最新刊期
      卷 47 ， 期 4 ， 2015
      • Vol. 47, Issue 4, Pages: 1-5(2015) DOI: 10.15961/j.jsuese.2015.04.001
        摘要：Abstract:For an aerator with sudden lateral enlargement and vertical drop in free flow chute,the bottom cavity length is governed not only by hydraulic parameters,but also by structural parameters of the bottom aerator and lateral aerator.The previous calculation method for the bottom cavity length failed to consider the effect of lateral aerator’s structural parameters.Based on the hydrodynamic analysis of micro water unit of jet flow from aerator,a new calculation method for the bottom cavity length of jet flow from chute aerators with sudden lateral enlargement and vertical drop was obtained,which considers overall effects of the above mentioned parameters.The comparison with 30 groups of experimental data and existing research results showed that the calculating method proposed in this paper has higher accuracy.  
        关键词：cavitationsalleviationbyaeration;aerator;cavitylength;suddenlateralenlargementandverticaldrop;lateralaerator   
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      • Vol. 47, Issue 4, Pages: 6-13(2015) DOI: 10.15961/j.jsuese.2015.04.002
        摘要：Abstract:To study the backwater extent law of close mulit-parallel bridges,the backwater extent rule of a single bridge was analyzed and applied to the research of two parallel bridges analogously,getting the corresponding laws.The results showed that if the passive influenced bridges are all at the downstream of the active influenced bridges,the backwater of the active influenced bridges will be influenced by both its own water resistance and the positive effects of the passive influenced bridges.On the contrary,it will be influenced by the negative effects of the passive influenced bridges,and the influence coefficient decreases with the growth of the spacing between each bridge.It can be assumed that there will be a calculative backwater when the backwater of parallel bridges are influenced by each other,this backwater has a secondary influence on other bridges and then infinitely approach the real backwater.Based on this assumption,the empirical formula of each bridge backwater can be summarized when the multi-bridges are parallel.  
        关键词：parallelbridge;backwater;backwater of bridge piers;calculative backwater;spacingbetweenbridges   
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      • Vol. 47, Issue 4, Pages: 14-37(2015) DOI: 10.15961/j.jsuese.2015.04.003
        摘要：Abstract:A complete set of stability evaluation system for the comprehensive test method of geo-mechanical model has not been formed.Concerning this issue,firstly,according to the basic principle of the three geo-mechanical model methods of failure tests and the basic formula of point safety factor,a relationship on assessing the stability of dams was established based on the comprehensive test method of geo-mechanical models.Secondly,the stability evaluation system was presented based on the deformation monitoring data and the relation curves between the deformation and the overloading coefficient by using the deformation catastrophe theory.The inflection point 1 of the deformation curve was taken as the initial crack feature point,the inflection point 2 as the large deformation feature point.And the overloading coefficients corresponding to the feature points were as the basis of stability evaluation of high arch dam.Finally,the comprehensive test method of geo-mechanical model was applied to study the overall stability of Jinping Ⅰ high arch dam.A 3D geo-mechanical model failure test was carried out under the condition of reinforcement foundation.The deformation characteristics,failure patterns and mechanisms of the dam abutment and foundation were investigated in the test study.The safety evaluation based on the experimental model indicated that the overall stability safety factor of the dam abutment and foundation ranges from 5.2 to 6.0.The research results provide an important scientific basis for the design,construction and safe operation of the project.  
        关键词：model test;deformation monitoring;evaluation system;JinpingⅠhigh arch dam;stability analysis   
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      • Vol. 47, Issue 4, Pages: 22-30(2015) DOI: 10.15961/j.jsuese.2015.04.004
        摘要：Abstract:A new method for the definition and measurement of roughness of soil-structure interface was proposed based on reversing the roughness measured by sand filling method.The new method, sand filling method and the method for the measurement of peak-valley distance were used to measure the roughness of the surfaces with semi-circle grooves made by the test and the surface with tooth grooves made by the other research scholars.The comparisons were made according to the results of measurement.The direct shear tests on the interface of red clay-concrete block were carried out using the large-scale direct apparatus.The effects of roughness on the interface characteristics of shear failure and deformation were studied by quantitative analysis and the effect mechanism of roughness were discussed.The results indicated that, for the measurement of roughness of interface,the new method suggested by this paper is more effective than both sand filling method and the method for the measurement of peak-valley distance.The shear failure of interface agrees well with the Mohr-Coulomb strength failure criterion.The roughness has little effects on the internal friction angle.The growth rates of the shear strength and the cohesion reduce with the increment of roughness of interface.With the increment of roughness of interface, the cohesion of interface increases until it approaches to the cohesion of red clay.If the cohesion of interface approaches to that of red clay,the shear failure may occur on the interface or in the soil near the interface.With the increment of the normal stress,the critical roughness decreases,meanwhile,the effects of roughness on shear strength of interface reduce.When the roughness of interface is low, the stress-dropping phenomenon is shown after the shear failure occurs.  
