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1.
变速运动颗粒所受非恒定作用力分析   总被引:5,自引:0,他引:5  
本文利用典型函数试验法对变速运动颗粒所受非恒定作用力(Basset力和附加质量力)进行了深入分析和比较,结果表明:Basset力对重质颗粒运动的影响很大,不能忽略;对于轻质颗粒,则以附加质量力的作用为主,Basset力可忽略不计.  相似文献   

2.
IntroductionGasatomizationisaprocessinwhichthehigh_velocitygasstreamimpingesonthemoltenmetaljetandbreaksitupintodroplets.Beingabasicprocess,gasatomizationiswidelyused,includingpowdermetallurgy,sprayforming,etc..Castleman[1]postulatedthatatomizationis…  相似文献   

3.
1 BasicDefinitionsandNotationsWeonlydealwithfiniteundirectedsimplegraphs.LetGbeagraphwithvertexsetV(G)andedgesetE(G) .Foreachx∈V(G) ,wedenotethedegreeofxinGbydG(x) .Letg ,fbetwointeger_valuedfunctionsdefinedonV(G)suchthatg(x)≤f(x)forallx∈V(G) .A (g ,f)_factorofGisas…  相似文献   

4.
Coexisting periodic orbits in vibro-impacting dynamical systems   总被引:1,自引:0,他引:1  
IntroductionItisacommonphenomenonthatavarietyofattractivesetscoexistinsmoothnonlineardynamicalsystems.Insomefamousmodels,forexample ,inDuffing’sequationandVanderPol’sequation ,ithasbeenfoundthat,etc.therecoexistseveralattractivesetsbymeansofanalyticmetho…  相似文献   

5.
Unified Way for Dealing with Three-Dimensional Problems of Solid Elasticity   总被引:3,自引:0,他引:3  
IntroductionComputinganalysisfortheproblemsofthethree_dimensionalsolid ,eachtypeofplatesandshellsetc .,numericalalgorithmincommonusehasfinitedifferencemethod ,finiteelementmethod ,weightedresidualsmethodandBEMetc.Owingtocomplexityofthethree_dimensionalpro…  相似文献   

6.
IntroductionGasatomizationisaprocesthatthehigh_velocitygasimpingesonthemoltenmetalstreamandbreaksitupintodroplets.Beingabasic...  相似文献   

7.
Bifurcation analysis of a double pendulum with internal resonance   总被引:1,自引:1,他引:0  
IntroductionAnonlineardynamicalsystemmayexhibitcomplexdynamicbehaviorinthevicinityofacompoundcriticalpoint[1].AccordingtothestructureoftheJacobianevaluatedatthecriticalpoint,thesystemsmaybeclassified,ingeneral,asco_dimensionone,co_dimensiontwo,etc.[2].Wheno…  相似文献   

8.
IntroductionLetΓ0 beasmoothconnectedhypersurfaceanditistheboundaryofaboundedopensetU Rn.Supposethatt0 isatime ,M =M(x) ∈C3withM( 0 ) =0 ,M′(x) >0 ,andl1,l2 ,… ,lnarepositiverealnumbers.{Γt} 0 ≤t≤t0 isaclassicalsmoothsurface,anditistheboundaryofaboundedopensetUt,whichisdiff…  相似文献   

9.
从分析气体分子的悬浮和静水中Brown微粒的悬浮之机理出发,论述了重力场中粒子(分子、微粒等)的悬浮不一定需要其它外力,粒子本身的任何形式的无规则运动,达到一定强度后都能使粒子弥散悬浮.河流中的泥沙颗粒和气(水)力输送管道中的颗粒的悬浮也主要靠颗粒物的无规则运动.作用于颗粒的升力和其它力可改变颗粒悬浮沿高度的分布,但仅用这些力(若无任何无规则运动)无法解释颗粒的弥散悬浮状态.讨论了颗粒对流动阻力的双重作用:支持颗粒悬浮的湍流脉动因引入颗粒而削弱,这是颗粒的减阻作用;颗粒增阻的一个主要机制是,流体给予颗粒的水平动量在颗粒一壁面碰撞中不断地损失.用悬浮动概念解释颗粒引起的增阻是不正确的.  相似文献   

