Take FFT data and apply a hand arm weighting filter
- From: jeff_scharpf <x@xxxxxxxx>
- Date: Wed, 7 May 2008 16:10:06 -0500 (CDT)
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
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Relevant Pages
- Re: Human Vibration Weighting Curves as specified in the ISO standards
... The following 9 weighting filters are available for Human Vibration. These filters
support both 1 and N channels: ... based on ISO 2631-1 ... W m - Weighting for whole-body
vibration in buildings, all directions, based on ISO 2631-2 ... (comp.lang.labview) - Re: Human Vibration - 1/3 octave weightings according to ISO 5349
... The following 9 weighting filters are available forHuman Vibration. These filters
will support both 1 and N channels: ... based on ISO 2631-1 ... W m - Weighting
for whole-body vibration in buildings, all directions, based on ISO 2631-2 ... (comp.lang.labview) - Re: ISO 5349
... For the weighting, they give a formula, a graph, and a table. ... I don't
know if I'm allowed to reproduce it here, ... (comp.lang.labview)
