In recent years, direct data-driven controller tuning methods have been proposed as an alternative to the standard modelbased approach for model-reference control design. In this work, the problem of input design for noniterative direct datadriven techniques, namely Virtual Reference Feedback Tuning (VRFT) and noniterative Correlation-based Tuning (CbT), is investigated. For bounded input energ...

2. Direct Adaptive Control of Scalar Plant. Let us begin with a simple scalar adaptive system, ẋp(t) = apxp(t) + kpu(t) (1) where xp(t) ∈ R is the plant state, u(t) ∈ R is the control input, ap ∈ R is an unknown scalar and only the sign of kp ∈ R is known. For the direct adaptive controller we choose a reference model as ẋm(t) = amxm(t) + kmr(t)− l(x(t)− xm(t)). (2) All of the parameter above a...

Traditional CyberKnife (CK) calibration uses TG-51, which requires kQ to be defined using the standard reference condition of 100 cm SSD in a 10 cm × 10 cm field. Since the CK is calibrated using a 6 cm fixed-aperture collimating cone at 80 cm SAD, the BJR-25 method is commonly used to relate circular-field PDDs to square-field PDDs for kQ determination. Using the InCise MLC system, the CK is a...

Abstract: Virtual Reference Feedback Tuning (VRFT) is a direct controller design methodology which can be applied both in the linear and nonlinear case. In this work, neural network controllers have been designed following nonlinear VRFT principles, conforming what could be considered a particular scheme of direct neural Model Reference Control. The approach has been applied to a simulated cran...

This paper presents the application of a direct Fractional Order Model Reference Adaptive Controller (FOMRAC) to an Automatic Voltage Regulator (AVR). A direct FOMRAC is a direct Model Reference Adaptive Control (MRAC), whose controller parameters are adjusted using fractional order differential equations. Four realizations of the FOMRAC were designed in this work, each one considering differen...

In this study, we propose a novel data-driven approach for control of two degrees freedom systems. The proposed method uses one-shot experimental data to derive the reference governor improving performance. consists feedback-feedforward controller, desired transfer function, and virtual feedforward controller. Virtual controller can be obtained using such as ERIT, FRIT, VRFT. Since model is not...