Vibro-Acoustics of Lightweight Sandwich Structures

350 Pages·2014·9.63 MB·English

by  Tianjian Lu

Springer Tracts in Mechanical Engineering
Tianjian Lu
Fengxian Xin
Vibro-Acoustics
of Lightweight
Sandwich Structures
Science Press
Beijing
Springer Tracts in Mechanical Engineering
Forfurthervolumes:
http://www.springer.com/series/11693

Tianjian Lu • Fengxian Xin
Vibro-Acoustics of
Lightweight Sandwich
Structures
123
TianjianLu
FengxianXin
Xi’anJiaotongUniversity
Xi’an
China
ISSN2195-9862 ISSN2195-9870(electronic)
ISBN978-3-642-55357-8 ISBN978-3-642-55358-5(eBook)
DOI10.1007/978-3-642-55358-5
SpringerHeidelbergNewYorkDordrechtLondon
JointlypublishedwithSciencePress,Beijing
ISBN:978-7-03-041322-2SciencePress,Beijing
LibraryofCongressControlNumber:2014942660
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Preface
The purpose of this book is to present the vibration and acoustical behavior of
typicalsandwichstructuressubjecttomechanicaland/oracousticalloadings,which
actuallyformaclassofstructuralelementsofpracticalimportanceinhugeamounts
ofengineeringapplications,suchasaircraftfuselage,shipandsubmarinehulls.The
contentsofthisbookhasgrownoutof the researchactivitiesof the authorsin the
fieldofsoundradiation/transmissionof/throughlightweightsandwichstructures.
Thebookisorganizedintosixchapters:Chapter1dealswiththevibro-acoustic
performance of rectangular multiple-panel partitions with enclosed air cavity
theoreticallyandexperimentally,whichhasaccountedforthesimplysupportedand
clamp supported boundary conditions. Chapter 2 concerns with the transmission
of externaljet-noise througha uniform skin plate of aircraft cabin fuselage in the
presence of external mean flow. As an extension, Chap. 3 handles with the noise
radiationandtransmissionfrom/throughaeroelasticskinplatesofaircraftfuselage
stiffened by orthogonally distributed rib-stiffeners in the presence of convected
meanflow.Chapter4developsatheoreticalmodelforsoundtransmissionthrough
all-metallic,two-dimensional,periodicsandwichstructureshavingcorrugatedcore.
Chapter 5 focuses on the sound radiation and transmission characteristics of
periodicallystiffened structures.Ultimately, Chap. 6 proposesthe soundradiation
and transmission behaviorsof periodicalsandwich structureshaving cavity-filling
fibroussoundabsorptivematerials.
Thisbookisinvolvingmultidisciplinarysubjectsespeciallyincludingcombined
knowledge of vibration, aeroelastics and structural acoustics, which pays much
attention on showing results and conclusions, in addition to mere theoretical
modelling.Thereforethisbookshouldbeofconsiderableinteresttoawiderangeof
readersinrelevantfields.Itishopedthatthecontentofthebookwillfindapplication
notonlyasatextbookforawideaudienceofengineeringstudents,butalsoageneral
referenceforresearchersinthefieldofvibrationsandacoustics.
Xi’an,China T.J.Lu
F.X.Xin
v

Acknowledgements
Althoughthe contents of this bookhas grown outof the research activities of the
authors, we would also like to deeply appreciate the reproduction permission for
figures, tables etc. from Elsevier, AIAA, ASME, Acoustical Society of America
and Taylor& Francis Ltd. These research activitiesare supportedby the National
BasicResearchProgramofChina(GrantNo.2011CB610300),theNationalNatural
Science Foundation of China (Grant Nos. 11102148, and 11321062) and the
FundamentalResearchFundsforCentralUniversities(xjj2011005).
vii

Contents
1 TransmissionofSoundThroughFiniteMultiple-PanelPartition...... 1
1.1 SimplySupportedFiniteDouble-PanelPartitions..................... 2
1.1.1 Introduction.................................................... 2
1.1.2 VibroacousticTheoreticalModeling ......................... 4
1.1.3 MathematicFormulationandSolution....................... 5
1.1.4 ConvergenceCheckforNumericalResults.................. 10
1.1.5 ModelValidation.............................................. 11
1.1.6 EffectsofAirCavityThickness .............................. 13
1.1.7 EffectsofPanelDimensions.................................. 17
1.1.8 EffectsofIncidentElevationAngleandAzimuthAngle.... 20
1.1.9 Conclusions.................................................... 23
1.2 ClampedFiniteDouble-PanelPartitions............................... 24
1.2.1 Introduction.................................................... 24
1.2.2 ModelingoftheVibroacousticCoupledSystem............. 26
1.2.3 ModelValidation.............................................. 32
1.2.4 FiniteVersusInfiniteDouble-PanelPartition................ 34
1.2.5 EffectsofPanelThicknessonSTL........................... 35
1.2.6 EffectsofAirCavityThicknessonSTL ..................... 37
1.2.7 EffectsofIncidentAnglesonSTL ........................... 37
1.2.8 Conclusions.................................................... 40
1.2.9 SoundTransmissionMeasurements.......................... 41
1.2.10 RelationshipsBetweenClampedandSimply
SupportedBoundaryConditions.............................. 47
1.2.11 Conclusions.................................................... 51
1.3 ClampedFiniteTriple-PanelPartitions ................................ 53
1.3.1 Introduction.................................................... 53
1.3.2 DynamicStructuralAcousticFormulation................... 56
1.3.3 ThePrincipleofVirtualWork ................................ 60
1.3.4 DeterminationofModalCoefficients ........................ 60
1.3.5 SoundTransmissionLoss..................................... 63
1.3.6 ModelValidation.............................................. 63
ix