fft,displacement, frequency

7 views (last 30 days)
Gloria
Gloria on 13 Jun 2020
Hi; I can see the maximum displacement with Figure 1 which is Displacement-time grapf.
When I apply fft I can see the correct frequency but maximum displacement doesn't match with displacement .
I guess I made mistake when I applied FFT. Can you check and help?
t=0:0.01:10;
t_step=0.01;
ts=1/t_step;
x=sin(1.66*t);
figure(1);
plot(t,x);
x =x' .*hann(length(x))*2;
N1=2^nextpow2(length(x));
freq1=(0:1:(N1-1)/2)*ts/N1;
fx1=fft(x,N1)/N1*2;
ffx1=abs(fx1(1:floor(N1/2)));
figure(2);
plot(freq1,ffx1);

Answers (0)

Categories

Find more on Fourier Analysis and Filtering in Help Center and File Exchange

Products


Release

R2016a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by