How to simulate a crane attachment?

Question

question

Ben O asked Apr 07 2018 at 6:39 PM Ben O published Apr 12 2018 at 3:57 PM

How to simulate a crane attachment?

I am trying to simulate an attachment to a crane, whereby an object (eg a cylinder) is moved to a queue holding a single flowitem, that flowitem is loaded onto the cylinder, the crane then moves the cylinder to a (floor storage) rack bay, the cylinder unloads, then it is moved back to the queue to get the next flowitem.

I am currently trying to use a BasicTE or TaskExecuter to achieve this, but do not know how to program either to do so.

Any help would be greatly appreciated.

crane crane movement cranes

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Joerg Vogel commented · Apr 08 2018 at 8:06 AM

What is the cylinder? Is it a transport unit like a pallet or a tote, that contains the item while the crane transports the item? Or is it more a support part like a traverse that belongs and is connected to the crane?

If the item is stacked on the cylinder before the transport starts then this process combines the cylinder and the item. You can use a combiner for such an operation. The cylinder is then an item item, too. The cylinder belongs to the item class, that can stack items like a pallet or a tote. You can make copy of a pallet in the flow item bin and then change the 3D shape of the pallet to a cylinder.

If the cylinder is an extension to the crane hook like a traverse, then you open the properties of the crane and switch to the General tab.

You push the second Edit button from the top in the Visuals/Animations area of the Appearance field. The main window contains then 4 sub windows showing the crane in three normal views and a 3D view. Below you find a Animation creator tool. You need only to push the green plus sign to add an extra object to the crane hook. The object looks like a cube. You can mark the object and edit the visuals at the Quick Properties. If you need the cylinder as a shape you find it in the program directory of FlexSim under fs3d/General.

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Ben O Joerg Vogel commented · Apr 09 2018 at 3:52 PM

It is basically equivalent to a pallet, in that the item is contained within it while transported then unloaded into the rack.

I thought about using a combiner, but the only problem is that the item must unpack from the cylinder object to be loaded into the rack, and I can't have 100 separators over the floor rack.

As with the reply below, I would be happy to change the visuals of the crane, but the object on which items get loaded must be separate and have it's own MTBF and MTTR, with a backup to be used in the event of failure.

I have attached a rough model which basically does exactly what I need, apart from that the cylinder moves by itself, whereas I would like it to be transported by the crane.

I hope this insight is helpful and makes it more obvious with regards to what I am hoping to do.

charger-test.fsm

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charger-test.fsm (25.8 KiB)

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Answer 1 · 2018-04-09T14:30:14Z

Kari Payton answered Apr 09 2018 at 2:30 PM Ben O published Apr 12 2018 at 3:57 PM

@Ben O If you want to visually change how the crane looks, add another object in the animations pane.

In crane properties "general" tab, go to edit Visuals/Animation. Then add another object by clicking the green plus sign in the Animations and Components Pane. You can then change this object to be whatever you want by going to it's general properties tab. crane-visuals.fsm

crane-cylinder.png (90.5 KiB)

crane-visuals.fsm (24.2 KiB)

· 11

Ben O commented · Apr 09 2018 at 3:53 PM

Thank you for your response, I would be happy to change the visuals of the crane, but unfortunately the object on which items get loaded must be separate and have it's own MTBF and MTTR, with a backup to be used in the event of failure.

I have attached a rough model which basically does exactly what I need, apart from that the cylinder moves by itself, whereas I would like it to be transported by the crane.

charger-test.fsm

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charger-test.fsm (25.8 KiB)

Kari Payton Ben O commented · Apr 09 2018 at 5:24 PM

@Ben O ok. Try the attachment. You can use a SubFlow to coordinate activities between two resources. You may have to play around with the speeds to get everything to move exactly at the same time. I also included in the flow a check to see which resource is not idle at the time. 11393-charger-test-1-edited.fsm

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11393-charger-test-1-edited.fsm (32.9 KiB)

Ben O Kari Payton commented · Apr 09 2018 at 6:30 PM

@Kari Payton thank you for your help, unfortunately when I open the attached file, all I see is an empty model and I can't add anything into it either.

Is there a specific way to open the file which I could try?

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Ben O commented · Apr 09 2018 at 7:47 PM

@Ben Wilson unfortunately I am using a university provided version 16.2.0, and as such I cannot update to, or install, any more recent versions (university owned computer administrator restrictions).

I would download an express version on my own laptop to take a look, but from what I can see here on the downloads page, there is no version for Mac OS, and I only have access to a MacBook Pro.

It seems I am a bit stuck here, I really appreciate your help @Kari Payton and I'm sorry I currently can't utilise it as I would hope to.

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Kari Payton Ben O commented · Apr 10 2018 at 4:02 PM

11393-charger-test-1-editedflexsim2016.fsm try again in 2016 with this file. @Ben O

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11393-charger-test-1-editedflexsim2016.fsm (32.8 KiB)

Ben O Kari Payton commented · Apr 12 2018 at 3:57 PM

Thank you so much for taking the time to get it working in the 2016 version.

It now opens and loads correctly, it took me a couple of tries with no success due to the errors below, but after one reset it began to work as expected.

As you say I'll have to tweak it a bit and I'm currently trying to understand the whole subflow system, but thank you again for showing that it can (kind of) be done, I really appreciate it.

If only cranes could transport task executers it would be so much simpler...

time: 7.118059 exception: Exception caught in start() of activity "Join" in "SubFlow". Continuing throw...
time: 7.118059 exception: Exception caught in TreeNode::callMemberFunction() c++/dll execution. Throwing...
MODEL:/Tools/ProcessFlow/SubFlow/Unload>variables/callbackNode c: /Tools/ProcessFlow/SubFlow/Unload>variables/callbackNode thisClass: /Tools/ProcessFlow/SubFlow/Unload>variables/callbackNode
time: 7.118059 exception: Exception Caught in TaskExecuter::beginTask(treenode task) object: /Crane1
time: 7.118059 exception: Exception Caught in TaskExecuter::finishTask(treenode task) object: /Crane1
time: 7.118059 exception: Exception Caught in TaskExecuter::onTimerEvent(treenode involved, int code, char *datastr) object: /Crane1
time: 7.118059 exception: Exception Caught in TaskExecuter::onTimerEvent(treenode involved, int code, char *datastr) object: /Crane1time: 7.118059 exception: Exception Caught in ObjectFunction251__project_library_FlexSimObject_behaviour_eventfunctions_OnTimerEvent object: /Crane1 i: /Crane1>variables/activetasksequence/ts3/task1 class: /Crane1
time: 7.118059 exception: Exception caught in TreeNode::receivemessage()
time: 7.118059 exception: Exception caught in Executive::processeventinlist(). Throwing.
time: 7.118059 exception: Exception caught in Executive::steptotime(). Throwing.
time: 7.118059 exception: Exception caught in Executive::tick(). Throwing.
time: 7.118059 exception: int runthemessageloop() #4
exception: core->theexecutive.tick();
time: 7.118059 exception: int runthemessageloop() #6

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Ben Wilson ♦♦ Ben O commented · Apr 09 2018 at 8:01 PM

My understanding is that the Mac virtualization options are no better now than they were 2 years ago, at least as far as graphics support is concerned. So that leaves Bootcamp.

If you were able to set up dual-booting on your Mac, that would appear to be your only option. Or working with the university to get a newer version installed.

Newer versions of FlexSim can be installed on the same system with older versions, so it would be safe to have both 18.0 and 16.2 installed on the same computer at the same time. In your university's case, the 16.2 would remain licensed, but the 18.0 would run in the free Express configuration

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