        关键词：cohesive soil;interface roughness;large-scale direct shear test;effective volume of sand filling;critical roughness;compatibility of deformation   
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      • Vol. 47, Issue 4, Pages: 31-37(2015) DOI: 10.15961/j.jsuese.2015.04.005
        摘要：Abstract:Assuming the variation of the seismic coefficient with height and by using the pseudo-dynamic method, the thin-layer micro-element method and limit equilibrium principles,a new formulation was proposed to calculate the active seismic pressure on retaining wall.The angle of critical failure wedge,the active earth pressure coefficient and the resultant force point can be calculated using the developed formulation.The relationship between the seismic coefficient and the earth pressure distribution on retaining wall were studied.The results showed that the earth pressure coefficient is between the Coulomb’s earth pressure coefficient and the Rankine’s earth pressure coefficient.The resultant force point is change with the time,and is much higher than that of the traditional method about H/3.The distribution of earth pressure on retaining wall follows a non-linear pattern at each moment.The seismic coefficient and the internal friction angle have great influence on the earth pressure distribution.  
        关键词：seismicload;retainingwall;pseudo-dynamicmethod;earthpressuredistribution;resultantforcepoint   
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      • Vol. 47, Issue 4, Pages: 38-44(2015) DOI: 10.15961/j.jsuese.2015.04.006
        摘要：Abstract:In cold regions of west China,freeze-thaw environment is one of the main factors for leading to the damage of concrete.The freeze-thaw cycling experiment was conducted on concrete under water-saturated conditions,the uniaxial compression experiments were carried out on different freeze-thaw cycles,and the mechanical properties of concrete specimen was systematically analyzed from the perspective of damage and energy dissipation.After freeze-thaw test,the meso-structures of the concrete specimens were preliminary researched by CT meso-test method. Then the failure forms of the specimens under water-saturated and the changes of the mass, the complete stress-strain curves,uniaxial compressive strengths,energy dissipation and the variation characteristics of meso-structures of the concrete specimens after different freeze-thaw cycles were obtained.The main physic-mechanical properties and fracture law of concrete weres explained under freeze-thaw environment. The results can provide the theory basis for major engineering freeze-thaw catastrophe prediction and prevention research in the cold region.  
        关键词：concrete;freeze-thaw (F-T) cycles;mechanical damage degradation;energy dissipation   
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      • Vol. 47, Issue 4, Pages: 45-51(2015) DOI: 10.15961/j.jsuese.2015.04.007
        摘要：Abstract:Based on quasi-static tests of 3 reactive powder concrete shear walls,the failure mode,bearing capacity,hysteretic loops,and characteristic of energy dissipation of RPC shear wall were investigated.Using the finite element software OpenSees and multi-layer shell element,the nonlinear analysis was performed to simulate the complete loading and mechanical behavior.Experimental results were simulated.By combining the experimental research and the numerical simulation,the influence of axial load ratio on the ductility was studied,and the allowable axial load ratio of RPC shear wall was investigated aiming at the ductility factor not less than 3.  
        关键词：reactive powder concrete;RPC shear wall;quasi-static test;OpenSEES;axial load ratio   
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      • Vol. 47, Issue 4, Pages: 52-60(2015) DOI: 10.15961/j.jsuese.2015.04.008
        摘要：Abstract:Based on laboratory physical model and field experiments which consisted of pullout tests and strain monitoring on bolt-grout interface,wood bolts fully grouted by potassium silicate solution-(fly ash + silt) (PS-(F+C)) slurry in rammed earth were researched on its anchor capacity,failure mode,shear stress distribution and transfer along the bolt-grout interface.Experimental results showed that ultimate pullout force in laboratory (24~38 kN) is far larger than that in field (2.5~8 kN). Low elastic deformation and high plastic deformation of anchor system result in strong ductility.In the process of loading,multi-peak stress distributes along bolt-grout interface and higher stress value usually appears near anchor end,meanwhile,compressive stress occasionally emerges in monitoring interface.Results proved that such anchor system benefits from advantages of both the tensile anchor and compressive anchor.In conclusion,with considerably physical and mechanical compatibility to rammed earth,the anchor system is fairly suitable to conservation of rammed earth sites.  
