不同激励方式下输电塔模态参数识别研究  

Research on Dynamic Characteristic Parameter Identification of Transmission Tower Under Different Excitations

作　　者：杨磊 吕宝华 王征 黄利平 YANG Lei;LYU Baohua;WANG Zheng;HUANG Liping(Northwest Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Xi'an 710064,China)

机构地区：[1]中国电力工程顾问集团西北电力设计院有限公司,陕西西安710064

出　　处：《电力勘测设计》2025年第1期30-37,共8页Electric Power Survey & Design

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：风荷载是输电塔主要控制荷载,阻尼比的取值直接影响输电塔结构风荷载的设计值,输电铁塔阻尼比取值对输电线路的抗风设计有着重要意义。输电塔设计阶段的阻尼比取值按国标GB 50009—2012中钢结构标准取0.01,为准确研究输电塔的动力参数,对两基规格相同的110 kV单塔结构与塔-线体系输电塔进行现场测试。通过4种不同激励方式对输电塔施加激励,获取不同激励方式下输电塔加速度响应信号,采用修正平均周期图法对响应信号进行降噪处理,采用半功率带宽法对响应信号进行动力参数识别。研究结果表明:环境随机激振方法可以满足输电铁塔阻尼比辨识精度的要求;微幅振动条件下,是否挂线对输电塔顺横担方向阻尼比取值影响不大,顺导线方向塔-线体系相对于单塔结构阻尼比取值约减小20%。Wind load is the main control load of transmission tower,and the value of damping ratio directly affects the design value of wind load of transmission tower,the damping ratio of transmission tower is of great significance for wind resistant design of transmission lines.According to GB 5009—2012,the standard 0.01 of steel structure is generally used for the damping ratio of transmission towers.To accurately study the dynamic parameters of the transmission tower,two 110 kV transmission towers with the same structure,transmission tower and tower-line system,are tested to get the excitation response and dynamic parameters precisely.The vibration signals are obtained by using 4 different excitation methods,modified periodogram algorithm is used to denoise the response signals,half-power bandwidth method is applied to identify the dynamic parameters of response signals.The finding indicated that the ambient excitation can meet the requirements of the identification accuracy of damping ratio.Under the condition of slight vibration,whether suspend wire or not has almost no influence on the value of the damping ratio along the cross arm direction,and the value of the damping ratio of the tower-line system along the conductor direction is 20%less than that of the single tower.

关 键 词：输电塔 塔-线体系 激振方法 加速度响应 阻尼比 

分 类 号：TM72[电气工程—电力系统及自动化]