signals in closed-loop achieved, error can asymptotically converge zero....

In this article, the bipartite output consensus problem is investigated for heterogeneous multi-agent systems with event-triggered transmission under a signed digraph. It allowed that part of followers have no knowledge leader generated by exosystem. Two novel distributed adaptive observers are first constructed together mechanisms each follower. Specifically, these two effective to realize asymptotic estimations exosystem matrices and state without Zeno behavior. Based on obtained...

Summary In this article, finite‐time boundedness (FTB) and control are addressed for a class of port‐controlled Hamiltonian (PCH) systems with parametric perturbations. Based on adaptive state feedback strategies, sufficient conditions obtained FTB the PCH perturbation external disturbances. Furthermore, another controller is applied to compensate parameter attenuate disturbances, acquired addition, also given uncertain nonlinear via realization method. Finally, numerical simulations...

In this paper, the distributed fault-tolerant consensus control problem is studied for multi-agent systems with event-triggered communication. Unknown time-varying actuator faults including partial loss of effectiveness and bias are taken into consideration. For sake fault compensations, a novel law put forward via adaptive technique in leaderless network. Then, two mechanisms constructed, positive L1 function introduced therein greatly useful scheduling information transmission as well...