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question matrix

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question matrix

hai all 

hwo to get the solution of the d , from the equation (k-w^2*m)*Phi
Capture.JPG

6 REPLIES 6

Re: question matrix

This does not make sense.

The variable 'd' is not in the equation you provide, so you cannot solve for it.

Note that 'find' can only be used in a 'solve block', and a solve block cannot be used in a program.

Where is the worksheet?

What exactly are you trying to achieve?

 

Luc

Re: question matrix

Hi

 

(k-w^2*m)*Phi

 

Can be expressed as k*Phi=w^2*m*Phi

 

You can resolve w^2=genvals(k,m).  So w is simply the element by element square root of genvals(k.m).

You can resolve the modes as modes=genvecs(k,m).

 

Regards

Terry

Re: question matrix

thanks for your help 

 

kindly how to get the values of phi (eign values ) like as shown in figure below 

Capture.JPG

Re: question matrix

Hi,

 

You can resolve w^2=genvals(k,m).  So w is simply the element by element square root of genvals(k.m).

You can resolve phi as phi=genvecs(k,m).  Each column of phi is a mode shapes.

 

Regards

Terry

Re: question matrix


@mostafaelhodiry wrote:

thanks for your help 

 

kindly how to get the values of phi (eign values ) like as shown in figure below


Just type in what terry had already written a few times. There is no more to it!

Here is an example with the values you provided in a file you attached in another post:

B.png

 

Re: question matrix

THANKS FOR HELPING ME 
IT IS WORKING NOW 
THANKS