Dynamic Stiffness

Hi Rahul K,

Run a FRF analysis.

Hello All,

can any one tell me mathematical formulation for structural analysis. static and modal

 

Hi,

Refer attached Pdf.

Regards

Rahul R

Unable to find an attachment - read this blog

thank you sir.

dear sir ,

 in that pdf only they mentioned the cards for nastran and there is no mathematical formulas to calculate static analysis

Optistruct & Nastran cards are almost similar.I have shared Optistruct user guide in which governing equation are available.

In some of the FEA books you would get formulation of stiffness matrix for different type of analysis.See attached screenshot for static analysis of rod element from practical finite eleement analysis book written by Mr Nitin Gokhale.

Regards

Rahul R

<?xml version="1.0" encoding="UTF-8"?>

thank you sir.

dear sir ,

 for modal analysis is there any formula apart from  wn2=k/m?

See attached screenshot.Refer same pdf which i shared earlier for more info.

Regards

Rahul R

<?xml version="1.0" encoding="UTF-8"?>

Hi Prakash and Rahul,

I have done Modal frequency response analysis by giving Displacement as a input and force as a output.

Now my question is, How to calculate Dynamic stiffness of component?

Hi Rahul,

The dynamic stiffness is the frequency dependent ratio between a dynamic force and the resulting dynamic displacement.

You can post-process the same using HyperGraph. Since you are a commercial customer, I would suggest to get in touch with INDIA support team.

we suggest you contactcommercial support hotline by phone etc. here - Commercial Support contact

Dear Prakash,

Thank you for the vital information.

dear sir

 nvh analysis means modal frequency response analysis?

 i have intervw on nvh analysis can any one share dat file and give me some datas to learn on that