Aiming at the position servo system of NC machining tool, this paper designs a kind of control arithmetic on compound sliding variable structure for its controller.

针对数控机床的位置伺服系统，为其控制器设计了一种复合滑模变结构控制算法。

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Owing to the complicated variable rule of CMMs geometry error, it's difficult to convergence for using common BP neural network model arithmetic with a slow velocity.

由于坐标测量机几何误差变化规律复杂，采用一般的BP神经网络模型算法，速度慢且难以收敛。

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This paper traverses the BP arithmetic to solve non-linear system in one variable, presents and proves the convergence theorem of the arithmetic, shows the application example.

详细研究了一种一元非线性系统的BP算法，提出并证明了该算法的收敛性定理，给出了该算法的应用实例。

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