环境激励下输电塔动力特性参数识别  

A study on identification of dynamic characteristic parameters of a transmission tower under ambient excitations

作　　者：赵超 赵家钰 孙清[1] 袁俊 王虎长 贺育明 谭蓉 ZHAO Chao;ZHAO Jiayu;SUN Qing;YUAN Jun;WANG Huchang;HE Yuming;TAN Rong(School of Human Settlements and Civil Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Northwest Electric Power Design Institute Co.,Ltd.,China Power Engineering Consulting Group,Xi’an 710075,China;Shannxi Electric Power Design Institute Co.,Ltd.,China Energy Engineering Group,Xi’an 710054,China)

机构地区：[1]西安交通大学人居环境与建筑工程学院,西安710049 [2]中国电力工程顾问集团西北电力设计院有限公司,西安710075 [3]中国能源建设集团陕西省电力设计院有限公司,西安710054

出　　处：《振动与冲击》2021年第4期30-35,共6页Journal of Vibration and Shock

基　　金：中国电力工程顾问集团有限公司科技项目(DG1-T02-2018);国家自然科学基金(51978570)。

摘　　要：输电塔的动力参数是进行抗风设计的重要依据,其中阻尼比的取值对输电塔风振系数的计算影响显著。以一基110 kV输电塔为背景,分别采用环境随机激振和牵引绳激振对输电塔施加激振作用,采用修正平均周期图法消除环境噪声对真实信号的干扰,在考察峰值频率相干度在95%以上的基础上,采用半功率带宽法识别输电塔的频率和阻尼比等动力参数。研究结果表明:修正平均周期图法对实测数据信号有良好的降噪效果,有效减小噪声干扰产生的阻尼比识别误差;采用环境激励能准确识别输电塔的动力参数。The dynamic parameters of a transmission tower are the important basis for wind resistance design and the value of damping ratio has significant influence on the calculation of wind vibration coefficient.A typical transmission tower with hanging line was adopted an ambient excitation method and an artificial excitation method.The modified periodogram algorithm was used to remove the interference of noise signal of the measured data.Based on the peak frequency coherence above 95%,the half-power bandwidth method was adopted to identify the frequency and damping ratio.The results show that the modified periodogram algorithm has obvious denoising effect on the measured data signals,which greatly reduces the deviation generated in the damping ratio identification process.The dynamic parameters of the transmission tower can be accurately identified by ambient excitation.

关 键 词：输电塔 阻尼比 激振方法 修正平均周期图法 

分 类 号：TU391[建筑科学—结构工程]