简介：Thecombustion(ballistic)propertiesofahighsolidloadingcompositesolidpropellantfamily(Butalites)wasstudiedexperimentallybyusingpropellantformulationsbasedonhydroxy-terminatedpolybutadienepre-polymer(HTPB)asafuelbindermainbackbone,bi-modalsystemammoniumperchlorateoxidizer(AP)andaluminumpowder(Al)asmetallicfuel.Burningratesweredoubledatvariouspressures,whensolidsloading(APand17%Al)wereincreasedfrom80to88%andthemeasuredcharacteristicvelocityvalueswereincreasedbyabout100m/sec.Thepressureexponent(n)valueswerelowerwith80-85%solidsloading.Theburningrateswereincreasedbyabout2-5%whencomparingthedataobtainedbystaticfiringwiththoseobtainedbythestrandburnermethod.
简介：ThispaperdevelopsastrongsecondarydevelopmentbasedonADAMSfeaturewhichcreateshigh-speedrailbearingsforsimulationanalysismodule.Thisthesisisinthecaseofnon-circularpatterninstructionsofhowtoachieverapidrollermodeling,withanalysisoffunctionsandparametersrequiredforthedesignofthesimulationmoduleofthehigh-speedrailbearing,aswellasthedesignofdialogboxes,theenvironmentandfilestructure.ThespecificmodulesisbasedonthesecondarydevelopmentlanguageprovidedbyADAMS/View.Throughthemenus,dialogboxeswhichinputparameters,itcanachievehighironbearingautomaticmodeling,dynamicanalysisandpost-processingtosimplifytheanalysisofhigh-speedrailbearingoperations,aswellasimprovingthehigh-speedrailbearingdevelopmentefficiency.
简介：Akindofdrivecircuitwhichislowpowerconsumption,high-performanceandhigh-poweroutputforsteppingmotor,basedonBY-5064,andakindofdedicatedcircuitfortwo-phasehybridsteppingmotoraredesigned,drivecontrolforsteppingmotorwithhigh-powerisachieved.
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