什么是系统工程（字幕）22
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那么下一个呢，就是
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图16.12
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这是一个活动图
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表达了蒸馏这个水的
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过程的
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这个活动
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它里面的一个分解
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那我们来看这个图
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你看，这个是活动图
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然后是针对这个activity
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这个蒸馏水这个activity来画的
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图的名字叫简单流
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那现在我们先来把这张图给建起来
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那活动图指的是什么
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给一个活动画的图，是描述一个活动的图
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也就是说，活动图里面
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这里面是没有活动的
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活动图是描述一个活动的图
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这里面这些叫action
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动作
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那我们现在把这个图建起来
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是针对这个活动嘛
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对吧
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这活动在哪里呀
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这个收起来
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刚才是在这里
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对吧
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这里
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蒸馏水这里，对吧
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它下面有三个
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子活动
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右键点这个
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添加
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添加一个图
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这些都
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要SysML的
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SysML1.5
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活动
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然后，图的名字叫什么呀
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简单流
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OK
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好
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你看
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对比一下
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activity
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蒸馏水，简单流，对吧
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那首先我们来画这个了
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这个
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是这个活动的
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蒸馏水这个活动的参数
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你看，脏水，左边是in
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右边就是输出
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一个输入，一个输出
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当然，你要是把这个放在右边，也没问题
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但习惯性就把这个放左边
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它不是由这个位置定的
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而是在这里面，一会我们看设置的时候
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它会有这个
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方向，对吧
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输入输出的方向
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一个脏水冷水
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一个是外部的热源的热
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对吧
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一个水，一个热，进来
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出去是什么
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废热
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还有净水
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这两个
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对吧
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那这个是
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两个输入的参数
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两个输出的参数
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那这个要先
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建起来
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针对这个活动建起来
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那
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我们
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先给它加参数
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你看，添加
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活动参数这里
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那我们看这个名字，第一个是
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冷的污水，对吧
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冷的脏水
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冷的污水
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这是名字
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这里有个参数
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然后呢
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我们针对这个参数来设置它的类型
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然后，这里，然后，这里，参数
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类型，它是H2O是吧
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那这里得找到那个H2O
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就这个
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好
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保存
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好
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冷的污水
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在这里
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然后它的方向是
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进入的
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但这里并没有体现
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因为我们这个图是刚才这个出现之前
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画的，拖上去的
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如果你要体现
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你看，可以把它删掉
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然后这个时候，再建
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又回来了
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1.5
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Activity
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简单流
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你看，冷的污水在这里
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对吧
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当然，一会我们可以把它拖上来
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接下来，就是
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下一个参数了
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这是
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外部
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外部热源
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外部热，对吧
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外部热
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那这个下一个参数
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针对这个添加一个参数
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外部热
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它的类型
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是热
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就是前面我们在项类型里面定义的，这个地方是吧
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好
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再来
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还有
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废热
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类型也是热
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还有什么
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这个方向
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是
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这个
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往外的
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好
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还有一个是
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净水
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类型是水
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好
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这样来