[1]周筱航,单德山,谭康熹,等.确定子空间识别方法在桥梁振动台模型试验中的对比[J].长安大学学报(自然科学版),2019,39(04):73-81.
　ZHOU Xiao hang,SHAN De shan,TAN Kang xi,et al.Comparison of deterministic subspace identification methods for model bridge shaking table test[J].Journal of Chang’an University (Natural Science Edition),2019,39(04):73-81.
点击复制

确定子空间识别方法在桥梁振动台模型试验中的对比()
分享到：

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第39卷
期数:
2019年04期
页码:
73-81
栏目:
道路工程
出版日期:
2019-07-15

文章信息/Info

Title:
Comparison of deterministic subspace identification methods for model bridge shaking table test
作者:
周筱航; 单德山; 谭康熹; 李乔
（西南交通大学 土木工程学院，四川 成都 610031）
Author(s):
ZHOU Xiaohang;  SHAN Deshan;  TAN Kangxi;  LI Qiao 
(School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)
关键词:
桥梁工程; 模态参数识别; 振动台试验; 确定子空间; 斜拉桥模型
Keywords:
bridge engineering;  modal parameter identification;  shaking table test;  deterministic subspace;  cablestayed bridge model
文献标志码:
A
摘要:
为了探讨确定子空间识别(DSI)方法与确定随机子空间识别(CDSI)方法在实际应用中的性能，开展了DSI方法与CDSI方法的对比研究。首先，对DSI方法与CDSI方法的算法原理进行介绍，对比了过程噪声和测试噪声在2种方法中不同的考虑方式，分析了CDSI方法在算法层面的优势。以大比尺斜拉桥模型振动台试验为依托，获取模型桥在4种不同强度等级的集集(Chichi)地震动激励下的加速度响应，为考察DSI方法与CDSI方法的算法性能提供数据支撑。然后，分别使用DSI方法与CDSI方法对模型桥的模态参数进行识别，使用稳定图对模态参数识别结果进行展示，并统计了图中稳定点个数，对比2种方法模态参数识别结果的稳定性。最后，对DSI方法与CDSI方法的振型识别结果进行展示，并统计2种方法的振型模态置信准则值(MAC)，对比了2种方法振型识别结果的差异。结果表明：DSI方法与CDSI方法识别得到的频率与阻尼比基本一致，但CDSI方法识别结果的稳定性略优；DSI方法比CDSI方法识别得到的振型幅值略大，经量纲一化处理后，2种方法识别的振型形状基本一致，但随着模态阶次的增高和激励强度的增强，两者振型的差异逐渐增大；CDSI方法考虑了数据中的过程噪声和测试噪声，其模态参数识别结果的稳定性略优于DSI方法，但同时其也降低了CDSI方法的计算效率，CDSI方法的优势并不是压倒性的。
Abstract:
In order to investigate the performance of the deterministic subspace identification (DSI) and the combined deterministicstochastic subspace identification (CDSI) in practical applications, a comparison study of DSI and CDSI were carried out. First, the algorithm principles of DSI and CDSI were introduced, the different ways of considering the process noise and measurement noise were compared, and the advantages in the algorithm of CDSI were discussed. Next, a shaking table test of a largescale cablestayed bridge model was used as a case study, the acceleration responses of the model bridge under four different degrees of Chichi seismic excitation were obtained, and data were prepared for investigating the performance of DSI and CDSI. Then, the DSI and CDSI were conducted to identify the modal parameters of the model bridge. A stabilization diagram was used to present the modal parameter identification results and the number of stabilization points was counted, the stability of the identification results of the two methods were compared. Finally, the mode shape identification results of DSI and CDSI were exhibited and the modal assurance criterions (MAC) between their mode shapes were calculated, and the differences of the mode shape identification results of the two methods were compared. The results show that the identification results of frequency and damping ratio of DSI and CDSI are consistent, however, the identification results of CDSI possess a higher stability. The amplitudes of mode shapes of DSI are slightly greater than those of CDSI, and the amplitude of the mode shapes of the two methods are approximately the same after normalization processing. However, the difference between the mode shapes of the two methods increases with the increase of the mode order and excitation degree. Process noise and measurement noise are considered in CDSI, and its modal parameter identification results are slightly better than those of DSI. However, considering noise reduces the computational efficiency of CDSI, and thus, the advantages of CDSI do not seem significant. 2 tabs, 12 figs, 25 refs.

相似文献/References:

[1]李宇,朱晞,杨庆山,等.高墩大跨桥梁结构的脆弱性分析[J].长安大学学报(自然科学版),2012,32(01):0.
[2]高亮,刘健新,张丹,等.桁架桥主梁三分力系数试验[J].长安大学学报(自然科学版),2012,32(01):0.
[3]刘旭政,王丰平,黄平明,等.斜拉桥各构件校验系数的常值范围[J].长安大学学报(自然科学版),2012,32(01):0.
[4]尚维波,张春宁.高墩刚构桥系梁抗震分析[J].长安大学学报(自然科学版),2012,32(01):0.
[5]邬晓光,李冀弘,宋伟伟.基于改进响应面法的在役PC桥梁承载力可靠性[J].长安大学学报(自然科学版),2012,32(03):53.
　WU Xiao-guang,LI Ji-hong,SONG Wei-wei.Reliability of existing PC bridge based on improved response surface method[J].Journal of Chang’an University (Natural Science Edition),2012,32(04):53.
[6]石雄伟,袁卓亚,马毓泉,等.钢板-混凝土组合加固预应力混凝土箱梁[J].长安大学学报(自然科学版),2012,32(03):58.
　SHI Xiong-wei,YUAN Zhuo-ya,MA Yu-quan,et al.Prestressed concrete box girder strengthened with comsposition of steel plate and concrete[J].Journal of Chang’an University (Natural Science Edition),2012,32(04):58.
[7]李传习,陶 伟,董创文.斜交墩截面刚度与弯曲正应力[J].长安大学学报(自然科学版),2012,32(03):63.
　LI Chuan-xi,TAO Wei,DONG Chuang-wen.Sectional stiffness and bending normal stress of oblique pier[J].Journal of Chang’an University (Natural Science Edition),2012,32(04):63.
[8]邓继华,邵旭东.带铰平面梁元几何非线性有限元分析[J].长安大学学报(自然科学版),2012,32(03):68.
　DENG Ji-hua,SHAO Xu-dong.Geometric nonlinear finite element analysis of plane beam element with hinge[J].Journal of Chang’an University (Natural Science Edition),2012,32(04):68.
[9]蒲广宁,赵 煜,宋一凡.减梁增肋法加固空心板桥的力学性能[J].长安大学学报(自然科学版),2012,32(06):38.
　PU Guang-ning,ZHAO Yu,SONG Yi-fan.Mechanical properties of strengthening hollow slab bridge based on beam-reduction and rib-addition method[J].Journal of Chang’an University (Natural Science Edition),2012,32(04):38.
[10]党 栋,贺拴海,周勇军,等.基于车辆统计数据的汽车荷载标准值取值与评估[J].长安大学学报(自然科学版),2012,32(06):44.
　DANG Dong,HE Shuan-hai,ZHOU Yong-jun,et al.Choosing and assessment for the standard of vehicle load based on vehicle statistical data[J].Journal of Chang’an University (Natural Science Edition),2012,32(04):44.

更新日期/Last Update: 2019-07-29