How can I stop an object with deceleration ?

Question

question

Fabio G10 asked Aug 30 2022 at 11:16 PM Felix Möhlmann commented Sep 06 2022 at 1:00 PM

How can I stop an object with deceleration ?

Hi everbody.

I have a crane that is travelling to a location in a warehouse. How can I perform a 'real' stop of that crane in the middle of travel, with deceleration to zero speed ?

I've tried Object.stop() but is stops immediately (no-deceleration) and I need the crane to decelerates to zero speed.

Thanks

Fabio

Software Version:

FlexSim 22.1.3

crane stop object

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Answer 1 · 2022-08-31T08:28:21Z

Jason Lightfoot answered Aug 31 2022 at 8:28 AM Felix Möhlmann commented Sep 06 2022 at 1:00 PM

Pretty sure this is not possible unless you control all the kinematics of travel yourself. You could post it as an Idea, to have a change in speed affect current travel, here on the forum on which people can vote.

· 9

Felix Möhlmann commented · Aug 31 2022 at 10:21 AM

As Jason said, you would have to interrupt the current travel with a preempting task sequence and 'manually' add kinematics to decelerate to a stop.

The attached model shows how this can be done. The stop is triggered by sending a message to the crane (msgparam1 = 0). The process flow reacts to this and interrupts the travel. In the custom code activity, the current velocity of the crane is read from the kinematics. From that the stopping distance is calculated and new kinematics are added.

Another message (msgparam1 = 1) will resume the crane.

crane_decelerationtostop.fsm.pdf

(Rightclick on the file attachment -> Save Link/Target As (might be called differently depending on the browser) -> Set "Save as type" to All Types -> Save with a name ends with .fsm)

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crane-decelerationtostopfsm.pdf (40.9 KiB)

Fabio G10 Felix Möhlmann commented · Aug 31 2022 at 4:13 PM

Excellent Felix ! This approach in your attached model worked for me !

Thank you very much !.

Fabio

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Boris M6 Felix Möhlmann commented · Sep 01 2022 at 2:58 PM

This answer was very helpful. but can i preemt it as a task, so i can stop it properly and the start a travel task directed to the other way directly from this code?

To create a task that has all this steps, the stop, then the travel to the opposite direction

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Felix Möhlmann Boris M6 commented · Sep 01 2022 at 4:02 PM

You can set the preemption setting to abort the active taks. Then, if you know where the crane should travel to next, you can add that travel activity to the process flow.

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1662048110832.png (15.7 KiB)

1662048171360.png (25.4 KiB)

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Fabio G10 commented · Aug 31 2022 at 4:14 PM

Thank you Jason !

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