Discrete Event Based Monorail Material Handling Simulation System
Date Issued
2011
Date
2011
Author(s)
Jian, Zi-Yao
Abstract
AMHS(Automated Material Handling System) is widely used for transporting materials in fab. However, most of simulation model is not precise enough in speed and location calculation and not efficient. In this research, we proposed a discrete event based mono rail material transport simulation system for more realistic simulation in AMHS. The system includes vehicles and tracks in AMHS. However, stockers and production machines are not included. In this thesis, we use the custom motion frame to plan acceleration and deceleration for vehicles. With collision preventing algorithm, distance between vehicles are kept, and vehicle can prevent collision as a result. By using the motion frame planning technique, the discrete event is simulation system is reduced to New Delivery Request and Vehicle Exiting Track. With the reduced discrete event, the simulation system works more efficient. The animation event is also provided for animated simulation. User can verify simulation by watching process with animation. To make the track layout more realistic, 3-degree Bezier curves is used to simulate curved tracks in system .To fully simulate to collision prevention procedure, motion frame and junction are proposed. When multiple vehicle try to enter same junction, first come first served policy is used to prevent collision. Also, when multiple vehicles are moving on same track, distance should be kept to prevent collision. Since the machine and stocker is excluded in this model, New Delivery Request event is used to simulate delivery request generated by machine and stocker. Two custom track layouts are designed to find best number of vehicle. The performance index is also provided as the vehicle number changed.
Subjects
Automated Material Handling System
Simulation
Wafer-fab
Type
thesis
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