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Introduction to Aircraft Aeroelasticity and Loads

ISBN-10: 0470858400
ISBN-13: 9780470858400
Edition: 2006
List price: $170.00
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Description: This excellent new textbook covers the range of aero elastic and dynamic loads topics (whilst also providing an understanding of the principles involved) without the inclusion of complicated mathematics. Many tutors/lecturers in the field feel that  More...

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Book details

List price: $170.00
Copyright year: 2006
Publisher: John Wiley & Sons, Incorporated
Publication date: 1/22/2008
Binding: Hardcover
Pages: 526
Size: 7.00" wide x 9.75" long x 1.25" tall
Weight: 2.332
Language: English

This excellent new textbook covers the range of aero elastic and dynamic loads topics (whilst also providing an understanding of the principles involved) without the inclusion of complicated mathematics. Many tutors/lecturers in the field feel that it is not appropriate to give the 'classical' books (published in the 50's and 60's) to new graduate engineers, as they are too theoretical for novices, over length, out of date and not easily accessible. As an introduction to aircraft aero elasticity and dynamic loads, this book will not only be welcomed by junior practitioners in industry and graduate students, it will also form an excellent basis for several university courses on aero elasticity. Features: Breadth of coverage of aero elasticity and dynamics loads Up-to-date analysis and experimental methods Reduced mathematical content

