Introduction to aircraft aeroelasticity and loads / Jan R. Wright, Jonathan E. Cooper.

Format:

Book

Author/Creator:

Wright, Jan R., author.

Cooper, Jonathan E., author.

Series:

Aerospace series (Chichester, England).

THEi Wiley ebooks.

Aerospace series

THEi Wiley ebooks

Language:

English

Subjects (All):

Aeroelasticity.

Physical Description:

1 online resource (543 p.)

Edition:

Second edition.

Place of Publication:

Chichester, West Sussex, England : John Wiley & Sons Inc., [2015]

Language Note:

English

System Details:

Access using campus network via VPN at home (THEi Users Only).

Summary:

Introduction to Aircraft Aeroelasticity and Loads, Second Edition is an updated new edition offering comprehensive coverage of the main principles of aircraft aeroelasticity and loads. For ease of reference, the book is divided into three parts and begins by reviewing the underlying disciplines of vibrations, aerodynamics, loads and control, and then goes on to describe simplified models to illustrate aeroelastic behaviour and aircraft response and loads for the flexible aircraft before introducing some more advanced methodologies. Finally, it explains how industrial certification requirements for aeroelasticity and loads may be met and relates these to the earlier theoretical approaches used. Key features of this new edition include: * Uses a unified simple aeroelastic model throughout the book * Major revisions to chapters on aeroelasticity * Updates and reorganisation of chapters involving Finite Elements * Some reorganisation of loads material * Updates on certification requirements * Accompanied by a website containing a solutions manual, and MATLAB® and SIMULINK® programs that relate to the models used Introduction to Aircraft Aeroelasticity and Loads, Second Edition is a must-have reference for researchers and practitioners working in the aeroelasticity and loads fields, and is also an excellent textbook for senior undergraduate and graduate students in aerospace engineering.

Contents:

