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

Smoke control - fire protection engineering, Smoke control - fire protectio...

Smoke control - fire protection engineering: Smoke control is a complex subject and requires a course of at least one whole week to begin to understand how it is used in build

Architectural Design and Drawing, how can I improve my G+4 apartment with r...

how can I improve my G+4 apartment with rendering with pen and ink

Flight dynamics - introduction, In the Aircraft Performance course, the air...

In the Aircraft Performance course, the aircraft was assumed to be in a steady-state (e.g. steady  cruise, climb, turn, glide), with the forces and moments balanced. The subject of

Interlaminar shear strength , Composites have low shear strengths compared ...

Composites have low shear strengths compared to longitudinal strengths. The ILSS test is a simple 3 point bend test, requiring a small amount of material. A span to depth ratio

Fire evacuation signals, Fi r e evacuation signals: Members of the ...

Fi r e evacuation signals: Members of the public are known not to respond positively to fire evacuation signals. People will often try to ignore the signal and will try to

International business, VK Ltd a multi product company, furnishes you the f...

VK Ltd a multi product company, furnishes you the following data relating to the year 2000. First half sales Second half sales Sales Rs.45000 Rs.50000 Total cost Rs.40000 Rs

Thermodynamics.., Steam enters in the turbine at 6 MPa and 450 deg C and ex...

Steam enters in the turbine at 6 MPa and 450 deg C and expands at some intermediate pressure 60 % of steam is extracted and remainder expands to 10 kPa at this Investigate the effe

Effects of temperature and altitude on engine, Effects of Temperature and A...

Effects of Temperature and Altitude. Cold and/or Low On cold days the air density will increase. If the engine has a ‘part throttle rating' and the throttle is advanced to

Clippers, WHAT IS THE DIAGRAM OF TWO LEVEL CLIPPER WITHOUT REFERENCE AND EX...

WHAT IS THE DIAGRAM OF TWO LEVEL CLIPPER WITHOUT REFERENCE AND EXPLAIN

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