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。
关键词：出水塔结构;环境激励;时域辨识;有限元模拟
中图分类号：TV675;TV32 文献标志码：A 文章编号：1672-1683（2015）04-0699-05
Identification of modal parameters of water-outlet tower of pumping
station under operational excitation conditions
XU Cun-dong，LIU Hui，WANG Ya-nan，NIE Jun-kun，WANG Rong-rong，SHI Guo-kun
（School of Water Conservancy，North China University of Water resources and Electric Power/Collaborative Innovation
Center of Water Resources Efficient Utilization and Protection Engineering，Zhengzhou 450045，China）
Abstract：The water-outlet tower of high-lift pumping station can vibrate seriously and even fail under the excitation of flow.In order to study the vibration characteristics of water-outlet tower，accurate identification of its modal parameters is necessary.In this paper，the vibration signals of a water-outlet tower under the operational excitation conditions were collected in the No.6 pumping station of Jingdian phase II project in Gansu Province.According to the measured vibration data，the modal parameters of the water-outlet tower were identified using two time-domain identification methods，including the stochastic subspace identification and eigen system realization algorithm.The identification results were compared with the simulated results determined by ANSYS finite element method.The results showed that both methods can identify the modal parameters of the water-outlet tower accurately and the identification results are in good agreement with the simulation results obtained from ANSYS finite element method.The research can not only provide the theoretical basis for the renewal design and safe operation monitoring of the water-outlet tower，but also offer the technical references for the identification of modal parameters of the hydraulic structures in the irrigation district.
