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

Aggregate properties - voids ratio and bulk density, Aggregate properties ...

Aggregate properties 1.Aim: To compare the bulk density, voids ratio and angularity number of a nominal single sized aggregate when subjected to different levels of compaction

Measurement uncertainty, Real measurements never deliver the true value of ...

Real measurements never deliver the true value of the physical quantity or measurand. The measurement uncertainty consists of a random error and a systematic error. Most of the err

How will you make finance forecasting ?, how will you make finance forecast...

how will you make finance forecasting ? First I will evaluation the past seasons fiscal reports to get an Idea about the economical functions. Then will talk about with the cont

Opration research, a note on tracing a closed loop. What are the characteri...

a note on tracing a closed loop. What are the characteristic features of a closed loop?(

Chaplets, Q. Explain the Chaplets.                                    ...

Q. Explain the Chaplets.                                                       OR  When are chaplets required in moulding practice? What is the material of the chaplets?

What features of our solar system, Expertsmind.com brings you unique solut...

Expertsmind.com brings you unique solution in physics What features of our solar system provide clues to how it formed? 1- Patterns of motions among large bodies: -

Aeroengine - velocity trinagle, If radial velocity is neglected, for a stat...

If radial velocity is neglected, for a stat or there is no change from the cascade analysis. For a rotor this vectorial For a rotor this vectorial addition gives rise to graphical

Power system analysis, I need a project in Load impact in power flow((const...

I need a project in Load impact in power flow((constant power, constant impedance, constant current, induction motor). Report from 3 articles source and simulation in powerworld s

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

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

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