modelTwoWayPolynomial

Two way valve with polynomial characteristic

Extends from AixLib.Fluid.Actuators.BaseClasses.PartialTwoWayValveKv.

Information

Two way valve with polynomial opening characteristic. The polynomial coefficients are defined using parameter c. The elements of c are coefficients for increasing powers of y, starting with the power 0, which corresponds to a fixed offset. This valve model can be used to implement valves with a custom opening characteristic, such as a combination of a linear and an equal percentage characteristic.

This model is based on the partial valve model AixLib.Fluid.Actuators.BaseClasses.PartialTwoWayValve. Check this model for more information, such as the regularization near the origin.

Parameters

TypeNameDefaultDescription
RealcPolynomial coefficients, starting with fixed offset

Revisions

  • June 10, 2021, by Michael Wetter:
    Changed implementation of the filter and changed the parameter order to a constant as most users need not change this value.
    This is for #1498.
  • August 7, 2020, by Ettore Zanetti:
    changed the computation of phi using max(0.1*l, . ) to avoid phi=0. See issue 1376.
  • November 9, 2019, by Filip Jorissen:
    Guarded the computation of phi using max(0, . ) to avoid negative phi. See issue 1223.
  • September 30, 2017 by Filip Jorissen:
    First implementation.