third octave operations with "sound and vibration toolkit"

[bastien]

Hi!

I’m working about third octave decomposition with a vibration signal.
I’m using the sound and vibration toolkit.
The sample frequency of my signal is 2400 Hz.
And I’m working with a 1 second vibration signal (so 2400 points).
Fs = 2400
N = 2400

I need to understand the different and successive operations that the “SVT Fractional-octave Analysis [IEC].vi”VI do.

In fact, I think that my frequency resolution (df = Fe/N=1Hz) is too low.

Do you have a solution?

Maybe I could turn into my 1 sec signal in 10 sec signal with 10 recopies and assemblage of my previous signal?

N’ = 10N so df = Fe/10N = 0.1Hz.


Thanks for your help.

Bastien of paris

[Marc L.]

Hello,

The first thing you have to do is to read the Chapter 7 of the user manual of the Sound and Vibration Toolset.
You can find it in : program -> National Instruments -> LabVIEW Sound and Vibration Toolset -> User Manual
This chapter discusses fractional-octave analysis, including fractional-octave analysis theory, averaging modes supported by the
Octave Analysis VIs, settling time, and ANSI and IEC standards.

regards,

Marc L.
NIF