Applied Acceleration At Boundary Condition

[LS_SMS]

Folks, I'm using Workbench v2023 to run a Static Structural FEA simulation. I have a simple model and want to apply an acceleration to the model. However, I want the acceleration applied to the boundary condition of the model, instead of the default, which is applying the acceleration to the center of gravity of the model. For example, suppose I was testing a lamp post in a lab on an acceleration test table. I would bolt the base of the lamp post to the test table and turn on the machine. The applied acceleration would go through the lamp post's boundary condition at the base. I want to do something like this in ANSYS, but my understanding is that applied accelerations act through the center of gravity of the model.

 

[Stick.]

I might be wrong, but I don't believe that the acceleration is applied to any specific location (at least since you're asking about a static analysis), whether the center of gravity, or a particular surface.

But since I might be wrong, you might want to run a test case to check this. Since you're basically talking about a cantilevered beam here, you could just hand calculate a cantilevered beam with a distributed load derived from F=m*a for your beam (make it easy on yourself and use a constant cross section beam for a test so your load is uniform). That would be easy to model in Ansys as a beam with a fixed BC at the base and an acceleration to match your hand calc. The results should line up pretty well I'd think.

 

[dgeesaman]

Is it a constant acceleration? If so, apply a force. You'll have to remove some boundary conditions for it to have effect.

The only global acceleration that I've worked with is gravitational, which acts on all elements simultaneously.