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Moving force, mass and oscillator

Moving force, mass and oscillator

Moving force, mass and oscillator

(OP)
Dear Experts

I'm modeling moving force, mass and oscillator on a beam and attach the CAE file for my model (a case for moving oscillation).

My model is composed of a 2D wire beam and two 2D reference points.

One reference point (point 1) slides on the beam surface (node to surface interaction).

The other point (point 2) is connected with spring elements.

Here are my modeling strategies.

Case 1: Moving force: apply concentrated force (= vehicle mass * gravity) to the point 1, mass of point 1 is zero, delete spring and point 2, slide point 1 from end to end with time step.

Case 2: Moving mass: apply concentrated force (= vehicle mass * gravity) to the point 1, apply vehicle mass on the point 1, , delete spring and point 2, slide point 1 from end to end with time step.

Case 3: Moving oscillator: apply concentrated force (= vehicle mass * gravity) to the point 1, k is a real spring stiffness value, mass of point 2 is vehicle mass, mass of point 1 is zero, slide points 1 and 2 from end to end with time step.

Do you have any comments on the above models?

One more thing, I'm going to compare those results with theoretical results. In the case 1, the displacement of beam is exactly matched with the theoretical model (closed form solution). However, the acceleration that I got from abaqus output looks odds. It is not acceleration that is a second derivative of the displacement. Do you have any idea on this?

Thank you for reading and please comments on them.

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