Force-fight problem in control of aileron’s plane

Ying Zhang, Zhaohui Yuan

COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(4) 255-261

School of automation, Northwestern Polytechnical University, Xi’an, China

In order to reduce or eliminate the force-fight phenomenon of single feedback loop of redundant-channels, modelling the whole control system on the basis of analysing the structure of aileron, the correctness of the model is verified by experiments. Simulation results show that set the dead band of the valve which control the feedback loop smaller is conducive to the decrease of system’s fighting-force; for every reduce in the difference of the two valves’ overlap of 0.01mm, the fighting-force decreases one time; when the driving speed is more than 50mm/s, system abstains smaller fighting-force. Therefore, the optimization of structure parameters can reduce fighting-force effectively. When the parameters of valves and driving speed is restricted, another method of using a bypass orifice to connect the two cavities of the cylinder is proposed to solve the problem, simulation results shows that fighting-force reduce 2000N for every increase in the orifice’s diameter of 0.1mm when using the fixed orifice, and using the variable orifice can abstain a small fighting-force and meanwhile reduce the wastage of hydraulic oil.