10.
SOME PROBLEMS IN THE Z-C-X SPACE   总被引:2,自引:0,他引:2  
IntroductionThispaperisacontinuationofRef.[1 ]bytheauthor,itisoneofthemaincontentsaboutinvestigatingrandomsolutionsofrandomoperatorequations.Throughoutthispaperlet(E ,B)beameasurablespace ,whereEisaseparablerealBanachspace ,Bdenotestheσ_algebraofgeneratingb…  相似文献   

11.
IntroductionDuringthecourseofstudyingthewaterwave,manycompletelyintegrablemodelswereobtained ,suchasKdVequation ,mKdVequation ,(2 1 )_dimensionalKPequation ,coupledKdVequations,variantBoussinesqequations ,WKBequationsetc .[1- 13 ].Inordertofindexpliticexactsolutio…  相似文献   

12.
ATHREE-FLUIDMODELOFTHESAND-DRIVENFLOW¥(刘大有,董飞)LiuDayou;DongFei(InstituteofMechanics,AcademiaSinica,Beijing100080,P.R.China)Abs...  相似文献   

13.
IntroductionDuringthemid_1 980’s,atomographicimagingtechniquesuitedtoindustrialprocessdetection ,ProcessTomography[1],wasrapidlydevelopedintheUK ,USA ,etc .withsuccessfulapplicationsofCTtechniquetomedicaldiagnosis .Inparticular,asanewmemberwithinthefamilyofthe…  相似文献   

14.
IntroductionUptonow,therehavebenmanyresearchesontheplaneweldingproblemofisotropicmaterials.e.g.[1]and[2]etc.However,forthepla...  相似文献   

15.
1IntroductionandPreliminariesIn1968,Browder[1]provedthefollowingtheorem.Theorem11(Browder[1]) LetEbeaHausdorfftopologicallinearspace,XacompactconvexsubsetofEandF:X→2Xamappingsatisfyingthefollowingconditions:ⅰ)Foranyx∈X,F(x)isnonemptyandconvex;ⅱ)Fora…  相似文献   

16.
1 MeaningandMethodsofStudyingofFinancialDerivativesFinancialderivativesarethosefinancialproductswhicharederivedfrombasicasserts (orunderlyinginstrucments) (e .g .stock ,bond ,currency ,interestrate,etc.)oftraditionalmarkets(e.g .stockmarket,bond’smarket,currency…  相似文献   

17.
本文简单介绍了泥石流及其防治和研究简况.对于泥石流运动方程,介绍了Bingham模型、日本高桥保的颗粒流膨胀体模型、美国Chen的塑性颗粒流膨胀体模型以及作者的非牛顿塑性膨胀体模型,并介绍了美国MacArthur和Hamilton对泥石流运动的数值模拟.最后,对泥石流运动研究进行了展望  相似文献   

18.
IntroductionLetΩbeanopenboundeddomainofRN,Q=Ω× (0 ,T) ,0 <T<∞ ,2 ≤p<∞ ,(1 /p) (1 /p′) =1 .Forconvenience ,wesetV =W1,p0 (Ω) ,V′=W- 1,p′(Ω)inthesequel.ThenVisarealreflexiveBanachspacedenselyandcompactlyimbeddedintoLp(Ω) .ThenormofanyBanachspaceBisdenotedby‖·‖B.ThepairingbetweenBan…  相似文献   

19.
IntroductionLet(E,|·|)bearealBanachspacewithapartialorderintroducedbyaregularconeKofE.Inthispaper,theexistenceofsolutionsofthefollowingperiodicboundaryvalueproblems(PBVP)willbeinvestigated:  (Ⅰ)u″=f(t,u,Tu) a.e.t∈J,u(0)=u(a),u′(0)=u′(a),wheref∈C(J×E×E,E),J=[0,a](a>0),and(T…  相似文献   

20.
BBAIZhan_bing (白占兵 )ExistenceandMultiplicityofPositiveSolutionsforaFourth_Orderp_LaplaceEquations 1 2 ( 1 476)………………………………………………………………………BAOWen_bo (鲍文博 )SeeXUYu_xiu (徐玉秀 ) 5( 586)…………………………………AmitabhBanerjeeandThakurBalwantSinghAFixedPointTheoremforSet_ValuedMapping…  相似文献   

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