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

Water traetment, what are the different phosphates used in water treatment?...

what are the different phosphates used in water treatment?

Cell arrays matlab, Expertsmind.com offers  Cell Arrays matlab assignment ...

Expertsmind.com offers  Cell Arrays matlab assignment help In matlab, Cell arrays are just like frequent arrays in that they are "indexed" details of information, with an out

Aircraft engine, what is the basic operation of gas turbine engine?

what is the basic operation of gas turbine engine?

What are the elements limiting higher data rate in networks, Question: ...

Question: (a) What are the elements limiting high data rate in cellular networks? (b) Describe the following characteristics of 4G mobile networks: - Always on - RAN A

Fabric types - woven rovings , The terms roving and yarn are widely used. A...

The terms roving and yarn are widely used. A roving is a collection of untwisted strands wound together. A yarn is a generic term for a continuous strand of textile fibres, filamen

Electronic , how to work ever moll models

how to work ever moll models

MICRO PROCESSOR, Describe the operation an 8086 will perform when it excute...

Describe the operation an 8086 will perform when it excutes ADD AX,BX

Circuit analysis, One thing I have always thought that experienced repair p...

One thing I have always thought that experienced repair people knew about was circuit analysis. I always imagined that when looking at schematics I would be able to figure the vol

Control surface effectiveness and reversal, Control Surface Effectiveness a...

Control Surface Effectiveness and Reversal To discuss the effectiveness and loss of a control surface, we allow a rigid rotation δ of the flap set by a flight control system (o

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