        关键词：rammed earth sites;wood bolt;potassium silicate solution-(fly ash + silt) (PS-(F+C)) slurry;ultimate pullout force;interface shear stress transfer   
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      • Vol. 47, Issue 4, Pages: 61-68(2015) DOI: 10.15961/j.jsuese.2015.04.009
        摘要：Abstract:Buckling-restrained brace frame structure with a rational damage order and failure mechanism under the action of earthquake,could be regarded as the ideal structural system with multichannel seismic line.To research the damage of buckling-restrained brace frame under earthquake,floor damage model based on damage models of frame column,frame beam and buckling-restrained brace members using the weighted partial coefficient method was used to build the global damage model and the damage states and corresponding damage index range of buckling-restrained brace frame were defined by combining the damage indexes.Buckling-restrained brace frame structure vulnerability curves considering the ground motion uncertainty and uncertainty of the structure were compared by IDA analysis.The results showed that,in the collapsed state,the difference is not obvious,and under the collapsed state,logarithmic standard deviation increased when considering structure uncertainty.The fragility curves were compared by using the maximum inter storey displacement angle and the damage index structure of the structure.  
        关键词：buckling-restrainedbraceframe;componentdamagemodel;globaldamagemodel;vulnerabilityanalysis;structureuncertainty   
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      • Vol. 47, Issue 4, Pages: 69-75(2015) DOI: 10.15961/j.jsuese.2015.04.010
        摘要：Abstract:Throughtherelativepermeabilitytestonthetruncatedconespecimensofyellowriversuperfinesandplasticconcrete(YRSSPC),effectsofinfluencingfactorsincludingthereplacementratesuperfinesand(R),water cementratio(W/C),thepercentageofclayinthecementitiousmaterial(c1)andthepercentageofcementinthecementitiousmaterial(c2)upontherelativepermeabilitycoefficientofYRSSPC(Kr)werestudied.Basedontheexperimentalresults,acomputationalmodelwasproposedtocalculateKrofYRSSPC.TheresultsshowedthatRhassignificanteffectonthegraincompositionoffineaggregate,andthenithaseffectonKr.Krtendstodecreaseas Rincreases.WhenRisover25%,thepermeabilityofYRSSPCischangedsignificantly,so25%isthecriticalpoint.ThebestRis50%.W/ChassignificanteffectonKr.Krincreaseswith the increase ofW/C.TheclaycontentandthecementcontenthaveeffectsonKr.Kr decreasesfirst,andthenincreaseswith the decrease of c1.Krdecreaseswith the increase of c2.  
        关键词：replacementratesuperfinesand;water-cementratio;claycontent;cementcontent;relativepermeabilitycoefficient;plasticconcrete   
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      • Vol. 47, Issue 4, Pages: 76-82(2015) DOI: 10.15961/j.jsuese.2015.04.011
        摘要：Abstract:The whole loading process of two-way self supporting composite plate with a kind of simple piece was studied,meanwhile the composite plate was experimentally studied and compared with the experiment of the same size casting plate.Results indicated that the failure form of the composite plate is similar to the casting plate.Based on these researches and combined with the numerical simulation technology,two-way stress mechanism,crack developing and distribution,bond and slip and stress-transfer mechanism of the rebar in the piece were studied carefully for the type of composite plate.Failure mechanisms of the composite plate in many cases were systematically analyzed and many useful references were provided for this composite plate.  
