SIDDARTHA INSTITUTE OF

SCIENCE AND TECHNOLOGYPowerPoint presentation

on Case study on Aero

ElasticityBy

SANJANA P U

Aero elasticity is the study of the interaction of inertial, structural and aerodynamic forces on aircraft, buildings, surface vehicles etc.

INTRODUCTION

FIGURE : COLLARS TRIANGLE

AERO ELASTICITY

STATIC AEROELASTICITY

DIVERGENCE

CONTROL REVERSA

L

DYNAMIC AEROELASTICITY

FLUTTER BUFFETING TRANSONIC

Elastic twist of the wing suddenly becoming theoretically infinite

Phenomenon occurring only in wings with ailerons or other control surfaces, where control surfaces reverse their usual functionality

DIVERGENCE:

CONTROL REVERSAL:

STATIC AEROELASTICITY

Dynamic instability

FLUTTER:DYNAMIC AEROELASTICITY

BUFFETING: A high-frequency instability

Shock Waves

CASE STUDYBoeing X-53 Active Aero elastic Wing

First flight -8 December 2006 Role -Technology Demonstrator National origin -United States Manufacturer -McDonnell Douglas

Northrop Corporation

Active Aero elastic Wing

1 Design and development

Integrates wing aerodynamics, controls, and structure to harness and control wing aero elastic twist at high speeds and dynamic pressures.

Technology

An aircraft maneuvers - deploying flight control surfaces into the airflow, which modify the lift of the surface they are attached to.

1.1 Aero elasticity and controls

1.2 AAW testing1. Taking an existing F/A-18 airframe2. Modified with a preproduction pre roll

mod wing3. Added an outboard leading edge flap drive

system and an updated flight control computer

2 SpecificationsGeneral characteristics Crew: 1 Wingspan: 38 ft 5 in (11.71 m) Height: 15 ft 3 in (4.65 m) Max takeoff weight: 39,000 lb (17,690 kg) Power plant: 2 × General Electric F404-GE-400 low-

bypass turbofan engines, 16,000 lbf (71 KN) thrust each

Performance Maximum speed: 1,032 KN; 1,912 km/h (1,188

mph) Service ceiling: 50,000 ft (15,000 m)

Avionics

Aero elastic twist can be controlled Enables the use of high aspect ratio, thin,

swept wings Provide excellent high speed rolling

performance No additional stiffness was added for static

aero elastic issues Overall control authority is affected

Merits & Demerits

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