Frequency Response Analysis
Hi, I must perfom a Frequency Response Analysis.
In particular i've a pressurized cylinder subject to a Impulse load with frequency of 1 Hz and magnitude 0 - 3000 psi - 0 (sin function load).
i want the response on first 5 natural modal frequency.
how i must set the analysis ?
Thank you
Answers
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Hi @Fabiano.Pagliarini Here is a sample tutorial for Modal frequency analysis. This should help you to model FRF deck.
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Altair Forum User said:
Hi @Prakash Pagadala. I know this tutorial.
I ve 2 problems:
1) I want to apply a unifom pressure on a surfarce with about 30000 nodes (my model is similar to a pressurized cylinder) in normal direction . Is it possible this thing in DAREA card?
2) How can I apply my semi-sin load (0 - 3000 psi - 0 @ 1 Hz) on TABLED1?
Thank you
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yes you can use pressure as load type which can be refereed in RLOAD# card.
I am trying to understand the loading. SO is it like at 0Hz the load is zero, at 1 it is 3000 and at 1 it is again zero?
If the above is correct then it cannot be a sine wave. Can you provide the right curve values.
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Prakash Pagadala,
the load spectrum in time domain is:
0 psi @ t=0 sec;
3000 psi @ t=1 sec;
0 psi @ t=2 sec.
What I put on TABLED1 and DAREA?In DAREA, i can not allocate the pressure (3000 psi) in right way, because there isn't the possibility (i'm not expert in dynamic analyzes !)
to assign a pressure on a cylindrical coord system (in radial direction) or normal to sufaces.is it possible to use a generic PLOAD4 to assign this pressure and refer it on RLOAD card?
Thank's for your support.
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You can use PLOAD4 in RLOAD. RLOAD is supports PLOADx as excited load. You can give PLOAD as 1 and provide the 3000 factor in tabled1
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thank you @Prakash Pagadala
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No Problem. Please let us know if you face any road blocks during the simulation and we will do our best to help you out
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