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Hello,
Looking for some help modeling an open pulley system using mechanisms. We have a door that is opened and closed via an linear actuator and a pully system. We want to model the pulley system accurately as it goes around the pullies to better understand chain length and actuator location.
Big question is can you do this type of constraining in creo? No sure how to have the chain route around the pullies as the contact location will change as the door opens and closes.
Any help would be great!
Using creo 8.0
Solved! Go to Solution.
I was able to get this system to actuate using only the 3D contact connections in Creo Mechanisms (as well as a linear and rotary motor). I did not try the CAM/follower with lift off. The hardest part was pre positioning the chain using the drag tool. Because there are so many pin connections it was tremendously inefficient. I cut a big section out of the chain in hopes of speeding up the process. Anyway the biggest challenge was to "tension" the chain. There is no tool to do effectively other than the drag tool. As you can see the chain tends to wander and kink.
The simulation may have benefited from some gravity physics but I do not have that license. Anyway I was able to functionally simulate it, but as far as analysis wise not sure what I can get out of this. \
I think it may have benefited me to assembly the chain in place in the closed position and then run a kinematic analysis to move the system to the open position. It seems the "run analysis" works better at calculating the position/rotation of all elements better then then the drag tool. Once you are in the end state of the analysis you can capture that as a snapshot and return to that state for further analysis.
Here is a simple example, but even this analysis is quite complex 😂
Thanks Skunks.
I see what you did but couldn't seem to actuate it correctly. The cam/follower with lift off enabled may be the correct way to deal with the transient connection between the rope/chain and the pully. But the chain/rope physics seems like it may be too much for creo to handle. I will keep working it. If you figure it out please repost!
Thank you!
Oh yes, my example is very, very simple 😂😂
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I was able to get this system to actuate using only the 3D contact connections in Creo Mechanisms (as well as a linear and rotary motor). I did not try the CAM/follower with lift off. The hardest part was pre positioning the chain using the drag tool. Because there are so many pin connections it was tremendously inefficient. I cut a big section out of the chain in hopes of speeding up the process. Anyway the biggest challenge was to "tension" the chain. There is no tool to do effectively other than the drag tool. As you can see the chain tends to wander and kink.
The simulation may have benefited from some gravity physics but I do not have that license. Anyway I was able to functionally simulate it, but as far as analysis wise not sure what I can get out of this. \
I think it may have benefited me to assembly the chain in place in the closed position and then run a kinematic analysis to move the system to the open position. It seems the "run analysis" works better at calculating the position/rotation of all elements better then then the drag tool. Once you are in the end state of the analysis you can capture that as a snapshot and return to that state for further analysis.
"...Anyway the biggest challenge was to "tension" the chain..."
Yes, you are right, the license MECHANISM DYNAMICS (MDO) is required 🤔