There is a typo in the description of the parameter p_init of PartialFluidComponent.
I think the description of p_init should be corrected to "Atmosperic Pressure".

Thanks for providing a useful library.

within OpenHydraulics.Interfaces;
partial model PartialFluidComponent
"Base model for any component involving fluid"

outer OpenHydraulics.Fluids.BaseClasses.PartialFluid oil
"This model must be defined in each circuit; the type must be a subtype of PartialFluid";

parameter SI.AbsolutePressure p_init = environment.p_ambient
"Initial temperature of the component" annotation (Dialog(tab="Initialization",group="Fluid"));

protected
outer OpenHydraulics.Circuits.Environment environment;

end PartialFluidComponent;

I've come across several cases where "deep modifications" are used. An example would be this fragment from OpenHydraulics.Circuits.PressureCompensated:

OpenHydraulics.Components.Valves.DirectionalValves.V4_3CC v4_3CC(
  portA(p(start=101325, fixed=true)),
  portB(p(start=101325, fixed=false)),
  portP(p(start=101325)),
  P2A(table=[0,0; 1,1]),
  B2T(table=[0,0; 1,1]),
  P2B(table=[-1,1; 0,0; 1,0]),
  A2T(table=[-1,1; 0,0]));

A better approach would be to "propagate" the parameters like portA.p.start and P2A.table up one level. This has two advantages. First, it adds those parameters to the dialog for V4_3CC (and potentially others, depending on where in the inheritance tree they the parameters are introduced) and it avoids having to remember how to make these deep modifications each time you create a new instance of V4_3CC. Otherwise, users have to do something like "Show Component" in Dymola and explore the whole hierarchy for these important parameters.

Ideally, the above code should really look like:

OpenHydraulics.Components.Valves.DirectionalValves.V4_3CC v4_3CC(
  p_A=101325, p_A_fixed=true,
  p_B=101325, p_B_fixed=false,
  p_P=101325,
  P2A_table=[0,0; 1,1],
  B2T_table=[0,0; 1,1],
  P2B_table=[-1,1; 0,0; 1,0],
  A2T_table=[-1,1; 0,0]);

Of course, these should be organized into tabs and groups.

Hello,

I'm a brand new Modelica user. I'm trying to learn the language with OpenModelica. I'd like to use OpenHydraulics in OpenModelica (specifically in the OMEdit Connection Editor). I downloaded version 1.0.1 of OpenHydraulics and installed it in "~OpenModelica1.0.0\lib\omlibrary\OpenHydraulics 1.0.1". I added this library in the OMEdit library list. After relaunching OMEdit I do see the OpenHydraulics library and am able to browse the library, however, when I open the Excavator example and try to Instantiate or Simulate the model I get many errors of the form:

"Base class Modelica.Icons.ExamplesPackage not found in scope OpenHydraulics.Examples"

I "installed" OpenHydraulics from the .zip that I downloaded from GITHUB. I had to modify the folder name and pull the code up one folder level to get OMEdit to recognize it and allow me to browse it (meaning from "~OpenModelica1.0.0\lib\omlibrary\OpenHydraulics 1.0.1\OpenHydraulics" to "~OpenModelica1.0.0\lib\omlibrary\OpenHydraulics 1.0.1"). However, with the above errors it seems that I've not installed this correctly.

Are there some simple instructions to properly install OpenHydraulics in OpenModelica such that I can run the Excavator example in the OMEdit Connection Editor tool?

Thanks in advance.

Hello,

I'm completely new in modelica and I crossed along this librar that I think it's very useful for what I need to do. I was just wondering if there's a publication where I can find deeper information about the library (article, book, blog).

Thank you very much for your help.
Edwin Avila

Hello,

I just started using Modelica and OpenHydraulics and have the following Problems:

• lots of the examples (Folder circuits) don't work. It seems that there are more variables than equations
• I can't connect junction components (neither graphically nor by adding the code manually)
• using the circuitTank always leads to a error message like "V_actual < V_max"

Does an "Manual" (which describes the equations used and how to use the components) for this library exist?

I apologise for my bad English. Thank you very much
Regards, Jan

Hello,

I'm a brand new Modelica user. I'm trying to learn the language with OpenModelica. I'd like to use OpenHydraulics in OpenModelica (specifically in the OMEdit Connection Editor).

I downloaded OpenModelica v1.19.2 and Modelica Standard Lib v3.2 to browse and run the library OpenHydraulics v1.0.1. However, when I open the Excavator example and try to Instantiate or Simulate the model I get many errors of the form:

[OpenHydraulics.Basic.VariableRestriction: 51:3-54:64]: Function ReynoldsNumber_m_flow not found in scope VariableRestriction.

Could you help me with this problem?
Thanks in advance.