摘要
结合自然激励技术和2种时域模态参数识别方法,形成结构工作模态参数识别的NExT-ITD法和NExT-ERA法。采用这2种方法分别对一个3层框架结构模型和1座三跨混凝土连续梁桥进行了振动试验模态参数识别,讨论了这2种方法应用中的系统定阶和虚假模态剔除问题并将识别结果与频域法识别结果相对比。结果表明,这2种方法在非白噪声激励下进行结构模态参数识别的有效性。
The modal parameters of a model of three DOF frame and a three-span continuous bridge were calculated by using NExT-ERA and NExT-ITD respectively.Issues of determining system order number and extracting accurate mode were discussed.The results were compared with which identified by peak pick method in frequency domain.The experiment and engineering application show that NExT-ERA and NExT-ITD are all effective methods of structural modal parameter identification.
出处
《建材世界》
2010年第3期79-82,共4页
The World of Building Materials
关键词
模态参数识别
自然激励技术
信号处理
modal parameter identification
natural excitation technique
signal processing
