基于时频域信号特征的输电塔运行模态分析  

The Operational Modal Analysis of Transmission Towers Based on Time-Frequency Domain Signal Characteristics

作　　者：张晓明 谭蓉 贺育明 强继峰 孙森林 张朝军 梁刚[3] ZHANG Xiaoming;TAN Rong;HE Yuming;QIANG Jifeng;SUN Senlin;ZHANG Chaojun;LIANG Gang(State Grid Shaanxi Electric Power Co.,Ltd.,Xi’an 710075,Shaanxi,China;China Energy Construction Group Shaanxi Electric Power Design Institute Co.,Ltd.,Xi’an 710054,Shaanxi,China;Xi’an University of Technology,Xi’an 710048,Shaanxi,China)

机构地区：[1]国网陕西省电力有限公司,陕西西安710075 [2]中国能源建设集团陕西省电力设计院有限公司,陕西西安710054 [3]西安理工大学,陕西西安710048

出　　处：《电网与清洁能源》2025年第3期46-52,59,共8页Power System and Clean Energy

基　　金：中国博士后科学基金项目(2022M712562);陕西省自然科学基础研究计划项目(2023-JC-YB-309)。

摘　　要：运行模态分析是现阶段对大型结构进行动力特性参数分析的重要手段。首先,采集了110 kV输电塔环境激励下的响应时程;其次,采用短时傅里叶变换配合不同时间窗口下的时频域强度信息的方法,得到了响应信号的时频图,讨论了环境激励下响应时程的频域响应特征;最后,采用了随机子空间方法,获得了结构的动力特性参数。研究结论表明,环境激励可为运行模态分析提供持续稳定激励;试验塔的一阶模态能量耗散能力较强,在垂直横担方向阻尼比数值随着模态频率增加有减小的趋势。试验部分可为服役输电塔的监测、维护提供参考,形成的结论可为输电塔的抗风设计提供参考。Operational modal analysis is an essential means for evaluating the dynamic characteristic parameters of largescale structures at the current stage.This study initially collected response time histories under the environmental excitation of a 110 kV transmission tower;subsequently,by using the shorttime Fourier transform combined with the time-frequency domain intensity information under different time windows,the time-frequency diagram of the response signal was obtained,and the frequency-domain response characteristics of the response time histories under environmental excitation were discussed.Finally,the Random Subspace Method was employed to derive the dynamic characteristics parameters of the structure.The findings of this research indicate that environmental excitation can provide continuous and stable stimulation for operational modal analysis;the first-order modal energy dissipation capability of the experimental tower is strong,with a tendency for the damping ratio values to decrease as the modal frequency increases.The experimental part of this study offers references for the monitoring and maintenance of operational transmission towers,and the conclusions derived can provide references for the wind-resistant design of transmission towers.

关 键 词：时频域分析 动力特性参数 输电塔 模态识别 运行模态分析 

分 类 号：TU391[建筑科学—结构工程]