Concept
Rétroaction
Concepts associés (33)
Régulateur à boules
alt=|vignette|421x421px|Régulateur à boules vignette Le régulateur à boules de James Watt est un système permettant de réguler la vitesse de rotation d'une machine à vapeur. Il trouve son origine dans le volant d'inertie, équipant les systèmes bielle-manivelle, et qui permet de réguler la vitesse et d'éviter les blocages liés à l'existence de deux points morts.
Root locus analysis
In control theory and stability theory, root locus analysis is a graphical method for examining how the roots of a system change with variation of a certain system parameter, commonly a gain within a feedback system. This is a technique used as a stability criterion in the field of classical control theory developed by Walter R. Evans which can determine stability of the system. The root locus plots the poles of the closed loop transfer function in the complex s-plane as a function of a gain parameter (see pole–zero plot).
Parasitic oscillation
Parasitic oscillation is an undesirable electronic oscillation (cyclic variation in output voltage or current) in an electronic or digital device. It is often caused by feedback in an amplifying device. The problem occurs notably in RF, audio, and other electronic amplifiers as well as in digital signal processing. It is one of the fundamental issues addressed by control theory. Parasitic oscillation is undesirable for several reasons. The oscillations may be coupled into other circuits or radiate as radio waves, causing electromagnetic interference (EMI) to other devices.