Abstract
A new real–time inverse transfer function method is proposed to achieve rapid and precise positioning of an NC table. The calculated transfer functions during motion are assumed as the second–order lag system. The parameters of dynamic characteristics are identified in real–time, considering changes of the parameters by piecewise linearization of motion. Nonlinear characteristics are considered consequently in the parameters by this operation. The compensated input calculated by the identified parameters is fed into the NC driver in real–time. Experimental control results in case of circular interpolation motion are measured by linear scale to evaluate our proposed method. Experimental control results showed the considerable improvement of the trajectory accuracy.
