MILES RULE

[CESSNA1]

HELLO EVERYONE:
I am trying to find information on "Miles rule". Apparantly it is used in vibration work. Can anyone recommend a good book or article?

Thanks to all

Regards
Dave

 

[tomirvine]

Miles equation gives the response of a single-degree-of-freedom system to a base input where the input is in the form of an acceleration power spectral density.

The RMS acceleration response is:

RMS = sqrt[ (pi/2) fn Q Y ]

where
fn is the natural frequency
Q is the amplification factor
Y is the base input acceleration PSD at the natural frequency fn

The base input PSD should be flat within one octave on either side of fn.

One octave means that the higher frequency is twice the lower frequency.

Further information is given at:

http://www.vibrationdata.com/random.htm

Tom Irvine