关键词: 力纷争现象, 输入比, 板阀死区, 板阀开口面积梯度, 可变节流孔

Abstract:

To reduce or eliminate the forcefight phenomenon of single feedback loop of redundantchannels, the mechanical transmission structure, plate valves, parallel actuating cylinders, spindle and pipelines of the whole control system were modeled and simulated to obtain the bandwidth frequency of the system and the fightingforce caused by the internal asymmetry of the steeringgear.Then the influences of the system's input ratio,the size of valve's dead zone and the gradient of the valve's open area on the system's fightingforce and response speed were studied. Simulation results show that setting the dead zone of the valve which controls the feedback loop smaller is conducive to the decrease of system's fightingforce, and with the increase of the input ratio the fightingforce will be reduced greatly and the bandwidth will be increased and with the reduce of the valve's dead zone, and the increase of the gradient of the valve's open area, the bandwidth frequency increases, but have no influence on the fightingforce. Therefore, increase the input ratio and reduce the valve's dead zone or appropriate increase the gradient of the valve's open area can improve the dynamic and static performance of the system. Finally, a method of setting a variable orifice put forward  to reduce system's fightingforce when these structural parameters cannot be changed, and simulation results prove its feasibility.

Key words: forcefight phenomenon, input ratio, valve dead zone, gradient of the valve open area, variable orifice