Cause of aircraft vibration?

Question

Cause of aircraft vibration?

Answer 1

It could be the engine is not well isolated from the airframe.

It could be flutter in one or more of the control surfaces.

It could be turbulent air flow battering the airframe.

There are probably dozens of other reasons.

Answer 2

lots of things

Answer 3

probably some imbalance in the engine or propeller,

loads of other causes.

Answer 4

Vibrations come from all sorts of places.

if there are two propeller engines, the props may not be 'synchronized" (running at exactly the same speed)

Wheels down and wheel well cowling shed vortices that cause a lot of noise and shaking.

there are lots of electrical motors and fans onboard that can vibrate....

all sorts of things.

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Answer 5

They all vibrate. They even put vibrators on the altimeters in gliders so they don't get hung up.

Answer 6

Can you provide some additional information?  

1. Aircraft type?

2. Type and location of vibration?

3. Stage of flight?

4. Weather considerations?

Even with that info there would be no way to be sure, but at least we could narrow down the conversation.

Answer 7

Can you please give us more details?

Type of aircraft, severity of vibration, continuous or intermittent, stage of flight, ambient conditions, other noticeable factors?

Thanks.

Answer 8

Most aircraft vibration is caused by imbalance in the engine rotating hardware. In turbine engines, this can be an interesting challenge due to the wide speed range that is used by (generally) two rotors spinning at very high speeds. Because of the high speeds and the fact that radial load is proportional to speed ^2, these tend to be persistent vibration sources. The engines are mounted on isolators that damp out a significant portion of the forcing function from the engines, but some always gets through. Whatever does get through tends to drive resonances all around the aircraft at the natural frequency of the component that is vibrating. For example, an interior panel may have a loose fastener that allows the lightly damped panel to resonate at 80 Hz, which is 80 cycles per second, or 4800 cycles / minute. When one engine or the other has a rotor pass through 4800 rpm, that panel will start to sing like a tenor at the opera. Work is constantly being done to improve isolators and reduce excitation.

Answer 9

only one reason for aircraft vibration,,    it must be a propeller driven aircraft, and the propeller must have a crack on its surface,     check the blades    ,,