2026年机械设计双语模拟试题(含答案)

2026年机械设计双语模拟试题(含答案)PartⅠMultipleChoiceQuestions(10questions,2pointseach,total20points)第一部分选择题（共10题，每题2分，共20分）说明：每道题给出4个选项，只有1个符合题目要求，将正确选项的字母填在题干后的括号内。Whenthepreloadoftheboltedconnectionisthesame,whichofthefollowingthreadhasthebestself-lockingperformance?当螺栓连接预紧力相同时，下列哪种螺纹的自锁性能最优？A.Triangularthreadwith30°pitchangle牙型角30°的三角螺纹B.Trapezoidalthreadwith30°pitchangle牙型角30°的梯形螺纹C.Rectangularthreadwith0°pitchangle牙型角0°的矩形螺纹D.Sawtooththreadwith3°workingfacepitchangle工作面牙型角3°的锯齿形螺纹WhichofthefollowingstatementsaboutelasticslidingofV-beltdriveiscorrect?关于V带传动的弹性滑动，下列说法正确的是？A.Elasticslidingiscausedbyinsufficienttensionofthebelt弹性滑动由带的张紧力不足导致B.Elasticslidingcanbecompletelyeliminatedbyincreasingthepreload弹性滑动可通过增大预紧力完全消除C.Elasticslidingwillcausethetransmissionratiotobeunstable弹性滑动会导致传动比不稳定D.Elasticslidingwillnotcausewearofthebeltworkingsurface弹性滑动不会造成带工作面磨损Forclosedhard-toothsurfacespurgeartransmission,themainfailureformofthegeartoothundersteadyloadis对于闭式硬齿面直齿圆柱齿轮传动，稳态载荷下轮齿的主要失效形式是A.Toothsurfacepitting齿面点蚀B.Toothrootfatiguefracture齿根疲劳折断C.Toothsurfacegluing齿面胶合D.Toothsurfaceplasticdeformation齿面塑性变形Theshaftthatonlybearsbendingmomentwithouttorqueiscalled只承受弯矩不承受扭矩的轴称为A.Transmissionshaft传动轴B.Spindle主轴C.Mandrel心轴D.Rotatingshaft转轴Thebasicratedlifeofrollingbearingreferstotheoperatinglifewhen滚动轴承的基本额定寿命是指何种情况下的工作寿命A.90%ofbearingsdonothavepittingfailure90%的轴承不发生点蚀失效

B.10%ofbearingsdonothavepittingfailure10%的轴承不发生点蚀失效

C.99%ofbearingsdonothavepittingfailure99%的轴承不发生点蚀失效

D.50%ofbearingsdonothavepittingfailure50%的轴承不发生点蚀失效

6.Whendesigningthenon-liquidlubricatedslidingbearing,thelimitvalueofPVvalueismainlytorestrict设计非液体摩擦滑动轴承时，PV值的限值主要是为了限制A.Excessivewearofbearingbush轴瓦过度磨损B.Excessivetemperatureriseleadingtogluing温升过高导致胶合C.Plasticdeformationofbearingbush轴瓦塑性变形D.Fatiguepittingofbearingbush轴瓦疲劳点蚀Whenthetransmissionsystemhaslargeimpactloadandfrequentpositiveandnegativerotation,whichofthefollowingcouplingsisthemostsuitable?传动系统载荷冲击大、频繁正反转时，最适合选用下列哪种联轴器？A.Rigidflangecoupling刚性法兰联轴器B.Slidercoupling滑块联轴器C.Gearcoupling齿轮联轴器D.Tyrecoupling轮胎式联轴器Theworkingsurfaceofordinaryflatkeyconnectionis普通平键连接的工作面是A.Topsurfaceofthekey键的顶面B.Bottomsurfaceofthekey键的底面C.Twosidesurfacesofthekey键的两侧面D.Allsurfacesofthekey键的所有表面Themainfactoraffectingthemeshingefficiencyofwormdriveis影响蜗杆传动啮合效率的主要因素是A.Wormheadnumber蜗杆头数B.Leadangleofworm蜗杆导程角C.Wormmodulus蜗杆模数D.Wormdiametercoefficient蜗杆直径系数Thefunctionofthespringinthesafetyvalveis安全阀中弹簧的功用是A.Cushioningandshockabsorption缓冲吸振B.Measuringforce测力C.Resettingandcontrollingmovement复位与控制运动D.Storingenergy储存能量AnswersforPartⅠ:1.A2.C3.B4.C5.A6.B7.D8.C9.B10.CPartⅡFillintheBlanks(10blanks,2pointseach,total20points)第二部分填空题（共10空，每空2分，共20分）说明：请将正确答案填写在题干的横线处，中英文答案均可，专业术语表述准确即可得分。