Preface
Introduction
Abbreviations
Background Material
Vibration of Single Degree of Freedom Systems
Setting up equations of motion for single DoF systems
Free vibration of single DoF systems
Forced vibration of single DoF systems
Harmonic forced vibration - frequency response functions
Transient/random forced vibration - time domain solution
Transient forced vibration - frequency domain solution
Random forced vibration - frequency domain solution
Examples
Vibration of Multiple Degree of Freedom Systems
Setting up equations of motion
Undamped free vibration
Damped free vibration
Transformation to modal coordinates
'Free-free' systems
Harmonic forced vibration
Transient/random forced vibration - time domain solution
Transient forced vibration - frequency domain solution
Random forced vibration - frequency domain solution
Examples
Vibration of Continuous Systems - Assumed Shapes Approach
Rayleigh-Ritz 'assumed shapes' method
Generalized equations of motion - basic approach
Generalized equations of motion - matrix approach
Generating aircraft 'free-free' modes from 'branch' modes
Whole aircraft 'free-free' modes
Examples
Vibration of Continuous Systems - Discretization Approach
Introduction to the finite element (FE) approach
Formulation of the beam bending element
Assembly and solution for a structure with beam elements
Torsion element
Combined bending/torsion element
Comments on modelling
Examples
Introduction to Steady Aerodynamics
The standard atmosphere
Effect of air speed on aerodynamic characteristics
Flows and pressures around a symmetric aerofoil
Forces on an aerofoil
Variation of lift for an aerofoil at an angle of incidence
Pitching moment variation and the aerodynamic centre
Lift on a three-dimensional wing
Drag on a three-dimensional wing
Control surfaces
Supersonic aerodynamics - piston theory
Transonic flows
Examples
Introduction to Loads
Laws of motion
D'Alembert's principle - inertia forces and couples
Externally applied/reactive loads
Free body diagrams
Internal loads
Internal loads for continuous representation of a structure
Internal loads for discretized representation of a structure
Intercomponent loads
Obtaining stresses from internal loads - structural members with simple load paths
Examples
Introduction to Control
Open and closed loop systems
Laplace transforms
Modelling of open and closed loop systems using Laplace and frequency domains
Stability of systems
PID control
Examples
Introduction to Aeroelasticity and Loads
Static Aeroelasticity - Effect of Wing Flexibility on Lift Distribution and Divergence
Static aeroelastic behaviour of a two-dimensional rigid aerofoil with spring attachment
Static aeroelastic behaviour of a fixed root flexible wing
Effect of trim on static aeroelastic behaviour
Effect of wing sweep on static aeroelastic behaviour
Examples
Static Aeroelasticity - Effect of Wing Flexibility on Control Effectiveness
Rolling effectiveness of a flexible wing - the steady roll case
Rolling effectiveness of a flexible wing - the fixed wing root case
Effect of spanwise position of the control surface
Full aircraft model - control effectiveness
Effect of trim on reversal speed
Examples
Introduction to Unsteady Aerodynamics
Quasi-steady aerodynamics
Unsteady aerodynamics
Aerodynamic lift and moment for a harmonically oscillating aerofoil
Oscillatory aerodynamic derivatives
Aerodynamic damping and stiffness
Unsteady aerodynamics related to gusts
Examples
Dynamic Aeroelasticity - Flutter
Simplified unsteady aerodynamic model
Binary aeroelastic model
General form of the aeroelastic equations
Eigenvalue solution of flutter equations
Aeroelastic behaviour of the binary model
Aeroelastic behaviour of a flexible wing
Aeroelastic behaviour of a multiple mode system
Flutter speed prediction for binary systems
Flutter conic
Divergence of aeroelastic systems
Inclusion of unsteady reduced frequency effects
Control surface flutter
Whole aircraft model - inclusion of rigid body modes
Flutter in the transonic regime
Flutter in the supersonic regime - wing and panel flutter
Effect of nonlinearities - limit cycle oscillations
Examples
Aeroservoelasticity
Mathematical modelling of a simple aeroelastic system with a control surface
Inclusion of gust terms
Implementation of a control system
Determination of closed loop system stability
Gust response of the closed loop system
Inclusion of control law frequency dependency in stability calculations
Response determination via the frequency domain
State space modelling
Examples
Equilibrium Manoeuvres
Equilibrium manoeuvre - rigid aircraft under normal acceleration
Manoeuvre envelope
Equilibrium manoeuvre - rigid aircraft pitching
Equilibrium manoeuvre - flexible aircraft pitching
Flexible corrections to rigid aircraft pitching derivatives
Equilibrium manoeuvres - aircraft rolling and yawing
Representation of the flight control system (FCS)
Examples
Flight Mechanics Model for Dynamic Manoeuvres
Aircraft axes
Motion variables
Axes transformations
Velocity and acceleration components for moving axes
Flight mechanics equations of motion for a rigid aircraft
Representation of disturbing forces and moments
Equations for flexible aircraft in longitudinal motion
Solution of flight mechanics equations
Flight control system (FCS)
Dynamic Manoeuvres
Dynamic manoeuvre - rigid aircraft heave/pitch due to elevator input
Dynamic manoeuvre - flexible aircraft heave/pitch due to elevator input
General form of longitudinal equations
Dynamic manoeuvre - rigid aircraft roll due to aileron input
Dynamic manoeuvre - flexible aircraft roll due to aileron input
Flexible corrections to flight mechanics equations
Representation of the flight control system (FCS)
Examples
Gust and Turbulence Encounters
Gusts and turbulence
Gust response in the time domain
Time domain gust response - rigid aircraft in heave
Time domain gust response - rigid aircraft in heave/pitch
Time domain gust response - flexible aircraft
General form of equations in the time domain
Turbulence response in the frequency domain
Frequency domain turbulence response - rigid aircraft in heave
Frequency domain turbulence response - rigid aircraft in heave/pitch
Frequency domain turbulence response - flexible aircraft
General form of equations in the frequency domain
Representation of the flight control system (FCS)
Examples
Ground Manoeuvres
Landing gear
Taxi, take-off and landing roll
Landing
Braking
'Spin-up' and 'spring-back' condition
Turning
Shimmy
Representation of the flight control system (FCS)
Examples
Aircraft Internal Loads
Limit and ultimate loads
Internal loads for an aircraft
General internal loads expressions - continuous wing
Effect of wing-mounted engines/landing gear
Internal loads - continuous flexible wing
General internal loads expressions - discretized wing
Internal loads - discretized fuselage
Internal loads - continuous turbulence encounter
Loads generation and sorting to yield critical cases
Aircraft dimensioning cases
Stresses from internal loads - complex load paths
Examples
Potential Flow Aerodynamics
Elements of inviscid, incompressible flow analysis
Inclusion of vorticity
Numerical steady aerodynamic modelling of thin two-dimensional aerofoils
Steady aerodynamic modelling of three-dimensional wings using a panel method
Unsteady aerodynamic modelling of wings undergoing harmonic motion
AICs in modal space
Examples
Coupling of Structural and Aerodynamic Computational Models
Mathematical modelling - static aeroelastic case
Two-dimensional coupled static aeroelastic model - pitch
Two-dimensional coupled static aeroelastic model - heave/pitch
Three-dimensional coupled static aeroelastic model
Mathematical modelling - dynamic aeroelastic response
Two-dimensional coupled dynamic aeroelastic model - bending and torsion
Three-dimensional flutter analysis
Inclusion of frequency-dependent aerodynamics for state space modelling - rational fraction approximation
Introduction to Industrial Practice
Aircraft Design and Certification
Aeroelastics and loads in the aircraft design process
Aircraft certification process
Aeroelasticity and Loads Models
Structural model
Aerodynamic model
Flight control system
Other model issues
Loads transformations
Static Aeroelasticity and Flutter
Static aeroelasticity
Flutter
Flight Manoeuvre and Gust/Turbulence Loads
Evaluation of internal loads
Equilibrium/balanced flight manoeuvres
Dynamic flight manoeuvres
Gusts and turbulence
Ground Manoeuvre Loads
Aircraft/landing gear models for ground manoeuvres
Landing gear/airframe interface
Ground manoeuvres - landing
Ground manoeuvres - ground handling
Loads processing
Testing Relevant to Aeroelasticity and Loads
Introduction
Wind tunnel tests
Ground vibration test
Structural coupling test
Flight simulator test
Structural tests
Flight flutter test
Flight loads validation
Appendices
Aircraft Rigid Body Modes
Rigid body translation modes
Rigid body rotation modes
Table of Longitudinal Aerodynamic Derivatives
Aircraft Symmetric Flexible Modes
Aircraft model
Symmetric free-free flexible mode
Model Condensation
Introduction
Static condensation
Dynamic condensation - Guyan reduction
Static condensation for aeroelastic models
Modal condensation
Modal reduction
Aerodynamic Derivatives in Body Fixed Axes
Longitudinal derivative Z[subscript w]
Lateral derivatives L[subscript p], L[subscript xi]
Aircraft Antisymmetric Flexible Modes
Aircraft model
Antisymmetric free-free flexible modes
References
Index
Programs Accessible (on the Companion Website) via the Internet
MATLAB/SIMULINK Programs for Vibration
Forced response of an SDoF system
Modal solution for an MDoF system
Finite element solution
MATLAB/SIMULINK Programs for Flutter
Dynamic aeroelastic calculations
Aeroservoelastic system
MATLAB/SIMULINK Programs for Flight/Ground Manoeuvres and Gust/Turbulence Encounters
Rigid aircraft data
Flexible aircraft data
Flight case data
Aerodynamic derivative calculation
Equilibrium manoeuvres
Dynamic manoeuvres
Gust response in the time domain
Gust response in the frequency domain
Ground manoeuvres

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