摘要
为避免接触式测量传感器附加质量的影响,采用非接触式声压测量获取结构近场的辐射声压信号,提出Hilbert-Huang变换二次滤波时频分析方法对非平稳的近场声压辐射信号进行分析,实现了在强噪声环境中对桥梁结构模态参数的识别。在实验室对一跨径为11.2 m的H型简支钢梁开展试验,结果表明:该方法能准确识别钢梁的前3阶固有频率,平均误差在0.5%以内,并成功获取结构的模态振型。该方法为桥梁结构模态参数获取和结构健康监测提供新的手段。
In order to overcome the influence of the additional mass of the contact measurement sensor,the non-contact sound pressure measurement was used to obtain the radiated sound pressure signal of the structure in the near field,and the Hilbert-Huang transform secondary filtering analysis method was proposed.This method can effectively process the non-stationary sound pressure signal,identify the modal parameters of the structure from the noise environment and realize the identification of bridge modal parameters by using sound pressure signal.In the laboratory,the dynamic test of an H-shaped beam with a span of 11.2 m was carried out.The result shows that this method can quickly and accurately obtain the first three natural frequencies of the beam,and the average error is less than 0.5%.On the basis of obtaining the natural frequencies of the structure,the modal shape of the structure is successfully identified.This method provides provide new ideas and methods for bridge structural dynamic parameter testing and structural health monitoring.
作者
郑佳艳
刘年
周志祥
余忠儒
唐俊义
邓国军
ZHENG Jia-yan;LIU Nian;ZHOU Zhi-xiang;YU Zhong-ru;TANG Jun-yi;DENG Guo-jun(School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China;College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518061, China)
出处
《科学技术与工程》
北大核心
2021年第30期13116-13122,共7页
Science Technology and Engineering
基金
国家自然科学基金(51778094)
重庆市交通大学研究生科研创新项目(2021S0019)。
关键词
非接触测量
辐射声压信号
希尔伯特黄变换
二次滤波
模态参数
non-contact measurement
sound pressure signal
Hilbert-Huang transform
quadratic filtering
dynamic parameters
作者简介
第一作者:郑佳艳(1976—)女,汉族,四川遂宁人,硕士,副教授,研究方向:桥梁健康监测,E-mail:jiayanzheng@cqjtu.edu.cn;通信作者:周志祥(1958—),男,汉族,四川遂宁人,博士,教授,研究方向:桥梁健康监测,E-mail:j.y.tang@mails.cqjtu.edu.cn。
