Hello
I am doing a Modal analysis on a structure made up of 3D-Beam4, Mass21 and Shear panel 28. To be more clear, the structure looks like a cube made up of Beam element on all 12 edges with Mass21 element at all corners of the cube and also with shells (shear panel 28) at all six faces of the cube.
I first constructed the beam structure with keypoints and lines, then i added the point masses and meshed them, then i created the shell element using Modelling-create-area and meshed it. Finally i merged them using "NUMMRG, ALL" in the command field.
After solving, the Eigen frequency i obtain is about 0.24271e-5 Hz. But the same problem when solved using ABAQUS gives the Eigenfrequency as 27 Hz which is the correct value.
Somebody please let me know where i went wrong.... Couldn't proceed any futher....
Thanks in advance
Prem
I am doing a Modal analysis on a structure made up of 3D-Beam4, Mass21 and Shear panel 28. To be more clear, the structure looks like a cube made up of Beam element on all 12 edges with Mass21 element at all corners of the cube and also with shells (shear panel 28) at all six faces of the cube.
I first constructed the beam structure with keypoints and lines, then i added the point masses and meshed them, then i created the shell element using Modelling-create-area and meshed it. Finally i merged them using "NUMMRG, ALL" in the command field.
After solving, the Eigen frequency i obtain is about 0.24271e-5 Hz. But the same problem when solved using ABAQUS gives the Eigenfrequency as 27 Hz which is the correct value.
Somebody please let me know where i went wrong.... Couldn't proceed any futher....
Thanks in advance
Prem