Hi everyone, i have one query, how mode shapes can be drawn from a mode shape vector. Actually mode shape should comprise of a lot of points while i got just one point, its real and imaginary part; how could a mode shape can be generated from that ?

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Ayisha Nayyar
Ayisha Nayyar 2018-9-27
评论： Ayisha Nayyar 2018-9-30
Hi everyone, i have one query, how mode shapes can be drawn from a mode shape vector. Actually mode shape should comprise of a lot of points while i got just one point, its real and imaginary part; how could a mode shape can be generated from that ?
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Ayisha Nayyar
Ayisha Nayyar 2018-9-27
Thanks a lot Image analyst for your guidance. Sorry for in convenience. Here's my code: f=f; fs=6400; mnum=5; for i=1:21; frf=b1(:,i); [fn,dr,ms]=modalfit(frf,f,fs,mnum,'Fitmethod','pp'); end
(where f is the frequency range starting from 1 to 2500Hz and fs= sampling frequency, frf is basically a FRF matrix of beam at 21 different points. frf=b1 and b1 is attached below.
and the part of answer showing modal shape vectors are displayed below:
0.00535814008085992 - 0.00535814008085992i 0.00348266401908543 + 0.00348266401908544i 0.000828406087890749 + 0.000828406087890727i 0.000406450088748395 + 0.000406450088748393i 0.000139194497984241 + 0.000139194497984201i
My question is that, whether they are correct mode shape vectors or not? if correct, how to draw mode shapes from them? Please help me out.
Ayisha Nayyar
Ayisha Nayyar 2018-9-30
Dear all, i am badly stuck in finding modal parameters from modalfit command. the problem is instead of a vector, o am getting just a single point as mode shape vectors. Please help me out.

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