Huang Jinlin, Li Ziyu, Zhang Jianwei
Guangdong Research Institute of Water Resources and Hydropower, Guangzhou, 510635, China.
North China University of Water Resources and Electric Power, Zhengzhou, 450046, China.
Heliyon. 2024 Sep 4;10(18):e37411. doi: 10.1016/j.heliyon.2024.e37411. eCollection 2024 Sep 30.
The dike crossing pipeline is an important part of urban water transmission and supply projects. Identifying effective vibration analysis methods to determine the primary vibration sources and coupling vibration characteristics of pipelines is crucial for targeted vibration reduction and reinforcement of vulnerable pipeline sections. Therefore, this paper proposes a coupled vibration characteristics analysis method for the dike crossing pipeline based on EWT and CWT, taking the 6# dike crossing pipeline of Yang'er water plant in Foshan city, Guangdong province as the research object, firstly, the main vibration sources of the dike crossing pipeline are analyzed with the help of the prototype observation data using the mutual correlation power spectral, and the characteristics of the main vibration sources of the pipe are extracted using the empirical wavelet transform (EWT); then, focusing on the main vibration source, wavelet transform is used to analyze the source characteristics of the dike crossing pipeline; finally, the pipeline coupled vibration characteristics are analyzed using the cross wavelet transform (CWT). The research results show that: 1) The vibration of the 6# dike crossing pipeline of Yang'er water plant is mainly caused by the multiple rotational frequency such as 29.5 Hz, 36.5 Hz and the leaf frequency 59.0 Hz; 2) The EWT method can effectively remove the interference signal and extract the characteristic frequencies 29.5 Hz, 36.5 Hz and 59.0 Hz; 3) Analyzing the coupled vibration characteristics of the dike crossing pipeline based on the CWT, the peak energy of the coupled vibration of the 6# pipeline is generally concentrated at the frequency of 29.5 Hz, and the source of the coupled vibration is the multiple rotational frequency of the 6# pipeline unit. The results of this study can offer new insights into the identification of vibration characteristics of the dike crossing pipeline, and can provide technical support for the analysis of vibration characteristics and reduction needs of similar projects.
跨堤管道是城市输水供水工程的重要组成部分。识别有效的振动分析方法以确定管道的主要振动源和耦合振动特性，对于针对性地减少易损管段的振动并进行加固至关重要。因此，本文提出一种基于经验小波变换（EWT）和连续小波变换（CWT）的跨堤管道耦合振动特性分析方法，以广东省佛山市杨二水厂6#跨堤管道为研究对象，首先借助原型观测数据，利用互相关功率谱分析跨堤管道的主要振动源，并采用经验小波变换（EWT）提取管道主要振动源的特征；然后，针对主要振动源，利用小波变换分析跨堤管道的源特性；最后，采用交叉小波变换（CWT）分析管道耦合振动特性。研究结果表明：1）杨二水厂6#跨堤管道的振动主要由29.5Hz、36.5Hz等多重旋转频率以及叶片频率59.0Hz引起；2）EWT方法能有效去除干扰信号，提取29.5Hz、36.5Hz和59.0Hz特征频率；3）基于CWT分析跨堤管道耦合振动特性，6#管道耦合振动的峰值能量一般集中在29.5Hz频率处，耦合振动源为6#管道机组的多重旋转频率。本研究结果可为跨堤管道振动特性识别提供新的见解，并可为类似工程的振动特性分析及减振需求提供技术支持。
