【发布时间】：2019-03-22 17:31:38
【问题描述】：
我继续致力于了解如何在库和应用程序中最好地划分代码。在之前的几篇文章中，我使用了一个带有应用程序 dxx_app7 的玩具示例 DEMO_xx 库。下面是一个稍微更新的版本来涵盖这里的问题。我已经加入了在收获罐中添加传感器的可能性。
现在我想了解如何在应用程序代码中从应用程序 Medium7 中引入从库 Medium2 扩展而来的信息，并在应用程序的新组件模型中完全使用这些信息。
我的理解是，如果您导入从另一个包扩展的包，您只会得到“最新”包，而不是通过扩展构建的包以及汇总的 Medium7 信息。
示例中通过将常量 SensorX.component 从有效的 C 更改为无效的 A 或 B 来说明这一事实。
但是，如果我创建了 Medium7 的本地实例，那么我将获得 Medium7 的完整信息。我可以在 SensorX 中做到这一点，标记为 Question 1 - alt 2。 我也可以选择这种基板来衡量系统配置并标记问题 1 alt 3。我认为这是更具可读性的代码。
但是如何使 Medium7 的所有内容在本地可用？我必须为我需要的每个常量在本地定义一个新常量，正如我在这里使用 sensorX.component 展示的那样吗？通常你可能希望在一个模型中能够访问介质的各种属性，并且方便地放入包中
另外，我希望我可以导入适用于 Medium7 的连接器 LiquidCon，而不是在 Sensor7 包中再次编写该代码。按建议导入不起作用。还有其他方法吗？我只在 JModelica 2.4 中测试过代码，它可能是一个错误？
希望能就这两个问题提供一些意见。 / 简·彼得
在问题感兴趣的应用程序代码 d12_app7 下方，然后是相关的库 DEMO_v12。我已经用 cmets 对这两个问题的代码更改做了标记，就代码而言，它适用于问题 1 alt 1。
encapsulated package d12_app7
// ---------------------------------------------------------------------------------------------
// Interfaces
// ---------------------------------------------------------------------------------------------
import Modelica.Blocks.Interfaces.RealInput;
import Modelica.Blocks.Interfaces.RealOutput;
package Medium7
import M2 = DEMO_v12.Medium2;
extends M2
(name = "Seven components" "Medium name",
nc = 7 "Number of substances",
mw = cat(1,M2.mw,{30,40,50,60,70}) "Substance weight",
redeclare type Concentration = Real[nc] "Substance conc");
constant Integer C = 3 "Substance index";
constant Integer D = 4 "Substance index";
constant Integer E = 5 "Substance index";
constant Integer F = 6 "Substance index";
constant Integer G = 7 "Substance index";
end Medium7;
// ---------------------------------------------------------------------------------------------
// New sensor introduced in this application for measurement of substance A
// ---------------------------------------------------------------------------------------------
package Sensor7
connector LiquidCon
Medium7.Concentration c "Substance conc";
flow Real F (unit="m3/s") "Flow rate";
end LiquidCon;
model SensorX
// import d12_app7.Equipment7.LiquidCon; // Question 2
import d12_app7.Medium7.*; // Question 1 - alt 1
constant Integer component = C; // Question 1 - alt 1
// constant Integer component = d12_app7.Medium7.A; // Question 1 - alt 2
LiquidCon probe;
RealOutput out;
equation
probe.F = 0;
out = probe.c[component];
end SensorX;
end Sensor7;
// ---------------------------------------------------------------------------------------------
// Adaptation of library DEMO_v12 to Medium7
// ---------------------------------------------------------------------------------------------
package Equipment7
import DEMO_v12.Equipment;
extends Equipment(redeclare package Medium=Medium7);
end Equipment7;
// ---------------------------------------------------------------------------------------------
// Examples of systems
// ---------------------------------------------------------------------------------------------
import DEMO_v12.Control;
model Test
Equipment7.Medium medium; // Instance not necessary but helpful for user interface
Equipment7.PumpType pump;
Equipment7.FeedtankType feedtank;
Equipment7.HarvesttankType harvesttank;
Sensor7.SensorX sensor; // Question 1 alt 1 and 2
// Sensor7.SensorX sensor(component = medium.A); // Question 1 alt 3
Control.FixValueType Fsp(val=0.2);
equation
connect(feedtank.outlet, pump.inlet);
connect(pump.outlet, harvesttank.inlet);
connect(Fsp.out, pump.Fsp);
connect(sensor.probe, harvesttank.port);
end Test;
end d12_app7;
最后是库代码 DEMO_v12
package DEMO_v12
// ---------------------------------------------------------------------------------------------