        关键词：two-wayselfsupporting;compositeplate;stressmechanism   
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      • Vol. 47, Issue 4, Pages: 83-90(2015) DOI: 10.15961/j.jsuese.2015.04.012
        摘要：Abstract:Anadvancedpersistentthreat(APT)isanetworkattackduringwhichanunauthorizedpersonobtainsaccesstoanetworkandstaysthereundetectedforalongperiodoftime.APTattacksaredifficulttoidentifybecauseoftheircompletelyinvisibility.Inspiredbythedangertheoryinthebiologyimmunesystem,adangertheory basedreal-timeresponsemodelforAPTattacks waspresented.Someimportantdefinitionssuchasself,nonself,dangersignal,dangerantigen,antigenpresentingcellandimmunecellinthenetworkactivitiesweredefined.Thedynamicevolutionequationsofantigenpresentingcells,immunecells,andantigengenelibrarywereestablished.Thedangersignalconcentrationwasalsoused tocalculatetheantigendanger.Thetheoreticalanalysisandexperimentalresultsshowedthatthepresentedmodeleffectivelyovercomesthequantitativereal-timecalculationproblemofantigendanger,andhasmuchmoreadaptabilitythantraditionalmethodsforAPTattacksdetection.  
        关键词：dangertheory;APTattacks;artificialimmunesystem;dangersignals   
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      • Vol. 47, Issue 4, Pages: 91-97(2015) DOI: 10.15961/j.jsuese.2015.04.013
        摘要：Abstract:In order to improve the performance of support vector regression machine,a novel algorithm was proposed to solve the support vector regression problem with multiple kernel leaning method (NS-MKR).Lp-norm constraints were imposed on kernel weights with p>1to obtain the non-sparse solution.Two-step optimization method was used to solve the modal.Firstly,standard support vector regression based on a weighted mixture kernel was optimized to obtain Lagrange multipliers.Secondly,kernel weights were solved only with some simple calculation.These two steps were executed alternately until some predefined criterions were satisfied.Experiments on artificial datasets and real datasets showed that the proposed algorithm has better performance than the existing ones which based on single kernel or sparse multiple kernel leaning method.  
        关键词：multiplekernellearning;supportvectorregression;non-sparsekernelscombination;two-stepoptimization   
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      • Vol. 47, Issue 4, Pages: 98-103(2015) DOI: 10.15961/j.jsuese.2015.04.014
        摘要：Abstract:Inordertosolvetheproblemsofthepoornoiseimmunityandlowrobustnessinthevideolanedetection,afastlanedetectionmethodbasedonnewfeatureextractionandclassificationwasproposed.Thesetofmidpointsofoptimalbeamletswasextractedafterusingthebeamlettransformationinthepreprocessedgrayscaleimage,whichwasappliedtotheanalysisofimprovedK-meansclustering.ThepointsineveryclasswasfittedastraightlineorcurvebyusingtheRANSACalgorithmbasedonthreeordersbezierspline.Thesimplifiedbeamletdictionaryandextractingbeamletbaserapidlygreatlyspeedupthebeamlettransform.ThesearchforthebestprojectionlinesandthemultipleiterationsofclusteringcenterwereusedtoimprovetheK-meansclustering,whichsolvestheclusteringproblemofcurvelaneandthenumberoflane.Theresultshowedthatthealgorithmhasgreatreliability,real-timeandrobustnessinthestructuredorunstructuredlaneenvironment.  
        关键词：intelligenttransportationsystem;lanedetection;BeamletTransformation;K;-meansclustering;RANSACfitting   
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      • Vol. 47, Issue 4, Pages: 104-110(2015) DOI: 10.15961/j.jsuese.2015.04.015
        摘要：Abstract:Concerningtheprominentproblemsofrunwayincursionsandaircrafttaxiconflicts,thedesignworkofconflictdetectionandalarmingsystemforairportsurfacewasanalyzedbasedonthefiveprospects of taxiwayconflictalarming,runwayincursiondetectionalarming,restrictedareaintrudingdetectionalarming,passingpathabilitydetectionanddeviationplanningalarming.Basedontheanalysisoftheoperationrulesofaircraftonthegroundandexclusiveprincipleofaccessingtocriticalresources,thresholdtraitsmodelforconflictdetectionalarmwasestablished.Definedrulesaboutfourkindsofairportcomponentsweregiven.Andwiththedefinitionofprofessionaldatastructureandtype,planconflictdetectionwasimplemented.Topreventfalsealarmandmissingalarm,threeconflictalertregionsweredesignatedforeachaircraft.Theconflictintheshorttermwaspredictedbasedonpolygonoverlapdetection.Simulationresultsshowedthatplanroutinginformationcanmatchwithroadnetworkmodelquickly.Throughtraversingcomponents,thetype,timeandlocationoftheconflictcanbetested,andalarmcanbedisplayedinthecorrespondingwindow.Thesimulationresultscoincidedwithconclusionsoftheoreticalanalysis.  
