Nyquist (stability) criterion

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• Nyquist stability criterion — The Nyquist plot for . When designing a feedback control system, it is generally necessary to determine whether the closed loop system will be stable. An example of a destabilizing feedback control system would be a car steering system that… …   Wikipedia

• Routh-Hurwitz stability criterion — The Routh Hurwitz stability criterion is a necessary (and frequently sufficient) method to establish the stability of a single input, single output (SISO), linear time invariant (LTI) control system. More generally, given a polynomial, some… …   Wikipedia

• Barkhausen stability criterion — The Barkhausen stability criterion was put forth by German physicist Heinrich Georg Barkhausen (1881 1956) for sustained oscillations and it states that: #The loop gain of the oscillator circuit must be greater than or equal to unity, that is,… …   Wikipedia

• Nyquist — is a surname of Swedish and Norwegian origin which may refer to: People Arild Nyquist (1937–2004), Norwegian novelist, lyricist, writer and musician Harry Nyquist (1889–1976), Swedish American engineer Kari Nyquist (born 1918), Norwegian ceramist …   Wikipedia

• Nyquist plot — A Nyquist plot. A Nyquist plot is a parametric plot of a transfer function used in automatic control and signal processing. The most common use of Nyquist plots is for assessing the stability of a system with feedback. In Cartesian coordinates,… …   Wikipedia

• Nyquist–Shannon sampling theorem — Fig.1: Hypothetical spectrum of a bandlimited signal as a function of frequency The Nyquist–Shannon sampling theorem, after Harry Nyquist and Claude Shannon, is a fundamental result in the field of information theory, in particular… …   Wikipedia

• Nyquist, Harry — ▪ American physicist born Feb. 7, 1889, Nilsby, Sweden died April 4, 1976, Harlingen, Texas, U.S.       American physicist and electrical and communications engineer, a prolific inventor who made fundamental theoretical and practical… …   Universalium

• Harry Nyquist — (1889 1976) Born February 7, 1889( …   Wikipedia

• Circle criterion — In nonlinear control, the circle criterion is an important theorem in showing the stability of nonlinear time varying systems. It can be viewed as a generalization of the Nyquist stability criterion for LTI systems. Overview Consider a linear… …   Wikipedia

• BIBO stability — Bibo redirects here. For the Egyptian football player nicknamed Bibo, see Mahmoud El Khateeb. In electrical engineering, specifically signal processing and control theory, BIBO stability is a form of stability for signals and systems.BIBO stands… …   Wikipedia

• Argument principle — In complex analysis, the Argument principle (or Cauchy s argument principle) states that if f ( z ) is a meromorphic function inside and on some closed contour C , with f having no zeros or poles on C , then the following formula holds: oint {C}… …   Wikipedia