Accordingtothefailuremechanismofboltedconnectionundervariableload,reducingthestiffnessof______(bolt/connectedpart)orincreasingthestiffnessof______(bolt/connectedpart)caneffectivelyreducethestressamplitudeofthebolt,thusimprovingthefatiguelifeofthebolt.根据变载荷下螺栓连接的失效机理，减小______（螺栓/被连接件）的刚度或增大______（螺栓/被连接件）的刚度可有效降低螺栓的应力幅，从而提升螺栓的疲劳寿命。ThemaximumstresspointoftheV-beltduringoperationislocatedat______.V带运行过程中的最大应力点位于______。Forthegeartransmissionwithcontactfatiguestrengthasthemainfailurecriterion,thehardnessofthesmallgeartoothsurfaceshouldbe______(higherthan/lowerthan/equalto)thatofthelargegeartoothsurface.以接触疲劳强度为主要失效判据的齿轮传动，小齿轮齿面硬度应______（高于/低于/等于）大齿轮齿面硬度。Whentheslidingbearingworksunderhydrodynamiclubrication,theminimumoilfilmthicknessmustbe______(greaterthan/lessthan/equalto)thesumofthesurfaceroughnessofthejournalandthebearingbushtoavoiddirectcontactbetweenthemetalsurfaces.滑动轴承在流体动压润滑下工作时，最小油膜厚度必须______（大于/小于/等于）轴颈和轴瓦的表面粗糙度之和，避免金属表面直接接触。Thetwomainbasesforselectingthetolerancegradeofrollingbearingare______and______.选择滚动轴承公差等级的两个主要依据是______和______。Thecoreconditionforrealizinghydrodynamiclubricationofslidingbearingisthatthetwofrictionsurfacesforma______gapwithrelativemovementalongthedirectionof______theoilwedge.滑动轴承实现流体动压润滑的核心条件是两摩擦面形成______间隙，且相对运动方向沿______油楔的方向。Whentheflatkeyconnectionfailstomeetthestrengthrequirement,twokeyscanbearrangedalongthecircumferenceatanintervalof______°,andtheloadcoefficientof1.5istakenduringstrengthcheckingtoconsidertheunevenloaddistribution.当平键连接强度不满足要求时，可沿圆周间隔______°布置两个键，强度校核时取1.5的载荷系数考虑载荷分配不均。AnswersforPartⅡ:bolt;connectedpart（螺栓；被连接件）thepositionwherethetightsideentersthesmallpulley（紧边进入小带轮处）higherthan（高于）greaterthan（大于）rotationaccuracyrequirementoftheshaft;workingspeed（轴的旋转精度要求；工作转速）convergent;converging（收敛；收敛）180（180）PartⅢTrueorFalseQuestions(10questions,1pointeach,total10points)第三部分判断题（共10题，每题1分，共10分）说明：判断下列表述是否正确，正确填“T”，错误填“F”。Theself-lockingofthreadedconnectionmeansthattheconnectionwillnotloosenautomaticallyevenunderimpact,vibrationandvariableload,sonoadditionalanti-looseningmeasuresareneeded.螺纹连接的自锁是指即使在冲击、振动、变载荷下连接也不会自动松脱，因此不需要额外的防松措施。TheratedpowerofV-beltdriveiscorrectedaccordingtotheactualworkingcondition,andthecorrectionfactorsincludeworkingconditionfactor,beltlengthcoefficient,wrapanglecoefficientandinclinationcoefficient.V带传动的额定功率需要根据实际工况进行修正，修正系数包括工况系数、带长系数、包角系数和倾角系数。