        关键词：conflictdetectionandalert;surfacemovementconflict;criticaltraitmodel;collisionwarningarea   
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      • Vol. 47, Issue 4, Pages: 111-117(2015) DOI: 10.15961/j.jsuese.2015.04.016
        摘要：Abstract:Traditionalactivecontoursegmentationalgorithmexistedover-segmentationandunder-segmentationfortexture-richimages.Inordertosuppressthetextureontheinfluenceoftheimagesegmentation,thediffusemechanismofisotropicandanisotropic wasanalyzed,theedgepreservingandtextureblurringfunction wasdesigned,andthetotalvariationtextureblurringmodelwas established byusingtheimagegradientasvariable.Accordingtotherelationshipbetweenobjectcontourandedge,thecartooncomponentwasextractedbyfixedpointiterationalgorithm,componentsegmentationusingthelevelsetalgorithm.Experimentalresultsshowedthatthisfuzzyfunctionblurredtheimagetexture,protectedobjectcontour.ComparedwiththetraditionalCVsegmentationalgorithm,thisalgorithmsuppressedthetextureontheinfluenceoftheimagesegmentation,madeupfortheshortcomingsofthetraditionalCValgorithm.  
        关键词：imagesegmentation;textureblurring;anisotropy;levelset   
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      • Vol. 47, Issue 4, Pages: 118-124(2015) DOI: 10.15961/j.jsuese.2015.04.017
        摘要：Abstract:TosolvetheedgeconfusionprobleminthegraphvisualizationandshowGIS-relateddatainformation,theheatmapwasintroducedtorepresentthepathdatainformation,usingthemappingbetweenheatintensityandcolortopresentthefrequentmigrationofthepath,whichwasbasedonthegeographictrafficinformation-basededgebundlingalgorithm.Todealwithspeedmattersintheheatmapvisualization,thequadtreestructurewasemployedtodividetheregionandthenarticulatehotspotswithregionsaccordingtothedomainofinfluencetospeeduptheheatintensitycalculation.Theexperimentalresultsshowedthatthegeographictrafficinformation-basededgebundlingalgorithmwiththeintroductionofheatmaprealizestheintuitiverepresentationofheatintensityonthebasisofreducingthegraphconfusiondegreeeffectively.Theintroductionofquadtreestructuresignificantlyreducestheoperationtime,and themaximumspeedupisabout7.6,achievingagoodoperationeffect.  
        关键词：graphvisualization;geographictrafficinformation;heatmap;quadtree;edgebundling   
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      • Vol. 47, Issue 4, Pages: 125-131(2015) DOI: 10.15961/j.jsuese.2015.04.018
        摘要：Abstract:Current identity-based authenticated key agreement schemes still have restriction on PKG system parameters.The assumption limits the application in real network environment.In order to solve these problems,an identity-based cross-domain authenticated key agreement protocol was proposed.There is no restriction on PKG system parameters so that public system parameters,system master keys and system public keys can be totally different.The security of this scheme was analyzed under the eCK model,and the result showed that this protocol satisfies the basic security requirements,perfect forward secrecy and PKG forward secrecy.Moreover,this protocol is robust to the existing attacks such as key compromise impersonation attack and ephemeral key compromise impersonation attack. Comparison with some typical identity-based multi-domain authenticated key agreement protocols showed that this scheme is more secure and efficient.  
        关键词：identity-based;authenticatedkeyagreement;cross-domains;eCKmodel   
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      • Vol. 47, Issue 4, Pages: 132-135(2015) DOI: 10.15961/j.jsuese.2015.04.019
        摘要：Abstract:Awide-viewing-angleintegralimaging3Ddisplaywithoutcrosstalkwasproposedbyusingtwoorthogonallypolarizedsheetsandafillinglayerwithhighrefractiveindexmaterial.Oneoftheorthogonallypolarizedsheetswasattachedtothefrontofthedisplaypaneltoproducetheorthogonallylinearlypolarizedlights,andtheotheronewasaddedtothefrontofthemicro-lensarraytoblockthecrosstalkrays.Thefilinglayerwithhighrefractiveindexmaterialwaspaddedontothedisplaypaneltoenhancetheviewingangleofthe3Ddisplay.Thefeasibilityoftheproposed3Ddisplaywas verifiedbyusingthesimulationresults.  
