![]() ![]() 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. Thus, we identify three forces acting on the body (the car), and we can draw a free-body diagram for the extended rigid body, as shown in Figure.įigure 12.I have a question about Rigid Dynamics and Static Structural. Since the laws of physics are identical for all inertial reference frames, in an inertial frame of reference, there is no distinction between static equilibrium and equilibrium.Īccording to Newton’s second law of motion, the linear acceleration of a rigid body is caused by a net force acting on it, or Because the motion is relative, what is in static equilibrium to us is in dynamic equilibrium to the moving observer, and vice versa. ![]() Notice that the distinction between the state of rest and a state of uniform motion is artificial-that is, an object may be at rest in our selected frame of reference, yet to an observer moving at constant velocity relative to our frame, the same object appears to be in uniform motion with constant velocity. We say that a rigid body is in static equilibrium when it is at rest in our selected frame of reference. This means that a body in equilibrium can be moving, but if so, its linear and angular velocities must be constant. We say that a rigid body is in equilibrium when both its linear and angular acceleration are zero relative to an inertial frame of reference. Explain how the conditions for equilibrium allow us to solve statics problems.Draw a free-body diagram for a rigid body acted on by forces.Identify the physical conditions of static equilibrium.By the end of this section, you will be able to: ![]()
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