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29
2023.06
Interaction between diffusion and stress
Understanding structural durability and safety of metal-ion batteries,such as lithium-ion battery and sodium-ion battery,is of practical importance for applications in electric vehicles and hybrid electric vehicles.
29
2023.06
Multiscale Modelling of Non-equilibrium Gas Transport
By simultaneously considering models at different scales,multiscale modelling offers an approach to accurately and efficiently describe problems for which the multiscale charac- ter is the dominating issue.In this talk,I will introduce my works on the multiscale modelling of non-equilibrium gas transport,which are based on a hybrid of macroscopic equations resolving flows in terms of macroscopic quantities and gas kinetic equations describing the variation of the molecular velocity distribution function,or quantum mechanical calculations from first principles. Following different coupling strategies,different methods have been developed,which are utilised to find the solutions to several multiscale problems.
27
2023.06
From the Fundamentals of Droplet Evaporation to Leidenfrost Engine
In this talk I will introduce some aspects related to droplet evaporation such as droplets evaporating on flexible substrates,complex fluids and biodroplets.The talk will also present some results on controlling droplets motion using surface roughness.Finally,the concept of a Leidenfrost engine will be presented as it stemmed from this fundamental research.
11
2022.07
Modelling fluid /body interactions
The interest here is in free motion of a body (particle) within fluid flow concerned with impacts and ice formation. Many interactions are involved. This mathematical-modelling research, motivated by observed icing of vehicles and by environmental and biomedical applications, aims to address several related problem areas. One area is the two-way fluid /body interaction occurring when a body is lifted off the ground by an oncoming fluid flow, with account taken of the small density and viscosity ratios present. Another area is on the impact of a body, passing through air, onto a solid surface. The effect of a water layer here is also of relevance.
17
2022.05
The International Conference on Spectroscopic Ellipsometry (ICSE)
TheInternationalConferenceonSpectroscopicEllipsometry(ICSE)isthelargestandbest-knowninternationalconferenceonspectroscopicellipsometryandrelatedtechniques.SincethefirstICSEheldin1993,theconferencehasbeentheplacewherenewadvancesanddevelopmentsinellipsometryarediscussedwithavarietyofinternationalparticipantsfrommanydifferentcountries. The9thInternationalConferenceonSpectroscopicEllipsometrywillbeheldinBeijing,ChinafromMay22ndto28th,2022.The9thInternationalConferenceonSpectroscopicEllipsometrycontinuesthewell-establishedICSEseriestoprovideanexcellentforumforscientistsandengineersworkingininstrumentation,scienceandapplicationsofspectroscopicellipsometryandrelatedtechniques. ICSE-9willbringtogetherinternationalparticipantsfrommanycountriesandofferthemtheopportunitytopresenttheirlatestresults.Bothyoungandexperiencedresearchersarekindlyinvitedtoparticipateandinteractfordissemination,discussion,andadvancementofscienceandtechnologytopicsrepresentedinICSE-9. Lastyear,weannouncedourplanstocreateahybridconference,andwewereverymuchlookingforwardtohavinganonsitemeetinginBeijinginadditiontoanonlinecomponent.DuetothecontinuingimpactoftheCOVID-19pandemiconpeoplethroughouttheworld,wehavedecidedtoswitchthecongresstoafullyonlinemeeting.
