Generalized hold devices for digital-to-analog conversion in electronically controlled systems

Supervised by:
  1. Koldobika Basterrechea Oyarzabal Director
  2. Rafael Bárcena Ruiz Director

Defence university: Universidad del País Vasco - Euskal Herriko Unibertsitatea

Fecha de defensa: 28 April 2014

  1. Víctor Etxebarria Ecenarro Chair
  2. Josu Jugo García Secretary
  3. Asier Ibeas Hernández Committee member
  4. José Julián Rodellar Benedé Committee member
  5. Carlos Francisco Alastruey Merino Committee member
  1. Tecnología Electrónica

Type: Thesis

Teseo: 116656 DIALNET


> This thesis deals with hold devices other than the zero-order hold > (ZOH), and therefore belongs to the field of sampled-data control > systems. It proposes a new application field for the fractional-order > hold (FROH) and a new design of generalized sampled-data hold function > (GSHF). Plant dynamics are assumed to be linear, time-invariant and > scalar (single-input, single-output).>> Specifically, we propose to use the FROH not to improve the system > output performance, but the system input performance as measured by > the reduction of the integral of the square of the transient control > signal (ISU). When used together with lightly damped resonant systems, > software-based simulations show ISU reductions of over 50% in step > responses, with barely affecting the system output performance; see > [1]. We also present a new design of GSHF that merges the advantages > of the FROH (ZOH output under constant input) with those of > conventional GSHFs (as many free parameters as desired), which makes > it possible to arbitrarily place z-domain zeros (like conventional> GSHFs) while avoiding intersample ripple under constant input (like > the FROH); see [2].>> Finally we provide experimental, hardware-based evidence obtained on a > small-scale positioning servomechanism. For the FROH application, the > reductions in true energy consumption turn out to be comparable to the > reductions in ISU anticipated. For the GSHF design we have seen no > issue that would prevent its use beyond academic environments, > particularly that the hold functionality can be easily accommodated in > controller idle time; see [3].>> [1]> [2]> [3]