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Hi John,
I tried to follow your suggestions, but I still can't obtain a good model.
In the .ach file you'll see a simplified model.
In reality the bottom cylinders have a translational movement in y-axis
and they can idle rotate.
The top cylinder is the driven one, is fixed in y-axis and gives the
translational movement to the sheet metal thanks to friction contact.
I tried to use contact between beams and bricks as you'll see, but
beams can't keep the cylinder fixed.
Thanks for your support.
Angelo
Angelo,
The top cylinder was missing boundary conditions, so it was free to move. I have added the boundary conditions in the attached archive.
I made some other changes just to optimize the model and speed up the runtime. Naturally, you may need to make further changes to simulate the reality. The changes I made include:
P.S. Change the extension of the attached file from .zip to .ach, and then open it with Algor.
John Holtz
Product Design Engineer, Algor Simulation
Autodesk, Inc.
Hi John,
I appreciate your suggestions really much, but I need your help again.
In the reality, the metal sheet isn't either pulled or pushed.
The top cylinder has the spin motion (for example 10 RPM) and the metal
sheet advances by friction.
How can I assign this movement to the part?
Angelo
You are 95% of the way there Angelo!
First, change the element type of part 5 from Truss to Beam, and enter the Element Definition data for the beams.
Second, add a prescribe displacement (PD) to one end of the top roll where the boundary condition is. On the PD dialog, set it to be a rotation instead of a translation, and enter the rest of the input as normal. The magnitude can be handled in any number of different ways -- it just depends on how you think. I prefer to enter a magnitude of 1 revolution. Then, the load curve is used to create the rotational speed (in rev/second in your setup). For example, 10 revs in 5 seconds is 2 rev/sec = 120 RPM.
Depending on the real situation, you could add a PD to the opposite end of the roll, too.
John,
finally the top cylinder is rotating.
Thanks a lot for your suggestions!
John,
I was having a similar problem and so i read through ur suggestions. In this model, i see that you did put the boundary conditions for the top cylinder. When i saw the model the spokes were connected from all the surface nodes of the side of a cylinder to a point(centroid) outside the model- how did you create this point outside. When i try to do this all the spokes are coonecting to the center of the side surface and not at a distant point like you did. Please help
Hi,
There are a number of commands that could have been used. The "Mesh > CAD Additions > Joint", or "Setup > Loads > Remote Loads" will create similar structures. I probably used the "Draw > Modify > Point Move" to move the node outside of the model just for clarity. As long as the two boundary conditions are on the centerline, it doesn't make much of a difference where they are along the length.
Hi,
Several of my comments on your model:
1.) please check-on "large rigid body rotation" for part 2 in element definition -> advanced;
2.) Rotate 60 revolutions. Is this necessary? Results might be floating away due to long-period numerical error accumulations. You have to be very careful on this.
Your model is simulating a kind of light flexible structures. The dynamic response is very complicated. I can see this in simulation results, even without fluid-structure interaction (FSI).
I understand now. I was not using a real scenario for rotation, i understand that 60 is too high- i changed to 5 and now running fine and quick. My next question is how do i put water inside this drum and then rotate again. Are fluids possible in MES, how to achieve this. Please help me out with this. Thanks
The answer about the water in the drum depends on what effects you are hoping to capture.
Let us know how it goes and when the clothes are clean
I created the part but am sure how to put the material as water as it does not have an option in MES for me to put water as a material...sorry if i am missing something
Also my other question was- suppose i apply some surface temperature to outside of the drum and put some temperature to inside the drum liquid. I want to calculate the resultant final temepratures of water as well as drum outside surface, but i dont see anything related to temperature related in MES analysis results. Is this possible ? Sorry am a newbie with this software, so am not sure its capabilities. Thanks
Please see the attached model. Part 3 is water and Part 4 is the container.
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