NDLI: Simulation of discrete conveyor systems

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Modeling and simulation applied to communications systems

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Some extentions and limitations of frequency domain experiments

The global simulation clock as the frequency domain experiment index

Alternative methods for generating and analyzing the output series of frequency domain experiments

Analysis of different AGV control systems in an integrated IC manufacturing facility, using computer simulation

Simulation of discrete conveyor systems

Bridging the gap: transferring logic from a simulation into an actual system controller

Performance analysis of automatic storage and retrieval systems—a comparative approach

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Why a single aisle miniload system is not simple to model

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Analysis of low inventory manufacturing using MIM

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A preliminary group technology classification scheme for manufacturing simulation models

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A space logistics simulation implementation in Ada

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Validation of a simulation model of the national airspace system

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CONVERSIM: a teaching simulation language incorporating a conversational model builder

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Simulation and material handling system design (panel)

Simulation of discrete conveyor systems

Content Provider	ACM Digital Library
Author	Hopings, Donald B.
Abstract	Most of the conveyors that appear in simulation models tend to be fairly simplistic. The conveyor only provides a means of moving an object from one place to another. It is driven by a single speed motor and very little, if any, control logic is applied during operation. A number of objects or products can be conveyed in this manner with no difficulty. For example, boxes, kitting tubs and pallets of bricks are all relatively sturdy and relatively insensitive to damage. In fact, the conveyor system may be designed such that the objects touch or accumulate at a given station. The flow of objects through the system is also important. If there is a momentary stoppage in the system, the input of objects to the system may be interrupted so that saturation is avoided.However, what if the product is very sensitive to damage and input to the system cannot be temporarily interrupted? Such a system requires a high degree of control over the operation of the individual conveyor sections. In order to develop a control philosophy and thereby shape the simulation logic, we must first understand the constraints of the product and how it is produced.We all know that glass is naturally fragile. Excluding breakage, the product may be rendered useless due to edge damage or surface damage. Edge damage occurs when adjacent pieces collide. Usually both are damaged beyond usefulness. Prevention of these collisions means that only one piece can occupy our smallest, definable control unit. In this case, the smallest, definable control unit is one conveyor section. Surface damage is due to abrasion. This is caused by relative motion between the piece and the conveyor. In practice, the constraint must be that adjacent conveyors must be running at the same surface speed.Using the previous two concepts as a foundation, we can develop control logic, and therefore simulation rules and constructs to deal with specific problems. Some of these problems are: right-angle transferring, equipment that necessarily runs at something other than line speed and increasing the separation between adjacent pieces. Sample simulation code will be presented in GPSS/H. The reader is invited to implement the constructs in other simulation languages.
Starting Page	575
Ending Page	582
Page Count	8
File Format	PDF
ISBN	0911801421
DOI	10.1145/318123.318267
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1988-12-01
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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