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

Angle rate systems , Traditionally, seekers have been simple correlation tr...

Traditionally, seekers have been simple correlation trackers and a set of gimbals that are used to measure the angle rates of the target.          - Infrared seekers detect a

Bjt, why we use h for bjt

why we use h for bjt

Tool life, hi I''m doing research in tool life of solid carbide endmills ...

hi I''m doing research in tool life of solid carbide endmills and I was looking at your formulas. I was wondering if tell me or where I can find the data required for these formu

Deadlock based problem in operating system, Deadlock based problem in opera...

Deadlock based problem in operating system# Deadlock usually occurs between a known set of processes that end up waiting on each other. If we cannot prevent or avoid deadlock, anot

Coupling and cohesion, advantages and disadvantages of coupling and cohesio...

advantages and disadvantages of coupling and cohesion

Embedded system, need it in 10 days time and in Australian cods if there is...

need it in 10 days time and in Australian cods if there is

Nominal rate of interest, the real risk free rate of interest is 3 percent....

the real risk free rate of interest is 3 percent. Inflation is expected to be 3 percent for 2 years. What is nominal rate of interest for the 2 years bond?

Image orthicon camera tube, What are the disadvantages of Image Orthicon Ca...

What are the disadvantages of Image Orthicon Camera tube

Q1, 5) Dupree Funds is considering the fees charged by two banks. First Ame...

5) Dupree Funds is considering the fees charged by two banks. First America charges a flat rate of $0.11 per payment and First Western requires a deposit of $500,000 (that does not

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