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1、大學(xué)畢業(yè)論文題目:土壤的物理機(jī)械性質(zhì)及其對車輛行駛性能的影響作者:學(xué)號:學(xué)院(系):專業(yè):指導(dǎo)教師:評閱人:中文摘要土壤的物理機(jī)械性質(zhì)及其對車輛行駛性能的影響中文摘要關(guān)鍵詞:土壤的物理機(jī)械性質(zhì),車輪與地面相對滑動,輪式車輛的牽引力土壤是工程機(jī)械的作業(yè)對象,又是其支承基礎(chǔ)。土壤的物理機(jī)械性質(zhì)直接影響工程機(jī)械的作業(yè)阻力、運行阻力,牽引性能及運行通過性。實際土壤是不同粒度土粒的混合物。不同粒度土粒的相對含量直接影響土壤的性質(zhì)。在車輪向前滾動的過程中,除了直觀的向前運行的滾動之外,在車輪與地面的接觸區(qū)內(nèi)的各個接觸點還存
2、在著不同程度的相對滑動。通過輪與地接觸面的摩擦產(chǎn)生驅(qū)動力,以及車輪在各接觸點的徑向變形的差異是產(chǎn)生車輪與地面相對滑動的基本原因。車輪與地面之間的相對滑動不僅影響車輪的運行速度,而且影響輪胎的磨損、能量消耗及整機(jī)的作業(yè)效率。驅(qū)動輪滾動過程中,即使=1,即從驅(qū)動輪整體而言,它作純滾動,則輪一地接觸區(qū)內(nèi)其余各點,輪與地之間仍存在著相對滑動,存在滑動摩擦。輪一地接觸區(qū)內(nèi)各單元面積的滑動摩擦力之總和就構(gòu)成了牽引力。19英文摘要Physicalandmechanicalpropertiesofthesoilanditsef
3、fectonvehicleperformanceAbstractKeyWords:Physicalandmechanicalpropertiesofthesoil,Relativeslidingwheelandtheground,WheeledvehicletractionSoilistheobjectofconstructionmachineryoperations,butalsothesupportingbase.Physicalandmechanicalpropertiesofthesoildirectl
4、yaffectstheoperationofconstructionmachineryresistance,runningresistance,tractionperformanceandrunthroughsex.Actualsoilisamixtureofdifferentsizesoilparticles.Therelativecontentofdifferentsizesoilparticlesdirectlyaffectthenatureofthesoil.Intheprocessofrollingt
5、hewheelforward,inadditiontointuitiveoperationofrollingforward,thewheelcontactwiththegroundineachregionthereisstillapointofcontactvaryingdegreesofrelativesliding.Accessthroughthewheelandthedrivingforceofthefrictionsurface,andthewheelsatallcontactpointsbetween
6、theradialdeformationofthewheelandthegroundistoproducethebasicreasonfortherelativesliding.Wheelsandthegroundnotonlyaffecttherelativeslidebetweenthewheelspeed,butalsoaffecttirewear,energyconsumptionandthemachine'soperatingefficiency.Wheelrollingprocess,evenif=
7、1,fromthewheelthewhole,itisforpurerolling,thewheelofapointofcontactwiththerestoftheregion,betweenthewheelandtheground,therearestillsliding,thereisslidingfriction.Roundaccesstotheregionofaunitareaoftheslidingfrictionofthetotalityoftraction.19長安大學(xué)08級本科地面力學(xué)論文目錄
8、中文摘要IABSTRACTII1.土壤的物理機(jī)械性質(zhì)31.1.土壤的粒度組成31.2.土壤的含水量與塑性31.3.土壤的密度與重度....................................................................................................................41.4.土壤的孔隙率與孔