fft,displacement, frequency

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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);

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