什么是系统工程（字幕）19

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接下来呢

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就轮到图16.10

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蒸馏器功能的初始分解

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那么这里它是用了一个block

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不

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那个BDD，块定义图

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来描述

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实际上就相当于，你看，上面的块

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是一个活动

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或者是功能

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实际上就是，把块定义图的那个

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组合关系当成功能分解来用了

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当然这个来说

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如果从面向对象的角度来看的话

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这个是比较怪的

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但这我们不管了

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那么SysML里面从1.5开始也有了这个，就是说

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activities as blocks 就是

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把活动当成block来使用

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那么它标准里是有这个的

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那这是包的名字

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然后，图的名字，功能分解，这样

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那下面我们来画一下

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把这个变回来

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变成

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图的，好

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然后呢

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首先我们有一个要调整

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就是

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之前

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我们

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说那个H2O，水，热

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这个的话，我们说是在项类型里面的

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我们

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失误了

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放在这里了

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在这里面建的

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我们把它拖回去

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这应该是项类型

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这个才对

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好

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那我们来画一下，画在哪里

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蒸馏器需求，蒸馏器规约这里

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这下面，对吧

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然后有一个初始行为这样一个包

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你看，这个包对吧

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那我们建立一个包

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叫

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1. 初始行为

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好

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然后呢

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在这个包下面建一个图

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建一个BDD

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叫功能分解

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叫BDD

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功能分解

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好

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我们来看，对照一下

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bdd，package 1.初始行为，功能分解

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有了，对吧

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那接下来就是这个问题了

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这个activity

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这个怎么弄

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那你在这里放上去一个block

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然后呢

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这里面选activity是没有的

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你加上去有没有

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你加上去可能，你看，activity

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得到的是BPMN什么的

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这个EA里面它支持好多种

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所以呢，这肯定不行的

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那怎么做

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就是说，activity as block，就是说

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把活动当成block 

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就是把活动拖到上面来

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所以我们应该在哪里

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应该在这里建一个activity

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就直接加一个activity，加一个活动

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活动叫什么呀

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蒸馏水嘛，对吧

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蒸馏水

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好

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再来一个

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加热水，煮沸水

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冷凝蒸汽

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加热水

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煮沸水

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冷凝蒸汽

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好

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这4个

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对吧

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这里有4个活动了

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然后呢

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首先这个了，把那个

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蒸馏水拖上来

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放在上面

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,

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你看，就出来了

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对吧

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然后呢

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这几个依次排列

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加热、煮沸等等

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加热

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煮沸

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错了

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煮沸

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冷凝

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好

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这个有了

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我们看看

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好

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那

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接下来，我们来建立它们的关联关系了

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你看这个组合关联

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这样关联下来

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对吧

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上面组合关联3个

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那我们

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把它摆平一点

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对齐

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好

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对齐

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好

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这样画下来

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然后呢，组合到部件

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对吧，这样

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然后呢

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我们来看

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它这个有方向的

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这个有方向的

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然后这个给它起了一个

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角色名叫a1

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这个activity叫a1

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相当于在这里面怎么称呼这个，这叫a1

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这叫a2

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这叫a3

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那怎么画

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就在关联这个里面画了

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加热水

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这个叫a1，角色名

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对吧

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然后呢，方向这是可导航的

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这个是单向

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不可导航的

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这样

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我们可以把这个变成

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私有

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这样来

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你看a1出来

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对吧

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单向的，我们可以把这个

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改成横竖横竖的

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按住Ctrl

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这样

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好

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还差什么

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还差这个

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这个adjunct这个，这个是辅助的意思

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它就对应活动图上面那个调用

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大活动调用小活动那个关系

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相当于把活动图上面对的活动搬到这里来

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然后在这里就

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