Open AccessDesign and operating mode analysis of hybrid actuation system based on EHA/SHA
Author(s) -
Zidong Liu,
Zhiqiang Bai,
Shuhan Xu
Publication year - 2018
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.0050
Subject(s) - control theory (sociology) , actuator , electro hydraulic actuator , position (finance) , computer science , servomechanism , mode (computer interface) , redundancy (engineering) , control engineering , engineering , control (management) , finance , artificial intelligence , economics , operating system
By analysing the structure and working principle of hybrid actuation system (HAS) which consists of a servo‐hydraulic actuator (SHA) and an electro‐hydrostatic actuator (EHA), the overall mathematical model with dissimilar redundancy conforms is established, which considers various influencing factors, such as air load and attachment stiffness. Furthermore, the mechanism of dynamic force fighting is expounded. In addition, a new control strategy which uses the trajectory generator and weight coefficient theory is proposed to restrain the force fighting. The modelling and simulation analysis between the new control strategy and a conventional proportional–integral–derivative control strategy is carried out as well. Based on the above researches, quantitative analysis is carried out on the procedure of operating mode switching, which is from active/active mode to active/passive mode. The results indicate that the position/velocity trade‐off control strategy has a good control performance, and effectively restrains the static force fighting as well as dynamic force fighting. Besides that, it can also shorten the system response time. The HAS can still meet the actuating requirements after the operating mode switches to active/passive mode. The actuator in passive state generates a certain static error by the reason of tracking the position of the control surface.