Can't represent a variable on openmodelica

Question

I want to create a variable with these unit: ((rad/s)/((N/m)^0.5))

I've tried many settings but it still doesn't work.

That's my last try:

  Real Cap_fact (quantity = "CapacityFactor", unit = "((rad/s)/((N/m)^0.5))");

I've tried also with:

  Real Cap_fact (final unit = ((rad/s)/((N/m)^0.5)));

https://github.com/modelica/ModelicaSpecification/issues/376 — matth, Oct 07 '21 at 14:51
possible duplicate of https://stackoverflow.com/questions/46491466/modelica-units-of-measurement-with-square-root — matth, Oct 07 '21 at 14:51
similar question, with an idea for a solution: https://ucum.org/trac/ticket/51 — matth, Oct 07 '21 at 14:52

marco · Answer 1 · 2021-10-06T15:35:54.683

Square roots are not supported in unit definitions, since you must use integers as exponents.

The Modelica Specifications defines in chapter 19.1 The Syntax of Unit Expressions:

 unit_factor:
  unit_operand [ unit_exponent ] 

 unit_exponent:
   [ "+" | "-" ] integer

The SI standard uses super-script for the exponentation, and does thus 
not define any operator symbol for exponentiation. A unit_factor 
consists of a unit_operand possibly suffixed by a possibly signed 
integer number, which is interpreted as an exponent.

Note that you also have to remove the character ^ when you define an exponent.

Can't represent a variable on openmodelica

1 Answers1