Theloadfactorintroducedinthegearstrengthcalculationismainlyusedtoconsidertheadditionaldynamicloadcausedbythemanufacturingerroranddeformationofthegear.齿轮强度计算中引入的载荷系数主要用于考虑齿轮制造误差、变形等引起的附加动载荷。Thestaticstrengthcalculationoftheshaftissuitablefortheshaftthatbearssteadyloadforalongtime,andthefatiguestrengthcalculationissuitablefortheshaftthatbearsimpactload.轴的静强度计算适用于长期承受稳态载荷的轴，疲劳强度计算适用于承受冲击载荷的轴。Thebasicdynamicloadratingofrollingbearingreferstotheloadthatthebearingcanbearwhenthebasicratedlifeis1millionrevolutions.滚动轴承的基本额定动载荷是指轴承基本额定寿命为100万转时所能承受的载荷。Thepressureangleofthetoothprofileoftheinvolutesplineisusually30°,whichhastheadvantagesofhighcenteringaccuracyandlargebearingcapacity.渐开线花键的齿形压力角通常为30°，具有定心精度高、承载能力大的优点。Whendesigningthewormdrive,theheatbalancecalculationmustbecarriedoutbecausethelargeslidingspeedbetweenthetoothsurfaceswillleadtohightemperaturerise,whichiseasytocausegluingfailure.设计蜗杆传动时必须进行热平衡计算，因为齿面间滑动速度大导致温升较高，易引发胶合失效。Thediscspringhaslargestiffnessandsmallbufferingcapacity,soitissuitableforoccasionsrequiringsmallworkingstrokeandheavyload.碟形弹簧刚度大，缓冲能力小，因此适用于工作行程小、载荷大的场合。Theflexiblecouplingwithelasticelementcancompensatetherelativedisplacementofthetwoshafts,andalsohasthefunctionofbufferingandabsorbingvibration.带弹性元件的挠性联轴器既能补偿两轴的相对位移，又具有缓冲吸振的功能。Thewearofthechaindrivemainlyoccursonthepinshaftandthesleeve,sothecenterdistanceofthechaindrivewillincreasewiththeincreaseofservicetime,whichiseasytocausechaindropping.链传动的磨损主要发生在销轴和套筒上，因此链传动的中心距会随使用时间增长而增大，易引发掉链。AnswersforPartⅢ:1.F2.T3.T4.F5.T6.T7.T8.F9.T10.TPartⅣShortAnswerQuestions(2questions,10pointseach,total20points)第四部分简答题（共2题，每题10分，共20分）说明：第1题要求中英文双语作答，每种语言表述占5分；第2题可选择中文或英文作答，专业术语准确、逻辑清晰即可得分。Question:PleasecomparethedifferencesbetweenelasticslidingandslippingofV-beltdrivefromtheaspectsofcause,property,consequenceandeliminationmethod.问题：请从产生原因、性质、后果、消除方式四个方面对比V带传动弹性滑动与打滑的区别。ReferenceAnswer:EnglishVersion:Cause:Elasticslidingiscausedbytheelasticdeformationofthebeltandthetensiondifferencebetweenthetightsideandtheslackside;slippingiscausedbytheoverloadofthebeltdrive,theeffectivecircumferentialforceexceedsthemaximumfrictionforcebetweenthebeltandthepulley.Property:Elasticslidingisaninherentcharacteristicofbeltdrive,whichisunavoidable;slippingisafailureformofbeltdrive,whichcanbeavoided.Consequence:Elasticslidingwillleadtothelagofdrivenwheelspeed,unstabletransmissionratioandsmallwearofbeltsurface;slippingwillcauseseverewearofthebelt,thetransmissionfailscompletely,andtheservicelifeofthebeltisgreatlyreduced.Eliminationmethod:Elasticslidingcannotbeeliminated;slippingcanbeeliminatedbyreducingworkingload,increasingpreload,increasingthewrapangleofsmallpulley,etc.