How can i simulate that the construction is getting lifted in robot. The construction i have build is going to be lifted onto an oil rig. how do i simulate this in robot?
Solved! Go to Solution.
Solved by Rafacascudo. Go to Solution.
Solved by Rafal.Gaweda. Go to Solution.
Solved by tony.ridley. Go to Solution.
Some weak springs estabilizing supports on the right places were enough to get good results
Also changed the analysis type in the cross beam model from Large displacements to regular linear analysis.
models attached.
If your crane is tall enough ,on the cross beam model , the best place would be lifting from the beam extremes not in the middle portion of it. It is causing high bending moments on it
Rafael Medeiros
Robot Structural Analysis
Thank you so much for your helps 🙂
Now I am going to compare different lifting configuration. I am going to compare story drift of each configuration together as one of the important parameter causing to out of tolerance during module installation. What is your opinion? What type of parameters during lifting process can lead to out of tolerance issue during installation causing to rework? Thanks again for your comments
Hard to tell .This depends on each country code. Each one has its rules. But of course in all of them ,the structure has to be checked OK regarding the forces that appear during the lifting process.
Rafael Medeiros
Robot Structural Analysis
Thanks for your comments.
I think that it can be more interesting if I can simulate the module dynamic behavior during transportation. For this purpose, I have to model the truck floor underneath the individual module as well as its support conditions during transportation. Then I must shake the truck floor during transportation using random floor vibration to see how much transportation loads will affect on module structural properties.
For the first step, could u please tell me how I can model a truck floor underneath a module as well as its support condition? Thank u so much
Rafael Medeiros
Robot Structural Analysis
You may also consider use of these types of loads:
If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.
Thanx dear Artur. I will use them and ask you if I have any question. Thanx again
Hi,
@Artur.Kosakowski wrote on MESSAGE 59:
I have made a test model and tried to iterate the position of the support till the moment the values of bending moments is small enough to be neglected. Basically I started with step a and then I adjusted the support position moving it according to the values obtained from the reactions:
x movement = MY / FZ
y movement = MX/ FZ
Is it x or X? Is it MY or My? Is it MX or Mz?
Here's a link to @Artur.Kosakowski 's message:
Any help would be highly appreciated.
Answer regards adjusting support node position in attached models steps.zip.
MZ and MY , FZ are reactions (in node 5) , while x and y are support node position correction distance. Both (reactions and distance corrections) are calculated in global system of coordinates (X,Y,Z)
Thanks for your reply.
I made an excel sheet for the reactions MY, MX, and FZ.
I calculated the corrections for positions of node 5 according to the reactions.
It seems that @Artur.Kosakowski subtracted x eccentricity for each iteration while he added the y eccentricity. How he came to this?
To avoid signs analysis in respect to global axes direction(which is of course possible) I would use 2 iterations with +and - sign for calculated offset, then I would apply this sign which reduces reaction moment.
Similar effect can be obtained by adjusting node 5 X and Y coordinates to structure center of gravity available in Analysis >Calculation notes>Full or Simplified note (in few iterations).
Refer to