July 25, 2019 at 2:56 pmm.caragiuliSubscriber
I'd like to receive your opinion about this topic: how can I apply two sequential remote displacement applied over the same body but with different displacements and point of application of the rotation? Basically I want that the body moves in two steps (or two different times) performing one displacement and one rotation about one point and a displacement and a rotation about another point.
I've tried to use the remote displacement tool creating two remote displacement one applied on a point for the first rotation giving the tabular data for the displacement and the other applied in a second point for the other rotation changing also the coordinates for the dispalcement. However when combining the two displacements the simulation doesn't behaves correctly.
What can I do in order to make these two remote displaments act sequentially? is there a way to realize two successive displacements with rotations around different points?
thank you for your time!
July 25, 2019 at 4:24 pmpeteroznewmanSubscriber
Please insert an image of the geometry, and indicate the two remote points and the axis of rotation.
Are the remote displacements scoped to two separate faces of the body? Show which faces.
Did you deactivate the second remote displacement during step 1?
Did you deactivate the first remote displacement during step 2?
July 25, 2019 at 7:01 pmm.caragiuliSubscriber
Hi Peteroznewman, At the moment I can't post here any image so I will do my best to explain the situation.. I'm simulating the movement of a mandible when I apply these two rototranslations just to see how much is the movement of the mandible. I'm analyzing this movement on the sagittale plane that for me is YZ (Z is vertical, Y is backward) thus the two points have the X coordinate null and the rotation occurs around the X axis. The two remote displacements are scoped to the same face that is the teeth of the mandible. I don't know if it is correct to use two steps and I don't know how to link each other. I didn't deactivate the 2nd remote displacement during step 1 neither the first one during the 2nd displacment. I will try to do it tomorrow. So just to recap I have to insert 2 steps and during the firsy displacment when I set the tabular value for the displacements and the rotation I should start with 0,0,0 for coordinates and 0 for rotation then at step1 I insert the values for my first rototranslatoon and step 2 should be deactivated. Whilst regarding the second remote displacement I start always with 0,0,0 ,0 , then I deactivate step 1 and at step 2 I write the values of my second rototranslation? Exactly the values to be deactivated are the second rototranslation for my first remote displacement and the values of my first rototranslation for the second remote displacement? I hope to be clear.
I've attached the image of the graph so you can observe that the problem occurs at substep 1.1 since the displacement starts from 0,6 while I want that it continues followinf the first displacement. I want a sequential movement, not two separated movements...
Hope to be clear.
Thank you for your kind advises!
July 26, 2019 at 2:48 pmpeteroznewmanSubscriber
Now that you have figured out how to insert an image, please reply with an image of the YZ plane so we can see the two points, labeled #1 and #2, and show the geometry they are attached to. Include information about the displacement of point #1 during step 1. Obviously, point #2 moves during step 1, but you want to apply a displacement of point #2 from where it ended up after step #1. This can be done, I just want to try it out before I say how, to be sure it works.
If you attach your .wbpz file, (File > Archive) after you reply, I can download and work with it. Say in your reply the release of Ansys you are using.
July 26, 2019 at 3:17 pm
July 28, 2019 at 8:29 amm.caragiuliSubscriber
I'm working with Ansys 2019 R1.
the second point is indipendent from the first one.
Please if you have any idea give me a tip or suggest another command to be used..
I can't upload here the file, so all the information is in the images and what I have previously said.
July 29, 2019 at 7:28 pm
July 30, 2019 at 7:16 amm.caragiuliSubscriber
thank you for your answear! I have some doubts about it. Please could you clear me what you mean by dummy body?
is it a rectangle where two corners are my two points around which rotation occurs?
in the details of the general joint there are a lot of settings. I've attached the image just to better understand...
-free means that the body is able to move or rotates along that direction or around that axis, is it right?
-the coordinate system is not the global coordinate system of my jaw, I'm not able to change it..
-apply by remote attachement or direct?
-regarding the body to be attached I should consider once the dumy body and then the teeth of mandible, is it right?
-initial position unchanged?
-stops what does it mean?
Sorry for all these questions, but I hope to receive an answear..what about the remote displacement that I felt more confident about? there is no way to use that command?
Thank you very much!
July 30, 2019 at 11:35 ampeteroznewmanSubscriber
July 30, 2019 at 4:15 pmm.caragiuliSubscriber
first of all I really thank you for your time!
then I've just finished to perform the procedure, I've got the desired movement, but I still have some questions for you and I will be grateful if you could solve these last doubts..
- the first issue involves the construction of the rectangle.. I defined the two points but I didn't manage to create a rectangle by overlapping on the two edges, however I tried to be the more precise as possible to move my rectangle over those points. Then I've created a surface from that sketch and given a minimum thickness otherwise problems occurred. Do you think in this way it can be feasible? How should I have done in the right way?
- Regarding the rototranslations I've specified in the connections the axes along which to move and the rotational axis, however as you can see from the picture it seems that only the first rototranslation occurs..why are the value of D,E and F 0? I noticed that you too got the same result. Moreover I had to define a translation at a time infact I have 6 "joint" in the analysis settings and I set the values of the second rototranslation as second step of course, right?
-to achieve convergence I had to switch to large deflection maybe because the mandible is flexible (since I need the symmetry condition). is this an error?
-To conclude the tabular data near the graph of the total deformation show three columns minimum , maximum and average, what do they mean? is that the minimum, maximum and average displacement? if yes, according to which reference system have they been computed? because to define the two general joints I set two coordinate system over the vertices of the rectangle which are oriented according to the my global reference system.
Thank you for your help! I really appreaciated!
Have a good day!
July 30, 2019 at 5:03 pmpeteroznewmanSubscriber
July 31, 2019 at 10:23 amm.caragiuliSubscriber
Thanks for your tips!!
Just to be sure.. The dummy body can be any size as you said and it is related to the joint through the coordinate system which in turns can have the origin elsewhere even outside the dummy body, as in the picture, right? Then by selecting a vertex or face or edge as a scope to the dummy body everyting becomes connected, right?
Moreover this rototranslations are simultaneous? I mean rotation and traslation occur together or there is first a rotation and then a translation?
To conclude regarding the method using the remote displacement I've read that by using the APDL command D, node, %_FIX%in the preprocessing it is possibile to make the first step rototranslation values permanent during the displacement allowing the successive displacement to start from these last values, but I'm not able to let the displacement continue since the first rototranslation values keep constant along the first rototranslation values neglecting the second input, maybe another constraint would be necessary.
This was just to let you know what I've read in the net. If you are able to deep dive in this I would be interested in understanding. However I'm satisfied of the results thanks to your suggestions thus I'll thank you one more time!
Have a nice day!
July 31, 2019 at 2:10 pmpeteroznewmanSubscriber
July 31, 2019 at 2:45 pmm.caragiuliSubscriber
Thank you very much for your help!!! You solved my problem!
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