Originally posted by: jonsonleou

Hello,

My name is Jonson from Taiwan, I am studying the flow job scheduling problem from Cplex existing examples.

As the model is a gap with the real production environment, I tried to extend this optimization model to parallel machines for multi stage/station problem, unfortunately it didn't work, as the attached file. I am not sure it can be solved by Cplex, or here is a similar example for reference? ask you help here!
 

Thanks,
 

Jonson

Originally posted by: GGR

Hi Jonson

Is your question about modeling a flow shop scheduling problem with CPlex?

If yes you are not posting your question on the right forum (you should used on of the Mathematical Programming category.

If you wish to use the capabilities of CP Optimizer in scheduling, you will file example of shop scheduling and sequence scheduling in the distribution.

Hope that helps

Originally posted by: jonsonleou

HI Rogerie:

Thanks for your kindly reply,

Yes, I am studying the shopfloor scheduling problem solved by Constrain Programming, and have checked several similar examples bundled inside ILOG Cplex IDE, such as open-shop problem, flexible job-shop problem, shop scheduling with trolley, and even house building problems.

I find these examples constructed only one resource by one step problem, it's too simple to meet the real requirement, hence tried extending flow-shop problem for multi-resources assignment, the result is failed.....

My purpose is to find a parallel machine dispatching problem example, therefore post my request in here to search for someone support.

Yours sincerely,

Originally posted by: GGR

Hi Jonson

If I understand well your problem, I suppose you work with the OPL Ide application. Let's admit a job is made of a set of tasks linked by precedence constraint  and a task can be executed by a subset of the machines. Let's call an operation , the execution of a task by a machine.

You describe the breakdown structure of a job as a span of task and the tasks as an alternative of operation. That is you create interval variables for each job, task and operations (those being optional) and use a sequence variable of operation for each machine that you constraint with a non-overlap. Examples in the distribution is sched_joshopflex and, for more sophisticated examples sched_rcpspmm. As a start, that is wihtout choice of machine, have a look to sched_joshop, shed_flowshop, sched_openshop and sched_rcpsp samples.

Hope that helps

Originally posted by: jonsonleou

Hi Rogerie:

Sure, I found them and it did really work.

Thank you again in here to show my sincere appreciation for the answer,

Ps. If anyone requires the similar problem model, let me know to post my modified solution for reference.

Cheers,

Originally posted by: Dr.Meng

Hi Jonson:
My name is Leilei Meng from Huazhong University of Science and Technology,Wuhan.I find the examples for reference（SaRonix-eCera.Demo.rar） are not correct.
Have you solved your problem（extending flow-shop problem for multi-resources assignment）?I  am also  interested in  your problem,  and can  you send the correct model for reference?
Yours sincerely,

Leilei Meng

Originally posted by: kcapt

Dear jonsonleou,

Do you still have the parallel machine dispatching problem example or the solution that you found?

Thank you and I know it has been a few years...

Originally posted by: jfjjfj

I am also interested in this problem. Though this posts are very old, maybe there is an available solution now?

You may upload it here.

Originally posted by: PhilippeLaborie

Hello,

You can have a look at the distributed example sched_jobshopflex that describes the classical version of the flexible jobshop scheduling problem.

It can very easily be extended to a more complex case where an operation requires more than one resource.

If you need more help for formulating your scheduling problem in CP Optimizer, could you provide a description of your problem?

Originally posted by: jfjjfj

Thank your very much for your answer, but I already solved the problem with an technique.

Originally posted by: kcapt

Dear jfjjfj,

Can you share your technique?

Thanks a lot!

Originally posted by: jfjjfj

Hi kcapt,

sorry, I can't remember what "solution" I meant back then, but I never finished this project, so I suppose the solution didn't work.

Sorry!