Aircraft Structural Analysis (Omar) -

7/27/2019 Aircraft Structural Analysis (Omar) -

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Aerospace Engineering Department

KFUPM

Aircraft Structural Analysis

by

Dr. Hanafy Omar


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Function of the Aircraft Structure

The basic functions of an aircrafts structure are to

Resist the applied loads

Provide the aerodynamic shape

Protect passengers, payload, systems, etc from the

environmental conditions encountered in the flight


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Aircraft Structure Components

1. Wing

2. Fuselage

3. Empennage (Vertical and Horizontal Tail)

4. Under Carriage (Landing Gear)

5. Engine MountsWing

Fuselage

Under Carriage

Vertical Tail

Horizontal Tail


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stringer

Frame

Skin

Internal Aircraft Structural Components

Fuselage

For the conventional fuselage, the major

structural elements are:

Transverse Frame

Longitudinal Stringers

Longerons (primary stringers)

Skin


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Internal Aircraft Structural Components

Wing

For the conventional wing, the major

structural elements are:

Spars (transmitting most of the

bending load arising from the

aircraft weight)

Ribs (defines the aerodynamic

shape of the wing)

Skin

Empennage has the same

structure as Wing


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Stress


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Shear Stress


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Finite Element Analysis

Node

Element


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Two Dimensional Elements

2D plate elements are used to model thin structural members

such as aircraft fuselage skin


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Aircraft Wing Modal Analysis

Using Ansys

Ansys Model


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Aircraft Wing Modal Analysis using Ansys

First Mode Third ModeSecond Mode

Fourth Mode Fifth Mode


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Questions

Aircraft Structural Analysis (Omar) -

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