Find out Common Frequency Components in Multiple Signals

[Haristhota]

I have a 10 data files of vibration data at different RPMs of the spindle. I know that there are common frequency components present in all 10 data sets but I don't know those are occurring at what frequencies. 

Two find out common frequency components between two signals, there are several techniques available but how to find out common frequency components among more data files? Any ideas pls.

[Henrik_Volkers]

Seems that this is the original thread

Read about order analysis ...  Sound and Vib toolchain give some literature hints and more examples

My vi posted in the former thread list a order relation of major frequencies to the dominating frequency..

add a little uncertainty band and compare the magnitudes(and or phase) ?

What have you tried so far?

[Haristhota]

How about using PCA & ICA techniques?