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Composite control system of hybrid-driven mid-altitude airship

Published online by Cambridge University Press:  07 December 2017

L. Chen ,
Q. Dong ,
G. Zhang  and
D. Duan
L. Chen*
Affiliation:
School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai, P.R China
Q. Dong
Affiliation:
Functional Teaching and Research Section, Mudanjiang Medical University, Mudanjiang, P.R China
G. Zhang
Affiliation:
School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai, P.R China
D. Duan
Affiliation:
School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai, P.R China
*
chen2006@sjtu.edu.cn
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Abstract

In general, an airship is equipped with hybrid-heterogeneous actuators: the aerodynamic surfaces, the vectored propellers and the buoyant ballonets. The aerodynamic surfaces have high efficiency in attitude control at high speed. However, vectored propellers are also introduced here for attitude control under the special working condition of low airspeed. Due to the lower thrust-to-weight ratio, the composite control of hybrid-heterogeneous actuators is the primary object in controller design for an airship. In composite attitude control, first the attitude moment allocation between aerodynamic control surfaces and vectored propellers is designed according to different dynamic airspeed, to achieve the smooth motion transition from low to high airspeed, then the weighted generalised inverse (WGI) is used to design the reconfigurable actuator allocation among the homogeneous multi-actuators, where the authority of every actuator can be decided by setting the corresponding value of the weight matrix, thus the control law is unchanged under different actuator configurations. Taking the mid-altitude airship as an example, the simulations of position control, trace tracking and altitude control are provided. Simulation results demonstrate that the attitude moments allocation obtains moment distribution between the aerodynamic surfaces and the vectored propellers under different airspeeds; the reconfigurable actuator allocation achieves a good distribution and reconfiguration among homogeneous actuators, thereby enhancing the reliability of the control system.

Keywords

Hybrid-driven mid-altitude airshipcomposite controlattitude moment allocationreconfigurable actuator allocation
Type
Research Article
Information
The Aeronautical Journal , Volume 122 , Issue 1248 , February 2018 , pp. 173 - 204
Copyright
Copyright © Royal Aeronautical Society 2017 

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