Calculate Tube Uncoiler Reel Acceleration | P-J

AI Thread Summary
The discussion revolves around calculating the acceleration of a tube uncoiler reel during an intermittent process where the uncoiler accelerates due to a pulling force (F1). The user clarifies that the uncoiler does not operate in a steady state and that a pneumatic brake is not applied during the acceleration phase. Participants inquire about the mechanisms that prevent the reel from spinning freely, such as reel inertia and friction. The user seeks to confirm the relationship between the accelerations of the reel and dancer roll, proposing the equation a1 = a3 + a2. The conversation emphasizes understanding the dynamics of the uncoiling process to accurately calculate the required acceleration.
Pieter-Jan De Loore
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Hello,
I'm making a tube uncoiler and I'm trying to find the acceleration of the tube at the reel (a3) can someone help me with this.

acceleration.PNG

kind regards,
P-J
 
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Not immediately obvious why there would be any acceleration with the uncoiler running steady state .

You'll have to explain a bit more about how this uncoiler works so that we can understand more clearly what your problem is .
 
Nidum said:
Not immediately obvious why there would be any acceleration with the uncoiler running steady state .

You'll have to explain a bit more about how this uncoiler works so that we can understand more clearly what your problem is .
Hello Nidum,

Thank you for your response. Sorry for the bad explenation.

This uncoiler is not a steady state process. The uncoiler stands still and gets accelerated for a certain time because of F1 pulling the tube.
During this period, the dancerrol will move with acc. a2.
I'm trying to figure out what the acceleration of the reel is during the acceleration of the uncoiling process.
I hope this helps?
 
OK . It is an intermittent process . I've seen similar equipment in use .

There must be something that stops the reel from just spinning freely . Is this the reel inertia and natural friction or is there some positive retarding mechanism such as a friction brake or a brake motor ?
 
Nidum said:
OK . It is an intermittent process . I've seen similar equipment in use .

There must be something that stops the reel from just spinning freely . Is this the reel inertia and natural friction or is there some positive retarding mechanism such as a friction brake or a brake motor ?
yes I use a pneumatic brake, but during the acceleration time I don't use the brake. The force F1 is to accelerate the the inertia (reel+(dancerrol)?). You can assume there is no friction.
 
Is it correct to say that a1=a3+a2?
 
upload_2017-2-12_20-6-20.png

https://scontent-bru2-1.xx.fbcdn.net/v/t34.0-12/16730050_1445025058841271_1442485757_n.png?oh=2099815ac924837c5a74a25648495c00&oe=58A26271
 

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