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Abaqus frequencies

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999martyna

Civil/Environmental
Joined
Oct 11, 2015
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1
Location
US
Hi,

I have some problems with calculations in Abaqus. I am trying to calculate free vibrations. I consider plate ( section - shell), simply supported plate. I want to check the impact of forces subjected in the edge of the plate (graph2) on first four frequencies mode (graph 2). Unfortunetaley, if I change the value of the force it doesnt show any change in the result of mentioned frequencies. I don't know how can I change the options in Abaqus to obain expected results. Any your help would be extremely appretiated.

Best regards,
Martyna
 
 http://files.engineering.com/getfile.aspx?folder=8ea917b1-8a5f-4461-b4b3-827f8c13c2f4&file=graph_2.jpg
Hi Martyna,

Please correct me if I misinterpreted your attached picture. But it seems to me that you are applying loads to edges that - through boundary conditions - are not allowed to deform. Maybe you could move the loads to just inside the edge of the slab, or change the boundary conditions?

I also have to ask, just out of curiosity: Are you expecting the natural frequencies to change? Is the idea that normal forces would change the stiffness of the system?

Good luck!
Martin
 
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