机械工程专业英语文本施平02

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1、第2次课的教学整体安排授课时间第2周周4第3、4节课时安排2授课题目(教学章、节或主题)：Lubrication教学目的、要求（分掌握、理解、了解三个层次）：掌握本课的专业词汇学习并掌握专业英语的翻译技巧教学内容（包括基本内容、重点、难点）：LubricationVarietiesoflubrication;Functionsoflubricants;Otherfunctions讲解课文和专业词汇重点：在翻译的过程中句子表达的准确性和整篇文章的逻辑性。难点：在科技英语翻译过程中语言的转换技巧讨论、思考、作业：作业：复习课文背诵专业词汇参考资料（含参考书、文献等）：教学过程设计：复习10分

2、钟，授新课90分钟，安排讨论　分钟，布置作业　分钟授课类型：　理论课　讨论课　实验课　练习课　其他教学方式：　讲授　　讨论　　指导　　其他教学资源：　多媒体　　　模型　　　实物　　挂图　　　音像　　其他填写说明：1.每项页面大小可自行添减；2.教学内容与讨论、思考题、作业部分可合二为一。2Lubrication润滑Althoughoneofthemainpurposesoflubricationistoreducefriction,anysubstance–liquid,solid,orgaseous—capableofcontrollingfrictionandwearbetweens

3、lidingsurfaces(滑动表面)canbeclassedas(定义为)alubricant.VarietiesoflubricationUnlubricated(无润滑)sliding.Metalsthathavebeencarefullytreatedtoremoveallforeignmaterials(异物)seizeandweldtooneanotherwhenslidtogether.Intheabsenceof(如果没有)suchahighdegreeofcleanliness,adsorbed(吸附的)gases,watervapor,oxides(氧化物),and

4、contaminants(杂质)reducefrictionandthetendencytoseizebutusuallyresultinseverewear,thisiscalled“unlubricated”ordrysliding(干滑动).Fluid-film(流体膜)lubrication.Interposingafluidfilmthatcompletelyseparatestheslidingsurfacesresultsinfluid-filmlubrication.Thefluidmaybeintroducedintentionallyastheoilinthemain

5、bearing(主轴承)ofanautomobile,orunintentionally,asinthecaseofwaterbetweenasmoothrubbertire(橡胶轮胎)andawetpavement(路面).Althoughthefluidisusuallyaliquidsuchasoil,water,andawiderangeofothermaterials,itmayalsobeagas.Thegasmostcommonlyemployedisair.Tokeepthepartsseparated,itisnecessarythatthepressurewithin

6、thelubricationfilmbalance(与…保持平衡)theloadontheslidingsurfaces.Ifthelubricatingfilm’spressureissuppliedbyanexternalsource,thesystemissaidtobelubricatedhydro-statically(静压地).Ifthepressurebetweenthesurfacesisgeneratedasaresultoftheshapeandmotionofthesurfacesthemselves,however,thesystemishydro-dynamic

7、ally(动压地)lubricated.Thissecondtypeoflubricationdependsupontheviscousproperties(粘度特性)ofthelubricant.Boundarylubrication.Aconditionthatliesbetweenunlubricatedslidingandfluid–filmlubricationisreferredtoas(称作)boundarylubri