标题: 基因演算法用于增加产能的研究-以TFT-LCD厂Array制程RGV搬送为例
Using GA to Increase Throughput for RGV Based TFT-LCD Array Fab
作者: 纪碧如
Pi-Ju Chi
曾宪雄
Shian-Shyong Tseng
资讯学院资讯学程
关键字: 搬送系统;搬送策略;基因演算法;TFT-LCD;阵列制程;RGV;产能;AMHS;Transport Strategy;GA;TFT-LCD;Array;RGV;Throughput
公开日期: 2005
摘要: TFT-LCD厂主要分为三大制程:阵列(Array)、组立(Cell)、模组(Module),其中阵列制程由于机台昂贵,最重视的是机台使用率及产能。本研究是针对阵列制程的工厂,此工厂会因为不同机台制程特性的不同,将工厂划分成为数个区域,再针对区域配置适合的机台设备,并且每个区域内是由RGV(Rail Guided Vehicle)负责搬送。此工厂的特性是每个区域同一时间会有许多的搬送命令,而RGV一次执行一个搬送命令来完成区域内的搬送工作。因此,藉由调整区域中RGV搬送的顺序,就可以影响区域整体的生产时间,进而提升区域的产能。
而目前相关研究,一般而言皆只是提出一、两个影响搬送效能的因素,找出改善小部分状况的方法,如此未能考虑其他大部分的状况,也没有探讨其他因素的影响。另外,这些研究皆是针对在AGV(Automated Guided Vehicle)搬送下,因此结果是针对AGV的特性,无法应用到其他特性的工厂中。
因此,本研究希望针对阵列制程工厂的单一特定区域,导入一适用于RGV特性的搬送策略来选择搬送命令,进而提升区域的产能。首先建立一个尽量符合现实工厂状况的模拟器,并提出相关的假设,如每次离开此特定区域后再回到区域的时间。制作此模拟器主要是希望利用模拟器计算此特定区域的总生产时间,利用生产时间来评估区域产能的大小,时间愈短表区域产能越高。接下来提出搬送策略为命令属性的线性组合。由于属性之间的组合复杂且互相牵制,故利用基因演算法找出较适合的权重,得到一个针对此特定区域较适合的搬送策略,如此一来就可以藉由此搬送策略提升区域产能。经由实验的结果,不同的搬送策略对于同一个区域生产时间有显着的影响,针对特定的区域可找到较适合的搬送策略,可以有效减少区域生产时间提升区域产能。
As we know, TFT-LCD factory contains three major process:Array, Cell, and Module. Because the manufacturing equipments in Array are more expensive than others, we are very concerned with the throughput and the utilization rate of the equipments. TFT-LCD Array factory can be divided into several areas according to different process features of equipments, and then we will configure equipments and RGV (Rail Guided Vehicle) for transporting Lot between equipments for each area. The issue of factory is how can we choose one command from several transport commands in the area to improve transport efficiency since RGV only handles one command at a time. Therefore, the ordering of the commands can affect total manufacturing time and increase throughput in an area.
In related researches, which are based on AGV transport and can only be applied for AGV behavior, only one or two factors influencing transport efficiency have been proposed.
Hence, we hope to find an appropriate transport strategy to reorder transport commands for RGV in an Area of TFT-LCD Array Fab to increase throughput. First, we set up a simulator that is similar to real factory with some assumptions such as the time between Lot leaving the area and coming back to the area should be constant. Since simulator can calculate the manufacturing time of all Lots in the area, we thus evaluate throughput using the total manufacturing time where the less total manufacturing time indicates the throughput is high. Then we propose a transport strategy which is the linear combination of commands’ attributes, and then use GA to find more suitable weight and get one transport strategy in a specific area. Applying the obtained transport strategy to the specific area will increase throughput in this area. The experimental results show that difference transport strategy will affect manufacturing time obviously, and that specific transport strategy for specific area will reduce manufacturing time effectively and increase throughput in this area.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT009367622
http://hdl.handle.net/11536/80131
显示于类别:Thesis


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