This Modelica package is provided under the Modelica License 2 and no longer under Modelica License 1.1. There are the following reasons why the Modelica Association changes from Modelica License 1.1 to this new license text (note, the text below is not a legal interpretation of the Modelica License 2. In case of a conflict, the language of the license shall prevail):
The following new
components have been added to existing libraries:
Electrical.Analog.Basic. | |
M_Transformer | Transformer, with the possibility to choose the number of inductors. The inductances and the coupled inductances can be chosen arbitrarily. |
Electrical.Analog.Lines. | |
M_OLine | Segmented line model that enables the use of multiple lines, that means, the number of segments and the number of single lines can be chosen by the user. The model allows to investigate phenomena at multiple lines like mutual magnetic or capacitive influence. |
Mechanics.Translational.Components.Examples. | |
Brake | Demonstrates the usage of the translational brake component. |
Media.Interfaces.PartialMedium. | |
ThermoStates | Enumeration type for independent variables to identify the
independent variables of the medium (pT, ph, phX, pTX, dTX). An implementation of this enumeration is provided for every medium. (This is useful for fluid libraries that do not use the PartialMedium.BaseProperties model). |
setSmoothState | Function that returns the thermodynamic state which smoothly
approximates: if x > 0 then state_a else state_b. (This is useful for pressure drop components in fluid libraries where the upstream density and/or viscosity has to be computed and these properties should be smooth a zero mass flow rate) An implementation of this function is provided for every medium. |
Media.Common. | |
smoothStep | Approximation of a general step, such that the characteristic is continuous and differentiable. |
Media.UsersGuide. | |
Future | Short description of goals and changes of upcoming release of Modelica.Media. |
Media.Media.Air.MoistAir. | |
isentropicExponent | Implemented Missing Function from interface. |
isentropicEnthalpyApproximation | Implemented function that approximates the isentropic enthalpy change. This is only correct as long as there is no liquid in the stream. |
The following existing
components have been changed (in a backward compatible way):
Mechanics.Rotational.Interfaces. | |
PartialFriction | Improvement of friction model so that in certain situations the number of iterations is much smaller. |
Mechanics.Translational.Components.Examples. | |
Friction | Added a third variant, where friction is modelled with the SupportFriction component. |
Mechanics.Translational.Components. | |
MassWithStopAndFriction | Improvement of friction model so that in certain situations the number of iterations is much smaller. |
Mechanics.Translational.Interfaces. | |
PartialFriction | Improvement of friction model so that in certain situations the number of iterations is much smaller. |
Media.Examples. | |
SimpleLiquidWater IdealGasH20 WaterIF97 MixtureGases MoistAir |
Added equations to test the new setSmoothState(..) functions including the analytic derivatives of these functions. |
Media.Interfaces.PartialLinearFluid. | |
setState_pTX setState_phX setState_psX setState_dTX |
Rewritten function in one statement so that it is usually inlined. |
Media.Interfaces.PartialLinearFluid. | |
consistent use of reference_d instead of density(state | Change was done to achieve consistency with analytic inverse functions. |
Media.Air.MoistAir. | |
T_phX | Interval of nonlinear solver to compute T from p,h,X changed from 200..6000 to 240 ..400 K. |
The following critical
errors have been fixed (i.e., errors that can lead
to wrong simulation results):
Mechanics.MultiBody.Forces | |
WorldTorque | Parameter "ResolveInFrame" was not propagated and therefore always the default (resolved in world frame) was used, independently of the setting of this parameter. |
WorldForceAndTorque | Parameter "ResolveInFrame" was not propagated and therefore
always the default (resolved in world frame) was used,
independently of the setting of this parameter. Furthermore, internally WorldTorque was used instead of Internal.BasicWorldTorque and therefore the visualization of worldTorque was performed twice. |
Mechanics.MultiBody.Sensors | |
AbsoluteSensor | Velocity, acceleration and angular acceleration were computed by differentiating in the resolveInFrame frame. This has been corrected, by first transforming the vectors in to the world frame, differentiating here and then transforming into resolveInFrame. The parameter in the Advanced menu resolveInFrameAfterDifferentiation is then superfluous and was removed . |
AbsoluteVelocity | The velocity was computed by differentiating in the resolveInFrame frame. This has been corrected, by first transforming the velocity in to the world frame, differentiating here and then transforming into resolveInFrame |
RelativeSensor | If resolveInFrame <> frame_resolve and resolveInFrameAfterDifferentiation = frame_resolve, a translation error occurred, since frame_resolve was not enabled in this situation. This has been corrected. |
RelativeVelocity | The velocity has have been computed by differentiating in the resolveInFrame frame. This has been corrected, by first transforming the relative position in to frame_a, differentiating here and then transforming into resolveInFrame |
TransformRelativeVector | The transformation was wrong, since the parameters frame_r_in and frame_r_out have not been propagated to the submodel that performs the transformation. This has been corrected. |
Mechanics.Translational.Components. | |
SupportFriction Brake |
The sign of the friction force was wrong and therefore friction accelerated instead of decelerated. This was fixed. |
SupportFriction | The component was only correct for fixed support. This was corrected. |
Media.Interfaces. | |
PartialSimpleMedium PartialSimpleIdealGasMedium |
BaseProperties.p was not defined as preferred state and BaseProperties.T was always defined as preferred state. This has been fixed by Defining p,T as preferred state if parameter preferredMediumState = true. This error had the effect that mass m is selected as state instead of p and if default initialization is used then m=0 could give not the expected behavior. This means, simulation is not wrong but the numerics is not as good and if a model relies on default initial values, the result could be not as expected. |
The following uncritical
errors have been fixed (i.e., errors that do
not lead to wrong
simulation results, but, e.g., units are wrong or errors in
documentation):
Blocks.Math. | |
InverseBlockConstraint | Changed annotation preserveAspectRatio from true to false. |
Blocks.Sources. | |
RealExpression IntegerExpression BooleanExpression |
Changed annotation preserveAspectRatio from true to false. |
Electrical.Analog.Basic. | |
SaturatingInductor | Replaced non-standard "arctan" by "atan" function. |
Modelica.Electrical.Digital. | |
UsersGuide | Removed empty documentation placeholders and added the missing release comment for version 1.0.7 |
Modelica.Mechanics.Translational.Components. | |
MassWithStopAndFriction | Changed usage of reinit(..), in order that it appears only once for one variable according to the language specification (if a tool could simulate the model, there is no difference). |
Media.Interfaces.PartialSimpleMedium | |
pressure temperature density specificEnthalpy |
Missing functions added. |