Intro

Title Page

Copyright Page

Contents

Series Preface

Preface to the Second Edition

Preface to the First Edition

Abbreviations

Introduction

Part I Background Material

Chapter 1 Vibration of Single Degree of Freedom Systems

1.1 Setting up Equations of Motion for SDoF Systems

1.1.1 Example: Classical SDoF System

1.1.2 Example: Aircraft Control Surface

1.2 Free Vibration of SDoF Systems

1.2.1 Example: Aircraft Control Surface

1.3 Forced Vibration of SDoF Systems

1.4 Harmonic Forced Vibration - Frequency Response Functions

1.4.1 Response to Harmonic Excitation

1.4.2 Frequency Response Functions

1.4.3 Hysteretic (or Structural) Damping

1.5 Transient/Random Forced Vibration - Time Domain Solution

1.5.1 Analytical Approach

1.5.2 Principle of Superposition

1.5.3 Example: Single Cycle of Square Wave Excitation - Response Determined by Superposition

1.5.4 Convolution Approach

1.5.5 Direct Solution of Ordinary Differential Equations

1.5.6 Example: Single Cycle of Square Wave Excitation - Response Determined by Numerical Integration

1.6 Transient Forced Vibration - Frequency Domain Solution

1.6.1 Analytical Fourier Transform

1.6.2 Frequency Domain Response - Excitation Relationship

1.6.3 Example: Single Cycle of Square Wave Excitation - Response Determined via Fourier Transform

1.7 Random Forced Vibration - Frequency Domain Solution

1.8 Examples

Chapter 2 Vibration of Multiple Degree of Freedom Systems

2.1 Setting up Equations of Motion

2.2 Undamped Free Vibration

2.2.1 Direct Approach

2.2.2 Eigenvalue Approach

2.2.3 Example: `Chain-like´ 2DoF System

2.3 Damped Free Vibration

2.3.1 Example: 2DoF `Chain-Like´ System with Proportional Damping

2.3.2 Example: 2DoF `Chain-Like´ System with Non-proportional Damping.

2.4 Transformation to Modal Coordinates

2.4.1 Modal Coordinates

2.4.2 Example: 2DoF `Chain-like´ System with Proportional Damping

2.4.3 Example: 2DoF `Chain-like´ System with Non-proportional Damping

2.4.4 Mode Shape Normalization

2.4.5 Meaning of Modal Coordinates

2.4.6 Dimensions of Modal Coordinates

2.4.6.1 Consistent Coordinates

2.4.6.2 Mixed Coordinates

2.4.7 Model Order Reduction

2.5 Two-DoF Rigid Aircraft in Heave and Pitch

2.6 `Free-Free´ Systems

2.7 Harmonic Forced Vibration

2.7.1 Equations in Physical Coordinates

2.7.2 Equations in Modal Coordinates

2.8 Transient/Random Forced Vibration - Time Domain Solution

2.8.1 Analytical Approach

2.8.2 Convolution Approach

2.8.3 Solution of Ordinary Differential Equations

2.9 Transient Forced Vibration - Frequency Domain Solution

2.10 Random Forced Vibration - Frequency Domain Solution

2.11 Examples

Chapter 3 Vibration of Continuous Systems - Assumed Shapes Approach

3.1 Continuous Systems

3.2 Modelling Continuous Systems

3.3 Elastic and Flexural Axes

3.4 Rayleigh-Ritz `Assumed Shapes´ Method

3.4.1 One-dimensional Systems

3.4.2 Two-dimensional Systems

3.4.3 Choice of Assumed Shapes

3.4.4 Normal Modes for a Continuous System

3.5 Generalized Equations of Motion - Basic Approach

3.5.1 Clamped-Free Member in Bending - Single Assumed Shape

3.5.2 Clamped-Free Member in Bending - Two Assumed Shapes

3.5.3 Clamped-Free Member in Torsion - One Assumed Shape

3.6 Generalized Equations of Motion - Matrix Approach

3.6.1 Representation of Deformation

3.6.2 Kinetic Energy

3.6.3 Elastic Potential Energy

3.6.4 Incremental Work Done

3.6.5 Differentiation of Lagrange´s Equations in Matrix Form

3.7 Generating Whole Aircraft `Free-Free´ Modes from `Branch´ Modes

3.8 Whole Aircraft `Free-Free´ Modes.

3.9 Examples

Chapter 4 Introduction to Steady Aerodynamics

4.1 The Standard Atmosphere

4.2 Effect of Air Speed on Aerodynamic Characteristics

4.2.1 Mach Number

4.2.2 Reynolds Number

4.2.3 Inviscid/Viscous and Incompressible/Compressible Flows

4.2.4 Dynamic Pressure

4.3 Flows and Pressures Around a Symmetric Aerofoil

4.4 Forces on an Aerofoil

4.5 Variation of Lift for an Aerofoil at an Angle of Incidence

4.6 Pitching Moment Variation and the Aerodynamic Centre

4.7 Lift on a Three-dimensional Wing

4.7.1 Wing Dimensions

4.7.2 Lift Curve Slope of a Three-dimensional Wing

4.7.3 Force and Moment Coefficients for a Three-dimensional Wing

4.7.4 Strip Theory for a Continuous Wing

4.7.5 Strip Theory for a Discretized Wing

4.7.6 Panel Methods

4.8 Drag on a Three-dimensional Wing

4.9 Control Surfaces

4.10 Transonic Flows

4.11 Examples

Chapter 5 Introduction to Loads

5.1 Laws of Motion

5.1.1 Newton´s Laws of Motion for a Particle

5.1.2 Generalized Newton´s Laws of Motion for a Body

