04-23-2018 06:38 AM
Hi
i am quite stuck with this problem and could really need help:
my Situation right now:
- concatenated 121 files with each 21000 measurments each, to a torque channel ( MyR ) and a rpm channel( Rotspd ) via skript
- created a numerik time channel ( time ) starting a 0-72600s, with 2541000 number values based on the number of files and measurements.
- choose FFT (One Time Signal), Time channel: time, Signal channel: MyR, Window type: Retancle, FFT: Amplitudepeak, Average Amplitude: None, Third/Oktave: No
( PIC: 1-3 )
my Problem:
after applying the FFT, i displayed the results and :
-the original measurment values&peaks do not correspond to the resulting amplitude peaks
i am using:
DIAdem 2015
15.0. (64 Bit)
How do i achieve the output values regarding peaks in my FFT output ?
Is there a better signal analyse funktion in Diadem besides FFT which results in Frequency(X) and Amplitude(Y) ?
Kind regards and big thanks in advance
Knicks
04-23-2018 08:40 AM - edited 04-23-2018 08:41 AM
Try selecting the top blank entry from the time channel scroll down in the FFT function
04-24-2018 05:56 AM
Hey gsklyr
When setting the top entry blank, the channel has be to in Waveform which, after converting from a numerik channel, doesn‘t seem to change the result.
In your Project, a peak max value of Noise_3 is around 0.8 but after the FFT the resulting max value of Noise_3 is around 0.004.
So why is that, and how can i achieve a result with Frequency (X) and Amplitudepeak (Y) with fitting values ?
Appreciate your help in advance
Knicks
04-24-2018 01:03 PM
Well the signal Noise_3 would be the sum of all the frequencies that make up this signal. 0.8 [Pa] seems to be a place where a lot of those frequencies intersect... I don' think the output of the FFT function is bad