// Interfaces
// ---------------------------------------------------------------------------------------------
import Modelica.Blocks.Interfaces.RealInput;
import Modelica.Blocks.Interfaces.RealOutput;
package Medium2
replaceable constant String name = "Two components" "Medium name";
replaceable constant Integer nc = 2 "Number of substances";
replaceable type Concentration = Real[nc] "Substance conc";
replaceable constant Real[nc] mw = {10, 20} "Substance weight";
constant Integer A = 1 "Substance index";
constant Integer B = 2 "Substance index";
end Medium2;
package Medium3
import M2 = DEMO_v12.Medium2;
extends M2
(name="Three components" "Medium name",
nc=3 "Number of substances",
mw = cat(1,M2.mw,{30}) "Substance weight",
redeclare type Concentration = Real[nc] "Substance conc");
constant Integer C = 3 "Substance index";
end Medium3;
// ---------------------------------------------------------------------------------------------
// Equipment dependent on the medium
// ---------------------------------------------------------------------------------------------
package Equipment
replaceable package Medium
end Medium;
connector LiquidCon
Medium.Concentration c "Substance conc";
flow Real F (unit="m3/s") "Flow rate";
end LiquidCon;
model PumpType
LiquidCon inlet, outlet;
RealInput Fsp;
equation
inlet.F = Fsp;
connect(outlet, inlet);
end PumpType;
model FeedtankType
LiquidCon outlet;
constant Integer medium_nc = size(outlet.c,1);
parameter Real[medium_nc] c_in (each unit="kg/m3")
= {1.0*k for k in 1:medium_nc} "Feed inlet conc";
parameter Real V_0 (unit="m3") = 100 "Initial feed volume";
Real V(start=V_0, fixed=true, unit="m3") "Feed volume";
equation
for i in 1:medium_nc loop
outlet.c[i] = c_in[i];
end for;
der(V) = outlet.F;
end FeedtankType;
model HarvesttankType
LiquidCon inlet, port;
constant Integer medium_nc = size(inlet.c,1);
parameter Real V_0 (unit="m3") = 1.0 "Initial harvest liquid volume";
parameter Real[medium_nc] m_0
(each unit="kg/m3") = zeros(medium_nc) "Initial substance mass";
Real[medium_nc] c "Substance conc";
Real[medium_nc] m
(start=m_0, each fixed=true) "Substance mass";
Real V(start=V_0, fixed=true, unit="m3") "Harvest liquid volume";
equation
for i in 1:medium_nc loop
der(m[i]) = inlet.c[i]*inlet.F;
c[i] = m[i]/V;
port.c[i] = c[i];
end for;
der(V) = inlet.F;
end HarvesttankType;
end Equipment;
// ---------------------------------------------------------------------------------------------
// Control
// ---------------------------------------------------------------------------------------------
package Control
block FixValueType
RealOutput out;
parameter Real val=0;
equation
out = val;
end FixValueType;
end Control;
// ---------------------------------------------------------------------------------------------
// Examples of systems
// ---------------------------------------------------------------------------------------------
// package Equipment3 = Equipment(redeclare package Medium=Medium3); // Just shorter version
package Equipment3
import DEMO_v12.Equipment;
extends Equipment(redeclare package Medium=Medium3);
end Equipment3;
model Test
Equipment3.Medium medium;
Equipment3.FeedtankType feedtank;
Equipment3.HarvesttankType harvesttank;
Equipment3.PumpType pump;
Control.FixValueType Fsp(val=0.2);
equation
connect(feedtank.outlet, pump.inlet);
connect(pump.outlet, harvesttank.inlet);
connect(Fsp.out, pump.Fsp);
end Test;
end DEMO_v12;
【问题讨论】：
-
我刚刚更正了 d12_app7 和 SensorX 模型。问题 2 中 LiquidCon 的导入语句现在是正确的。激活此替代方法后，代码仍然无法正常工作 - 所以问题 2 仍然存在！
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