.AixLib.ThermalZones.ReducedOrder.Validation.VDI6007.BaseClasses.VerifyDifferenceThreePeriods

Information

Block that outputs satisfied = false if abs(u1-u2) > threShold within the prescribed time intervals, or satisfied = true otherwise.

Implementation

The test uses a hysteresis of plus/minus 1% in order to avoid chattering if abs(u1-u2) is near threShold.

The difference abs(u1-u2) is filtered with a first order filter with time constant tau. This guards against rounding errors in event handling by upstream signal-generating blocks.

Revisions

• November 4, 2021, by Michael Wetter:
  Added filtering to guard against rounding errors in events of upstream signal generating blocks.
  This is for Buildings, #2713.
• September 7, 2018, by Michael Wetter:
  Rewrote inequality to turn a state into a time event for Dymola 2019FD01.
• December 16, 2016, by Michael Wetter:
  Reformulated model for https://github.com/ibpsa/modelica-ibpsa/issues/623.
• October 10, 2013, by Michael Wetter:
  Reformulated model to allow scheduling of time events as opposed to state events, and removed noEvent operator which is not needed as these are only time events.
• June 29, 2016, by Moritz Lauster:
  First implementation.