Application of a time-delay pre-filter design for periodic signal tracking of lightly-damped multivariable systems

The aim of this work is the illustration of time-delay filter applications for three current industrial high-performance motion control problems. The main focus is on time-delay filters that enable zero phase tracking of periodic signals, however this is not a restriction for the introduced approaches. The first problem introduced in this paper is the point-of-interest or inferential control problem where the feedback variable typically is not the same as the performance variable. The second illustration is an application of time-delay filter design on a multivariable robotic system. The third challenge illustrates how a robust time-delay filter design allows for practical implementations on medical X-ray systems.