Learning Forum

[GASCLAUDIO]

Hi, i'm trying to understand how the function 'remote displacement' works.

I've seen a lot of tutorial online but i don't get the logic.

If, for example, i put a remote displacement like this:

[peteroznewman]

Deformable remote displacement does averaging. The average nodal displacement of all the nodes on the yellow faces in the Y coordinate direction is zero.nYou can't leave Y Free because then it can be anywhere and Weak Springs were added to the model so it will solve.n

[GASCLAUDIO]

Thanks for your reply nI understand the first part (averaging and Y blocking), but I don't get the Weak Springs one, how do they work?n Anyway, what is the physical interpretation of this remote displacement?nI think the purpose is to keep the center of the shutter where it is in Y direction, in order to mantain it aligned.nThanks again for your support.n

[peteroznewman]

Yes, on average, those surfaces will not move in the Y direction.nA Static Structural analysis is trying to solve {F} = [K]{X} but if [K] = 0 then there is no solution. That is what happens when you leave Y free. Weak springs create a non-zero [K] so that it can calculate a solution, but it is not a useful one.n

[GASCLAUDIO]

Thanks again,i really appreciate your answers.nNow i think i've understood what the program does.nAnyway i think that is reasonable to consider that the center remains where it is because of the simmetry of the geometry (the original center of mass of the shutter, before some semplifications, was almost '0' in Y direction) and for the symmetric loads and the symmetric space that the shutter has to expand in Y direction.nThanks again! n