工作日志
题目：基于Flexsim车间混流生产线的仿真建模与研究
(一) 项目介绍
基于Flexsim，对东风二汽发动机厂DCI 11和4H两条生产线进行模拟仿真，找出影响生产效率的因素，得出最佳的解决方案。
(二) 问题来源
公司生产计划编排都是采用人工编译作业，无法找出影响生产效率的关键因素，效率低，任务量大，没有找到一条科学的生产计划编排方法，很多都是一些事后补救工作。
(三) 要达到的目的
运用Flexsim 仿真软件对两条生产线进行模拟，观察是否存在堵塞、闲置等现象，找出影响生产效率的关键瓶颈，提出改进方法。
(四) 解决的具体步骤
① 确定工艺流程
1) 工艺流程：4H发动机：4H Testing 4H Painting 4H Eviromental Ware Inventary
DCi发动机：DCi Painting Subline 1/4 DCi Assembly line DCi Testing Subline DCi Enviromental Ware Inventary
2) 流程路线：4H发动机：4H Testing Testing Subline 4H Painting Buffer 4H Painting 4H Eviromental Buffer 4H Eviromental Subline Inventary(用 表示)
DCi发动机：DCi Painting Subline 1/4 DCi Assembly line DCi Testing Subline DCi Enviromental Subline Inventary(用 表示)
② 将车间布局的CAD图导入到Flexsim中，设定比例后，导入进去的CAD图形尺寸大小在Flexsim中一方格代表1米，通过CAD图形的导入，每台机器的位置，即可确定。
③ 添加实体，确定各个子车间的加工流程和各辆小车的运输路径。（2010-6-28～2010-7-4）
几点说明：
✓ 对于DCI11预装和拆预装的工艺流程还没确定，4H没有预装和拆预装）
✓ DCI 11预装与拆预装的时间为3.75分钟/台。
✓ 两种产品（DCI 11 和 4H）有预装上的差异，上下线点没有差异
✓ 4H 从装配线下线点到待试验区缓冲区的距离为174.2m。
✓ 传送带的速度设为1m/s。
✓ 检测器的预置时间为10秒，输送机暂存区的容量为10。
✓ 叉车只能沿着规定的路线行驶。
✓ DCI 11 1/4 小车的规格 1372×1330
4H 1/4 小车的规格 1220×930
✓ 到达检测车间的时间服从均值20，方差为2的正态分布
✓ 到达检测车间的产品类别（1,2,3）服从均匀分布
✓ 对于整个物流过程，应加入看板管理
③ 基于生产计划，针对各个子车间，加入投产序列
1）实现方法
应用合成器，加入全局表，即可保证指定的投产序列
2）具体实现方法
⏹ 油漆线和测试线的任务序列
PaintOrder
TestOrder
⏹ 油漆线和测试线的到达序列及其合成器的编译代码
1）Painting:
✓ Arrival Schedule :
✓ Combiner
/ Process Time : Return constant time of 0.
/ Combiner : Batch
/ Send To Port :
treenode item = parnode(1);
treenode current = ownerobject(c);
//**Conditional Port*/
//** \nIf some condition is true (equal to 1), send to a given port. Otherwise, send to a different port.*/
//** \nCondition: */
int condition =getlabelnum(item,"PaintLabel")==1;
//** \nPort if Condition is true: */
int port1 =1;
//** \nPort if Condition is false: */
int port2 = 2;
if (condition)
return port1;
return port2;
/ OnEntry :
treenode item = parnode(1);
treenode current = ownerobject(c);
int port = parval(2);
{ //************* PickOption Start *************\\
/**Update Combiner Component List*/
/** \nTable: */
string tablename = /**/"PaintOrder"/**/;
/** \n\nNote:
This option should only be used on Combiners.
Each column in the GlobalTable is the component list for a single itemtype.
The itemtype of the first flowitem to enter is used to find the correct column.
It is assumed that the global table has a row for each input port number 2 and higher.*/
/**\n\n*/
if(port == 1)
{ //The trigger on entry code fires each time a flow item enters the combiner.
//For this reason we check to make sure that the port entered is equal to 1
//because only the container will enter through port 1.
//The component list in a combiner is set up as a table. This allows us to use the cell commands to obtain the node that contains
//the number of items to retrieve from each port. Once you know what node contains the information you can use the setnodenum
//command to set the component list number based on the global table.
treenode thelist = getvarnode(current,"componentlist");
treenode thesum = getvarnode(current,"targetcomponentsum");
setnodenum(thesum,0);
for(int index=1; index<=2; index++)
{
setnodenum(cellrowcolumn(thelist,index,1),gettablenum(tablename,getitemtype(item),index));
inc(thesum,gettablenum(tablename,getitemtype(item),index));
}
}
} //******* PickOption End *******\\
2）Testing
✓ Arrival Schedule :
✓ Combiner
/ Process Time : Return constant time of 0.
