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时间:2017-12-08
《可倾瓦轴承动态特性计算模型与方法研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第54卷第2期汽轮机技术Vo1.54No.22012年4月TURBINETECHNOL0GYApr.2012可倾瓦轴承动态特性计算模型及方法研究纪峰,袁小阳,张宏涛,席文奎(1西安交通大学现在设计及转子轴承系统教育部重点实验室,西安710049;2哈尔滨汽轮机厂有限责任公司,哈尔滨150046)摘要:可倾瓦轴承由于具有良好的制振性及高稳定性等特征,目前被广泛应用于各种旋转机械。但由于可倾瓦轴承瓦块的摆动性,增加了系统的自由度,所以可倾瓦轴承线性动力系统的建模及计算方法较之固定瓦轴承要复杂的多。根据建模方法的不同,可倾瓦
2、计算模型主要分为常规八系数模型、频变八系数模型、完整动力学系数模型3种。结合某引进机组大型可倾瓦轴承为研究对象,对可倾瓦轴承动态特性3种计算模型及方法进行了研究。并对计算中不计热弹变形及考虑热弹耦合效应下的轴承常规八系数动特性进行了计算,并对频变八系数模型进行了分析计算。结果表明:考虑瓦块热弹变形的可倾瓦轴承动特性系数计算结果精度较高,取消瓦块摆动频率与转子转频相同的假设的模型可望获得更高的精度。关键词:频变;热弹耦合;完整动力学;动特性分类号:TK234.4文献标识码:A文章编号:1001—5884(2012)02-
3、0105-04TheMethodandCalculationModelofDynamicPerformancesof0il..filmofTilting.padBearingJIFeng,YUANXiao-yang,ZHANGHong—t,XIWen—kui(1KeyLaboratoryofEducationMinistryforModemDesignandRotor—bearingSystem,Xi’anJiaotongUniversity,Xi’an710049,China;2HarbinTurbineCompan
4、yLimited,Harbin150046,China)Abstract:Tilting—padbeatingsystemiscurrentlywidelyusedinrotatingmachineryduetogoodvibrationcharacteristicsandhighstability.However,becauseoftheswingoftihing—padbeatingpad,increasingthesystemdegreesoffreedom,SOthemodelingandcalculation
5、methodsoftilting—padbeatinglineardynamicsystemsaremuchmorecomplexthanthefixedpadbeatings.Accordingtothedifferentmodelingapproaches,thecalculationofmodeltilting-wattisdividedintothreetypes,includingregulareightfactormodel,frequency—dependenteightcoeficientmodel,t
6、hefulldynamicfactormode1.Inthispaper,theintroductionofalargetilting—padbeatingunitforthestudy,dynamiccharacteristicsoftilting·padbearingthreekindsofcalculationmodelsandmethodshavebeenstudied,andthebearinginexcludingthermo—elasticdeformationandnotconsiderthermopl
7、asticeffect,dynamiccharacteristicsofconventionaleightcoefficientswerecalculated,whilemodelofthefrequency—dependenteightcoeficientwereanalyzedandcalculated.Theresultsshowedthat:Itisexpectedtoassumeahighermodelaccuracy,considerthethermoplasticdeformationofthepadti
8、lting—padbeatingdynamiccoeficientsofhighaccuracy,Cancelmodelofthesameassumptionsoftilebeatfrequencyandrotor~equeneytransfer.Keywords:frequency-dependent;thermoplastic
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