Topic Author
Posts: 136
Joined: Thu Jan 03, 2002 11:29 pm

What Causes Engine Vibration

Thu Mar 28, 2002 12:54 am

What causes Engine Vibration? Is it off balance fanblades or somthing else
Posts: 2166
Joined: Thu Feb 07, 2002 9:51 pm

RE: What Causes Engine Vibration

Thu Mar 28, 2002 1:13 am

Lots of things. We can start making a list, see how many things we can think of? I'll start with

1) Unbalanced rotors

2) Bent shafts

3) Bearings with defects

I assume you mean jet engines/gas generator related vibrations? If you add turboprops, engine accessories and so on, there's a sh*tload of other potential sources. If you throw recips into the mix.... well, they're vibrating rather severely to begin with but you can still detect lots of things about to go wrong by monitoring vibrations in the right part of the spectrum.

I thought I was doing good trying to avoid those airport hotels... and look at me now.
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Joined: Mon Jun 18, 2001 1:29 pm

RE: What Causes Engine Vibration

Thu Mar 28, 2002 12:47 pm

Don't forget accessories on the gearbox. Hydraulic pumps, CSDs/IDGs and fuelpumps can also cause a vibration felt throughout the airframe but not on the AVM.
Posts: 1409
Joined: Tue Jan 01, 2002 1:21 am

RE: What Causes Engine Vibration

Thu Mar 28, 2002 3:55 pm

Vibration in a turbine engine is caused by loose or bent things; bad vibration is caused by big loose or bent things. Vibration in a piston engine is caused by normal operation; lack of vibration in a piston engine is usually caused by fuel starvation.
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RE: What Causes Engine Vibration

Fri Mar 29, 2002 1:21 am

Plus there are certain frequencies that things in the airplane like to resonate at... as the engine passes through the frequencies you can hear the airplane amplify them.
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