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What Causes Engine Vibration

Trent_800 From United Kingdom, joined Jan 2002, 136 posts, RR: 0
Posted (11 years 1 month 3 weeks 4 days 15 hours ago) and read 3803 times:

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

4 replies: All unread, jump to last

FredT From United Kingdom, joined Feb 2002, 2184 posts, RR: 26
Reply 1, posted (11 years 1 month 3 weeks 4 days 15 hours ago) and read 3181 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.

Air2gxs From , joined Dec 1969, posts, RR:
Reply 2, posted (11 years 1 month 3 weeks 4 days 3 hours ago) and read 3137 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.

ThirtyEcho From United States of America, joined Dec 2001, 1634 posts, RR: 1
Reply 3, posted (11 years 1 month 3 weeks 4 days ago) and read 3123 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.

XFSUgimpLB41X From United States of America, joined Aug 2000, 3952 posts, RR: 36
Reply 4, posted (11 years 1 month 3 weeks 3 days 14 hours ago) and read 3086 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.