Klasifikasi pengendalian sistem produksi
MRP 1
Push system MRP II
ERP
Pull system
Conwip model
Kanban system
JIT SYSTEM
Filosofi push system
Start date
Production system
Due date
Lead time
Start Date = Due Date – Lead Time
Push system – MRP IIDemand forecast
MRP
Demand forecast
MPS
Agregate planing
CRPJob pool
Job release
Job dispatcingRouting data
Inventory status
BOM
RCP
20
CONWIP Controller
PC
PN Quant–— ––––––— ––––––— ––––––— ––––––— ––––––— ––––––— ––––––— ––––––— ––––––— ––––––— ––––––— ––––––— –––––
Work Backlog
. . .
Workstations
PC
21
Push and Pull Schematics
StockPoint . . .
Pure Push (MRP)
. . .
. . .
Pure Pull (Kanban)
CONWIP
…
Full ContainersAuthorization Signals
StockPoint
StockPoint
StockPoint
StockPoint
StockPoint
22
Using MVA to Evaluate Line Performance
0
0.1
0.2
0.3
0.4
0.5
0.6
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32
WIP
Thr
ough
put
Best case
Worst case
Practical worst case (ce(j) = 1)
Reduced variability (ce(j) = 0.5)
23
CONWIP vs. Pure Push Comparisons
-20
-10
0
10
20
30
40
50
60
70
0% 20% 40% 60% 80% 100% 120% 140%
Control as percent of optimal
Pro
fit
Push
CONWIPOptimum
Efficiency
Robustness
Referensi
• http://en.wikipedia.org/wiki/Kanban• http://blog.brodzinski.com/2011/09/pull-push-kanban.html• http://en.wikipedia.org/wiki/Push%E2%80%93pull• http://
www.automationmag.com/images/stories/LWTech-files/73%20Pull%20Kanban.pdf
• http://pushpull.bg/