15
2020.12
LHD Annual Conference 2020
Venue：AuditoriumofBuildingNo.1,InstituteofMechanicsTime:9:00am,December18,2020
27
2020.10
The 2nd Conference in Intelligent Simulation and Control of Complex System Mechanics
08
2020.04
Recent Advances on the Mechanics of Soft Materials（8:30AM April 9,2020; Auditorium of Building No.1）
07
2018.06
Hsue-Shen Tsien Lecture of Engineering Sciences(9:00 AM June 7,2018; Auditorium of Building No.1)
Title:RecentAdvancesinDynamicSystemResearchReporter:ProfessorWeidongZhuDepartmentofMechanicalEngineeringUniversityofMaryland,BaltimoreCountyAbstract:Someinterestingresultsonvibrationandstabilityofdistributedstructuralsystems,vibration-baseddamagedetection,andinfinitelyvariabletransmissionarereviewed.Vibrationandstabilityoftranslatingmediawithtime-varyinglengthsand/orvelocitiesareaddressed.Twotypesofdynamicstabilityproblemsareconsidered:dynamicstabilityoftranslatingmediaduringextensionandretraction,andparametricinstabilitiesindistributedstructuralsystemswithperiodicallyvaryinglengthsand/orvelocities.Theincrementalharmonicbalancemethodisusedandmodifiedtohandleperiodicresponsesofhigh-dimensionalnonlinearmodelsandtheirstabilityandbifurcations,aswellasquasi-periodicresponses.Anewspatialdiscretizationandsubstructuremethod,whichensuresthatallmatchingconditionsofdistributedcomponentsaresatisfied,andhenceuniformconvergenceofsolutions,arediscussed.Newformulationsofflexiblemultibodydynamicsaredevelopedwithapplicationtoelevatortravelingcables.Nonlinearwavepropagationinphononicstructuresandelasticwavecloakingarediscussed.Twomajorchallengesinmodel-baseddamagedetectionareaddressed:accuratemodelingofstructuresanddevelopmentofarobustnessalgorithmforidentifyinglocationsandextentofdamage.Non-model-baseddamagedetectionmethodsusingscanninglaservibrometryarealsopresented. BriefBiographyWeidongZhuisaProfessorintheDepartmentofMechanicalEngineeringattheUniversityofMaryland,BaltimoreCounty,andthefounderanddirectorofitsDynamicSystemsandVibrationsLaboratoryandLaserVibrometryLaboratory.HereceivedhisPhDdegreeinMechanicalEngineeringfromtheUniversityofCaliforniaatBerkeleyin1994.Heisarecipientofthe2004NationalScienceFoundationCAREERAward,the2007AmericanSocietyforNondestructiveTestingFellowshipAward,the2008ChangJiangScholarChairProfessorshipinGeneralMechanicsfromtheMinistryofEducationofChina,the2009DailyRecord'sMarylandInnovatoroftheYearAward.HehasbeenanASMEFellowsince2010,wasanAssociateEditoroftheASMEJournalofVibrationandAcousticsfrom2007-2014,andisaSubjectEditoroftheJournalofSoundandVibration.Hisresearchspansthefieldsofdynamics,vibration,control,appliedmechanics,structuralhealthmonitoring,windenergy,andmetamaterials,andinvolvesanalyticaldevelopment,numericalsimulation,experimentalvalidation,andindustrialapplication.Hehaspublishedover120SCI-indexedjournalpapersinthesefields.
28
2018.05
LNM Academic Report
Title：：UnderstandingWaterIce:TenWeirdFactsReporter：Prof.ChangQSunTime：15:00pm,May28,2018Venue：Room204BuildingNo.5,InstituteofMechanicsAbstract：Asthesourceandcentralpartofalllife,thesimplesubstance,waterice(H2O),bendstherules-itistoostrange,tooanomalous,andtoochallenging.Ideasintermsofcontinuumthermodynamics,moleculardynamics,orstructuralorderconfigurationcouldhardlyexplaincompletelytheweirdfactsthatonecanobserve.Fromtheperspectiveofhydrogenbond(O:H—O)cooperativityandpolarizability,wehavereconciledthemysteriesofwatericesubjectingtomechanicalcompression,thermalstimulation,molecularundercoordination,andelectromagneticexcitation.Hereweshareunderstandingoftentypicalfacts:icefloating,iceregelation,icefriction,“instant”icing,nanobubblestability,water'stoughskin,salticemelting,floatingwaterbridge,frogmaglev,andtheMpembaparadox-warmerwatercoolsfaster.Asthebasicstructuralandenergy-exchangeunit,theO:H—Obondcooperativerelaxationinlengthandenergyrulestheweirdnessofwaterice.
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