Model-free design in a dual-rate system using finite impulse response filter
by Takao Sato; Natsuki Kawaguchi
International Journal of Advanced Mechatronic Systems (IJAMECHS), Vol. 11, No. 1, 2024

Abstract: In model matching design, the controller is determined by minimising the matching error between the reference model and the actual control system. Virtual reference feedback tuning (VRFT), a data-driven approach, uses a pre-filter to compensate for matching errors between model-based and data-driven functions. Designing the pre-filter in the time domain rather than the frequency domain allows the controller to be designed without limiting the types of initial process inputs. Conventional time-domain-based VRFT is designed as a single-rate method that is uniform over the entire period. When certain periods are limited by hardware performance or other factors, performance can be improved by setting the unrestricted period independently of the restricted period. In this study, time-domain-based VRFT is extended to a dual-rate system where the sampling period of the process output and the holding period of the process input are different. The control performance of the proposed dual-rate system is superior to that of the conventional single-rate system because the process input can be updated more frequently than in the single-rate system, even when the sampling period is limited by sensor performance or computational load.

Online publication date: Mon, 25-Mar-2024

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