OpenModelica error: an array of expandable connectors - over-determined system

Question

任何人都可以启发我为什么以下 modelica 代码在 OpenModelica 1.12.0 上生成错误？如果我删除最后两个连接方程，它工作正常。

class A
  Conn cc[3];
  Real a(start=0,fixed=true);
  Real b(start=0,fixed=true);
  Real c(start=0,fixed=true);
equation
  der(a) = 1;
  der(b) = 2;
  der(c) = 3;
  connect(a,cc[1].v);
  connect(b,cc[2].v); // Remove this to make it work
  connect(c,cc[3].v); // Remove this to make it work
end A;

可扩展连接器 cc 为空：

expandable connector Conn
end Conn;

以上代码在 OpenModelica 1.12.0 上产生错误：

[1] 15:07:44 Symbolic Error
Too many equations, over-determined system. The model has 6 equation(s) and 4 variable(s).

[2] 15:07:44 Symbolic Warning
[A: 11:3-11:21]: Equation 5 (size: 1) b = cc[2].v is not big enough to solve for enough variables.
  Remaining unsolved variables are: 
  Already solved: b
  Equations used to solve those variables:
    Equation 2 (size: 1): der(b) = 2.0

[3] 15:07:44 Symbolic Warning
[A: 12:3-12:21]: Equation 6 (size: 1) c = cc[3].v is not big enough to solve for enough variables.
  Remaining unsolved variables are: 
  Already solved: c
  Equations used to solve those variables:
    Equation 3 (size: 1): der(c) = 3.0

基本上，我想要一个可扩展连接器数组，我可以根据需要添加不同类型的变量。

编辑 18/08/2018

关于我只能将 "connectors" 连接到可扩展连接器，实际上我看到 modelica 规范 3.4 文档说：

All components in an expandable connector are seen as connector instances even if they are not declared as 
such [i.e. it is possible to connect to e.g. a Real variable].

看来我可以将 Real 变量连接到 OpenModelica 中的可扩展连接器，但是，我在 JModelica 中遇到错误：

Error at line 13, column 11, in file 'A.mo':
  Connecting to an instance of a non-connector type is not allowed

我也可以在 OpenModeica 中将 Real 变量连接到普通（不可扩展的）连接器，但这在 JModelica 中也是不允许的。所以工具以不同的方式解释语言规范！

Answer 1

您不能将 Real 变量连接到可扩展连接器，它需要是连接器。但不知何故，这也不起作用，似乎是一个错误。以下是有效的（在 OM 和 Dymola 中测试）：

class Expandable
  expandable connector Conn
    Real v[3];
  end Conn;

  connector RealOutput = output Real "'output Real' as connector";

  Conn cc;
  RealOutput a(start=0,fixed=true);
  RealOutput b(start=0,fixed=true);
  RealOutput c(start=0,fixed=true);
equation 
  der(a) = 1;
  der(b) = 2;
  der(c) = 3;
  connect(a,cc.v[1]);
  connect(b,cc.v[2]);
  connect(c,cc.v[3]);
end Expandable;

OpenModelica error: an array of expandable connectors - over-determined system

OpenModelica error: an array of expandable connectors - over-determined system

modeling

modelica

openmodelica

编辑 18/08/2018