无法表示 openmodelica 上的变量

Question

我想用这些单位创建一个变量：((rad/s)/((N/m)^0.5))

我尝试了很多设置，但仍然不起作用。

这是我最后一次尝试：

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

我也尝试过：

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

Answer 1

单位定义中不支持平方根，因为您必须使用整数作为指数。

Modelica 规范在第19.1 章“单位表达式的语法”中定义：

 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.

^请注意，定义指数时还必须删除该字符。