Magnetic bearingsa new world opens for design engineers.docx

Magnetic bearingsa new world opens for design engineers.docx

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Magneticbearingsanewworldopensfordesignengineers

ComputerPhysicsCommunications,Volume181,Issue6,June2010,Pages1150-1160

BenzhuoLu,XiaolinCheng,JingfangHuang,J.AndrewMcCammon

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489

Servicecategory-to-wavelengthselectiontechniqueforQoSsupportinconnection-orientedopticalpacketswitching  OriginalResearchArticle

ComputerNetworks,Volume51,Issue1,17January2007,Pages14-30

D.Careglio,J.SoléPareta,S.Spadaro

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AbstractAbstract|Figures/TablesFigures/Tables|ReferencesReferences

Abstract

Thispaperconsidersanopticalpacket-switchednodesubjecttoasynchronous,variable-lengthpacketsandconnection-orientedoperation.Wefirstlyaddresstheproblemofsettinguptheopticalvirtualconnectionsandproperlyconfiguringtheforwardingtableatthenode.Wedonotdealwithroutingaspects,butwiththeefficientmappingofthevirtualconnectionstothewavelengthsoftheoutputports.Inthiscontext,wesuggestawavelengthassignmentprocedurethatimprovesthenodeperformanceincomparisonwithsimplerandomorbalancedschemes.WethenaddresstheQoSprovisioningproblem.Whileexistingsolutionsfocusonapplyingsomeformsofresourcereservationontopofthecontentionresolutionalgorithm,hereweproposeamethodbasedonthewell-knownATMschemeofdefiningdifferentservicecategories.Inparticular,wedefineacasestudywiththreeOPSservicecategories,andforeachcategoryaspecificcontentionresolutionalgorithmisapplied.Withsuchastrategythealgorithmspresenttheproblemofadifferentperformancealignment;wesolveitbydesigninganadhocopticalbufferarchitecturebasedonnon-degeneratedelays.Theperformanceofthefinalnodearchitectureisevaluatedbysimulation.Theresultsobtainedindicatethemeritsofthismethod,whichopensupinterestingfuturedevelopmentsforawholeopticalnetworkscenario.

ArticleOutline

1.Introduction

2.TheWAprobleminconnection-orientedOPS

2.1.Problemdescription

2.2.Thegroupingwavelengthassignment（GRP-WA）algorithm

2.3.Performanceevaluation

3.QoSprovisioning

3.1.Servicecategory-to-wavelengthselectiontechnique

3.2.Performanceevaluation

3.3.Adhocopticalbufferarchitecture

4.Summaryandconclusion

Acknowledgements

AppendixA.Simulationenvironment

References

Vitae

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Thedeploymentofartificialreefecosystem:

Modelling,simulationandapplication  OriginalResearchArticle

SimulationModellingPracticeandTheory,Volume14,Issue5,July2006,Pages663-675

Chun-HsiungLan,Che-YuHsui

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Abstract

Artificialreefs（ARs）havebeendemonstratedtobeapotentialtoolfortherestorationofmarinehabitatandtoretardthestressofcoralreefsinrecentdecades.Formostengineers,thedeploymentofanartificialreefecosystem（ARE）isbasedontheirexperience,butwhatistheeffectivedeploymenttoproducethehigherabundanceandtoenrichbiomassunderthefinitebudgetisseldommentioned.Infact,howtodeployartificialreefsintotheselectedsiteandconstructaneffectiveAREisthemostchallengetoecologicalengineers.

Themainobjectiveofthisresearchistoconstructamathematicalmodelcalledthedeploymentofartificialreefcommunities（DARCs）model,andthentoprovideaconcreteapproachfordeployinganAREunderthefinitebudget.TheconstructingspiritofDARCsmodelisbasedontheobservationsofbiologiststhatahighercomplexityofhabitatsystemwillincreasethespeciesdiversityandbiomass.Thefractaldimension（FD）isappliedasanassessingindicatorforthehabitatsystemcomplexityofAREinthisstudy.Inaddition,astep-by-stepalgorithmforachievingthemaximalfractaldimensionofanAREthroughthedeterminationsofthenumberofdeployedartificialreefcommunities（ARCs）,thedistanceofadjacentARCs,andthespatialconfigurationofARCsinanAREispresented.AcomputerizedtoolwrittenbyFortranprogramtoconductthedesignofanAREaswellasperformthesimulatedanalysesiscompletelyproposed,andacasestudyisfollowed.Thesimulation-basedanalysesofchangingbudgetrevealthattheFDofagivenregionwillbeconstrainedregardlessofincreasingbudget.ThisphenomenonshowsthatthemoredeploymentofARCsmayleadtowastecapital.Finally,adecisionsupportsystemcalledDSSforAREisestablishedforthequick-designofanARecosystemundertheconsiderationofconservationpolicy.