        关键词：integralimagingthree-dimensionaldisplay;polarizedsheet;viewingangle;crosstalk   
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      • Vol. 47, Issue 4, Pages: 136-141(2015) DOI: 10.15961/j.jsuese.2015.04.020
        摘要：Abstract:Based on the through study of the problem to keep security in architectural refinement in MLS system,a refinement function and several refinement rules were presented to refine the architecture.The refinement function refined the security domain into several sub-domains.The relation between sub-domain and other security domains and the relation between sub-domains were limited by the refinement rules.Four theorems were given to prove that noninterference remains in the architecture after refinement.  
        关键词：downgrading architecture;noninterference;architecturerefinement;securitypolicyrefinement   
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      • Vol. 47, Issue 4, Pages: 142-149(2015) DOI: 10.15961/j.jsuese.2015.04.021
        摘要：Abstract:An optimization method was described to reduce the exclusive-or operations of the binary Vandermonde code.The encoding and decoding operation of the binary Vandermonde code was the bitwise exclusive-or.According to the distribution of the ones in the binary matrix and the relationship between the vectors,the calculation sequence of the parity chunk was determined ultimately.The test showed that the method can reduce the exclusive-or operations significantly by about 30%.Meanwhile,the method can be extended to other exclusive-or based storage systems  
        关键词：binary;datastorage;Vandermondecode;exclusive-oroperations   
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      • Vol. 47, Issue 4, Pages: 150-155(2015) DOI: 10.15961/j.jsuese.2015.04.022
        摘要：Abstract:Tosolvetheproblemofthemismatcherrorsbetweentheactualandpresumedsignalsteeringvectorsinairborneradarspace-timeadaptiveprocessing(STAP),arobustreduced-dimensionSTAPmethodbasedonbi-iterativealgorithm(BIA)andsecond-orderconeprogramming(SOCP)isproposed.FirstlytheweightvectorisdecomposedintotheKroneckerproductofthespatialandtemporalweightvectors.Thenbyimposingaboundontheerrorsbetweentheactualspatialandtemporalsteeringvectorsandthepresumedsteeringvectors,respectively,theoptimizationoftheworstcaseperformanceisexecutedandtransformedintotheSOCPformulation.FurthertheBIAisutilizedtoresolvethetwolowdimensionweightvectors,andfinallythefulldimensionSTAPweightvectorissynthesized.TheproposedmethodcansignificantlydecreasethetrainingsamplerequirementandthecomputationalcomplexitywhilemaintainingtherobustSTAPperformance,whichismorevaluableforpracticalengineeringapplication.Simulationresultsverifytheeffectivenessoftheproposedmethod.  
        关键词：airborneradar;space-timeadaptiveprocessing(STAP);robustness;dimensionreduction;bi-iterativealgorithm(BIA);second-orderconeprogramming(SOCP)   
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      • Vol. 47, Issue 4, Pages: 156-161(2015) DOI: 10.15961/j.jsuese.2015.04.023
        摘要：Abstract:In order to solve the problem that Boost transducers right-half-plane zero negative voltage cannot be accurately measured,a mathematical model of negative voltage was established.The effects of regulating energy storage inductors,input voltage,duty,duty cycle changes on the negative voltage was analyzed.The results showed that the input voltage and the duty ratio variation affect only the negative voltage；energy storage inductor,duty ratio,load,filter capacitor affects not only the negative influence of the size,at the same time,the peak time of negative voltage.Modeling results provided a theoretical basis to reduce the negative voltage and improved the response speed of the non minimum phase system.  
        关键词：Boost converter;non-minimum phase systems;negative voltage;modeling and analysis;peak time   
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      • Vol. 47, Issue 4, Pages: 162-167(2015) DOI: 10.15961/j.jsuese.2015.04.024
        摘要：Abstract:In order to improve the performance of failure recovery characteristic of the HVDC,a novel VDCOL control method named piecewise-variable-rate VDCOL is proposed based on the study of VDCOL’s influence on the HVDC system’s reactive power consumption and voltage stability,which divides the voltage drop or recovery process into several different stages which have different power recovery rate according to the voltage recovery level.The formula for calculating the initial value of the controller is derived；the strategy using Simplex algorithm to optimize the controller parameters is designed, and analyzed on the number of segments effect on performance and methods to determine it. The control effect is compared between the PVR-VDCOL and the linear VDCOL, and the control effect under different number of segments was compared. The simulation results in PSCAD/EMTDC showed that the proposed PVR-VDCOL control method can effectively improve the failure recovery performance of the HVDC system.  
