Octave to uff

Hello,
I am performing vibration analysis and have to save all data in UFF format. I am unable to write one third octave data to UFF. Please can anyone help me out?
Basic problem I am facing is, octave data in X-axis is not linear and SVT does not allow it.
Thanks in advance.

Hi,
Using of NI Sound
and Vibration Toolkit you can convert .TDMS to .UFF file format. Click Here you will get answer for this conversion with some of the example.
Sivaraj M.S
CLD

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Solution for converting the UFF58--- UFF58b or UFF Ascii.

Dear all,
Rightnow, I'm working on vibration analysis by using LV signal express
2010 which seem can be exported the measurement file as the UFF58. (Universal
File Format)
but my problem is; I have to use this measurement file with another program which accept only the UFF58b and UFF Ascii format.
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It looks like the LabVIEW Sound and Measurement Suite would do the trick, or possibly Diadem, though I'm not sure if you have LabVIEW. What program are you trying to open the file with? It may also have a package you can download that supports all of the formats. For instance, there appears to be a UFF file reader and writer if you Google "uff files" in the top result, but that's only if you were using a specific program. But I suppose the easiest way would be if you already had the Sound and Measurement Suite.
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Hi!
I’m working about third octave decomposition with a vibration signal.
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The sample frequency of my signal is 2400 Hz.
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Filter in DFD.PNG ‏161 KB
Filter Criteria.PNG ‏80 KB

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My filter also had the additional requirement of using a sample rate of 1000Hz, so I had to change the stopband edge frequency based on that sample rate. I found that the rolloff rate corresponds directly to the order of the filter, and since for Butterworth filters, order 2 corresponds to 12dB/Octave, order 3 to 18dB/Octave, and order 4 to 24dB/Octave, any of those 3 orders of filter will fit my criteria. By adjusting the stopband freqency it's possible to change the order of the filter, so as below the stopband frequency of 327Hz gives an order 3 filter, which should be right in the middle of the acceptable range.
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Lowpass order 3.PNG ‏37 KB

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Message was edited by: musicspirit

The specs for the NI model 4552 DSA card realtime octave addon are listed as max 10KHz band for one-third octave on 4 chan

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One third octave alaysis

Hello everybody.
First, I'm sorry for my bad english. Hope everybody understands!
I'm studying vibration analysis, and I need to use an already measured data (acceleration in g/ time in seconds) to compare with the vibration criteria curves (picture below).
Note that the VC curves axis are Vrms (um/s) X 1/3 octave band Frequency (Hz). Well, I am able to do some integration of my raw data and get the values in velocity X time.
If I use a FFT, I can go to frequency domain. But I don´t know how to express my data using this 1/3 octave band.
I would appreciate a lot if someone could help me!
Thanks in advance!
Henrique

Hello Henrique,
To have a function to do 1/3 Octave analisys direct you need have installed LabVIEW Sound and Vibration Toolkit or Sound and Vibration Measurement Suite.
http://zone.ni.com/reference/en-XX/help/372416H-01/TOC27.htm
http://zone.ni.com/reference/en-XX/help/372416F-01/TOC20.htm
http://sine.ni.com/nips/cds/view/p/lang/pt/nid/209056
http://sine.ni.com/nips/cds/view/p/lang/pt/nid/209061
The following link have an example using Sound and Vibration Toolkit functions, but only open if you have this toolkit installed.
https://decibel.ni.com/content/docs/DOC-2085
Best regards,
Abel Souza
Engenheiro de Aplicações
National Instruments Brasil

Third octave analysis giving very close but in accurate results

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Hello Greg,
I cannot say that I have seen a similar problem. Which version of LabVIEW are you using? Which Sound and Vibration option have you installed?
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Regards,
George T.
Applications Engineering Specialist
National Instruments UK and Ireland

Octave to uff

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