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How Do I Plotting in Time Domain?

Asked by Agus Arianto on 13 Sep 2019
Latest activity Edited by dpb
on 13 Sep 2019
Accepted Answer by dpb
I have vibration data from the spur gears. Data is displayed in a .mat file. The first column is data from the accelerometer while the second column is data from the tachometer. Data is taken for 10 seconds with a sampling rate of 17066 Hz. Gear shaft frequency is 22.59 Hz. How can I plot 10 times the rotation of the shaft in a plot time domain with the x-axis in the second?

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1 Answer

dpb
Answer by dpb
on 13 Sep 2019
Edited by dpb
on 13 Sep 2019
 Accepted Answer

>> format bank
>> 10/22.59*17066
ans =
7554.67
>>
10 rev/22.59 rev/sec * 17066 samples/sec --> samples/10 revolutions
Oh. I did forget the second half of the Q?, sorry.
t=0:dt:(size(data,1)-1)*dt; % "data" is your array variable
xlim([0 0.5]) % pick desired subset to display
Above lets you plot the whole vector and pick what part to display--just use subscripting to find the pieces of interest as shown above if don't want the full time series plotted. If you wanted the first 10 revolutions, that would be
Npts=ceil(10/22.59*17066);
plot(t(1:Npts),data(1:Npts))

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How to convert x-axis from 'sample' like above to x-axis like this ?Capture1.PNG

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