Try this: https://files.engineering.com/getfile.aspx?folder=c3b3446c-9e7d-4600-8c5c-76614b43d076&file=SpectrumsWaveforms.pdf
Please look to the file linked above.
Maybe you would be able to help me to find the source of vibrations that we've got on na motor that is installed on a vertical pump. High level of vibration is only in one direction (perpendicularly to discharge pipe), highest on NDE. Motor is working with VFD. Motor type: 1LE5603-3BD23-4GR3-Z...