need to convert excel (time domain data ) to frequency domain data

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i have excel (.csv) file ... that is time vs acceleration data for cantilever beam. i need to convert in to frequency domain for find out natural frequency of cantilever beam

Accepted Answer

rifat
rifat on 26 Apr 2014
Assuming the Excel file contains time data in column 1 and acceleration data in column 2
% read data
data=xlsread('fileName.xlsx');
% frequency analysis
y=fft(data(:,2));
len=length(data(:,1));
n=0:len-1;
fs=50; % mention your sampling freq
N=n*fs/(len-1);
plot(N,abs(y));

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