Hi everyone, kindly help me out in resolving my problem. Can we find out eigen vectors (mode shape vectors) from frequency response function matrix. I know that ,value of frf matrix at eigen value(nat freq) is the sum of eigen vector values? but how

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Ayisha Nayyar 2018-9-23

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评论： Ayisha Nayyar 2018-9-23

Hi everyone, kindly help me out in resolving my problem. Can we find out eigen vectors (mode shape vectors) from frequency response function matrix. I know that ,value of frf matrix at eigen value(nat freq) is the sum of eigen vector values? but how?

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Ayisha Nayyar 2018-9-23

Thanks for your guidance Kalyan, actually I have a frequency response function matrix size 2500x21,where 2500 represents frequency and 21 represents point on a beam, from which this data is collected from an accelerometer. I know eigen values/natural frequencies of this matrix through modal analysis. Now I wish to find out mode shape vectors/eigen vectors, from this frf matrix directly. I used modalfit command, but I don't know why matlab gives error by saying, incorrect syntax. I want to know that is there any other method with the help of which mode shape vectors are calculated durectly from this frf matrix...

Ayisha Nayyar 2018-9-23

Moreover read literature, which shows that we can find eigen vectors from stiffness matrix and mass matrix, but problem is that I just have frf matrix, can I find mass and stiffness from that, I guess no...

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