This paper describes an indentometer device used to identify the linear dynamic and nonlinear properties of skin and underlying tissue using an in vivo test. The device uses a Lorentz force actuator to apply a dynamic force to the skin and measures the resulting displacement. It was found that the skin could be modeled as a Wiener system (i.e. a linear dynamic system followed by a static nonlin...

In this paper, the robustness of a typical control scheme for Wiener systems is studied. These systems consist of the cascade connection of a linear time invariant system and a static nonlinearity. To control this kind of systems, several approaches were discussed in the literature. Most of these control schemes involve transformation of the measured variable as well as the setpoint, by the inv...

The goal of this paper is to compute the generating series a closed-loop system when plant described in terms Chen-Fliess and static output feedback applied. first step reconsider so called Wiener-Fliess connection consisting followed by memoryless function. Of particular importance will be contractive nature map, which needed show that has representation. To explicitly series, two Hopf algebra...