/ Combiner : Batch
/ Send To Port :
treenode item = parnode(1);
treenode current = ownerobject(c);
//**Conditional Port*/
//** \nIf some condition is true (equal to 1), send to a given port. Otherwise, send to a different port.*/
//** \nCondition: */
int condition =getlabelnum(item,"TestLabel")==1;
//** \nPort if Condition is true: */
int port1 =1;
//** \nPort if Condition is false: */
int port2 = 2;
if (condition)
return port1;
return port2;
/ OnEntry :
treenode item = parnode(1);
treenode current = ownerobject(c);
int port = parval(2);
{ //************* PickOption Start *************\\
/**Update Combiner Component List*/
/** \nTable: */
string tablename = /**/"TestOrder"/**/;
/** \n\nNote:
This option should only be used on Combiners.
Each column in the GlobalTable is the component list for a single itemtype.
The itemtype of the first flowitem to enter is used to find the correct column.
It is assumed that the global table has a row for each input port number 2 and higher.*/
/**\n\n*/
if(port == 1)
{ //The trigger on entry code fires each time a flow item enters the combiner.
//For this reason we check to make sure that the port entered is equal to 1
//because only the container will enter through port 1.
//The component list in a combiner is set up as a table. This allows us to use the cell commands to obtain the node that contains
//the number of items to retrieve from each port. Once you know what node contains the information you can use the setnodenum
//command to set the component list number based on the global table.
treenode thelist = getvarnode(current,"componentlist");
treenode thesum = getvarnode(current,"targetcomponentsum");
setnodenum(thesum,0);
for(int index=1; index<=2; index++)
{
setnodenum(cellrowcolumn(thelist,index,1),gettablenum(tablename,getitemtype(item),index));
inc(thesum,gettablenum(tablename,getitemtype(item),index));
}
}
} //******* PickOption End *******\\
(五) 模型分析
出师表
两汉：诸葛亮
先帝创业未半而中道崩殂，今天下三分，益州疲弊，此诚危急存亡之秋也。然侍卫之臣不懈于内，忠志之士忘身于外者，盖追先帝之殊遇，欲报之于陛下也。诚宜开张圣听，以光先帝遗德，恢弘志士之气，不宜妄自菲薄，引喻失义，以塞忠谏之路也。
宫中府中，俱为一体；陟罚臧否，不宜异同。若有作奸犯科及为忠善者，宜付有司论其刑赏，以昭陛下平明之理；不宜偏私，使内外异法也。
侍中、侍郎郭攸之、费祎、董允等，此皆良实，志虑忠纯，是以先帝简拔以遗陛下：愚以为宫中之事，事无大小，悉以咨之，然后施行，必能裨补阙漏，有所广益。
将军向宠，性行淑均，晓畅军事，试用于昔日，先帝称之曰“能”，是以众议举宠为督：愚以为营中之事，悉以咨之，必能使行阵和睦，优劣得所。
亲贤臣，远小人，此先汉所以兴隆也；亲小人，远贤臣，此后汉所以倾颓也。先帝在时，每与臣论此事，未尝不叹息痛恨于桓、灵也。侍中、尚书、长史、参军，此悉贞良死节之臣，愿陛下亲之、信之，则汉室之隆，可计日而待也。
臣本布衣，躬耕于南阳，苟全性命于乱世，不求闻达于诸侯。先帝不以臣卑鄙，猥自枉屈，三顾臣于草庐之中，咨臣以当世之事，由是感激，遂许先帝以驱驰。后值倾覆，受任于败军之际，奉命于危难之间，尔来二十有一年矣。
先帝知臣谨慎，故临崩寄臣以大事也。受命以来，夙夜忧叹，恐托付不效，以伤先帝之明；故五月渡泸，深入不毛。今南方已定，兵甲已足，当奖率三军，北定中原，庶竭驽钝，攘除奸凶，兴复汉室，还于旧都。此臣所以报先帝而忠陛下之职分也。至于斟酌损益，进尽忠言，则攸之、祎、允之任也。
愿陛下托臣以讨贼兴复之效，不效，则治臣之罪，以告先帝之灵。若无兴德之言，则责攸之、祎、允等之慢，以彰其咎；陛下亦宜自谋，以咨诹善道，察纳雅言，深追先帝遗诏。臣不胜受恩感激。
今当远离，临表涕零，不知所言。
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