Open AccessOn the Stability of Digital Position Control with Viscous Damping and Coulomb Friction
Author(s) -
Csaba Budai,
László Kovâcs
Publication year - 2017
Publication title -
periodica polytechnica. mechanical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.259
H-Index - 16
eISSN - 1587-379X
pISSN - 0324-6051
DOI - 10.3311/ppme.10537
Subject(s) - viscous damping , coulomb , dissipation , instability , vibration , dry friction , control theory (sociology) , stability (learning theory) , position (finance) , mechanics , physics , coulomb friction , envelope (radar) , classical mechanics , materials science , computer science , control (management) , nonlinear system , acoustics , thermodynamics , telecommunications , radar , finance , composite material , quantum mechanics , artificial intelligence , machine learning , economics , electron
In this paper, we investigate the combined effect of viscous damping and Coulomb friction on sampled-data mechanical systems. In these systems, instability can occur due the sampling of the applied discrete-time controller which is compensated by the two different physical dissipation effects. In order to investigate the interplay between these, we focus on how the stable domain of operation is extended by the dry friction compared to viscous damping. We also show that dry friction causes concave envelope vibrations in this extended region. The analytical results, presented in the form of stability charts, are verified by a detailed set of simulations at different representative control parameter values.