Performance evaluation of a Flow Shop using Jsim
Last updated
Last updated
The flow shop is composed by 4 machines and 4 buffers connected . The processing time of each machine depends on the part (class) to be worked. The sizes of the buffers are reported in Table.
The failure and repair probabilities for each machine, considering two different failure modalities, are reported in Table
The systems includes 4 different machine type and 4 buffers located upstream of the system and between the machines
Consider the production of 3 parts (classes), whose production processes are reported in Table. In the case of open system, the generation rate is reported in Table
Open JSIM graph from the various tools in the home panel of JMT software
click ‘file’
open new file
Insert machines into the workspace by clicking the queue icon in the toolbar
Insert machine-1,2,3,4
Select the source icon in the toolbar
place it in the workspace
Select the sink icons in the toolbar
Place it in the workspace
Click on the connect stations icon and then connect all the stations with regard to the case
Clicking on this icon optimizes the layout
Click ‘Define Customer Class’ icon
Click on the Add class button in order to the add the parts
Write part name.
Select open in type option
Select the source
Note:Follow the same steps for Part-A and Part-B
Click on the edit button under interarrival time distribution
Select Exponential distribution
Enter the generation rate of each part
Note:Follow the same steps for Part-A and Part-B
Double click on queue-1
Modify the station name as B1-M1
Select finite under the capacity and then enter the value of buffer level+1 (11) in max no. customers box
Note:Follow the same steps for Queue-2,Queue-3,Queue-4
Click on Service Section
Enter number of machines
Click on Edit
Note:Follow the same steps for Queue-2,Queue-3,Queue-4
Select the deterministic distribution
Enter the process time value of the part with respect to the machine M1
Click OK
Note:Follow the same steps for Queue-2,Queue-3,Queue-4
Select Routing Section
Select Random as the routing strategy for part A in the routing section of the station
Define the strategy as random for M2 and for M3
Note:Follow the same steps for Queue-2,Queue-3,Queue-4
Click on ‘Define Performance Indices’
Click on Select an index option and select Throughput and Utilization
Select Class of each indices
Select Systems of each indices
Click on ‘Static-Resolution
Click ‘Done’
Run the Simulation
Throughput of:
Part A=0.0832
Part B=0.0991
Part C=0.1631
Utilization of:
M1=1
M2=1
M3=1
M4=0.7908