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This paper investigates the problem of formation control for multi-agent systems with general linear dynamics and input saturation. The time-varying formation tracking this paper deal with is required to be piecewise differentiable. Firstly, a time-varying formation control protocol is presented. Then an algorithm consisting of 3 steps to design the formation control protocol is proposed. As follows,...
An in-flight aerodynamic coefficient estimation method is proposed for nonlinear lateral motion of reusable launch vehicle via retrospective cost adaptive control theory. The estimated aerodynamic coefficient is then utilized for adaptive controller switch to cope with unexpected polarity change of LCDP(Lateral Control Departure Parameter) online. First, the nonlinear lateral dynamics of a reusable...
This paper investigates the problem of event-triggered formation control for multi-agent systems. The time-varying formation this paper deal with can be specified/described by piecewise differentiable vectors. Firstly, a event-triggered based time-varying formation control protocol is constructed using local neighboring information. Then an algorithm consisting of two steps to design the event-triggered...
Time-varying group formation control problems for second-order multi-agent systems with directed topologies are investigated, where the agents in the multi-agent system are classified into subgroups and each subgroup is required to form a specified time-varying sub-formation. In contrast to the traditional complete formation, where only one formation is realized by the multi-agent system, in the group...
Reusable launch vehicle (RLV) has multiple different kinds of control effectors. These redundant effectors provide RLV the potential to maintain acceptable stability and performance even when some of them get failures. Proper control allocation and re-allocation after control effectors failure are necessary for RLV. A new fault-tolerant reconfigurable controller integrating control allocation is proposed...
According to attitude control of a hypersonic gliding vehicle, a decoupling control approach based on NESO is proposed. Decoupling control is realized through the decentralized control theory. The system coupling terms and uncertainties are estimated by NESO and added into the control law for compensation. Theoretical analysis proves that the tracking errors of the closed-loop system are consistently...
Modern aircrafts are configured with many control surfaces to enhance the reliability, maneuverability and survivability. To make full use of the redundant control surfaces and distribute the control power without exceeding the saturations, control allocation is introduced into the control system. An effective control re-allocation may achieve acceptable stability and performance in case of control...
To solve the re-entry control problem of suborbital vehicle, which has a large dynamic range and uncertainty, a dynamic inversion control system based on time-scale and linear feedback was presented. There is no gain scheduling required in this controller, and it can adapt to the nonlinear, strong-coupled plant characteristics and large-scale changes of the environment. This controller also decreases...
A new scheme of incorporating the fault tolerance and disturbance rejection in an existing flight control system is proposed. Method to design a standalone compensator is suggested which is added to the original system in order to guarantee the system stability and performance in the presence of fault or disturbances. Thus the controller, which is designed separately considering all the design parameters...
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