How to avoid transporter collision without using Astar

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JHU asked Jul 24, '23 JHU commented Jul 27, '23

How to avoid transporter collision without using Astar

Hi all FlexSim experts,

In my model, the transporter 1 and transporter 3 collide with each other as shown in the screenshot below. I know that the network node and Astar cannot be used together. Since I already used network nodes, is there any ways to avoid the collision between transporters based on my model? Something like set a distance between two transporters?

Could anyone please kindly help me with this problem? I have attached my model for your reference. Any help would be appreciated. Please help, thank you!

0724.fsm

Best regards,

JHU

Software Version:

FlexSim 23.1.0

network node transporters collision avoidance

1690270629636.png (134.8 KiB)

0724.fsm (241.7 KiB)

Answer 1 · 2023-07-25T09:18:45Z

Felix Möhlmann answered Jul 25, '23 JHU commented Jul 27, '23

There are two ways to restrict the movement on travel networks. The connection type can block connections entirely or forbid task executers to pass (as in overtake) one another while mandating a minimum distance between them.

https://docs.flexsim.com/en/23.1/Reference/PropertiesPanels/TravelNetworkPanels/NetworkNode/NetworkNode.html

However, this is defined per direction (so oncoming task executers can still move through each other) and task executers at network nodes are generally ignored as far as the spacing is concerned.

The other possibility is to use Traffic Control objecs that can limit section of the network to only allow a specified number of task executers to enter at the same time. For example, only one forklift can be in an aisle at any time.

https://docs.flexsim.com/en/23.1/Reference/3DObjects/TravelNetworks/TrafficControl/TrafficControl.html

https://docs.flexsim.com/en/23.1/Reference/PropertiesPanels/TravelNetworkPanels/TrafficControl/TrafficControl.html

· 5

JHU commented · Jul 25, 2023 at 04:53 PM

@Felix Möhlmann Hi Felix thank you for ur answer. sorry I didn't clarify my question well. I am wondering that is there a way to keep two transporters at a distance at all times, rather than one transporter stopping and waiting for the other?

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Felix Möhlmann JHU commented · Jul 25, 2023 at 05:06 PM

Not really. You could try to use overlapping traffic zones. But any control system that allows more than one transporter in an aisle without also enforcing a one-way system will very likely lead to deadlock situations (this would also apply to A* and AGV networks).

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JHU Felix Möhlmann commented · Jul 25, 2023 at 05:26 PM

@Felix Möhlmann what would you recommend me to do?

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