shock absorber

[Garrett]

Bye to all,


I have a problem with dynamic simulation of a shock absorber, this is the design


I've been looking for some tutorials around that could help me but I couldn't get over it, I bet it's stupid for you.

I have this shock absorber and I would like to do 2 things:

1) by applying a force from below or from above I would like to make the spring compress and then slide the stem

2) at the 2 extremes of the shock absorber there are 2 spherical uniballs, I would limit the ability to excursion of this uniform and make sure that when the bushing collides with the body of the shock absorber the ball stops and does not go any further (if you are not well understood what I intend to tell me)

I have placed the following constraints:

the bottom unball is bound pin/hole with the stem

plates supporting the spring on the 2 sides are also bound for pin/hole, one with the stem and one with the body of the shock absorber

the stem is bound to coincide between its axis and body axis of the shock absorber, in fact it is free to flow


fixed these constraints went on dynamic simulation, I positioned a f force from the bottom up and I launched the simulation, but nothing moves.

Where is the huge mistake that definitely exists in all this?

 

[diegus]

then, first of all in dynamic simulation environment you do not need to draw the spring, there is the special joint that creates it with its rigidity characteristics. then first eliminates the spring. As for the uniballs you have to bind with a coincidence between the center of the ball and the center of the spherical seat on the body of the shock absorber. These spheres in turn must be bound by pivot/hole to the structures to be suspended (e.g. fork/frame). then to limit the rotation of the spheres within the seat, so as to recreate the behavior of the rotula, insert a contact joint 3d. Last thing, in the axieme you do not have the bond that imposes the distance between the two uniballs (the piston must be free to scroll you must always leave the degree of freedom desired).

 

[Garrett]

Thank you very much for the answer, as soon as I can try to do as you say and then I tell you.

 

[Garrett]

All right, thank you very much.