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

Blow hole and pin hole porosity, Difference between   Blow hole and pin hol...

Difference between   Blow hole and pin hole porosity          Blow hole : They appear as cavities in a casting. When they are visible on the upper surface of the castings, th

Computational aerodynamics-guided reading, It is recommended that if possib...

It is recommended that if possible you should buy a copy of this book. It will prove useful for the new fourth year configurational aerodynamics module also. Blackwells bookshop ha

Flight dynamics-trim tabs, Trim tabs are small flaps attached to the rear o...

Trim tabs are small flaps attached to the rear of the main control surfaces. They can be adjusted the pilot to reduce the force required to hold the control surface in its deflecte

Logic gate-or gate , logic gate-OR gate  Figure shows the symbol that r...

logic gate-OR gate  Figure shows the symbol that represents a 2 input OR gate together with its truth table. This gate will adopt a 1 state at its output terminal when either

Means of escape, Means of escape: The means of escape can start at any...

Means of escape: The means of escape can start at any point inside a building where there may be people.      The means of escape end when 'ultimate safety' is attained out

Bme, advantages and disadvantages oh hot and cold die working in the subjec...

advantages and disadvantages oh hot and cold die working in the subject of basic mechanical engineering

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

Homework, name the functions of the CIPM

name the functions of the CIPM

Bragg''s spectrometer , It consists o a source of x ray, with a number of c...

It consists o a source of x ray, with a number of collimated slits. Crystal under investigation is mounted on a table, and the position of this table can be recorded on vernier sca

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