        关键词：HVDC;VDCOL;voltagestability;Simplexalgorithm   
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      • Vol. 47, Issue 4, Pages: 168-175(2015) DOI: 10.15961/j.jsuese.2015.04.025
        摘要：Abstract:In order to meet the users’ needs,the demand-oriented innovation design model was proposed and the process of designing the steering was demonstrated based on this strategy.The demand-oriented innovative design model integrated user demand accessing,technology feature mapping,quality function deployment and innovative solutions generation.During the design stage,designers acquire the users’requirements and the corresponding technical features,apply House of Quality (HOQ) to build the mapping of requirements to technical features,and analyze the correlation and weights,then resolve corresponding technical contradictions with the aid of theory of inventive problem solving (TRIZ).In this strategy,the steering system meets the users’ needs and achieves the functions of power assisted steering and road feedback by making use of hydraulic system.  
        关键词：steering;road feedback;House of Quality (HOQ)   
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      • Vol. 47, Issue 4, Pages: 175-180(2015) DOI: 10.15961/j.jsuese.2015.04.026
        摘要：Abstract:To reveal the multiple-split load sharing mechanism among star gears of 2-stage star gearing system in aero-engine,based on a meshing error analysis made on eccentricity error,gear thickness error,base pitch error,assembly error,and bearing manufacturing error of gear components of the star gear train respectively,and the floating meshing error resulting from meshing clearance variation caused by the simultaneous floating of sun gear and annular gear considered,a refined mathematical model of 2-stage multiple-split loading sharing coefficient calculation was established with the consideration of displacement compatibility,and the load sharing coefficient of system of 1.049 was obtained.  
        关键词：displacementcompatibility;stargeartrains;multiple-splitloadsharing;powersplit   
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      • Vol. 47, Issue 4, Pages: 181-185(2015) DOI: 10.15961/j.jsuese.2015.04.027
        摘要：Abstract:According to the processing method and the principle of Gleason HGT hypoid gear,the theoretical tooth surface equation and the fillet surface equation of the gear were deduced based on the cradle machine.On this basis the three-dimensional model of the gear pair was established,the loaded tooth contact analysis was done,and the contact pattern,transmission error curve and load distribution factor of the gear pair were gotten in the simulation of real working condition.Then the correctness of the theory was validated through cutting test.The simulation and experiment results showed that the contact ratio of the gears is large,and the transmission is smooth.When the torque loaded on the gear is more than a certain value of 500 N·m the edge contact will appear.The study provided a reliable precondition for strength analysis and vibration analysis of the gear pair.  
        关键词：HGTmethod;hypoidgear;workingtoothsurface;filletsurface;LTCA;cuttingtest   
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      • Vol. 47, Issue 4, Pages: 186-191(2015) DOI: 10.15961/j.jsuese.2015.04.028
        摘要：Abstract:One method of CNC grinding disk wheel dresser and error impact analysis were proposed in order to improve the accuracy of face gear grinding.The motions of grinding face gear by disk wheel were analyzed based on the principle of face gear drive.The diamond wheel was selected for dressing according to the characteristics of the wheel tooth profile,and the trajectory curve of the diamond wheel was calculated and the method of CNC cutter sites and step size selection were proposed.The error type of the grinding wheel profile was analyzed,and the face gear tooth surface equation with error was given.The discrete points on the face gear tooth surface were fitted with MATLAB and CATIA software,and the impacts variation of wheel error on the face gear type surface was obtained.Finally,the experiment of dressing wheel and grinding face gear test were carried out, and the coordinate values of tooth surface points were detected with the maximum deviation of -10.1~12 μm.The results verified the proposed method.  
