Damping ratios computation

[Francesco]

Hello,
At present I am using a VI that aquires accelerations from accelerometers for vibrational testing and then I use a different software to get a Fast Fourier Transform spectrum (with the natural frequencies) and the damping ratios. Is there a VI already developed that would give me the frequency spectrum (with magnitudes of the natural frequencies) and the damping ratios for the data I aquire? I am referring to any VI that I customise to my needs.
I am new to Labview so bear with me.
🙂
Thank you,
Francesco

[Lab Viewer]

Hi Francesco,
In LV 6 Pro there are some FFT Vis, but I don't know it those match your needs because I never use them.

Good luck

[Lab Viewer]

to find them easily, run a text search in all VIs.

[Christopher Mitchell]

There is also a Sound and Vibrational Toolset that may be beneficial to you:

http://sine.ni.com/apps/we/nioc.vp?lang=US&pc=mn&cid=3122

[BruceAmmons]

Francesco,

The standard waveform measurement tools in LV 6 provide the tools you need for FFT analysis, which will also locate your dominant frequency and its harmonics. Look at "Extract Single Tone Information.vi" and "Harmonic Distortion Analyzer.vi"

To measure a damping ratio, you have to use tools designed for analyzing impulse signals. I am not aware of any tools in any of the existing NI toolkits that provide this tool. It is possible to write your own, but it gets a little tricky, depending on your application.

Bruce