analysis fem tree motor

[Magggiko]

Hi guys! For an exam I have to present a structural analysis project to the finished elements with ansys. I chose to use a motor shaft, very simple of a 50cc. as element type I chose brick, but then I realized that it has no rotation in degrees of freedom. I dissected the tree axially, ie split it in half (because it is not asymmetrical) and put a force along the section that encloses the biella pin. How do I make him realize that he doesn't have to turn the other end? ?
(maybe the question is a little stupid, but I'm at first arms, forgive me)

 

[Matteo]

Hi guys! For an exam I have to present a structural analysis project to the finished elements with ansys. I chose to use a motor shaft, very simple of a 50cc. as element type I chose brick, but then I realized that it has no rotation in degrees of freedom. I dissected the tree axially, ie split it in half (because it is not asymmetrical) and put a force along the section that encloses the biella pin. How do I make him realize that he doesn't have to turn the other end? ?
(maybe the question is a little stupid, but I'm at first arms, forgive me)

there are unclear points in the question, in particular: if geometry is not asymmetrical, why did you dissect it (I suppose to exploit symmetry)? an image can help. Hi.

 

[Magggiko]

ok excuse!to words in fact is not very simple.it is to you the image.
However, I can also do everything complete but the problem remains.

 

[cesius79]

I am also learning the fem but I already have a question: symmetry can not exploit it for geometry or for forces...and then why do you divide it?(as has already reported matteo)

 

[Magggiko]

bèh actually for the forces why can't I use it? ? the other half of the tree behaves in the same way and then even if it does not change the symmetry the problem also arises, how easy to make him understand that there is a torque moment? ?

 

[cesius79]

because in the crankshaft the forces are arranged in a different way on the cylinders...in a staggered and not symmetrical...it returns? and also the reactions on the bearings so to the eye should not be the same...for the torque moment in workbench there is the command on purpose but now as I can not tell you.. If you have patience tomorrow I can say...in any case to not read or write
Hi.
p.s. I realized now that it is a monocylinder....in any case I do not think it is correct to use symmetry if geometry is not...just excuse, but what tpo of analysis do,dynamic?static? I remember that I probably know less than you though maybe discussing it can help you better understand the problem

 

[Onda]

From my point of view, you should shape it whole.
put a bearing type bond (I do not use wb and do not know if this is its correct name) at the two ends of the tree. at one of these ends bind it also axially.
put an axial bond on one of the two sides of the stick that transmits the bike. In this way, you bind your motor shaft to rotation, downloading all the load on the key, as well as in reality.
put the load to the point.
by binding it in this way you should go close enough to reality.
wave