ArticleOutline

Nomenclature

1.Introduction

2.Assumptions

3.Modelconstruction

4.Astep-by-stepalgorithm

5.Acasestudy

6.Simulatedanalyses

7.Decisionsupportsystem

8.Conclusion

Acknowledgements

AppendixA.Appendix

References

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Non-linearaeroelasticpredictionforaircraftapplications  ReviewArticle

ProgressinAerospaceSciences,Volume43,Issues4-6,May-August2007,Pages65-137

M.J.deC.Henshaw,K.J.Badcock,G.A.Vio,C.B.Allen,J.Chamberlain,I.Kaynes,G.Dimitriadis,J.E.Cooper,M.A.Woodgate,A.M.Rampurawala,D.Jones,C.Fenwick,A.L.Gaitonde,N.V.Taylor,D.S.Amor,T.A.Eccles,C.J.Denley

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Abstract

Currentindustrialpracticeforthepredictionandanalysisofflutterreliesheavilyonlinearmethodsandthishasledtooverlyconservativedesignandenveloperestrictionsforaircraft.Althoughthemethodshaveservedtheindustrywell,itisclearthatforanumberofreasonstheinclusionofnon-linearityinthemathematicalandcomputationalaeroelasticpredictiontoolsishighlydesirable.Theincreaseinavailableandaffordablecomputationalresources,togetherwithmajoradvancesinalgorithms,meanthatnon-linearaeroelastictoolsarenowviablewithintheaircraftdesignandqualificationenvironment.ThePartnershipforUnsteadyMethodsinAerodynamics（PUMA）DefenceandAerospaceResearchPartnership（DARP）wassponsoredin2002toconductresearchintonon-linearaeroelasticpredictionmethodsandanacademic,industry,andgovernmentconsortiumcollaboratedtoaddressthefollowingobjectives:

（1）Todevelopuseablemethodologiestomodelandpredictnon-linearaeroelasticbehaviourofcompleteaircraft.

（2）Toevaluatethemethodologiesonrealaircraftproblems.

（3）Toinvestigatetheeffectofnon-linearitiesonaeroelasticbehaviourandtodeterminewhichhavethegreatesteffectontheflutterqualificationprocess.Theseaimshavebeenveryeffectivelymetduringthecourseoftheprogrammeandtheresearchoutputsinclude:

（a）Newmethodsavailabletoindustryforuseintheflutterpredictionprocess,togetherwiththeappropriatecoachingofindustryengineers.

（b）Interestingresultsinbothlinearandnon-linearaeroelastics,withcomprehensivecomparisonofmethodsandapproachesforchallengingproblems.

（c）Additionalembryonictechniquesthat,withfurtherresearch,willfurtherimproveaeroelasticscapability.Thispaperdescribesthemethodsthathavebeendevelopedandhowtheyaredeployablewithintheindustrialenvironment.WepresentathoroughreviewofthePUMAaeroelasticsprogrammetogetherwithacomprehensivereviewoftherelevantresearchinthisdomain.ThisissetwithinthecontextofagenericindustrialprocessandtherequirementsofUKandUSaeroelasticqualification.Arangeoftestcases,fromsimplesmallDOFcasestofullaircraft,havebeenusedtoevaluateandvalidatethenon-linearmethodsdevelopedandtomakecomparisonwiththelinearmethodsineverydayuse.Thesehavefocusedmainlyonaerodynamicnon-linearity,althoughsomeresultsforstructuralnon-linearityarealsopresented.Thechallengesassociatedwithtimedomain（coupledcomputationalfluiddynamics–computationalstructuralmodel（CFD–CSM））methodshavebeenaddressedthroughthedevelopmentofgridmovement,fluid–structurecoupling,andcontrolsurfacemovementtechnologies.Conclusionsregardingtheaccuracyandcomputationalcostofthesearepresented.Thecomputationalcostoftime-domainmethods,despitesubstantialimprovementsinefficiency,remainshigh.However,significantadvanceshavebeenmadeinreducedordermethods,thatallownon-linearbehaviourtobemodelled,butatacostcomparablewiththatoftheregularlinearmethods.OfparticularnoteisamethodbasedonHopfbifurcationthathasreachedanappropriatematurityfordeploymentonrealaircraftconfigurations,thoughonlylimitedresultsarepresentedherein.ResultsarealsopresentedfordynamicallylinearisedCFDapproachesthatholdoutthepossibilityofnon-linearresultsatafractionofthecostoftimecoupledCFD–CSMmethods.Locallinearisationapproaches（higherorderharmonicbalanceandcontinuationmethod）arealsopresented;thesehavetheadvantagethatnopriorassumptionofthenatureoftheaeroelasticinstabilityisrequired,butcurrentlythesemethodsarelimitedtolowDOFproblemsanditisthoughtthatthesewillnotreachalevelofmaturityappropriatetorealaircraftproblemsforsomeyearstocome.Nevertheless,guidanceonthemostlikelyapproacheshasbeenderivedandthisformsthebasisforongoingresearch.Itisimportanttorecognisethattheaeroelasticdesignandqualificationrequiresavarietyofmethodsapplicableatdifferentstagesoftheprocess.Themethodsreportedhereinarema