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08-25-2018
06:26 AM

08-25-2018
06:26 AM

question matrix

hai all

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

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6 REPLIES 6

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08-25-2018
10:45 AM

08-25-2018
10:45 AM

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

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08-25-2018
11:28 AM

08-25-2018
11:28 AM

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

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08-26-2018
12:36 PM

08-26-2018
12:36 PM

Re: question matrix

thanks for your help

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

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08-26-2018
01:09 PM

08-26-2018
01:09 PM

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

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08-26-2018
03:33 PM

08-26-2018
03:33 PM

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:

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08-26-2018
04:06 PM

08-26-2018
04:06 PM

Re: question matrix

THANKS FOR HELPING ME

IT IS WORKING NOW

THANKS

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