when I applied fft to displacement-time data , I cant see maximum displacement value?

2 views (last 30 days)
Maximum displacement is 1 , but with fft I can only see 0.9267? Where is my mistake?
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;
%x=x'.*flattopwin(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 Vibration Analysis in Help Center and File Exchange

Community Treasure Hunt

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

Start Hunting!