Re: [Yade-users] [Question #580450]: Applying differents force values
Question #580450 on Yade changed:
https://answers.launchpad.net/yade/+question/580450
Jan Stránský posted a new comment:
O.foeces.permF(int), so both O.forces.permF(540) and
O.forces.permF(upBox.id) are correct, O.forces.permF(O.bodies[540])
would give you some error
once you have the value, you can do whatever you want with it, the most
Yade-like approach would be to use plot module
#
def plotAddData():
plot.addData(
i = O.iter,
f540 = someValueGotWithPermF,
)
# plot.saveDataTxt(fileName) # save it periodically
O.engines = [
...
plot.adddata(iterPeriod=..., command="plotAddData()"),
]
...
# saveDataTxt(fileName) # after simulation ends
Or you can save the value to a text file:
with open(fileName,'a') as f:
f.write("{}\n".format(someValue))
Have a look at Yade doc and Python doc or write here or open new
question if something is not clear
cheers
Jan
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Re: [Yade-users] [Question #580450]: Applying differents force values
Question #580450 on Yade changed: https://answers.launchpad.net/yade/+question/580450 Status: Answered => Solved Felipe confirmed that the question is solved: Thanks Jan Stránský, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #580450]: Applying differents force values
Question #580450 on Yade changed: https://answers.launchpad.net/yade/+question/580450 Felipe posted a new comment: Hello Jan, Really sorry for my response delay. I guess what you are saying about reading force. You are totally right. Just one point, how can i use the command O.forces.permF(someId) that you have mentioned? O.forces.permF(540) or O.forces.permF(upBox.id) or O.forces.permF(O.bodies[540]). Also, you said i can use this command to get prescribed force and SAVE IT. How does it works? Thanks. Felipe -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #580450]: Applying differents force values
Question #580450 on Yade changed: https://answers.launchpad.net/yade/+question/580450 Status: Open => Answered Jan Stránský proposed the following answer: Hi Felipe, thanks for the complete scripts. I have tried them and did not find anything wrong. Just to summarize: > I have found divergences when i have apply the force on the surface and then > I read the value that i recorded. > When I read the force, I noticed that the applied values were different from > 200. it is simply because read force and applied force are intrinsically different values, see my previous comments (you don't read the applied (=prescribed) force, you read total force applied on the body (=prescribed force+forces from interactions) > is it the correct way to apply the force on the surface? How can i be sure that i really applied the force value on the surface? yes, it is the correct way. You can be sure because you used the command :-) You can also use O.forces.permF(someId) to check if a perment force is set on body with id=someId (you can use this command to get prescribed force and save it, maybe this is what you wanted from the ForceRecorder?). cheers Jan -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #580450]: Applying differents force values
Question #580450 on Yade changed: https://answers.launchpad.net/yade/+question/580450 Felipe gave more information on the question: Hello Jan, As you have requested me, i am sharing the full script on the link. https://www.dropbox.com/s/ykyva1ywy01iaxs/caixa_inferior_100mm_ascii.stl?dl=0 https://www.dropbox.com/s/aasvk3umptt4fk2/caixa_superior_100mm_ascii.stl?dl=0 https://www.dropbox.com/s/2xgx3iut15frqbm/script.py?dl=0 Let me know if i need to provide anything more. cheers, felipe -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #580450]: Applying differents force values
Question #580450 on Yade changed: https://answers.launchpad.net/yade/+question/580450 Jan Stránský posted a new comment: Hi Felipe, thanks for more info. However, it is still not complete :-) could you please create a complete script that records the force and saves the data? >From the script it is clear, that force 200 is applied correctly. The rest >depends on "read the force". Just guessing, O.forces.f returns total force on body, i.e. applied force PLUS forces from interactions. In the case of static equlibrium, it returns zero. cheers Jan -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #580450]: Applying differents force values
Question #580450 on Yade changed: https://answers.launchpad.net/yade/+question/580450 Status: Answered => Open Felipe is still having a problem: Hello Jan, I guess the correct way in MWE to ask this question. Below, you can see the short script that i am using to apply the force. # Yade 1.20 - Ubuntu 16.04 LTS upBox = box( center=(0,210,0), extents=(35,1,35) ,fixed=True,wire=False,material='peso') p1=O.bodies.append([upBox]) sp=pack.SpherePack() sp.makeCloud((-35,-45,-35),(35,200,35),rMean=5,periodic=False,porosity=0.8,distributeMass=False,seed=0) sp.toSimulation() upBox = O.bodies[540] O.forces.addF(upBox.id,(0,-2e2,0), permanent=True) upBox.dynamic = True upBox.state.mass = 10 upBox.state.inertia =(20,20,1) upBox.state.blockedDOFs = 'xzXYZ' I was hoping to apply a force value of 200 the spheres to compress and also this constant force. When I read the force, I noticed that the applied values were different from 200. How should I apply force to keep the determined value constant and when reading the body to plot on the graph does the force value find exactly the value that was applied? The results that were found is on the link. https://www.dropbox.com/s/9rpfigjaqfy3171/Normal_force2.dat?dl=0 https://www.dropbox.com/s/7u4jlfo1nv4gd1r/Normal_force.dat?dl=0 thanks. felipe -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #580450]: Applying differents force values
Question #580450 on Yade changed: https://answers.launchpad.net/yade/+question/580450 Status: Open => Answered Jan Stránský proposed the following answer: Hi Felipe, in such situations, please provide a MWE [1] such that we can test the problem, new we can only guess what the problem is. The applied force is just one part of recorded (total) force on the body, there are also forces from interactions.. May this be the "problem"? cheers Jan [1] https://yade-dem.org/wiki/Howtoask -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #580450]: Applying differents force values
New question #580450 on Yade: https://answers.launchpad.net/yade/+question/580450 Hello guys, I have found divergences when i have apply the force on the surface and then I read the value that i recorded. I am applying four different forces (10N, 20N, 50N and 100N). To do it, i am using the script below: upBox = O.bodies[540] #identify the body O.forces.addF(upBox.id,(0,-2e1,0), permanent=True) #force value = 20N upBox.dynamic = True upBox.state.mass = 10 upBox.state.inertia =(20,20,1) upBox.state.blockedDOFs = 'xzXYZ' #block displacement is it the correct way to apply the force on the surface? How can i be sure that i really applied the force value on the surface? thanks for advance. cheers, felipe -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
