Response spectrum Nastran IN - CAD

[rgruychev]

Please show me example or advice for Response Spectrum analysis.

Aboute this http://www.autodesk.com/products/nastran-in-cad/compare it is possible.

How to make ?

Example missing in tutorial.

[david_cordova]

We don't currently have a tutorial but you can find information on response spectrum generation and application in chapter 6 of the Nastran User's Manual.  To access it, go to:

Start > All Programs > Autodesk > Autodesk Nastran 2015 > Documentation > Autodesk Nastran User's Manual

[Anonymous]

Dear David,

On this time I'm performing a dynamic analysis by the response spectrum methodology. About the chapter that you mentioned, could you give which are the points specifically where is described the use of the spectrum response. Could you give a little tutorial on some points, about how to define the curve in Nastran? I'm interesting in something like this (but in Nastran in CAD):

https://www.youtube.com/watch?v=UYsisjqOaiI

Regards,

JJJJ

[Anonymous]

Dear Mr. Cordova,

Some days ago I took you a question, and at moment I can`t find a solution for that (I haven`t found any information about response spectrum analysis in ANiC). Could you please help to me?

Regards,

JJJ

[david_cordova]

Please see the attached pdf.  Note that this isn't official Autodesk documentation, just a guide to help answer your question.  The way to setup the analysis is to create a modal analysis and modify that Nastran bulk data file with the additional SRS info.  You will need to add new cards, one at a time to the case control and bulk data sections.  Everything listed in the document describes what is different from a typical modal analysis, however there are some things that you can do through the In-CAD interface such as create mass elements and change parameters.  If you chose to do it through the In-CAD interface then obviously you would not need to manually add new cards for those items.  

[Anonymous]

Dear Mr. Córdova,

Thank you very much for your response. I think it is a quite complicated, do not? In my opinion it is a procedure that it should be implemented in Nastran in CAD to perform automatically: this kind of analysis is very common, almost everything in seismic applications.

Regards,

JJJ

[david_cordova]

I agree that it is cumbersome and difficult to setup.  I suggest you submit an idea to the IdeaStation for a more direct way of setting up response spectrum analysis within In-CAD:

http://forums.autodesk.com/t5/nastran-in-cad-ideastation/idb-p/76