Ex_7.pdf

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EXERCISE 7 – Non-Deterministic Simulation Model of a Production Line
Create a new simulation model of a small manufacturing line producing stepped shafts fitted
with a bearing and find optimal arrival parameters.
Model Description:
The shaft is delivered to the Conveyor and transported to the NC Buffer from where it is
routed to one of two Numerical Controlled Machines, depending which NC machine is free.
From there the shaft is transported over the Deburring Station to the QC. There good Shafts
are passed on towards the Assembly Station while defective shafts are discarded to the
Defective Goods Storage. The Bearing is delivered to the Bearing Buffer directly. After the
Assembly Stations Parts Exit the system at the Output Storage.
Location
run
time
[min]
Conveyor
-
determine
NC
Buffer
-
determine
NC_1
2
1
NC_2
2
1
Deburring
5
1
QC
2.5
1
Bearing
Buffer
-
determine
Assembly
N(1.5,0.2)
1
Defective
Goods
Storage
-
1
Output
Storage
-
1
Capacity
Modelling Instructions:
Location – All necessary Locations
Entities – Create the Entities:
Shaft, Bearing
and
Waste
Path Networks – Add a transportation path and create all
Interfaces
Resources – Define one
worker
which will operate und transport all parts
User Distribution (Build/More Elements) – Create a discrete and non-cumulative
Distribution
which is Define by a Table with 30% (Value of zero) for Shafts which are
defective and 70% (Value of one) for Shafts which are good
6. Processing
a. Process
i. Assign the run times [USE
resource name
FOR
Run time]
ii. Join one Bearing with one Shaft [JOIN
Number of Elements Entity Name]
iii. At the QC use a Local Variable
Test
(INT Test) and assign the
Distribution
value to it [Test
= Distribution()].
Then create a routing rule based on the
Distribution value (IF… THEN…ELSE) such that good Shafts will be forwarded
to the Assembly Station (Test = 1) and defective Shafts will be discarded as
Waste to the Defective Goods Storage (Test = 0).
iv. At the Assembly Station the run time will be expressed as a Normal Distribution
for the run time of 1.5 min and a variance of 0.2 [N(1.5,0.2)]
b. Routing
i. Use the Move Logic:
MOVE WITH
resource name
THEN FREE
ii. Set the Transportation
Rule
for the Shaft
First 1
to the NC_1 and
First
to the
NC_2 at the NC Buffer
iii. Set the Transportation
Rule
for the Bearing
IF JOIN REQUEST
(at the Bearing
Buffer)
7. Arrivals – The
Shaft
arrives at the Conveyor and the
Bearing
at the Bearing Buffer.
Find the parameters for the Frequency and Occurrences such that: 12 Parts are
produced, the Utilization is maximum and the content in the NC Buffer, Conveyor and
Bearing Buffer is a minimum without any down time.
1.
2.
3.
4.
5.

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