环境激励下泵站出水塔结构模态参数辨识研究 |
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作者姓名: | 徐存东 刘 辉 王亚楠 聂俊坤 王荣荣 史国坤 |
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作者单位: | 华北水利水电大学 水利学院 资源高效利用与保障工程河南省协同创新中心,郑州,450045 |
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基金项目: | 国家自然科学基金资助项目( 51279064; 31360204) ; 河南省教育厅科技创新人才支持计划( 14H AST IT047) ; 河南省高校科技创
新团队支持计划( 14IRTST H N028) ; 华北水利水电大学2014 年大学生创新计划项目( HSCX2004063; H SCX2004064) |
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摘 要: | 高扬程提水泵站的出水塔结构在水流的激励作用下易出现剧烈振动甚至由此造成破坏,为研究其振动特性需对其结构模态参数进行准确辨识。以甘肃景电二期工程总干六泵站的出水塔为例,在工作荷载激励下对其振动信号进行现场采集,根据实测的结构振动时程,利用随机子空间法和特征系统实现算法分别对出水塔结构的模态参数进行时域辨识,并将其辨识结果与ANSYS三维有限元模拟结果进行对比验证。结果表明:随机子空间法和特征系统实现算法均能准确辨识出水塔结构模态参数,其模拟结果与实验结果吻合较好。研究成果可为泵站出水塔结构的更新改造设计和安全运行监测提供理论依据,同时能够为灌区水工结构的模态参数辨识提供技术参考。
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关 键 词: | 出水塔结构 环境激励 时域辨识 有限元模拟 |
Identification of modal parameters of water2outlet tower of pumping
station under operational excitation conditions |
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Authors: | XU Cundo ng LIU H ui WANG Yanan NIE Junkun WANG Ro ngro ng SH I Guokun |
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Affiliation: | School of Water Conser vancy , No rth China Univer sity of Water r esour ces and El ectr ic Pow er / Collabor ative I nnov ation
Center of Water Res our ces Ef f icient Utiliz atio n and P r otection Engineer ing , Zhengz ho u 450045, China |
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Abstract: | The wat er2outlet tow er of hig h2lift pumping station can v ibr ate serio usly and even fail under the ex citatio n o f flow. In
order t o study the v ibration char acter istics of w ater2outlet t ow er, accurate identificatio n of its mo dal par amet ers is necessar y. In
this paper, the v ibration signals o f a w ater2outlet tower under the operational ex citation conditio ns w ere co llected in the No. 6
pumping statio n of Jing dian phase II project in Gansu Prov ince. Acco rding to the measured vibrat ion data, the modal parameter s
of the w ater2o ut let tow er w ere identif ied using two t ime2domain identification metho ds, including the sto chastic subspace ident i2
ficat ion and eig en sy stem r ealization alg or ithm. The identification results w ere com par ed w ith t he simulated results determined
by ANSYS finite element method. The results show ed that both metho ds can identify the mo dal par ameters of the water2outlet
tow er accurately and the identificat ion results ar e in go od ag reement w ith the simulat ion results o bt ained from ANSYS finite el2
ement metho d. The research can not o nly pr ovide the t heo retical basis for the renewa l design and safe operation monito ring of
the w ater2o ut let tow er, but also offer the technical r eferences fo r the identification of mo dal parameters o f the hydraulic struc2
tur es in the ir rigation distr ict. |
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Keywords: | w ater2outlet tower o perat ional ex citation time2domain identification finite element simulation |
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