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Trying (and failing) to produce unit errors
Trying (and failing) to produce unit errors
Hello, I am new to both Modelica and OpenModelica. I am attempting to produce an error by using a unphysical equation, however when I run it it simulates fine and produces a result. The code I am using is shown below, adapted from Modelica by Example:
model RLC
parameter Modelica.SIunits.Voltage Vb = 24 "Battery voltage";
parameter Modelica.SIunits.Inductance L = 1;
parameter Modelica.SIunits.Resistance R = 100;
parameter Modelica.SIunits.Capacitance C = 0.001;
Modelica.SIunits.Voltage V;
Modelica.SIunits.Current i_L;
Modelica.SIunits.Current i_R;
Modelica.SIunits.Current i_C;
equation
i_R = V * R;
i_C = C * der(V);
i_L = i_R + i_C;
L * der(i_L) = Vb - V;
end RLC;
I have intentionally entered i_R = V * R rather than i_R = V / R, and no errors are produced. I am running OpenModelica 1.9.1+dev (r17983) (Bootstrapping version).
Thanks in advance.
Thank you
Re: Trying (and failing) to produce unit errors
Yes, OpenModelica does not perform unit checking by default (and does not have a reliable unit checker anyway).
Code:
omc RLC.mo Modelica -s --preOptModules+=unitChecking
...
Warning: The following equation is INCONSISTENT due to specified unit information: i_R = V * R
The units of following sub-expressions need to be equal:
- sub-expression "V * R" has unit "Mm4.s-6.A-3.g2"
- sub-expression "i_R" has unit "A"
- sjoelund.se
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