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Questions tagged [aeroelasticity]

The interaction between elastic aircraft parts and the air they pass through, which can cause the structural failure of said parts.

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What is the difference between flutter and vortex induced vibration?

During flutter, the airfoil oscillates with a large amplitude, which generates vortices at the wake. In vortex induced vibration (VIV) the oscillations of the airfoil are caused by the shedding of ...
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1answer
73 views

How do airliners with engines mounted on places other than wings suppress wing flutter?

Assuming airliners typically have high aspect ratio flexible wings, how are wing flutter suppressed when engines are not available on forward-reaching pylons as weights?
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How can I find or calculate typical flutter velocities for different wings?

I need to validate a code I wrote for calculation of dynamic aeroelastic response of a wing for my aeronautical engineering Master thesis. I'd like to ask if anyone may provide me a list with typical ...
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1answer
74 views

How do we choose a frequency range of interest for flutter prediction?

I'm trying to perform some flutter and dynamical (gust etc.) calculations with Nastran. It has been told to use a range up to 30 Hz for an aircraft I'm working with, but why the upper limit is so ...
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0answers
39 views

Can a large aspect ratio wing be actively controlled using distributed electric propulsion to avoid getting ripped apart in wind shear?

This question is related to the recent possibility of solar aircraft becoming flyable. Solar Impulse, the NASA Helios, and the Titan Aerospace/Ascenta Aerospace solar drones have all have issues with ...
4
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0answers
119 views

How do active blades work on helicopters?

Can someone throw some light on 'active blades' as used in helicopters? I'm mostly interested in the use of piezoelectric material and actuators. How are the actuators able to sense the change of ...
8
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3answers
528 views

How can engine positioning affect flutter tendency?

I understand that moving the engines towards the wingtips would increase flutter tendency, but are there any other positioning options which could affect flutter? How about moving the engine ...
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0answers
350 views

How to define pitch angle for a passive variable pitch propeller?

This question is a continuation of the question How to calculate variable pitch propeller parameters? mentioned before. Actually, the theory described as an answer on the question above is the exact ...
14
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2answers
9k views

What is the reason for the poor low-speed characteristics of sweptback wings?

I know there are advantages of swept-back wings delaying shock-wave allowing a aircraft to fly faster. However, what are the disadvantages. I know one of them is that they have very poor low speed ...
4
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4answers
675 views

Is Fluid Structure Interaction considered in aircraft design?

Fluid Structure Interaction (FSI) causes an aeroplane’s geometry to change and hence the forces on the different surfaces of an aeroplane become different than the forces expected according to ...
6
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1answer
2k views

Why can not two modes coincide perfectly for some cases in Flutter phenomena?

I have a question about flutter phenomena. As you know, flutter occurs when two modes (for example, first mode and second mode) coincide (that is, after a specific velocity, the frequencies of two ...
7
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1answer
3k views

Is flutter speed always smaller than divergence speed for aircraft?

In aeroelasticity, there are three main phenomena that one should take care of: divergence, aileron reversal and flutter. Each of them has an associated speed at which the phenomenon might start to ...