scholarly journals Formation Control for Multiple Quadrotor Aircraft via Fixed-time Consensus Algorithm

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Xiaohua Zhang ◽  
Junli Gao ◽  
Wenfeng Zhang ◽  
Tao Zeng ◽  
Liping Ye

This paper mainly studies the formation control problem of multiple quadrotor aircraft via fixed-time control theory. First, based on the bilimit homogeneous theory and the framework of multiagent theory, for multiaircraft, a fixed-time formation control strategy is proposed. Considering the external disturbance existing on the attitude loop of the aircraft, the corresponding fixed-time disturbance observer is designed with the observer technology. Then, a fixed-time attitude controller is designed based on the accurate observation and fast compensation from the disturbance observer. Finally, some simulations are performed to verify the effectiveness of the proposed theoretical method.

Author(s):  
Heli Gao ◽  
Mou Chen

This paper studies the fixed-time disturbance estimate and tracking control for two-link manipulators subjected to external disturbance. A fixed-time extended-state disturbance observer (FxTESDO) is proposed by improving the extended state observer. Also, a fixed-time inverse dynamics tracking control (FxTIDTC) scheme based on the FxTESDO is given for two-link manipulators. The fixed-time convergence of the FxTESDO and FxTIDTC is proved by the Lyapunov stability theory and with the aid of the bi-limit homogeneous technique. Numerical simulations are employed to illustrate the effectiveness of the proposed FxTIDTC.


Author(s):  
Danghui Yan ◽  
Weiguo Zhang ◽  
Hang Chen ◽  
Jingping Shi

A consensus-based sliding mode formation control algorithm for the multi-unmanned-aerial-vehicles'(multi-UAVs') system with delay and disturbance constraints in three dimensional(3D) environment is presented. Firstly, a consensus algorithm is presented by considering the time delay. Secondly, the trajectory tracking and robustness of the formation system to the external disturbance is ensured by using the sliding mode controller(SMC). The effectiveness of the present algorithms is verified by the simulation results.


2021 ◽  
Author(s):  
Zhenyu Gao ◽  
Yi Zhang ◽  
Ge Guo

Abstract This paper is concerned with formation control of autonomous underwater vehicles (AUVs), focusing on improving system convergence speed and overcoming velocity measurement limitation. By employing the fixed-time control theory and command filtering technique, a full state feedback formation algorithm is proposed, which makes the follower AUV track the leader in a given time with all signals in the system globally practically stabilized in fixed time. To avoid degraded control performance due to inaccurate velocity measurement, a fixed-time convergent observer is designed to estimate the velocity of AUVs. We then give an observer-based fixed-time control method, with which acceptable formation tracking performance can be achieved in fixed time without velocity measurement. The effectiveness and performance of the proposed method is demonstrated by numerical simulations.


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