AixLib.Fluid.Actuators.BaseClasses.der_equalPercentage

# .AixLib.Fluid.Actuators.BaseClasses.der_equalPercentage

Derivative of valve opening characteristics for equal percentage valve

## Information

This function computes the derivative of the opening characteristics of an equal percentage valve.

The function is the derivative of AixLib.Fluid.Actuators.BaseClasses.equalPercentage.

#### Interface

>     function der_equalPercentage
>       extends Modelica.Icons.Function;
>       input Real y "Valve opening signal, y=1 is fully open";
>       input Real R "Rangeability, R=50...100 typically";
>       input Real l(min = 0, max = 1) "Valve leakage, l=Kv(y=0)/Kv(y=1)";
>       input Real delta "Range of significant deviation from equal percentage law";
>       input Real der_y "Derivative of valve opening signal";
>       output Real der_phi "Derivative of ratio actual to nominal mass flow rate, dphi/dy";
>     end der_equalPercentage;

## Revisions

- March 30, 2011 by Michael Wetter:
  Removed inputs for which no derivative is implemented from the argument list, and added `zeroDerivative` keyword in function that calls this function.
- February 4, 2010 by Michael Wetter:
  Fixed implementation of derivative function.
- June 6, 2008 by Michael Wetter:
  First implementation.

Generated at 2026-05-09T18:18:56Z by OpenModelicaOpenModelica 1.26.7 using GenerateDoc.mos