Abstract
In this report, real-time inverse transfer function method is proposed to achieve rapid and precise positioning of an NC table. The transfer function is assumed as the second-order lag system. The parameters of dynamic characteristics are identified in real-time, considering change of the parameters, by piecewise linearization. Nonlinear characteristics are contained in the parameters in this operation. The compensated input calculated by the identified parameters is fed into the NC driver in real-time. Experimental control results showed the considerable improvement of trajectory accuracy over 37% compared with the conventional method results.