        关键词：processingfacegear;wheeldressing;accuracy   
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      • Vol. 47, Issue 4, Pages: 192-197(2015) DOI: 10.15961/j.jsuese.2015.04.029
        摘要：Abstract:Near infrared spectroscopy (NIR) technology with chemometric techniques was applied to fast analyze various parameters in the process of Simvastatin tablets producing.The four parameters including water content,compression force,tablet hardness and Simvastatin content were monitored by NIR quantitative analysis model,which used partial least squares (PLS) method.The correlation coefficient (R),root mean square error of calibration (RMSEC),root mean square error of prediction (RMSEP) and root mean square error of cross-validation (RMSECV) were used to assess the predictive ability and robustness of the different PLS models.The results showed that this method was validated for monitoring the four parameters in Simvastatin tablets production.  
        关键词：near infrared spectroscopy (NIR);partial least squares (PLS);Simvastatin   
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      • Vol. 47, Issue 4, Pages: 198-204(2015) DOI: 10.15961/j.jsuese.2015.04.030
        摘要：Abstract:In order to research the performance and excavate the organic carbon and energy source of the slaking fermentation sludge,the second fermentation of slaking fermentative sludge was made by adding the NaCl and NaOH into the fermentation sludge.Through adding 0,5,15,20 g/L NaCl,the effect of different salinity on the fermentation performance,the extracting situation of carbon source and dewatering performance of slaking fermentation sludge were investigated,respectively.The results showed that 5,15 and 20 g/L NaCl tests could promote the protein release and produce the volatile fatty acids,the maximum hydrolysis rate was 36%,acidification rate was 34%,ammonification was 40%.In the late fermentation,5g/L NaCl test accelerated the protein and volatile fatty acids.The results also showed that NH4+-N concentration increased and PO43--P decreased with the salnity rise.5 g/L NaCl test could improve the fermentation sludge dehydration property,but 15 and 20 g/L NaCl test deteriorated the fermentation sludge dehydration property.  
        关键词：slaking fermentation sludge;fermention;salinity;the volatile fatty acids;dehydration property   
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      • Vol. 47, Issue 4, Pages: 205-212(2015) DOI: 10.15961/j.jsuese.2015.04.031
        摘要：Abstract:The ability of aerobic granular sludge(AGS) to adsorb crystal violet(CV) from aqueous solutions was studied. Adsorption studies were carried out at different pH, adsorbent dosage, initial dye concentrations, NaCl concentration and temperature.Adsorption mechanism was measured through the adsorption isotherm and adsorption dynamics, thermodynamics and Fourier transform infrared spectroscopy(FTIR).The experimental results showed that the best adsorption condition was pH value of 2.0, adsorbent dosage of 2 g/L and temperature at 35 ℃.Equilibrium adsorption capacity(qe)was positive correlation with initial concentration of dye, but negative correlation with NaCl concentration.Adsorption datas were modeled using Langmuir and Freundlich adsorption isotherms.Equilibrium data of the adsorption process fitted very well to the Freundlich model.The results of kinetics study showed that the pseudo-second-order model fitted to the experimental data well.The thermodynamic parameters were evaluated.ΔH°>0, ΔS°>0 and ΔG°<0 demonstrated that the adsorption process was spontaneous and endothermic for dye.Furthermore the positive value of ΔS° reflected good affinity of the CV dye.The FTIR analysis indicated that functional groups on aerobic granular sludge would play an important role for the adsorption of the studied dye.These results showed that aerobic granular sludge could be effectively used as a low-cost adsorbent for the removal of CV dye from wastewater.  
        关键词：adsorption;kinetic;thermodynamics;aerobic granular sludge;crystal violet   
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      • Vol. 47, Issue 4, Pages: 213-218(2015) DOI: 10.15961/j.jsuese.2015.04.032
        摘要：Abstract:Polyacrylonitrile (PAN)/N,N-dimethylformamide (DMF) solution was used as raw material to prepare nanofibers through electrospinning method.Focusing electrode was used as the collecting device.Suspended electrospun fibrous assembly can be obtained with a high degree of alignment through the process.Effects of solution concentration,number of stainless steel bar,collecting distance,flow rate and rotation speed of electrode on the degree of alignment of fibrous assembly were studied.Results showed that aligned fibers can be obtained through collecting electrodes with both four and six stainless steel bars.Degree of alignment for the obtained fibers increases with the increase of solution concentration.Medium collecting distance is more suitable for the alignment of fibers.Fibrous array with a high degree of alignment can only be prepared at relatively low flow rate and voltage.Rotation of collecting electrode can deteriorate the alignment of fibers.  
        关键词：electrospinning;polyacrylonitrile;focusing electrode;alignment;nanofibers   
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