The virtual reference feedback tuning (VRFT) is a data-based method for the design of feedback controllers. In the original formulation, the VRFT method gives a solution to the degree of freedom model-reference control problem in which the objective is to shape the input-output transfer function of the control system. In this paper, the extension of the method to the design of 2 d.o.f. controllers is presented and discussed. Copyright (C) 2002 John Wiley Sons, Ltd.
Lecchini, A., Campi, M., & Savaresi, S. (2002). Virtual reference feedback tuning for two degree of freedom controllers. International Journal of Adaptive Control and Signal Processing, 16(5), 355-371. https://doi.org/10.1002/acs.711 (Original work published 2002)