Take FFT data and apply a hand arm weighting filter
I have taken some vibration data and converted it to an FFT then saved this data to a csv file (Freq versus m/s^2). There are three axis of vibration so the file contains four columns: Frequency, X vib, Y vib, Z vib. There are about 1600 lines with frequencies starting at around 25 HZ up to about 19,999 HZ.
Can I take this file, read in the FFT data, and apply a hand-arm weight to the data using the weighting VI or one of my "home made" weighting VIs?
I would like to convert the FFT data to a 1/3 octave spectrum, then weight the spectrum according to ISO-5349 (hand arm vibration).
I know how to do all of this with the raw (time domain) data but this is saved FFT data.
Not sure if the question makes sense, but basically I screwed up and took some vibration numbers, saved the FFT but forgot to apply the 1/3 octave hand arm vibration weight. Just wondering if it can be done later.
Jeff
Hi ykhalil,
Here's a pretty detailed explanation of signal processing in LabVIEW:
https://decibel.ni.com/content/docs/DOC-3022/version/1
Also, are you using the NI Sound and Vibration Toolkit?
Regards,
Lindsey W. | Applications Engineer | National Instruments
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I have a situation where there will be one "standard" set of data (source_data below) and I will need to get information on results for certain groups of clients > (client_data being an example). As straight SQL this would be very easy (see below) -- real world problem is a little more complicated. Can you give a more accurate representation of the real world problem?
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