A modern course in aeroelasticity

828 Pages·2022·18.176 MB·English

by  E. H. Dowell (editor)

Solid Mechanics and Its Applications
Earl H. Dowell   Editor
A Modern
Course in
Aeroelasticity
Sixth Edition
Solid Mechanics and Its Applications
Founding Editor
G. M. L. Gladwell
Volume 264
Series Editors
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Arbor, MI, USA
Anders Klarbring, Mechanical Engineering, Linköping University, Linköping,
Sweden
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Earl H. Dowell
Editor
A Modern Course
in Aeroelasticity
Sixth Edition
123
Editor
EarlH.Dowell
Department ofMechanical Engineering
andMaterials Science
Duke University
Durham, NC,USA
ISSN 0925-0042 ISSN 2214-7764 (electronic)
Solid MechanicsandIts Applications
ISBN978-3-030-74235-5 ISBN978-3-030-74236-2 (eBook)
https://doi.org/10.1007/978-3-030-74236-2
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Preface to the Sixth Edition
For the last several years, the lectures in the course on Aeroelasticity at Duke
Universityhavebeenrecordedandthoseareavailabletoreadersofthisbookupon
request.
At the end of the 2020 spring semester, each of my then Ph.D. students, Dani
Levin, Kevin McHugh, Maxim Freydin, Michael Lee, and also my faculty col-
league, Jeff Thomas, presented lectures on their current research interests. I know
youwillenjoytheirpresentationsasIdidonthe(1)theuseoftheZEROcomputer
code for aeroelastic analysis, (2) hypersonic fluid-structure interaction, (3) the
constructionofReducedOrderModelsfortheNavier–Stokesequationsand(4)the
use of harmonic balance methods for nonlinear aeroelastic analysis. My own lec-
tures largely covered the first four chapters of the book, “A Modern Course in
Aeroelasticity”, using the fifth edition. For this sixth edition, the first twelve
chapters of the latest edition are largely unchanged except for the correction of
most, if not all, of the typos that appear in the fifth edition. The first homework
assignment for the aeroelasticity course last spring was to find the typos in the
chapterStaticAeroelasticity.SubsequenthomeworkcoveredthechaptersDynamic
Aeroelasticity and Nonsteady Aerodynamics of Lifting and Non-lifting Surfaces
andasummerreadingcoursewithoneofthePh.D.studentsinthecourse,Richard
Hollenbach, led to typos in the later chapters Stall Flutter–Some Recent Advances
in Nonlinear Aeroelasticity, being identified and corrected. Also, the chapters
Modern Analysis for Complex and Nonlinear Unsteady Flows in Turbomachinery
and Some Recent Advances in Nonlinear Aeroelasticity have been modestly
revised.
The experimental videos that appear on the Aeroelasticity website at Duke
University are discussed extensively in the chapter Aeroelastic Models Design/
Experiment and Correlation with New Theory, a new chapter of the sixth edition,
andrepresentabout20yearsofaeroelasticityexperimentsconductedonarangeof
nonlinearaeroelasticmodelsatDukeUniversity.MuchofthisworkwasledbyDr.
Deman Tang. The chapter Aeroelastic Models Design/Experiment and Correlation
with New Theory complements the chapter Experimental Aeroelasticity which
providesanintroductiontoexperimentalmethodsthathavetraditionallybeenused
v
vi PrefacetotheSixthEdition
based upon the concepts of linear aeroelastic models. Also, in the sixth edition
of the book, a chapter on hypersonic aeroelasticity or fluid structural thermal
dynamics interaction(FSTDI), the chapter Fluid/Structural/Thermal/Dynamics
Interaction (FSTDI) in Hypersonic Flow, is included with contributions from
KevinMcHughandMaximFreydin.Currently,hypersonicaeroelasticityorFSTDI
is a particularly active area of research and development including a number of
fascinating experimental programs at several universities and governmental labo-
ratories.Anoverviewofthesecurrentandprospectiveprogramsisgivenincluding
anassessmentofthestateoftheartandtheidentificationofoutstandingchallenges.
The Duke University Aeroelasticity Team hopes that you will enjoy all of this
old and new material. Special acknowledgement and appreciation are extended to
