什么是系统工程（字幕）39

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那这个参数图画在哪里呢

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画在

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你看它

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这里有个block叫初始蒸馏器分析

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是针对这个block来画参数图

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那这个放哪里

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那前面有一个包嘛，就是

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这个对吧

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工程分析这个，我们给它添加一个包就是了

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就叫

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初始

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蒸馏器分析

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然后创建一个

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块定义图，也叫这个名字吧

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因为这些书上没有

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我们就猜测是这样做的

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好

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然后到块定义图，把这个框

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搞一下

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然后放成一个block

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叫什么

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就叫初始蒸馏器分析

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这个block

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因为我们要对它画参数图嘛

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然后右边这边

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约束是什么

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约束实际上也是block

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对不对

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所以呢，在哪里定义

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也是在那个

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块定义图上放置就行了

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那我们看这个约束的名字

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名字是什么

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右边这个才是

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这个是它名字

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这是它

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拖到

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参数图上引用的时候

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那个实例的名字

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是右边

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这个是名字

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单相热传输方程

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这是名字

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包括下面相变热传输方程，这是名字

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那我们现在建立一个约束块

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你看

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这个

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放上来

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名字叫什么

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单相

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热传输

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方程

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然后看它的公式

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qrate等于这个这个这个

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公式就写这里

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qrate

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等于

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括号，th-tc

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括号

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然后是

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乘以

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质量流率mrate，乘以比热，对吧

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乘以

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再乘以比热

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在敲的过程中

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它就会上面出现各种参数

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它就识别出来了

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对吧

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然后类型实数

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这个应该问题不大

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我们照着做就行了

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就这个

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好

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close 

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它问要不要创建，创建就行了

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得到一个单相热传输方程

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那么这里我们注意，这个类型实数

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一会我们拖上去的时候

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会发现那个约束块

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它跟我们这个书上的图不太一样

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那要改变怎么办

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那就把这个类型变成那个值类型

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那这个我们一会再看

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包括刚才讲的

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为什么说那个是泛化关系

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因为这里类型是实数

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你绑定过来

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那你那边也是实数类型

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如果这边要

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不用

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这个

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不让它这样泛化过来

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而是组合一个的话

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那么这边类型就得变了

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那这个是

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一个比较

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麻烦的问题

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好

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这是一个约束了

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我们再看另外一个约束叫什么

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另外一个约束叫做

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相变热传输方程

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相变

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热传输方程

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它的公式是

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qrate乘以mrate乘以

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潜热

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对的

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好

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我们得到了两个

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方程了

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那这两个方程跟

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这个初始蒸馏器分析呢，可以看作是一个组合关系

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它组合了这两个方程

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作为它约束的属性

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因为本来这两个是可以写在这里面的嘛

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对吧

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这公式可以写在这里面

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可以写在这里面的

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这个约束这里嘛

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对吧

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可以写在这里的

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但是我们现在为了复用它

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就不写在这里

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那既然把它分离出来

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它跟原来的主人的关系

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就可以看作是一个什么

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组合关系

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画过来

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所以你看，组合过来

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这里就有一个约束属性的类型

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这个也是

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这样

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好

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这是块定义图上的

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我们定义了一个块，两个约束

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对吧

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那接下来我们来建立这个参数图了

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怎么建

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右键点这个

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new

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参数图这里

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名字叫什么来着

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恒压热分析

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恒压热分析

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这个

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那我们对照一下

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par，block

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初始蒸馏器分析

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恒压热分析

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对吧

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好

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那我们来把这个放大一点

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那首先把约束拖上去

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变成一个实例

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然后实例名字叫加热给水

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我们拖上去，约束在哪里呀

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这是哪一个

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单相热传输是吧

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单相热传输这个拖上来

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拉大点

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再大一点

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搞小一点

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公式

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这样

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好

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单相热传输工程

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然后这个名字我们叫

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加热

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给水

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这样来

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我们对照一下

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这个有了，有了

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一共五个

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对吧

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五个有了

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这样

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但是这不一样的是

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你看这里就是单位

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什么

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你看这里

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这里是

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这参数是质量流率，单位什么之类

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我们这个是实数

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这个的话我也不知道怎么改

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另外一个改法

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一会我们再演示

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我们现在先

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改法就是直接把这个参数改成那个值类型

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00:08:56,429 --> 00:08:56,630

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这我就不知道了

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我查了EA上的各种演示

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它也是一个个出来

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也是一个一个的实数什么之类的

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没有像这个单位这样出来

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这个怎么做到

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这个就不知道了

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好

210
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那我们再搞下一个

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这是相变热传输方程，冷凝

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一样的

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拖上来

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这是冷凝

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用来演算，或者说

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模拟冷凝的那些数据的演算

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煮沸，也同样是相变热传输方程

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00:09:51,770 --> 00:09:52,007

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一样大

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这叫煮沸

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对吧，三个

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好

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往这边挪一点

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然后看左边这边了

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这边是一个一个的属性

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那刚才我们说省事的方法是什么

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你就直接敲字了

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对吧

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00:10:35,359 --> 00:10:35,604

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直接敲字，这里

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放一个property

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名字叫什么

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叫做

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中文，初始蒸馏器

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·

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main1

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·

241
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质量流率

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然后冒号是

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gm

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00:11:27,740 --> 00:11:28,840

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second 

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00:11:46,550 --> 00:11:46,755

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显然这是拼凑了

248
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因为它背后概念没建立起来

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那肯定不行的

250
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但是我们演示

251
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比如说，你要画出这个

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00:11:57,051 --> 00:12:00,552
它是绑定这个质量流率嘛，这里嘛

253
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对吧

254
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那我们把它绑定过来

255
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然后它就问没有指定类型要不要****

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00:12:11,910 --> 00:12:12,578

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不管它了

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00:12:14,770 --> 00:12:15,030

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这样

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这是一个

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做法，长得比较像的

262
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如果要长得比较像，是这样

263
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那如果长得不太像

264
00:12:25,153 --> 00:12:28,240
但是比较严谨的做法是什么样的

265
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那我们

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还是要用这个比较严谨的做法来演示

267
00:12:34,133 --> 00:12:36,583
如果你只是要模仿这个的话

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这样就行了

269
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你一个一个这样加上去，对吧

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一个一个这样加上去

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然后绑定到这边就行了

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那我们看严谨的

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但是长得跟这个不太像的

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但在EA里面能做到的，应该什么样子

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那我们来看怎么做

原文地址：https://blog.csdn.net/rolt/article/details/136365138

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