中文版本:产生原因：弹性滑动由带的弹性变形以及紧边、松边的拉力差导致；打滑由带传动过载，有效圆周力超过带与带轮间的最大摩擦力导致。性质：弹性滑动是带传动的固有特性，不可避免；打滑是带传动的失效形式，可避免。后果：弹性滑动会导致从动轮转速滞后、传动比不稳定、带面轻微磨损；打滑会造成带的剧烈磨损、传动完全失效、带的使用寿命大幅降低。消除方式：弹性滑动无法消除；打滑可通过降低工作载荷、增大预紧力、增大小带轮包角等方式消除。Question:Pleaseexplainthereasonswhythecontactfatiguestrengthofthesmallgearshouldbecheckedfirstwhendesigningtheclosedsoft-toothsurfacegeartransmission,andputforward3measurestoimprovethecontactfatiguestrengthofthegear.问题：请说明设计闭式软齿面齿轮传动时应优先校核小齿轮接触疲劳强度的原因，并提出3种提升齿轮接触疲劳强度的措施。ReferenceAnswer:Reason:Ingeartransmission,thenumberofstresscyclesonthesmallgeartoothsurfaceismuchhigherthanthatofthelargegear,andtherelativeslidingspeedonthesmallgeartoothsurfaceishigher,whichismorepronetopittingfailure.Atthesametime,underthesamecontactstress,thetoothsurfacewithlowerhardnessismorepronetopitting,andthesmallgeartoothsurfacehardnessisusuallyonly30~50HBShigherthanthelargegear,sothecontactfatiguestrengthofthesmallgearisweaker,anditshouldbecheckedfirst.Measures:(1)Increasethehardnessofthegeartoothsurface,suchascarburizingandquenching,surfacequenchingandotherheattreatmentprocesses;(2)Appropriatelyincreasethetoothwidthcoefficientorreducethepressureangletoreducethecontactstressperunitarea;(3)Improvethemachiningaccuracyofthegeartoothsurface,reducethesurfaceroughness,andavoidstressconcentrationcausedbysurfacedefects.中文参考解答：原因：齿轮传动中，小齿轮齿面的应力循环次数远高于大齿轮，且小齿轮齿面的相对滑动速度更高，更易发生点蚀失效。同时，相同接触应力下，硬度更低的齿面更易发生点蚀，而小齿轮齿面硬度通常仅比大齿轮高30~50HBS，因此小齿轮的接触疲劳强度更弱，应优先校核。措施：（1）提高齿轮齿面硬度，如采用渗碳淬火、表面淬火等热处理工艺；（2）适当增大齿宽系数或减小压力角，降低单位面积接触应力；（3）提高齿轮齿面加工精度，降低表面粗糙度，避免表面缺陷引发的应力集中。PartⅤCalculationandAnalysisQuestions(2questions,15pointseach,total30points)第五部分计算分析题（共2题，每题15分，共30分）说明：需写出完整计算过程，结果保留两位小数，单位标注清晰，可选择中文或英文作答。Aboltedconnectionisusedtofastenahydrauliccylindercover,theparametersareasfollows:theinnerdiameterofthecylinderD=200mm,theworkingpressurepchangesbetween0~1.5MPa,thenumberofboltsz=8,theboltstiffnessCb=1×10^6N/mm,theconnectedpartstiffnessCm=4×10^6N/mm,theallowabletensilestressofthebolt[σ]=120MPa,theresidualpreloadafterbearingtheworkingloadisrequiredtobenotlessthan30%ofthemaximumworkingloadofasinglebolt.Tryto:(1)CalculatetherequiredminimumpreloadF0ofthebolt;(8points)(2)Checkwhetherthetensilestrengthoftheboltmeetstherequirementwhenthenom