Modelica 中的 DrumBoiler 建模

问题描述

我想使用 modelica 进行建模，尤其是 thermial 和 fluid 分支.因此，现在我正在从 stackoverflow 和 modelica 库中逆向和更改示例，以更好地了解该语言.

目前我试图理解 Modelica.Fluid.Examples.DrumBoiler.DrumBoiler.我没有任何问题可以理解模型在物理上的作用.但是当我重建它时，我收到错误消息:

在作用域 DrumBoiler 中找不到函数 Cv.from_bar.

我从头开始重建模型，并从库中复制了示例.两者同样的问题.问题出在这里:

Modelica.Fluid.Sources.FixedBoundary sink(nPorts = 1,p = Cv.from_bar(0.5), <-- 问题重新声明包 Medium = Modelica.Media.Water.StandardWaterOnePhase，T = 500)

为了定义水槽的起始 (?) 压力，调用了一个函数.但是该函数没有在任何地方定义.然而，当我从库中模拟它时，该模型有效，但当我从那里复制它时却不起作用.

我错过了什么?我正在使用 OMedit.

解决方案

函数在这里:Modelica.SIunits.Conversions.from_bar.您可以使用 import 导入它，或使用 import Cv = Modelica.SIunits.Conversions 以较短的别名 Cv 导入它.>

您还可以在此处阅读有关导入的更多信息:

• https://mbe.modelica.university/components/packages/nimport
• https://mbe.modelica.university/components/packages/importing

I want to get into modeling with modelica especially the thermial and fluid branches. So now I am reversing and altering examples from stackoverflow and the modelica library to get to know the language better.

At the moment I try to understand Modelica.Fluid.Examples.DrumBoiler.DrumBoiler. I have no problems to comprehend what the model does physically. But when I rebuilt it, I get the error message:

I rebuild the model from scratch and I copied the example from the library. Both the same problem.The problem lies here:

Modelica.Fluid.Sources.FixedBoundary sink(
nPorts = 1, 
p = Cv.from_bar(0.5), <-- problem
redeclare package Medium = Modelica.Media.Water.StandardWaterOnePhase, 
T = 500)

In order to define the starting (?) pressure of the sink, a function is called. But the function was not defined anywhere. And yet the model works when I simulate it from the library, but it does not when I copy it from there.

What am I missing?I am using OMedit.

解决方案

The function is here: Modelica.SIunits.Conversions.from_bar. You can use import to import it, or import Cv = Modelica.SIunits.Conversions to import it under the shorter alias name Cv.

You can also read more about importing here:

• https://mbe.modelica.university/components/packages/nimport
• https://mbe.modelica.university/components/packages/importing

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