基于SVD-TE的高拱坝泄流振动传递路径识别  

SVD-TE Based High Arch Dam Discharge Vibration Transmission Path Identification

作　　者：李紫瑜 张建伟 黄锦林[3] 曹克磊 江琦 杨灿 LI Ziyu;ZHANG Jianwei;HUANG Jinlin;CAO Kelei;JIANG Qi;YANG Can(School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Collaborative Innovation Center for Efficient Utilization of Water Resources,Zhengzhou 450046,China;Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510610,China)

机构地区：[1]华北水利水电大学水利学院,河南郑州450046 [2]黄河流域水资源高效利用省部共建协同创新中心,河南郑州450046 [3]广东省水利水电科学研究院,广东广州510610

出　　处：《华北水利水电大学学报（自然科学版）》2024年第4期69-76,101,共9页Journal of North China University of Water Resources and Electric Power：Natural Science Edition

基　　金：国家自然科学基金项目(51679091);广东省水利科技创新项目(2020-18);华北水利水电大学创新课题(YK-2021-30)。

摘　　要：针对泄流激励下高拱坝坝身振动机理不明确、振动传递路径复杂的问题,提出基于奇异值分解法和传递熵法的振动传递路径的识别方法。基于拉西瓦拱坝水弹性模型表深孔联合泄流工况的实测数据,开展拱坝振动传递路径的研究。首先,基于SVD算法对拉西瓦拱坝坝身测点振动位移数据降噪处理;然后,运用传递熵算法,根据测点振动信息探索高拱坝泄流振动的主要振动传递路径,并结合已有研究成果验证振动传递路径的准确性。研究结果表明:拉西瓦拱坝在表深孔联合泄流工况下,泄流荷载诱发的振动主要由泄流孔处垂向传递至坝顶,泄流孔向拱冠梁顶部的信息传递率为48.7%;水垫塘冲击荷载与涌浪荷载诱发的振动主要由坝肩向坝中部水平传递,坝肩向1/4和3/4拱冠处的信息传递率分别为32.33%和37.58%;泄流振动在坝体处的传递路径有3条:泄流孔→拱冠梁顶部→1/4(3/4)拱冠、泄流孔→1/4(3/4)拱冠、水垫塘→坝肩→1/4(3/4)拱冠。本研究成果可为高拱坝泄流振动传递路径提供理论依据,为类似工程的振动机理分析提供参考。Aiming at the problems of unclear vibration mechanism and complex vibration transmission path of high arch dam under discharge excitation,the identification method of vibration transmission path on the basis of Singular Value Decomposition(SVD)and Transfer Entropy(TE)is proposed.For the measured data of the hydro-elastic model discharge conditions of the Laxiwa arch dam, the vibration transmission path of the arch dam is studied. Firstly, the SVD algorithm is ap-plied to the vibration data of the Laxiwa arch dam measure points to reduce noise;secondly, the TE algorithm is used to ex-plore the main vibration transmission paths of high arch dam discharge vibration based on vibration information from meas-ure points, and the accuracy of the vibration transmission paths is verified with existing studies. The results of the study show that, under the Laxiwa arch dam discharge working conditions, the vibration induced by the discharge load is mainly transmitted vertically from the discharge hole to the top of the dam, and the information transmission rate from the discharge hole to the top of the arch crown beam is 48. 7%;the vibration induced by the impact load and surge load of the water cush-ion pool is mainly transmitted horizontally from the abutment to the middle of the dam, and the information transmission rate from the abutment to the arch crown is 32. 33% and 37. 58%, respectively;there are three paths for the transmission of the discharge vibration in the dam body, it is that discharge hole → top of the arch crown beam → 1/ 4 (3/ 4) of the arch crown, discharge hole → 1/ 4 (3/ 4) of the arch crown, and water cushion pond → shoulder of the dam → 1/ 4 (3/ 4) of the arch crown. This study can provide a reference for the transmission path of water discharge vibration of high arch dams and provide a theoretical basis for the vibration mechanism analysis of similar projects.

关 键 词：拱坝 泄流振动 奇异值分解 传递熵 

分 类 号：TV642.42[水利工程—水利水电工程]