Road profiles of spectral time domain transform into power spectral density

Hi,

I obtained some data of measuring a road profile in time domain. How can I transform it into power spectral density to get it reproducible by an electrodynamic shaker? I have got some information from Altairone Compose lectures, but I have just done to transform time domain into frequency domain by Fast Fourier Transform. What would be the next step to get PSD diagram?

Regards,

Ferenc Madaras

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Adriano_Koga

in Compose, you can convert time series into a PSD by using the 'pwelch' command.

Also, you might find more info here in the ebook for signal processing.

https://altairuniversity.com/48244-new-ebook-signal-processing-with-altair-compose/

Ferenc

And how cand I obtain that signal which is mentioned above (x) from a time - acceleration spectrum? Do you have an idea?

Ferenc

look at the attachment

Capture.PNG

Adriano_Koga

And how cand I obtain that signal which is mentioned above (x) from a time - acceleration spectrum? Do you have an idea?

i'm not sure if I got your question.

assuming that you have this data measure from somewhere, you can load it into compose, using reading functions.

I believe walking through this playlist might help you.

https://www.youtube.com/watch?v=xNbxZJhWcgI&list=PLGNemB0NFb0DgjZNin-iU6Z9LfsawcNTe

João Marabisa

look at the attachment

He @Ferenc ,

Sorry for the delay, I'm attaching a package with data file + OML script file that will generate a PSD from the timeseries data.

There are several ways to calculate the PSD, and the e-book mentioned by Adriano is nice to read and learn about it. I used one of the approaches that are explored there, feel free to play with others.

Ferenc.zip