Agent-based multiple floors

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CSN asked Dec 19, '23 CSN commented Apr 9, '24

Agent-based multiple floors

Hello everyone,

I am trying to simulate an Agent-based multi floors scene using two methods, but Neither of them is well.

These models are based on HallwayTravel module in Agent Module Example Models.

1: Elevator

When using Elevator bank, people are stuck in the elevator, at this point, someone will be squeezed out and tranport to their start location.

The capacity is also incorrect.

Agent+Elevator.fsm

2: A* Bridge

Using Bridge as stair, people will leave the Bridge before reaching the first floor.

Agent+Bridge.fsm

Is there any way to solve these problems?

Software Version:

FlexSim 24.0.0

agent based

lift.gif (7.6 MiB)

stair.gif (14.8 MiB)

agentelevator.fsm (82.8 KiB)

agentbridge.fsm (163.4 KiB)

Answer 1 · 2023-12-20T21:05:58Z

Jeanette F answered Dec 20, '23 CSN commented Apr 9, '24

Hello @CSN ,

As for the Elevator model, in the Manual it says the following about Elevator Capacity and Traveler Capacity Usage.

"Elevator Capacity

Define the maximum capacity of an elevator. This is defined in whatever units of measure are used in the Traveler Capacity Usage property.

Traveler Capacity Usage

Define how much of an elevator's capacity a single traveler takes up. The default is to use the x/y footprint of the traveler plus the x/y footprint of anything the traveler is carrying."

So, if you want only 4 people to enter the elevator then you need to change the traveler capacity to 1.

When we ran the model in 24.0.1 we saw a bug similar to the following and we notified the dev team of it again.

As for the bridge issue we noticed if you turn off the social forces the issue goes away. Are you able to accomplish what you want without the social forces?

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CSN commented · Dec 21, 2023 at 09:12 AM

Hi Jeanette，Thanks for your answer! I think social forces are important on Pedestrian Evacuation, Some customers are concerned about this feature when designing buildings.

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Jason Lightfoot ♦ CSN commented · Dec 21, 2023 at 01:28 PM

I'd like to see the difference with an without the forces - your travellers are moving in the same direction so there will be no laning emergent behavior even in theory (let alone in practice).

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CSN Jason Lightfoot ♦ commented · Dec 22, 2023 at 02:03 AM

Hello jason, thanks for your advice! I tried using Astar only, yes it's traveling normally now.

I found that Agent is not suitable for two-way stairs but it runs well on one-way stairs. Therefore, I attempted to compare the differences between the Agent and Astar under one-way stairs:

Under the influence of social forces, the evacuation speed of agents is significantly slower. I think the Agent can also consider more aspects of impact, like counterflow. Experimental study on evacuation process in a stairwell of a high-rise building - ScienceDirect

Anyway, I think Astar is enough for people flow in most multiple floors scenes. Thank you all for your replies and suggestions!

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1703208450463.png (34.2 KiB)

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Jonah K ♦ commented · Apr 08 at 11:24 PM

@CSN This has been fixed in FlexSim 24.0.3 released today.

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CSN Jonah K ♦ commented · Apr 09 at 05:37 AM

Thanks, I will try it in the new version.

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