飞行模拟器操纵负荷系统的数学建模及仿真研究

对飞行模拟器操纵负荷系统进行数学建模,为适应不同模拟对象和不同工作模式杆力特性变化要求,提出了三段式跟踪力模型。分析了驾驶员操纵产生的位移扰动对电液伺服施力机构的影响,找出了提高跟踪性能的关键因素——多余力和稳态误差。通过采用结构不变性原理及PID控制来实现力的逐点跟踪。仿真结果表明,利用三段式跟踪力模型,并且采用前馈校正策略加PID控制,可实现动态模拟,并且有效地减小多余力,控制稳态误差,达到力跟踪精度性能的要求,为构建操纵负荷系统原理样机提供了数据参数和控制策略的依据。

Research on Simulation and Mathematic Modeling of Control Loading System of Flight Simulator

This paper presented to build mathematical models of control loading subsystem of flight simulator,and brought forward,three steps tracking force model for accommodatings for the re- quirements of the varying control stick force characteristics in different simulated objects and in differ- ent working modes.At the same time it was analysized that the positional disturbance made by pilot manipulating was the influence on the electrical hydraulic servo control loading subsystem,and key factors which were extraneous force and steady-state errors were found out to develop tracking capa- bility.The structural invariability principle and PID control were adopted to carry out force tracking from this point to another.The results of simulation indicate that dynamic simulation is realized by u- sing three steps tracking force model,and that the extraneous force and steady-state error are re- duced by adapting feedforward revising and PID control method.It caters for the requirement of force tracking precision performance and provides the support of data parameters and controlling strategy for constructing the principle sample machine of the control loading subsystem of flight simulator.