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时间:2019-05-17
《核电站百万千瓦级半速汽轮发电机组弹簧隔振基础强迫振动模型试验探讨》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、维普资讯http://www.cqvip.com—匠曩团E冒⋯⋯⋯.一燕电亘互王巨熟婆篓垄皇筻陋薹理迫辗型进核电站百万千瓦级半速汽轮发电机组弹簧隔振基础强迫振动模型试验探讨周雷靖,沙曾圻,尹春明,何喜洋(1.广东省电力设计研究院,广东广州510600;2.隔而固(青岛)振动控制有限公司,山东青岛266108)摘要:对汽轮发电机组弹簧隔振基础进行模型试验的最根本理论是相似理论,最关键的技术是模态分析。本文利用相似理论与模态分析的传递函数矩阵方程,推导了强迫振动模型试验的相似准则方程,确定了r阶模态的决定性相似准则为r阶阻
2、尼比D与r阶调谐比,7,非决定性相似准则为振动线位移组合量。对百万千瓦级半速核电站汽轮发电机组弹簧隔振基础的强迫振动进行模型试验时,各阶模态的阻尼比与调谐比必须相等,但是模型与原型的各阶阻尼比是否能够做到相等,缺乏验证。而且目前阻尼比取值不太合理,模型试验没有给出有益的建议。振动系统包括汽轮发电机组、基础台座、弹簧隔振器与阻尼器等,模型试验在机器的激振频率、激振力强度与分布等方面难于满足相似理论。模型试验在满足弹簧隔振器的刚度、压缩量与系统频率要求时也有困难。关键词:弹簧隔振基础;相似理论;模型试验。中图分类号:TM6
3、21文献标志码:A文章编号:1671—9913(2007)04—0051—04AStudyonForcedVibrationModelTestofSpringSupportedFoundationHalfSpeed1000MWT/GatNuclearPowerPlantZHOULei—jing,SHAZeng—xin,YINChun—ming,HEXi—yang(1.GuangdongElectricPowerDesignResearchInstitute,Guangzhou510600,China;2.GERB(Qi
4、ngdao)VibrationControlSystemCo.Ltd.,Qingdao266108,China)Abstract:Thebasistl1eoryandthekeymethodforthemodeltestofthespringsupportedT/Gfoundationisthesimilarityoneandthemodalanalysis.Asimilarcriteriaequationisdeductedfortheforcedvibrationmodeltestofthespringsuppor
5、tedT/Gfoundationwiththesimilartheo~andfromthetransmissionfunctionmarxequationinthispaper.TwodeterminantcriteriaforrorderofvibrationmodalarerorderofthedampingratioDandthetuningratioAnindeterminatecriterionisacompoundoftherorderofthedisplacement,theexcitationandth
6、espringr.rate.Asaresult,eachorderofthedampingratioandthetuningratioforthemodelmustbeequaltothosefortheprototypeduringthemodeltest,butwhichisstillnotproved.Currently,thedampingratiogivenbythenationalcodesisnotveryreasonable,andthemodeltestsfinishedinthepastdidnot
7、giveUSanyvaluablesuggestion.ThevibrationsystemiscomposedoftheT/Gset,thefoundationblock,thespringelementsandthedampe~.Themodeltestisdificulttobesimilartotheexcitingfrequency,excitationsandtheactingpointsofT/Gsetonthefoundationblock.Thesimilarityisalsodifficulttob
8、efollowedinthestifnessandthecompressionofthespringelementsandthesystemnaturalfrequency.Keywords:springsupportedfoundation;similaritytheory;modeltest.}收稿日期:2007—05—17作
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