外文翻译CNC加工加减速平稳变化的方法.doc外文翻译CNC加工加减速平稳变化的方法.doc

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南京工程学院自动化学院本科毕业设计(论文)1附录A英文资料AGENERALIZEDAPPROACHFORTHEACCELERATIONANDDECELERATIONOFCNCMACHINETOOLSJAEWOOKJEONDEPARTMENTOFCONTROLANDINSTRUMENTATIONENGINEERINGSUNGKYUNKWANUNIVERSITY300CHUNCHUNDONG,JANGANGU,SUWONCITY,KOREAABSTRACTMANYTECHNIQUESFORTHEACCELERATIONANDDECELERATIONOFCNCMACHINETOOLSHAVEBEENPROPOSEDINORDERTOMAKECNCMACHINETOOLSPERFORMGIVENMACHININGTASKSEFFICIENTLYSINCETHEYSHOULDBECALCULATEDINALIMITEDTIME,MOSTOFTHEMARENOTCOMPUTATIONALLYINTENSIVEHOWEVER,THESEPREVIOUSTECHNIQUESCANNOTGENERATEVELOCITYPROFILESHAVINGSOMEKINDSOFACCELERATIONANDDECELERATIONCHARACTERISTICSTHOUGHTHEYCANGENERATEVELOCITYPROFILESHAVINGVARIOUSACCELERATIONANDDECELERATIONCHARACTERISTICSTHISPAPERPROPOSESAGENERALIZEDAPPROACHFORGENERATINGVELOCITYPROFILESWHICHCANNOTBEGENERATEDBYPREVIOUSTECHNIQUESASWELLASVELOCITYPROFILESGENERATEDBYTHEMACCORDINGTOTHEDESIREDCHARACTERISTICSOFACCELERATIONANDDECELERATION,EACHSETOFCOEFFICIENTSISCALCULATEDANDISSTOREDGIVENAMOVINGDISTANCE,ANACCELERATIONINTERVAL,ANDADECELERATIONINTERVALFORCNCMACHINETOOLS,AVELOCITYPROFILEHAVINGTHEDESIREDCHARACTERISTICSOFACCELERATIONANDDECELERATIONCANBEEFFICIENTLYGENERATEDBYUSINGTHESECOEFFICIENTSITWILLBESHOWNHOWTOGENERATETYPICALVELOCITYPROFILESBYTHEPROPOSEDTECHNIQUEIINTRODUCTIONTHEDEMANDFORBETTERACCURACYINTHEMANUFACTURINGOFCOMPLICATEDPARTSANDTHEDESIRETOINCREASEPRODUCTIVITYHAVEDEVELOPEDCNCSYSTEMSSOTHATCNCMACHINETOOLSMOVEMOREACCURATELYANDMOREQUICKLYSINCETHECOMBINEDCHARACTERISTICSOFTHECONTROLANDTHEMACHINETOOLDETERMINETHEFINALACCURACYANDPRODUCTIVITYOFTHECNCSYSTEM,THEREAREMANYFACTORSTOCONSIDERFORIMPROVINGTHESEQUANTITIESONEOFTHEIMPORTANTFACTORSISEFFICIENTLYGENERATINGVELOCITYPROFILESWHICHHAVETHEDESIREDACCELERATIONANDDECELERATIONCHARACTERISTICSWHICHINTURNAREDETERMINEDACCORDINGTOGIVENMACHININGTASKSMANYRESEARCHERSHAVEPROPOSEDTECHNIQUESFORGENERATINGVELOCITYPROFILESOFCNC南京工程学院自动化学院本科毕业设计(论文)2MACHINETOOLSONEOFTHEMISGENERATINGVELOCITYPROFILESBYTHESELECTIONOFPOLYNOMIALFUNCTIONS1THISTECHNIQUECANGENERATESOMANYKINDSOFVELOCITYPROFILESANDFURTHERMORECANMAKETHECHARACTERISTICSOFDECELERATIONBEINDEPENDENTFROMTHATOFACCELERATIONTHEMAJORPROBLEMOFTHISTECHNIQUEISCOMPUTATIONALLOADTOINCREASEALMOSTEXPONENTIALLYWITHTHEORDEROFPOLYNOMIALINTHEACCELERATIONORTHATINTHEDECELERATIONDUETOTIMECONSTRAINTS,ITISVERYDIFFICULTTOAPPLYTHESETECHNIQUESTOCONTROLLINGCNCSYSTEMSOTHERPREVIOUSTECHNIQUESFORGENERATINGVELOCITYPROFILESISBASEDONADIGITALCONVOLUTION26THESETECHNIQUESAREMUCHMOREEFFICIENTTHANTHETECHNIQUESSELECTINGPOLYNOMIALFUNCTIONSANDAREEASILYIMPLEMENTEDBYAHARDWAREBUT,INVELOCITYPROFILESGENERATEDBYTHESETECHNIQUES,THEACCELERATIONINTERVALISALWAYSSAMEASTHEDECELERATIONINTERVALANDTHECHARACTERISTICSOFDECELERATIONAREDEPENDENTONTHATOFTHEACCELERATIONTHUS,SOMEVELOCITYPROFILESCANNOTBEGENERATEDBYTHESETECHNIQUESINTHISPAPER,AGENERALIZEDAPPROACHFORTHEACCELERATIONANDDECELERATIONOFCNCMACHINETOOLSISPROPOSEDTHEPROPOSEDTECHNIQUEISASSIMPLEANDEFFICIENTASTHETECHNIQUESBASEDONADIGITALCONVOLUTIONANDCANGENERATEVELOCITYPROFILESWHICHHAVEMOREVARIOUSCHARACTERISTICSOFACCELERATIONANDDECELERATIONTHANTHETECHNIQUESBASEDONADIGITALCONVOLUTIONCANTHATIS,THEPROPOSEDTECHNIQUECANGENERATEVELOCITYPROFILESOFWHICHTHEDECELERATIONCHARACTERISTICSAREINDEPENDENTFROMTHEACCELERATIONCHARACTERISTICSFIRST,SOMECOEFFICIENTSARECALCULATEDANDARESTOREDACCORDINGTOTHEACCELERATIONCHARACTERISTIC,THEDECELERATIONCHARACTERISTIC,ANDTHEACCELERATIONINTERVAL,ANDTHEDECELERATIONINTERVALTHENGIVENADESIREDMOVINGDISTANCE,AVELOCITYPROFILEWHICHHASTHEDESIREDCHARACTERISTICSISGENERATEDBYCALCULATINGTHEPOSITIONINCREMENTDURINGEACHSAMPLINGTIMETHEPOSITIONINCREMENTDURINGEACHSAMPLINGISCALCULATEDBYMULTIPLYINGTHESTOREDCOEFFICIENTSWITHTHEPRODUCTOFONESAMPLINGTIMEANDTHEVELOCITYAFTERACCELERATIONINSECTIONII,EXISTINGTECHNIQUESFORGENERATINGVELOCITYPROFILESOFCNCMACHINETOOLSWILLBEEXPLAINEDINSECTIONIII,ITWILLBEEXPLAINEDHOWTOGENERATEADESIREDVELOCITYPROFILEBYTHEPROPOSEDTECHNIQUETHEPROPOSEDTECHNIQUEANDOTHEREXISTINGTECHNIQUESWILLBECOMPAREDINSECTIONIV,ITWILLBESHOWNTHATTHEPROPOSEDTECHNIQUECANGENERATESOMEUSEFULVELOCITYPROFILESFORCNCMACHINETOOLSIIPREVIOUSTECHNIQUES南京工程学院自动化学院本科毕业设计(论文)3FORTHEILLUSTRATIONOFTHEPREVIOUSTECHNIQUES,LETUSCONSIDERONESINGLEAXISCONTROLSYSTEMOFWHICHTHEMAXIMUMVELOCITY,THEMAXIMUMACCELERATION,ANDTHESAMPLINGTIMEAREVMAX,AMAX,ANDTSRESPECTIVELYIFTHISSYSTEMMOVESTHEGIVENDISTANCESATTHEMAXIMUMVELOCITYVMAX,THENTHEMOVEMENTTIMET1INTHERECTANGULARVELOCITYPROFILEWILLBET1S/VMAXPTS,1SELECTINGANINTEGERNWHICHISTHESMALLESTINTEGERAMONGINTEGERSWHICHAREEQUALTOORGREATERTHANP,THERESULTINGRECTANGULARVELOCITYPROFILEISCONSTRUCTEDASINFIG1THEVELOCITYANDPOSITIONEQUATIONSFORTHISPROFILEARETHEPOSITIONINCREMENTDURINGEACHSAMPLINGTIMEIS0001/,14SSSPKTPKTPKTSNKNWHERE0SPKTAND01SPKTARETHEPOSITIONCOMMANDSATTHEKTHANDTHE1KTHSAMPLINGTIMESRESPECTIVELYTHATIS,THEPOSITIONINCREMENTDURINGEVERYSAMPLINGTIMEISTHESAMEHOWEVER,SINCENOPHYSICALSYSTEMCANACHIEVETHEABOVERECTANGULARVELOCITYPROFILEDUETOIMPULSEACCELERATION,THEACCELERATIONINTERVALTOINCREASEVELOCITYFROMTHERESTTOASPECIFIEDVALUEANDTHEDECELERATIONINTERVALTODECREASEVELOCITYFROMTHESPECIFIEDVALUETOTHERESTARENEEDEDIIASELECTIONOFPOLYNOMIALFUNCTIONSGIVENANACCELERATIONINTERVALTSNATS,ADECELERATIONINTERVALTDNDTSWHERENAND,ANDADISTANCES,ATRAPEZOIDALVELOCITYPROFILEWHICHHASTHELINEARACCELERATIONANDDECELERATIONCHARACTERISTICSCANBECONSTRUCTEDASINFIG2IFTHISPROFILEHASTHECONSTANTVELOCITYINTERVAL,THENNS/VMAXTSISLARGERTHANNATHEVELOCITYANDPOSITIONEQUATIONSFORTHISPROFILEAREAND1ASAASSSSASAASSTTTNTTSVTTTNTNTSTNSNTTNTTNTTNNT500/0,2/0,3SSVTSNTTNTPTSNTTNT南京工程学院自动化学院本科毕业设计(论文)4FIG1ARECTANGULARVELOCITYPROFILEFORMOVINGADISTANCESFIG2ATRAPEZOIDALVELOCITYPROFILEFORMOVINGADISTANCESINTHEABOVEDERIVATION,ITISASSUMEDTHATTHEACCELERATIONINTERVALISTHESAMEASTHEDECELERATIONINTERVALANDTHECONSTANTVELOCITYINTERVALISPRESENTINTHECASETHATTHEACCELERATIONINTERVALISDIFFERENTFROMTHEDECELERATIONINTERVALORTHECONSTANTVELOCITYINTERVALISNOTPRESENT,SIMILAREQUATIONSAREPOSSIBLETODERIVETHISTRAPEZOIDALVELOCITYPROFILEWHICHHASTHELINEARACCELERATIONANDDECELERATIONCHARACTERISTICSISPARTICULARLYEFFECTIVEFORCONTROLLINGAMACHINETOOLHAVINGAHIGHDEGREEOFRIGIDITYHOWEVER,LARGEJERKQUANTITYATTHESTOPPOINTINTHETRAPEZOIDALVELOCITYPROFILEMAYWEAROUTALEADSCREWASSEMBLYVERYQUICKLYANDBELIKELYTOMAKEMACHINETOOLSHAVINGLITTLERIGIDITYVIBRATESINCESMOOTHVELOCITYPROFILESWHICHHAVEPARABOLICSECONDORDERORHIGHERORDERACCELERATIONANDDECELERATIONCHARACTERISTICSDONOTHAVELARGEJERKQUANTITYATTHESTOPPOINT,THESEVELOCITYPROFILESAREVERYOFTENUSEDFORCNCMACHINETOOLS16SEVERALTECHNIQUESWHICHSELECTAPOLYNOMIALFUNCTIONFORGENERATINGVELOCITYPROFILESWITHSMALL2120222222ASAAASSSASSASAAASTTTNTTSPTTTTTNTNTSTNNTTTNTTNTTNTTNN6
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