I have created a trivial model of a pendulum in Modelica. After that, I have built the model so that the .xml file and the .exe file were generated.
model TestJAVA_v2
inner Modelica.Mechanics.MultiBody.World world annotation(
Placement(visible = true, transformation(origin = {-86, 28}, extent = {{-10,
-10}, {10, 10}}, rotation = 0)));
Modelica.Mechanics.MultiBody.Joints.Revolute revolute1(n = {1, 0, 0},
phi(fixed = true, start = 0.785398)) annotation(
Placement(visible = true, transformation(origin = {-46, 28}, extent =
{{-10,
-10}, {10, 10}}, rotation = 0)));
Modelica.Mechanics.MultiBody.Parts.PointMass pointMass1 annotation(
Placement(visible = true, transformation(origin = {16, 28}, extent = {{-10,
-10}, {10, 10}}, rotation = 0)));
Modelica.Mechanics.MultiBody.Parts.BodyShape bodyShape1(r = {0, 1, 1}, r_CM
= bodyShape1.r / 2) annotation(
Placement(visible = true, transformation(origin = {-14, 26}, extent =
{{-10,
-10}, {10, 10}}, rotation = 0)));
equation
connect(bodyShape1.frame_b, pointMass1.frame_a) annotation(
Line(points = {{-4, 26}, {16, 26}, {16, 28}, {16, 28}}, color = {95, 95,
95}));
connect(revolute1.frame_b, bodyShape1.frame_a) annotation(
Line(points = {{-36, 28}, {-24, 28}, {-24, 26}, {-24, 26}}, color = {95, 95,
95}));
connect(world.frame_b, revolute1.frame_a) annotation(
Line(points = {{-76, 28}, {-58, 28}, {-58, 28}, {-56, 28}}, color = {95, 95,
95}));
annotation(
uses(Modelica(version = "3.2.2")),
experiment(StartTime = 0, StopTime = 15, Tolerance = 0.001, Interval =
0.0010002),
__OpenModelica_simulationFlags(iim = "none", lv = "LOG_STATS", s =
"dassl"));
end TestJAVA_v2;
Using an xml parser I am able to change the mass of the BodyShape and the vector r (Vector from frame_a to frame_b resolved in frame_a). But after simulating, I found out that only the mass has changed, while the length of the component did not. Is it possible to modify this vector through the xml file ?
Some parameters cannot be changed without recompiling the model.
Search in the ScalarVariable for isValueChangeable attribute.
If isValueChangeable = "false" then you cannot change that value via the xml file.
This can happen because:
annotation(Evaluate=true) which basically makes it a constantMore information on edit, after some more analysis:
bodyShape1.r so it makes it a constant that cannot be changedomc -d=newInst or set in OMEdit the OMC flags to -d=newInst to use the new front-end implementation that allows bodyShape1.r to be changeable.With -d=newInst you get:
<ScalarVariable
name = "bodyShape1.r[1]"
valueReference = "1711"
description = "Vector from frame_a to frame_b resolved in frame_a"
variability = "parameter" isDiscrete = "true"
causality = "internal" isValueChangeable = "true"
alias = "noAlias"
classIndex = "86" classType = "rPar"
isProtected = "false" hideResult = "false"
fileName = "c:/home/adrpo33/dev/OpenModelica/build/lib/omlibrary/Modelica 3.2.2/Mechanics/MultiBody/Parts.mo" startLine = "1038" startColumn = "5" endLine = "1039" endColumn = "59" fileWritable = "true">
<Real start="0.0" fixed="true" useNominal="false" unit="m" />
</ScalarVariable>
which has isValueChangeable = "true".
adrpo33@computer MINGW64 /c/home/adrpo33/dev/OMTesting/mb
$ ./TestJAVA_v2.exe -override=bodyShape1.r[1]=2 -lv=LOG_ALL | grep 'bodyShape1.r\['
LOG_SOLVER | info | read override values: bodyShape1.r[1]=2
LOG_SOLVER | info | override bodyShape1.r[1] = 2
| | | | | Real bodyShape1.r[1](start=2, fixed=true, {nominal=1}, min=-1.79769e+308, max=1.79769e+308)
| | | | | Real bodyShape1.r[2](start=1, fixed=true, {nominal=1}, min=-1.79769e+308, max=1.79769e+308)
| | | | | Real bodyShape1.r[3](start=1, fixed=true, {nominal=1}, min=-1.79769e+308, max=1.79769e+308)
| | | | | | [87] parameter Real bodyShape1.r[1](start=2, fixed=true) = 2
| | | | | | [88] parameter Real bodyShape1.r[2](start=1, fixed=true) = 1
| | | | | | [89] parameter Real bodyShape1.r[3](start=1, fixed=true) = 1
Seems to be working fine with omc -d=newInst and Model -override