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What Causes Engine Vibration  
User currently offlineTrent_800 From United Kingdom, joined Jan 2002, 136 posts, RR: 0
Posted (12 years 3 months 4 weeks 1 day 9 hours ago) and read 5500 times:

What causes Engine Vibration? Is it off balance fanblades or somthing else

4 replies: All unread, jump to last
 
User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 1, posted (12 years 3 months 4 weeks 1 day 9 hours ago) and read 4880 times:

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.

Cheers,
Fred



I thought I was doing good trying to avoid those airport hotels... and look at me now.
User currently offlineAir2gxs From , joined Dec 1969, posts, RR:
Reply 2, posted (12 years 3 months 4 weeks 21 hours ago) and read 4836 times:

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.

User currently offlineThirtyEcho From United States of America, joined Dec 2001, 1643 posts, RR: 1
Reply 3, posted (12 years 3 months 4 weeks 18 hours ago) and read 4822 times:

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.

User currently offlineXFSUgimpLB41X From United States of America, joined Aug 2000, 4190 posts, RR: 37
Reply 4, posted (12 years 3 months 4 weeks 9 hours ago) and read 4785 times:

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.


Chicks dig winglets.
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