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Structural Dynamics and Stability

DM_9837618
Guest

Structural Dynamics and Stability

Hi everyone, I think for you it is a piece of cake but I have to ask you something. I would like to calculate matrix K-Lambda M and determine egenvectors W. I tried but my checks are not satisfied. The values are diagonal but they have to be around zero exept 11,22,33. I need the help what kind of functions should I use?

DM_9837618_0-1614557918088.pngDM_9837618_1-1614557928687.pngDM_9837618_2-1614557935119.png

 

 

 

 

 

 

 

5 REPLIES 5

Re: Structural Dynamics and Stability

Hi,

 

Enclosed is a Mathcad 15 file I have found useful for vibrating beams.

Ask nicely and it probably can be converted to Prime with a bit of work.

 

The function you are looking for is Gamma=genvals(Kg,Mg)  where Kg is the global stiffness matrix and Mg is the global mass matrix.  See the file where this is done.

 

The file assembles the Kg and Mg 

 

Cheers

Terry

Re: Structural Dynamics and Stability

Hi

Here is the Prime 6.0 file conversion.

Cheers

Terry

Tags (1)

Re: Structural Dynamics and Stability

Very nicely done!  (Will run in Express!)

Re: Structural Dynamics and Stability

Attached is a document I developed a while ago, a spring/mass problem--same math.  Maybe it'll help.

Re: Structural Dynamics and Stability

Thanks for your Help. Cheers

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