{"id":340155,"date":"2023-12-20T09:27:37","date_gmt":"2023-12-20T09:27:37","guid":{"rendered":"\/forum\/forums\/topic\/response-of-a-system-to-an-excitation-on-its-frame\/"},"modified":"2023-12-21T10:19:47","modified_gmt":"2023-12-21T10:19:47","slug":"response-of-a-system-to-an-excitation-on-its-frame","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/response-of-a-system-to-an-excitation-on-its-frame\/","title":{"rendered":"Response of a system to an excitation on the frame"},"content":{"rendered":"

I have an experimental rig with beam-mass system attached to a frame. The ends of the beam are fixed to the frame. I have modelled the system in workbench as shown. I need to simulate situation where a force is applied on the bottom of the frame in Y direction with an impact hammer. I need to find the response of the beam-mass system to this excitation. The frame is free to move in the Y direction. I  tried to model this system using an impulse force in transient analysis.<\/p>\n

Analysis settings:<\/p>\n

3 step analysis with time step 1e-3 (natural frequency is around 25Hz)<\/p>\n

To be more clear, the frame is free to move in Y direction, the applied force on the frame creates a motion in the y direction. This motion should result in the vibration of the beam and mass attached to the frame. Which boundary condition should i give in this case for the frame? I tried restricting the motion in x and z directions, but the analysis fails with the error of insufficient bc and rigid body motion.  <\/p>\n

I just tried fixing the left and right sides of the frame to see if there is any response, but there is no motion of the beam and mass(displacement probe attached below).<\/p>\n

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