Here is a Newsletter with an article about the Hoover Dam turbine generators:
Vibrationdata Newsletter July 2007.
Here is a measured sound file from the generator room: Hoover.mp3
Here is a Matlab GUI script for calculating the vibration frequencies of a turbine generator: turbine_generator_frequencies.zip
Here is the data file: Hoover.zip – time(sec) & unscaled sound pressure
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Here is a related topic . . .
Vibration of AC Induction Motors and Generators: AC_motors.pdf
Matlab script: AC_induction_motor.zip
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– Tom Irvine