直线负载模拟器及其新型CMAC改进算法控制

Linear Loading Simulator Control Based on Novel CMAC Improved Algorithm

为检测某型直线阀是否能够达到姿/轨控发动机的推力要求,基于旋转电机加滚珠丝杠的方式,设计了一种直线负载模拟器(LLS)。为抑制多余力,提出一种基于电流环、位置环及力环的多闭环复合控制策略,并在力外环采用一种基于二维非均匀量化的新型CMAC改进算法,引入量化距离来确定高斯权重,并提出一种能够抑制"过学习"现象的新型权重学习方法。仿真及实验结果表明,该方法能够有效地抑制电动直线阀输出位移所带来多余力的干扰,明显地抑制了传统CMAC过学习现象,提高了LLS加载精度。

To test whether a linear valve can achieve the thrust requirement of the attitude/orbit control engine,the linear load simulator（LLS） was designed based on rotating motor and ball screw.To suppress the disturbance of surplus force,a hybrid control strategy with current loop,position loop and force loop is proposed.A novel CMAC improved algorithm based on two-dimensional nonuniform quantization is applied to the outer loop of force.The quantization distance is used to determine Gauss weights,and the learning method of CMAC weights is improved.The results show that this method can effectively suppress the disturbance of surplus force caused by electric valve linear＇s output displacement.And this method obviously restrain the over-learning phenomenon of traditional CMAC and improve the loading accuracy of LLS.