save data from a frequency domain acquisition

[go-go]

I am an italian student and I am trying to monitoring a cutting marble process using accelerometers. I have done a programm using Labview 6 and I am able to save data displaing in time domain to read them with excel, but I am not able to save data from displaing in frequency domain.Someone can help me? Thank you.

[Majicz]

"Hello
Frequency = 1/Time
frequency is the reciprocal function of time and is available in "Functions pallette -> Numeric pallette"
wire your time value into this and it will return 1/X which is the frequency of the corresponding time. and save the data which is giving the frequency output to save to file
Have a great day.
Regards~
mathews.j@consultant.com

[go-go]

Hello, thank you for have answered to my question but probably I haven't explain my problem very well.
My problem is this: after processing the signals obtained with the accelerometers using the fft I have obtained a graph.I want to save it in a file that I can use like I want but I am not able to do it.

[preston_johnson]

With your frequency spectrum, you have three elements, (f0, delta-f, and an array of numbers for magnitudes of each frequency bin). You can write this data to excel in the same way you write time domain data. You can even re-cluster your FFT data as a time waveform, and use the write waveform to spreadsheet functions.

I am curious to learn more about your application. I specialize in rotating machinery applications for NI and would welcome the opportunity to learn more of your interpretation and expected use of the data. It may be we have even more help to offer.

Hope this helps.

Preston Johnson
preston.johnson@ni.com

[Anonymous]

Thank you very much.
I am trying to find a correlation between tool wear and amplitude of
frequency spectrum in a milling process using accelerometers.Now I am
able to acquire the signal and to save it,but making the experiments I
have find too much peak, so I am looking for having not the smaller
frequency. To do it I have introduced a digital IIR Filter in my
software, but even if I set a highpass filter and a frequency (for
example 30Hz)I have the same, in the spectrum, a signal at frequency
under that fixed (5, 10,20,25,29 Hz).
I am wronging in setting parameters or in using that tipe of filter?
Thanks