Thesis (MScEng)-- Stellenbosch University, 2013. / ENGLISH ABSTRACT: This work entails a study of the control software of transportation systems
for use in recon gurable manufacturing systems (RMSs). Various control approaches
are considered, with the focus on enhancing recon gurability. The
work is unique in the sense that the RMS is designed to manufacture small
parts/products and is meant to be used in developing countries. Manufacturing
systems that can ensure product quality and delivery, are a critical need
in countries where the bulk of manufacturing systems function with manual
labour. RMSs and holonic manufacturing systems (HMSs) are identi ed as
concepts that can potentially compete with manual manufacturing systems.
The competing system must thus have a low initial adoption risk, be able to
adapt to changing product functionality and demands, and have a comparable
throughput rate. IEC61311-3, IEC64199 function block and agent-based
control architectures are evaluated. The control software is tested on an experimental
conveyor system.
The thesis shows that IEC61131-3 and IEC64199 architectures are advantageous
in lower levels of control. IEC64199 function blocks provide human
interface and development tools and simpli es the distribution of control. The
human interface and development tools of IEC64199 function blocks may prove
bene cial in providing system monitoring and rapid low skilled adaptation of
the control system, increasing recon gurability of systems in under-developed
countries. Unfortunately, the low maturity of the development environments
for IEC64199 function blocks is a limitation. It is shown that an IEC64199
function block controller becomes complex as the actuator/sensor count exceed
10. Agent-based systems o er reliable control and powerful communication tools but requires a higher level of expertise than IEC64199 function blocks.
Agent-based systems are proposed for the core high level control. Complex
systems can be controlled with agents and intelligence can be added to control
systems in a recon gurable way. For the recon gurable control of large manufacturing
systems, agent-based control was found to be superior to IEC64199
function blocks. / AFRIKAANSE OPSOMMING: Hierdie werk behels 'n studie in die beheersagteware van vervoerstelsels vir
die gebruik in herkon gureerbare vervaardigingstelsels. Verskeie benaderings
word oorweeg, met die fokus op die verbetering van herkon gureerbaarheid.
Die werk is uniek in die sin dat die herkon gureerbare vervaardigingstelsel ontwerp
is vir die vervaardiging van klein onderdele/produkte en is bedoel vir
die gebruik in die ontwikkelende lande. Vervaardigingstelsels wat die kwaliteit
van die produk en a ewering kan verseker, is 'n kritieke behoefte in die lande
waar die grootste deel van die vervaardiging met handearbeid gedoen word.
Herkon gureerbare vervaardigingstelsels en holoniese vervaardigingstelsels is
geïdenti seer as konsepte wat moontlik kan meeding met die handmatige
produksie-stelsels. Die mededingende stelsel moet dus 'n lae aanvanklike aannemingsrisiko
hê, in staat wees om te kan aanpas by die veranderende produk
funksionaliteit en aanvraag, en 'n vergelykbare deurvloeikoers kan lewer.
IEC61311-3, IEC61499 funksie-blok en agent-gebaseerde beheer argitekture
word geëvalueer. Die beheer sagteware is getoets op 'n eksperimentele vervoerband
stelsel.
Die tesis toon dat IEC61131-3 en IEC61499 argitekture voordelig is in die
laër vlakke van beheer. IEC61499 funksie-blokke voorsien menslike koppelvlak
en ontwikkelings-gereedskap, en vereenvoudig die verspreiding van beheer. Die
menslike koppelvlak en ontwikkelings-gereedskap van die IEC61499 funksieblokke
is moontlik voordelig in die voorsiening van stelselmonitering en vinnige
laag-geskoolde aanpassing van die beheer stelsel. Dit mag dus moontlik
die herkon gureerbaarheid van stelsels, in onder-ontwikkelde lande, verhoog. Die lae vlak van volwassenheid van die ontwikkelingsomgewings vir IEC61499
funksie-blokke verlaag hul bruikbaarheid. Daar word aangetoon dat IEC61499
funksie-blok beheerders baie kompleks raak as die hoeveelheid van aktueerders
en sensors meer as 10 raak. Agent-gebaseerde stelsels bied betroubare beheer,
en kragtige kommunikasie-gereedskap, maar vereis 'n hoër vlak van kundigheid
as IEC61499 funksie-blokke. Agent-gebaseerde stelsels word voorgestel vir die
hoëvlak beheer. Komplekse stelsels kan beheer word met agente en intelligensie
kan bygevoeg word om stelsels te beheer in 'n herkon gureerbare manier.
Dit was gevind dat agent-gebaseerde beheer beter is as IEC61499 funksie-blok
beheer vir die herkon gureerbare beheer van groot vervaardigings stelsels.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/85767 |
| Date | 12 1900 |
| Creators | Le Roux, Anro |
| Contributors | Basson, A. H., Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering. |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | Unknown |
| Type | Thesis |
| Format | xvii, 109 p. : ill. |
| Rights | Stellenbosch University |
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