Torsional divergence, Other Engineering

Assignment Help:

 Torsional Divergence

Lets first try to explain and interpret torsional divergence for the aerofoil structural model physically. An additional figure describing the mechanical system to discuss torsional divergence is given In steady flight the aerodynamic forces and moments, acting on the wing and trying to deform it, are balanced by the elastic restoring forces and moments. The wing does not deform from its steady position. A disturbance of the steady flight conditions introduces an additional aerodynamic moment trying to twist the wing which is resisted by the elastic moment.
While the elastic moment is independent of the flight velocity, the aerodynamic moment is not. Basically, the aerodynamic moment linearly increases with the dynamic pressure. An incremental increase in twist may cause an incremental increase of the aerodynamic moment, which in turn incrementally increases the twist. Then, there may exist a critical dynamic pressure (flight velocity), when the elastic stifiness can not resist the aerodynamic moment, and the wing becomes torsionally divergent. 

Lets add some mathematical expressions. The flap deflection is locked and set to zero when discussing torsional divergence. In steady flight there is assumed to be a "rigid" angle of attack αr. The angle from zero lift line is then the sum of αr and an elastic twist αe in the torsion spring due to aerodynamic loading:

                                                  a=ar+ae

 

 


Related Discussions:- Torsional divergence

.quantifying financial risk, What is the standard deviation of return if we...

What is the standard deviation of return if we have the following two possible outcomes: a rise of 8.00 per cent with 0.58 probability or a fall of -6.00 per cent?

Financial econometric , need solution in Financial econometric, Do you have...

need solution in Financial econometric, Do you have an expert in Financial econometric

Mechanism for dislocation in plastic deformation, Q. Explain the mechanism ...

Q. Explain the mechanism for dislocation in plastic deformation. Ans.  Stresses are acting on dislocation in a crystal that is known as stress field, due to these stress forc

#, • ''Discussed Since the promised return on Russian government debt is mu...

• ''Discussed Since the promised return on Russian government debt is much higher than the promised return on US government debt, you should invest your money in Russia

Strain hardening, Q. Define the concept of strain hardening. Ans. S...

Q. Define the concept of strain hardening. Ans. Strain hardening or work hardening in metal occurs because of interaction between the this location and some of obstruction.

Aad instruction, Ask question #Minimum 100 words acexplanation of aad with ...

Ask question #Minimum 100 words acexplanation of aad with examplescepted#

Mr tiy, Hi, do u help with HYSYS assignment ?

Hi, do u help with HYSYS assignment ?

Static unbalance-aircraft maintenance , Static Unbalance: This arises w...

Static Unbalance: This arises when two EQUAL unbalance masses are positioned at opposite ends of a rotor and spaced at 180 from each other. If placed on knife-edges, the rotor

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd