topic Re: How use multiple crane on same rails in FlexSim Forum

How use multiple crane on same rails

nikhil_rane9NJAU — Tue, 06 Sep 2022 06:32:53 GMT

[ FlexSim 22.2.1 ]

I am using 3 hoist on same rail. I want put constraint that when hoist 1 is moving hoist 2 will wait

when hoist 3 working hoist 1 and 2 will wait

i am attaching model for reference. can you please help

File name (Hoist Simulation)

Re: How use multiple crane on same rails

jason_lightfoot_adsk — Tue, 06 Sep 2022 07:14:16 GMT

Which has priority ? Should hoist 1 and 2 get out of the way of the job hoist 3 is doing? Should they interrupt their work or will the hoist 3 job wait until they are inactive?

The simplest way will probably be to use a process flow for Hoist3 that creates a task sequence on hoists 1&2 to hold them somewhere while hoist 3 is in operation.

Attached is an example that detects the job Crane3 receives. The creation of task sequences on Cranes 1 and 2 holds them until the task sequence is finished - those sequences could be made to preempt with a higher priority and so interrupt their jobs. Currently it waits until Crane 1 & 2 make themselves available (make the task sequence active).

Hoist Simulation_jl.fsm.pdf

Re: How use multiple crane on same rails

jason_lightfoot_adsk — Tue, 06 Sep 2022 07:15:24 GMT

You could also add travel to loc tasks for crane 1 & 2 to clear the path for Crane 3.

Re: How use multiple crane on same rails

nikhil_rane9NJAU — Tue, 06 Sep 2022 07:25:38 GMT

Hi Jason,

Thanks for support. in model we 1 and 2 are moving simultaneously. I want to work 1 hoist at time. other 2 should be stopped. I don't the priority for the task

Re: How use multiple crane on same rails

jason_lightfoot_adsk — Tue, 06 Sep 2022 07:36:31 GMT

Hoist Simulation_jl2.fsm.pdf

Like this?

Re: How use multiple crane on same rails

nikhil_rane9NJAU — Tue, 06 Sep 2022 11:10:20 GMT

Hi Jason, Model is stopping at 16707 sec. I tried not able to figure out why.

would you help?

Re: How use multiple crane on same rails

jason_lightfoot_adsk — Tue, 06 Sep 2022 14:24:50 GMT

This will be a little more involved - my goal was to just have something you add without changing the way you create and dispatch task sequences.

Putting all the jobs in a list would make things much easier.

Re: How use multiple crane on same rails

jason_lightfoot_adsk — Tue, 06 Sep 2022 17:46:18 GMT

In the attached model I detect the task sequence being received on the crane and push it to a list which is then processed sequentially. I use a travel to loc when changing crane to move to its 'home' location (label) and removed that function from the unload trigger. Task sequences that are re-dispatched have the priority set to -1, which is used to prevent it being detected as a new task sequence a second time.

Hoist Simulation_jl3.fsm.pdf

Re: How use multiple crane on same rails

nikhil_rane9NJAU — Wed, 07 Sep 2022 08:59:52 GMT

Thanks Jason