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Converting Time domain to frequency domain

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Old   October 26, 2016, 11:44
Default Converting Time domain to frequency domain
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Hello, I am doing research on motion characteristics of particular catamarans using Star CCM+. I'm particular interested in Heave and Pitch motions.The results I am getting are in time series; I tried performing FFT to convert in into frequency domain, But my Y axis changes to power spectral density instead of showing me the amount of heave and pitch. Can anyone please help me with the issue? I want my X axis to be frequency and my Y axis to show heave and pitch.

Right now My FFT results look like, I am trying to get a graph which is similar to, I can calculate my encounter frequency once I perform FFT,but To get the transfer function (i.e Y axis) I will need Heave amplitude RMS, But I don't know how to proceed from power spectral density.
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