5.1.2.1 Translation

5.1.2.2 Rotation

5.1.3 Units

5.2 D´Alembert´s Principle - Inertia Forces and Couples

5.2.1 D´Alembert´s Principle for a Particle

5.2.2 Application of d´Alembert´s Principle to a Body

5.2.3 Extension to Distributed Inertia Forces

5.2.3.1 Translation

5.2.3.2 Rotation

5.3 External Loads - Applied and Reactive

5.3.1 Applied Loads

5.3.2 Reactive Loads (Reactions)

5.4 Free Body Diagrams

5.5 Internal Loads

5.6 Internal Loads for a Continuous Member

5.6.1 Internal Loads for Uniformly Distributed Loading

5.6.1.1 `Exposing´ Internal Loads

5.6.1.2 Determining Internal Loads via Equilibrium of `Cut´ Sections

5.6.1.3 Other Boundary Conditions

5.6.2 Internal Loads for Non-uniformly Distributed Loading.

5.6.2.1 Distributed Inertia Forces for a Continuous Member

5.6.2.2 Internal Loads for a Continuous Member under Non-uniform Loading

5.7 Internal Loads for a Discretized Member

5.7.1 Distributed Inertia Forces for a Discretized Member

5.7.2 Internal Loads for a Discretized Member

5.8 Intercomponent Loads

5.9 Obtaining Stresses from Internal Loads - Structural Members with Simple Load Paths

5.10 Examples

Chapter 6 Introduction to Control

6.1 Open and Closed Loop Systems

6.2 Laplace Transforms

6.2.1 Solution of Differential Equations using Laplace Transforms

6.3 Modelling of Open and Closed Loop Systems using Laplace and Frequency Domains

6.4 Stability of Systems

6.4.1 Poles and Zeros

6.4.2 Routh-Hurwitz Method

6.4.3 Frequency Domain Representation

6.4.3.1 Root Locus

6.4.3.2 Stability Analysis using Nyquist and Bode Plots

6.4.4 Time Domain Representation

6.4.4.1 State Space Representation

6.5 PID Control

6.6 Examples

Part II Introduction to Aeroelasticity and Loads

Chapter 7 Static Aeroelasticity - Effect of Wing Flexibility on Lift Distribution and Divergence

7.1 Static Aeroelastic Behaviour of a Two-dimensional Rigid Aerofoil with a Torsional Spring Attachment

7.1.1 Iterative Approach

7.1.1.1 First Iteration

7.1.1.2 Further Iterations

7.1.2 Direct (Single Step) Approach

7.2 Static Aeroelastic Behaviour of a Fixed Root Flexible Wing

7.2.1 Twist and Divergence of the Fixed Root Flexible Wing

7.2.2 Variation of Lift Along the Fixed Root Flexible Wing

7.3 Effect of Trim on Static Aeroelastic Behaviour

7.3.1 Effect of Trim on the Divergence and Lift Distribution for a Simple Aircraft Model

7.3.2 Effect of Trim on the Variation of Lift along the Wing

7.3.3 Effect of Trim on the Wing and Tailplane Lift.

7.4 Effect of Wing Sweep on Static Aeroelastic Behaviour

7.4.1 Effect of Wing Sweep on Effective Angle of Incidence

7.4.2 Effective Streamwise Angle of Incidence due to Bending/Twisting

7.4.3 Effect of Sweep Angle on Divergence Speed

7.4.5 Comments

7.5 Examples

Chapter 8 Static Aeroelasticity - Effect of Wing Flexibility on Control Effectiveness

8.1 Rolling Effectiveness of a Flexible Wing - Fixed Wing Root Case

8.1.1 Determination of Reversal Speed

8.1.2 Rolling Effectiveness - Rigid Fixed Wing Root Case

8.2 Rolling Effectiveness of a Flexible Wing - Steady Roll Case

8.2.1 Determination of Reversal Speed for Steady Roll Case

8.2.2 Lift Distribution for the Steady Roll Case

8.3 Effect of Spanwise Position of the Control Surface

8.4 Full Aircraft Model - Control Effectiveness

8.5 Effect of Trim on Reversal Speed

8.6 Examples

Chapter 9 Introduction to Unsteady Aerodynamics

9.1 Quasi-steady Aerodynamics

9.2 Unsteady Aerodynamics related to Motion

9.2.1 Instantaneous Change in Angle of Incidence - Wagner Function

9.2.2 Harmonic Motion - Convolution using the Wagner Function

9.2.3 Harmonic Motion using the Theodorsen Function

9.3 Aerodynamic Lift and Moment for an Aerofoil Oscillating Harmonically in Heave and Pitch

9.4 Oscillatory Aerodynamic Derivatives

9.5 Aerodynamic Damping and Stiffness

9.6 Approximation of Unsteady Aerodynamic Terms

9.7 Unsteady Aerodynamics related to Gusts

9.7.1 Lift due to a Sharp-Edged Gust - Küssner Function

9.7.2 Lift due to a Sinusoidal Gust - Sears Function

9.8 Examples

Chapter 10 Dynamic Aeroelasticity - Flutter

10.1 Simplified Unsteady Aerodynamic Model

10.2 Binary Aeroelastic Model

10.2.1 Aeroelastic Equations of Motion

10.3 General Form of the Aeroelastic Equations

10.4 Eigenvalue Solution of the Flutter Equations.

10.5 Aeroelastic Behaviour of the Binary Model.

Notes:

Previous ed.: 2007.

Includes bibliographical references and index.

Description based on print version record.

ISBN:

9781118700433

1118700430

9781118700440

1118700449

9781118700426

1118700422

OCLC:

898769287