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Improved describing function for hysteresis

Improved describing function for hysteresis

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A new and more accurate approximation for the describing function for hysteresis with saturation is described. This is based on a set of parallelograms with flat tops and gives rise to a single point on the Nyquist diagram which then becomes the stability bound.

References

    1. 1)
      • G.J. Thaler , M.P. Pastel . (1962) , Analysis and design of non-linear feedback control systems.
    2. 2)
      • A. Gelb , A. Vander , W. Velde . (1968) , Multiple-input describing functions and non-linear system design.
    3. 3)
      • Neal, C.B., Bunn, D.B.: `Describing function for hysteresis', Presented at the 5th joint automatic control conference, 1964, USA.
http://iet.metastore.ingenta.com/content/journals/10.1049/el_19750108
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