机械工程专业英语课翻译.docx

机械工程专业英语课翻译

第一篇：机械工程专业英语课翻译Unit1Twomethodsofdesignatinglimitdimensionsareconsideredasstandard.Onemethodisthemaximummaterialmethodinwhichthelargedimensionisplacedabovethesmallerdimensionformaleparts,andthereverseistrueforfemaleparts.Thismethodiswellsuitedforsmalllotquantitiesbecauseitislikelythatthemachinisthimselfmaycheckthedimensionoftheparts.Insodoinghewillbeverifyinginitiallythelargedimensionofthemalepartsandthesmallerdimensionofthefemalepart.othermethodisthemaximumnumbermethodandispreferredbyproductionandqualitycontroldepartments.Inthismethodofdesignatingadimension,thelargenumberisalwaysplacedabovethesmallernumber,regardlessofwhetherthepartismaleorfemale.两种方法都被看作是指定极限尺寸标准。一种方法是最大的资料法,大尺寸较小的尺寸摆在上面男性部件,事实正相反对女性的部分。这种方法很适合小批量的数量,因为它是可能的,自己可能检查机械师维度的零件。这样做的话,他就会验证最初的男大尺寸零件和小尺寸的女性的部分。另一个方法是最大的数字方法和优先生产和质量控制部门。在该方法中,指定了一个维度,大量总是摆在上面较小的号码,不管部分男”或“女”。Unit3(1)Fromitsinception,quantummechanicshadtwoapparentlydifferentmathematicalforms:thewavemechanicsofE.Sehrodinger,whichemphasizesthespatialprobabilitydistributionsinthequantumstates,andthematrixmechanicsofW.Heisenberg,whichemphasizesthetransitionsbetweenstates.成立以来,量子力学有两个明显不同的数学形态E.Sehrodinger波动力学的,它强调在空间概率分布的量子状态时,矩阵力学的W.Heisenberg,他们(2)therigid-bodyassumptioncannotbeusedwheninternalstressesandstrainsduetotheappliedforcesaretobeanalyzed.Thusweconsiderthebodytobecapableofdeforming.suchanalysisisfrequentlycalledelastic-bodyanalysis,usingtheadditionalassumptionthatthebodyremainselasticwithintherangeoftheappliedforce.在刚体假设时不能用内部的紧张和压力是由于受力进行分析。因此我们认为身体能变形。这样的分析常被称为elastic-body分析,利用附加假设物体保持弹性范围内应用的力量。Unit4Therelationvelocityorvelocitypolygonmethodofperformingavelocityanalysisofamechanismisoneofseveralmethodsavailable.Thepolerepresentsallpointsonthemechanismhavingzerovelocity.Linesdrawnfromthepoletopointonthevelocitypolygonrepresenttheabsolutevelocitiesofthecorrespondingpointonthemechanism.Alineconnectinganytwopointonthevelocitypolygonrepresentstherelativevelocityforthetwocorrespondingpointsonthemechanism.速度或速度的关系,执行一个多边形方法速