LabAssignment09
pptx
keyboard_arrow_up
School
Louisiana State University *
*We aren’t endorsed by this school
Course
4530
Subject
Industrial Engineering
Date
Dec 6, 2023
Type
pptx
Pages
7
Uploaded by GeneralGoldfish826
Lean Manufacturing Systems
IE4530
Lab #9
Lean Manufacturing Systems (IE4530)
Department of Mechanical and Industrial Engineering
Problem Requirements:
•
Determine and document in your lab report
•
How many buses are needed such that average wait times for visitors at the different stops are
all under 20 minutes?
•
How many are needed if the arrival rate to this area is 600/hour rather than 400/hour (600/hr is
more typical in peak season)?
•
You will need to modify the bus control entity logic to test this. Use 10 replications of 8am-
4pm to determine the average waiting times.
•
You do not need to submit the model file for this problem.
Problem #2 (cont.)
Lean Manufacturing Systems (IE4530)
Department of Mechanical and Industrial Engineering
Storage, Queue Scan/Search Operations,
Resources Seized for Multiple Operations
At a foundry, after castings are removed from their molds they are at about 300
C. They are then
moved to a storage area to cool until at or below 30
C (cool enough to handle). Cooling occurs at
a rate of
300*exp(-T/W), where T is time cooling and W is weight in lbs. Casting weight is
uniformly distributed between 50 and 300lbs. Castings arrive approximately one every 5
minutes.
Once sufficiently cooled, castings are moved by forklift (1 available) to a cleanup area (capacity
2), where sand & sprue materials are removed (expo(7) minutes)
They are then moved to a machining area (capacity 2) by forklift. In addition to the machine,
they must obtain a fixture (5 available). The casting is mounted to the fixture (expo(2) minutes)
and then machined (expo(6) minutes).
The casting and fixture are then moved by forklift to a testing area (capacity 2), which takes
expo(7) minutes, including removing from the fixture. The casting then leaves the system via
forklift.
Distances: storage to cleanup: 20m; all others 10m apart (in a line). Forklift speed 1.8m/s along
travel lanes network
Demo only required for this problem.
Problem #4
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
Lean Manufacturing Systems (IE4530)
Department of Mechanical and Industrial Engineering
Model Structure
Problem #4 (cont.)
Detached
Queue
Lean Manufacturing Systems (IE4530)
Department of Mechanical and Industrial Engineering
Steps (slide 1 of 3):
1.
Layout structure as shown. All connections are
bidirectional paths
. Make sure distances between
stations are correct.
2.
Set all source and server output
TransferNodes
to Entity Destination=By Sequence, Ride on
Transporter=True, Transporter Name=Forklift
3.
Create a
sequence table
(Data / Add Table / Sequence Table) visiting inputs at cleanup, then machining,
then testing, then sink. Use default name (
SequenceTable1
).
4.
Create a storage element named CoolingArea (Definitions / Elements/ add "Storage" and specify name)
5.
Create two
ModelEntity
state variables
:
CastingWeight
(real) and
TimeCooled
(datetime) (click
ModelEntity, then definitions, then States, then add from types at top left)
6.
Create a
Model
state variable
:
RemovedCount
(integer)
(click Model, then definitions, then States, then add from types at top left)
7.
Add a
Detached Queue
animator (Animation / Detached Queue) and layout as shown for the cooling
area. Set its Queue State = CoolingArea.Queue.
8.
Add the
floor labels
(Drawing menu) for "COOLING AREA" and "Number Finished Cooling:", and the
status label
(Animation menu) below the number finished label (expression=RemovedCount)
9.
Casting entity
: Initial Travel Mode=Network Only, Initial Sequence=SequenceTable1
10.
Forklift vehicle
: Initial Desired Speed=1.8m/s, Initial Travel Mode=Network Only, Initial Node
(home)=Input@Cleanup
11.
Fixture resource
: Initial Capacity=3
Problem #4 (cont.)
Lean Manufacturing Systems (IE4530)
Department of Mechanical and Industrial Engineering
Steps (continued, slide 2 of 3):
12. Source1
: Entity type=Casting, IAT=Random.Exponential(5) minutes, state assignments
under "Before Exiting":
•
State variable=ModelEntity.CastingWeight,
New Value=Random.Uniform(50,200)
•
State variable=ModelEntity.TimeCooled,
New Value=1.2611*ModelEntity.CastingWeight+TimeNow (in minutes)
13.
Cleanup server
: Initial Capacity=2, PT=Random.Exponential(7) minutes
14.
Machining server
: Initial Capacity=2, Proces Type="Task Sequence", Processing Tasks:
•
Add task: Sequence Number=10, Name=AttachToFixture, PT=Random.Exponential(2) minutes; leave resource
name blank (machine is already reserved)
•
Add task: Sequence Number=20, Name=PerformMachining, PT=Random.Exponential(6) minutes; leave resource
name blank
Also, under Secondary Resources / Other Resource Seizes / Before Processing, add a
row: Resource Type=Specific, Resource Name=Fixture
15.
Testing server
: Initial Capacity=2, PT=Random.Exponential(7) minutes. Under
Secondary Resources / Other Resource Releases / After Processing, add a row:
Resource Type=Specific, Resource Name=Fixture
Problem #4 (cont.)
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
Lean Manufacturing Systems (IE4530)
Department of Mechanical and Industrial Engineering
Steps (continued, slide 3 of 3):
16.
Select the Output@Source1 node.
Add an
add-on process
for the "Entered" trigger.
Configure as shown:
•
Decide step
: Decide Type=Condition Based, Condition= Entity.Is.Casting
•
Insert step
:
Queue State Name=CoolingArea.Queue
•
Scan step
:
Condition= ModelEntity.TimeCooled <= TimeNow
•
Remove step
: leave Queue State Name blank or set the same as for insert
•
Assign step
: State Variable Name=RemovedCount, New Value=RemovedCount+1
Demo only required for this problem
Problem #4 (cont.)