impulse response
hello I tried to obtain cantilever beam transient response to force - time curve, was given in attachment (finite element model also was given in attachment)
however I cannot obtain true displacement and acceleration response is zero
what is my mistake?
can you give any suggestion?
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Answers
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Hi,
Make the following changes to the table and try again:
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my purpose is to obtain time response according to force history via numerical analysis is it possible? or how to perform it ?
<?xml version="1.0" encoding="UTF-8"?>
also, I made changes you offered but I did not obtain any displacement
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Sorry for a late reply.
You cannot use structural damping as it is for transient analysis. This has to be converted to viscous damping.
Use PARAM>>W3 to convert structural damping to viscous.
Please refer to OptiStruct help on how calculate W3
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ok, thnks for reply
namelyI cannot obtain this response when I apply force as above is true?
I cannot get damped free vibration response as above when I apply impulse force (as impact hammer) OK?
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What you see is absolute value and not a real value. Instead run modal transient analysis with TABLEDAMP and use ENFMOTN= REAL which converts absolute to real values.
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mr pagadala, I clearly explain what I want;
I perform vibration test with impact hammer and accelerometers on laminate composite beam and plate specimens and I obtain time response (like damped free vibration response - as a attachment)
I want to perform simulate this problem with optistruct and I obtain the response how to perform??
I want to learn step by step required procedure
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PFA
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thanks for reply, I m sorry for thank
when I investigated your model in TABLED1 Load Collector for exciting function you used different function however I search impuls function
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mr pagadala
I Wanna chat with you I need this because this is important
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Yes that is because the loading history in your table violates the tableD1 rules.
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mr pagadala thank for all supply
modelld file is here in attachment
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I think the model setup is fine. This is the what you are looking for right...?
<?xml version="1.0" encoding="UTF-8"?>
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yes no problem I wanted only share model file
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