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

Turbo shaft engines - aircraft engine , Turbo shaft engines : Gas turbi...

Turbo shaft engines : Gas turbine engines that deliver power through a shaft to operate something other than a propeller are referred to as turboshaft engines. In most cases th

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

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

Determine payback and npv, Payback & NPV Julia Corp. is in the business o...

Payback & NPV Julia Corp. is in the business of making sugar cookies. The company is considering the purchase of a new cookie making machine which will improve its manufacturing

Zeroth law of thermodymanics, Explain with the aid of sketch of zeroth law ...

Explain with the aid of sketch of zeroth law of thermodynamics

Classifications of moulding sands, 1. Generally moulding sands can be class...

1. Generally moulding sands can be classified as:           (a) Natural Sand           (b) Synthetic or High Silica Sand           (c) Chemically Coated Sand

Survey, Operations invending in chain survey

Operations invending in chain survey

Static and dynamic balancing - propellers, STATIC & DYNAMIC BALANCING ...

STATIC & DYNAMIC BALANCING STATIC BALANCE When the weight distribution about the propeller axis is equal, with the propeller in any position, it is said to have static bal

Discuss the heuristic search as applied to an and/or graph, Question 1 Wha...

Question 1 What is Artificial Intelligence? Discuss the two class of approaches followed for AI Question 2 Discuss the heuristic search as applied to an AND/OR Graph Ques

Smoke control system, Smoke control system: Where smoke control is ins...

Smoke control system: Where smoke control is installed in a building it is usual for there to also be sprinkler protection to the building and its contents.  This is necessary

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