Is there any other transform (except FFT) to find out harmonics in the waveform?

Dear all,
I am doing a project on finding other transform (except FFT) to find out harmonics in the waveform. I hope someone can tell me the methods. I have found a lot of time on internet and got no result. Thanks.
Victor

Hello Victor,
If perhaps you are working with rotating machines where the frequency of an "n times per revolution" event is dependent upon the speed of the machine, you may want to look at Order Analysis.
Events that occur a given number of times per revolution occur at the same position each revolution regardless of the rotational speed.  However, the frequency at which they occur is directly related to the rotational speed.  Order Analysis removes this speed dependency by transforming the phenomena from the time-based domain into a position-based domain.
In the position-based domain, the recurring events are displayed as a the "number of times the event occurs per revolution" instead of the "number of times the event occurs per second" (i.e. frequency).  At least this is my interpretation of it based on my experience.
Best Regards,
Chris 

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