logistieke concepten college 5 (hoofdstuk 11 en 14 ronald h. ballou)
TRANSCRIPT
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Logistieke conceptenLogistieke concepten
College 5(hoofdstuk 11 en 14
Ronald H. Ballou)
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• Supply scheduling decisions
• Purchasing scheduling decisions
• Network Planning Process
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SUPPLY SCHEDULING
Meeting demand:
• supply just when needed production (MRP)
• inventory replenishment (JIT)
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Just in Time (I)
Japanese production philosophy:– juiste producten, juiste tijdstip, juiste plaats,
juiste kwaliteit, juiste hoeveelheid
• Inventory reduction– “voorraad is smeermiddel van knelpunten”
• Production: small size and zero defects
• Relation with supplier
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Just in Time (II)
• KAN card: produce a standard quantity
• BAN card: bring a standard quantity
• KANBAN control on department level
• Demand approach, i.s.o. hierarchical approach
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Just in Time (III)
leverancier opstellen assemblage programma klant
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Just in Time (IV)
Concern level:
• Hierarchical approach
• Quartile planning with horizon of 4 month: purchase orders to suppliers
• Capacity control (long horizon)
• Assemblage schedule with adequate mix of models (aabbaabbbaa)
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Material requirements planning (MRP I)
• demand forecasting
• from end-products planning the production of parts and materials
• bill of materials
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Bill of materials
sp aken
ven tie l
b an d
w ie l zad e l fram e
fie ts
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Schedule MRP I
• bruto behoefte
• orders onderweg
• voorzien voorraad verloop
• netto behoefte
• geplande ontvangst
• geplande beschikbaar
• geplande orderuitgifte
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Voorbeeld MRP I (doorlooptijd =2)(serie =8)
week 1 week 2 week 3 week 4 week 5 week 6 week 7
Bruto behoeftefiets
6 6 5 2 5 3 8
orders onderweg 8
voorzien voorrdverloop (act = 5)
7 1 -4 -6 -11 -14 -22
netto behoefte 0 0 4 2 5 3 8
geplandeontvangst (serie 8)
0 0 8 0 8 0 8
geplandebeschikbaar
7 1 4 2 5 2 2
geplande order-uitgifte (dlt =2)
8 0 8 0 8 0 0
Bruto behoeftewiel
16 0 16 0 16 0 0
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Problems MRP I
• demand uncertainty
• lead time uncertainty
• safety stock• Manufacturing Resources Planning (MRP II)
– koppelt planning en besturing– koppelt afdelingen
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Position MRP I/IIproductionplanning
demand
RCCP MPS
BOM MRP I inventory data
Detailed capacityplan (DCP)
Time phased req.record
Marterial and capacity plans
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Supply Chain Management
• Optimise the integral chain
• Integration of information
• Value Adding Logistics:– functies die thuishoren in material management
(assemblage, verpakken) verplaatsen naar de distributie keten
• Information technology
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PURCHASING
• selecting and qualifying suppliers
• contracting
• comparing price, quality and service
• evaluating the received values
• quality of ‘your’ end-products
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Purchase strategies
• purchase and percentage of sales value– productie onderneming– handelsbedrijf
• price reduction to all suppliers
• relation: more efficient production
• purchage on world wide web
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NETWORK PLANNING
• where are the demand points ?
• where are the warehouses ?
• where are the source points?
• Good network brings savings
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Data for network planning
• products in the product line
• locations– materiaal, productie, opslag en services.
• costs
• customer service level
• capacity
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Data sources and encoding
Sources• Business planning
documents• Reports• Logistic research• Published information
Encoding• Product coding
• Geocoding
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From data to information
• Product grouping
• Sales aggregation– geografische clusters– relatie cluster en verkoop concentratie
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Design the network
• Chart, compass and ruler techniques
• Simulation models
• Heuristic models
• Optimization models– regel van Camp
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Opdracht 3: besturing
• Casus: “de internet super”
• Geef in een presentatie (per groep) een advies over een besturingssysteem