AixLib.Fluid.BaseClasses.ActuatorFilter

# .AixLib.Fluid.BaseClasses.ActuatorFilter

Filter used for actuators of valves, dampers and movers

## Information

This block implements a filter that is used to approximate the actuators of valves, dampers and fans.

#### Implementation

The implementation is based on Modelica.Blocks.Continuous.CriticalDamping. It differs from that model in that the internal state of the filter `s` is transformed using `x = u_nominal*s`. It turns out that this transformation leads to smaller system of nonlinear equations if `u_nominal ≠ 0`, see IBPSA, #1498 for a discussion.

## Revisions

- July 22, 2021, by Michael Wetter:
  First implementation for IBPSA, #1498

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