View Single Post
  #6  
Old March 7th 05, 08:09 PM
Joerg
external usenet poster
 
Posts: n/a
Default

Hello Jim,

What we know is that the engine is going to have a fundamental frequency at
cruise RPM. Let's take the math-simple engine RPM of 2400. This gives us a
fundamental frequency of 2400/60 or 40 Hz.



Just a thought: Usually the time between the onset of a vibration and
some catastrophic failure is rather short. I believe what also needs to
be detected is the higher frequency stuff that can happen well before
this. Such as friction sounds from a bearing or cam not getting enough
lubrication.

Regards, Joerg

http://www.analogconsultants.com