Dr. Deman Tang and Dr. Dani Levin for their contributions to the new edition
of the book and to the Aeroelasticity website, respectively.
Durham, USA Earl H. Dowell
Preface to the Fifth Edition
In this fifth edition, a new chapter is added, Chap. 14, Some Recent Advances in
Nonlinear Aeroelasticity: Fluid-Structure Interaction in the Twenty-First Century,
with a discussion of some of the most recent research results that have been
obtained in the last decade. Also, a new author and distinguished colleague, Dr.
Deman Tang, has joined us. And the opportunity has been taken to correct all the
typographical errors that we and our readers have found.
With this edition, the first author is making available upon request video/audio
recordings of his semester-long lectures that cover Chaps. 1-4 as well as selected
lectures on current research topics. It is planned to continually update these
video/audio lectures and these updates will also be made available to those to
purchasethenewedition.Alsoavailablearelecturenotesandadditionalhomework
problems and their solutions augmenting those already included in the text.
Earl H. Dowell
vii
Preface to the Fourth Edition
In this edition, several new chapters have been added and others substantially
revised and edited. Chapter 6 on Aeroelasticity in Civil Engineering originally
authored by Robert Scanlan has been substantially revised by his close colleague,
Emil Simiu. Chapter 9 on Modeling of Fluid-Structure Interaction by Earl Dowell
andKennethHallisentirelynewanddiscussesmodernmethodsfortreatinglinear
and nonlinear unsteady aerodynamics based upon computational fluid dynamics
modelsandtheirsolutions.Chapter11byEarlDowell,JohnEdwardsandThomas
Strganac on Nonlinear Aeroelasticity is also new and provides a review of recent
results. Chapter 12 by Robert Clark and David Cox on Aeroelastic Control is also
newandprovidesanauthoritativeaccountofrecentdevelopments.Finally,Chapter
13 by Kenneth Hall on Modern Analysis for Complex and Nonlinear Unsteady
Flows in Turbomachinery is also new and provides an insightful and unique
account of this important topic. Many other chapters have been edited for greater
clarity as well and author and subject indices are also provided.
Dr. Deman Tang has provided invaluable contributions tothe productionof the
text and all of the authors would like to acknowledge his efforts with great
appreciation.
Earl H. Dowell
ix
Preface to the Third Edition
The authors would like to thank all those readers of the first and second editions
who have written with comments and suggestions. In the third edition, the
opportunity has been taken to revise and update Chapters 1 to 9. Also, three new
chapters have been added, i.e., Chapter 10, Experimental Aeroelasticity; Chapter
11, Nonlinear Aeroelasticity and Chapter 12, Aeroelastic Control. Chapter 10 is a
brief introduction to a vast subject; Chapter 11 is an overview of a frontier of
researchandChapter12isthefirstconnected,authoritativeaccountofthefeedback
controlofaeroelasticsystems.Chapter12meetsasignificantneedintheliterature.
Theauthorsofthefirstandsecondeditionswelcometwonewauthors,DavidPeters
who has provided a valuable revision of Chapter 7 on rotorcraft and Edward
CrawleywhohasprovidedChapter12onaeroelasticcontrol.Itisaprivilegeanda
pleasuretohavethemasmembersoftheteam.TheauthorofChapter10wouldalso
like to acknowledge the great help he has received over the year from his distin-
guished colleague, Wilmer H. “Bill” Reed, III, in the study of experimental
aeroelasticity. Mr. Reed kindly provided the figures for Chapter 10. The author of
Chapter 12 would like to acknowledge the significant scholarly contribution of
Charrissa Lin and Ken Kazarus in preparing the chapter on aeroelastic control.
Finally, the readers of the first and second editions will note that the authors and
subject indices have been omitted from this edition. If any reader finds this an
inconvenience, please contact the editor and we will reconsider the matter for the
next edition.
Earl H. Dowell
xi