Please boost your Plan to download papers

#
Essay sample - Flutter Velocity

Essay

Science

Pages 2 (502 words)

1. Flutter is a dynamic instability of an elastic body (wing or fin) in an airstream and like divergence the only forces necessary to produce flutter are those due to the deflection of an elastic structure from its initially un-deformed state.

2. The flutter velocity or critical speed UF and frequency 'F are defined respectively as the lowest airspeed and corresponding circular frequency at which an elastic body flying at a given atmospheric pressure and temperature will exhibit sustained harmonic oscillation.

…

Get more done in less time

Let us write a custom essay on your topic

“Flutter Velocity” with a personal
15% discount.

Order now
## Introduction

10. Please note the two equations presented here are an approximation based on steady flow flutter assumptions and are only valid for ''/'h > 1 and mass ratio (') < 10. Where, ''/'h is the ratio of the natural torsion frequency to the natural bending frequency.

The discussion in the previous section of the Pines' flutter velocity approximation (used on the main screen) is based on quasi-steady aerodynamic assumptions. Therefore, as stated in An Introduction to the Theory of Elasticity, the Pines' approximation is practical for determining flutter velocity of low speed aircraft and model rockets. However, high speed aircraft and model rockets require the linearized aerodynamic theory represented by Theodoren's function, F(k) + i G(k) and implemented on the new Torsion-Flexure (2-D) Unsteady Flutter analysis screen in FinSim 4. ...

Download paper
Not exactly what
you need?

### Related papers

Multiphase Environmental Flows
The other method involves the use of Eulerian/ Lagrangian method in which the particles are treated individually or as a group tracked by the Lagrangian frame of reference. Cundall and Starck developed the discrete element method in 1979 and has been widely used for the study of parcticles in the solid state. Studies conducted using DEM coupled with CFD showed that particles move in plugs along…

Ground Reaction Force
The discussion includes the explanation of the general pattern of the Fz- and Fy- time traces an dthe change in magnitude of the Ground Reaction Force (GRF) variables between each running speed.…

Hip Flexion
The linear velocity of the centre of mass of the rotating foot hitting the ball is directly proportional to the product of the angular velocity and the radius of rotation of the consecutive body segments and the linear velocity of the hip joint. The timing of these rotational movements is important for the impact of the foot with the ball. Putnam (1983) used the time between peak angular velocity…

Calculated Versus Observed Underwater Sound Speed
The speed of sound in air is approximately figured out by the formula . . . speed of sound (m/s) = 331.5 + 0.60 T(C). The speed or velocity, at which sound travels through water was first researched by Sir Isaac Newton in 1687 when he found that measurements of sound in fluids relied only on the physical properties of the fluid, such as elasticity and density (Funk & Wagnalls). The speed of sound…

Sonar Performances
This project entails the planning and execution of an oceanographic survey to determine the differences in sound velocity variables over the neap and spring tide cycles in the Dart and Tamar estuaries, and their impact on sonar-related performances. This study is largely based on research provided by Desiree Batton in conjunction with the Hydrographic Society, The Dart Observatory at the Britannia…