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Matteo

Non-linear modal analysis

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Hi everyone,

 

I am currently trying to perform a modal analysis of a component AFTER it has been loaded with a force. During the loading step, some parts of the component engage in SLIDE type contact. 

I use OPTISTRUCT.
I currently plan to make two loadsteps for the analysis:

1.A non-linear quasistatic step during which I load my model and contacts are engaged

2.A normal modes analysis which should compute the modes for the deformed structure obtained after step1

 

Is this possible in Optistruct?

 

Thanks in advance for any answer.

 

Regards

Matteo

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Hi @Matteo

 

Please use STASUB (PRELOAD) in Normal modes subcase which should reference the NLSTAT subcase. 

 

I think this should help.

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On 3/15/2018 at 2:03 PM, Prakash Pagadala said:

Hi @Matteo

 

Please use STASUB (PRELOAD) in Normal modes subcase which should reference the NLSTAT subcase. 

 

I think this should help.

Hi  @Prakash Pagadala

I am trying this but it comes with error "Case Control data LOAD=3 is not referenced by any bulk data relevant for used subcase type." I have attached files for your reference. Kindly help with this.

 

 

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32 minutes ago, Karthic said:

Hi Nachiket,

Try removing the dummy load referred by the static load case. else provide the load for the load collector 3.

Hi Kathic

I already resolved it. Thanks anyways!!

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On 6/23/2018 at 10:07 AM, Nachiket Kadu said:

Sorry!! Couldnt see the obvious mistake there. Issue is resolved. :)

;) 

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