statics 3d rigid body equilibrium example problems

(like in a revolute joint, where we have M = c*phi, but here in spherical joint we have 2 angles, as I don't want to account intrinsic rotation of cylinder around its axis). All I want is just to make some kind of connection between rods that would produce a counteracting moment that is proportional to change of angles in this joint. The problem here is that here the center of the joint is located in the center of the face and the radius of the joint is 0, so, as I understand, the moment would be 0. I didn't understand is it valid to define the joint between the ground and the top face of the cylinder as is shown on the 2nd picture (and also if I want to create a joint between 2 consecutive rods, I would need to define a joint between the bottom of one cylinder and the top of another). I read about this type of joint and how the friction moment is calculated based on radius, friction coefficient and surfaces of the joint. There is also a problem here with the spherical joints.

Could you please explain it more? Is the structure on the picture appropriate for Static Structural? I actually haven't quite understand your note about 6 springs. All the other joints between rods should be also spherical with non-zero stiffnesses (that's what I meant when I wrote about springs). Briefly, there're 3 rods (on the right side of the picture) that have a spherical joint with the ground. Thanks peteroznewman for your answer! Here I apply the photo of the system I want to model. It would be very nice to get an answer for my question. Solution didn't converge, it has many errors, including 'Not enough constraints appear to be applied to prevent rigid body motion.' That's why I don't know is it possible to to solve static equilibrium problem of rigid body in Structural as it's always trying to prevent rigid body motion. In Static Structural I've also defined Remote Force because the solver said that usual Force can't be applied to rigid body.

Anyway, I don't really know if it is possible to solve static problem in Rigid Dynamics where it's not possible to make a constraint of zero acceleration for example. I tried several times to apply the force from different locations. But I don't know is it ok to define the origin of remote force to be not on the face I want to apply this force to. I tried to apply load to the other lateral face of the cylinder.įirst I've tried Rigid Dynamics analysis but I faced the problem that only Remote Force can be applied to the rod. I tried to do that with 1 horizontal rod (modeled just by solid cylinder) connected to the ground in one of its lateral faces by revolute joint with non-zero rotational stiffness. Masses, materials and radii of rods don't matter because the problem is static. The problem is to find a static equilibrium of this system under the load. The load is constant and shouldn't change direction. There is also a load applied to the end of one of the rods.

Is it possible to find static equlibrium of system of rigid bodies using these types of analysis? In more detail, I want to model a system of rigid rods connected by springs. I have a question about Rigid Dynamics and Static Structural.

Statics 3d rigid body equilibrium example problems