About building vibration evaluation
About building vibration evaluation
(OP)
Hi all,
I don't have much background in vibration analysis.
We're looking for a new building for our laser measurement system lab. We used a few Kistler 8393B2 (0-250hz response) to collect the vibration data for these new buildings and did some fft analysis. We want set up some criteria to evaluate the data and choose one of the building to move in. But what's start point I need to looking at? Is only the FFT I can work on the data? Should I start from these ISO or ANSI test and analysis stardard? I think I need to find out the sensitivity of our laser system first, but we don't know where to start either. Thanks for any quick put!
I'll post some fft plot for these test result.
I don't have much background in vibration analysis.
We're looking for a new building for our laser measurement system lab. We used a few Kistler 8393B2 (0-250hz response) to collect the vibration data for these new buildings and did some fft analysis. We want set up some criteria to evaluate the data and choose one of the building to move in. But what's start point I need to looking at? Is only the FFT I can work on the data? Should I start from these ISO or ANSI test and analysis stardard? I think I need to find out the sensitivity of our laser system first, but we don't know where to start either. Thanks for any quick put!
I'll post some fft plot for these test result.





RE: About building vibration evaluation
RE: About building vibration evaluation
Here are links for 3 FFT plots:
http://fil
http://fil
http://fil
RE: About building vibration evaluation
Does your equipment mfr have background vibration limits? They should.
Did I miss the units of the posted FFTs.
RE: About building vibration evaluation
I think the X units on FFTs is Hz to Y Amplitude(unit mm?). It's just a data plot after the FFT.
As for the magazine paper, do you have more details, such as title...
RE: About building vibration evaluation
Since this is a reasonably expensive decision I suggest you get someone who knows how to measure vibration to do the job.
Cheers
Greg Locock
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RE: About building vibration evaluation
Mike Halloran
Pembroke Pines, FL, USA
RE: About building vibration evaluation
My questions is not only focusing on the choosing the better one, but also to find out and set up some criteria for the vibration evaluation for our future product and project. We're trying to learning. Thanks and please input any suggestions.
RE: About building vibration evaluation
What laser measurements are you trying to make? Which ones are actually vibration sensitive?
TTFN
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RE: About building vibration evaluation
My new questions:
1. I used accelerometers to get the vibration data and I get the acceleration signals. How can get the velocity signals?
2. How can I get the root-mean-square (rms) values for the FFT analysis? What's the benefit of rms compared to the plain FFT data?
Thanks.
RE: About building vibration evaluation
Again, you need to explain what LASER measurements you're going to do and how. Measuring linear vibration might be interesting, but it might also be TOTALLY irrelevant to your laser test setup.
TTFN
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RE: About building vibration evaluation
My question now:
I have the data for Acceleration-Time from the accelermometer. How can get the RMS acceleration/Frequency plot? It might be 1/3 octave frequecy. Any suggestions?
Thanks.
RE: About building vibration evaluation
RE: About building vibration evaluation
If I did one trial and collected 100000 data (acceleration-time), can I break these data into 100 set (100 data/set) and calculate rms for each set. I get 100 data and they're all rms data. Then I do the FFT for these 100 rms data. Can I say it's the RMS(acceleration)-Frequency? Other way, I just to do 100 trial test and do the rms for 100 trial. The only difference is sample space. Am I right or wrong?
Please tell me how can I to get the rms(acceleration)-frequency. Many thanks.
RE: About building vibration evaluation
RE: About building vibration evaluation
I took a glance at the book. It's a perfect fit for my requirements.