渡槽排架结构环境激励模态试验
|
摘要
为获得渡槽排架结构动力特性,开展渡槽排架单向单输入多输出(SIMO)法、双向多输入多输出(MIMO)法环境激励模态试验,选用增强频域分解法识别纵向、横向、双向模态参数。结果表明,SIMO法纵向模态绝大多数谱峰明显、识别效果较好,纵向模态比横向模态丰富;MIMO法纵向或以纵向为主的谱峰大多数明显,横向或以横向为主、双向模态除双向第2阶(即横向第1阶)谱峰明显外,其他较小,甚至未能识别;排架柱以弯曲振动为主,纵向低阶、高阶模态横梁分别以平动或转动刚体振动、弯曲振动为主,横向模态横梁为平动或不动刚体振动;两种方法识别出的模态频率误差较小,SIMO法结果更为可靠,尤其是低阶模态。从低阶识别精度、试验工作量及操作便捷性而言,排架结构环境激励模态试验选择单向SIMO法优于双向MIMO法。
Ambient excitation modal tests of one-way SIMO(single input multiple output) method and two-way MIMO(multiple input multiple output) method were carried out to obtain the dynamic characteristics of aqueduct bent structures. Longitudinal, transverse and bidirectional modal parameters were identified by enhanced frequency domain decomposition. The results show that most spectrum peaks of longitudinal modes are obvious with better identification results, and the longitudinal modes are more abundant than transverse ones by SIMO method. Most spectrum peaks of longitudinal or mainly longitudinal modes are also obvious by MIMO method. However, spectrum peaks of transverse modes or mainly transverse modes, bidirectional modes are small and some are difficult to be identified except for the second bidirectional order mode, i.e. the first transverse order mode. The column is identified with bending vibration. The beam is identified with rigid body vibration of translation or rotation for longitudinal low-order modal shapes, while it is characterized with bending vibration for high-order modes. For transverse modal shapes, the beam is identified with rigid body vibration of translation or immovability. The error of modal frequency identified by SIMO and MIMO methods is small. The results by SIMO method are more reliable, especially for low-order modes. Therefore, in the aspects of low-order modes identification accuracy, test workload and operation convenience, one-way SIMO method is better than two-way MIMO method for bent structure modal test.
Ambient excitation modal tests of one-way SIMO(single input multiple output) method and two-way MIMO(multiple input multiple output) method were carried out to obtain the dynamic characteristics of aqueduct bent structures. Longitudinal, transverse and bidirectional modal parameters were identified by enhanced frequency domain decomposition. The results show that most spectrum peaks of longitudinal modes are obvious with better identification results, and the longitudinal modes are more abundant than transverse ones by SIMO method. Most spectrum peaks of longitudinal or mainly longitudinal modes are also obvious by MIMO method. However, spectrum peaks of transverse modes or mainly transverse modes, bidirectional modes are small and some are difficult to be identified except for the second bidirectional order mode, i.e. the first transverse order mode. The column is identified with bending vibration. The beam is identified with rigid body vibration of translation or rotation for longitudinal low-order modal shapes, while it is characterized with bending vibration for high-order modes. For transverse modal shapes, the beam is identified with rigid body vibration of translation or immovability. The error of modal frequency identified by SIMO and MIMO methods is small. The results by SIMO method are more reliable, especially for low-order modes. Therefore, in the aspects of low-order modes identification accuracy, test workload and operation convenience, one-way SIMO method is better than two-way MIMO method for bent structure modal test.
引文
[1]顾培英,黄勤红,邓昌,等.基于重整化群的水工混凝土结构整体破坏概率研究[J].水利水运工程学报,2010(4):1-5.(GU Peiying,HUANG Qinhong,DENG Chang,et al.Damage probability of hydraulic concrete structure based on renormalization group theory[J].Hydro-science and Engineering,2010(4):1-5.(in Chinese))
[2]GU Peiying,DENG Chang,ZHANG Daosheng,et al.Probability of overall collapse for concrete gravity dam based on renormalization group theory of unequal probability unit[C]//The 2nd SREE Conference on Hydraulic Engineering(CHE 2013).London:CRCPress,2014:135-140.
[3]顾培英,邓昌,汤雷.基于重整化群方法的三棱柱单元整体破坏概率模型[J].水利水电科技进展,2014,34(3):16-19.(GU Peiying,DENG Chang,TANG Lei.Amodel of overall damage probability of triangular prism unit based on renormalization group method[J].Advances in Science and Technology of Water Resources,2014,34(3):16-19.(in Chinese))
[4]顾培英,邓昌,汤雷.基于重整化群有限原胞级整体安全性分级评价[J].河海大学学报(自然科学版),2014,42(4):355-360.(GU Peiying,DENG Chang,TANG Lei.Safety classification evaluation of an overall structure based on limited primitive cell level using renormalization group theory[J].Journal of Hohai University(Natural Sciences),2014,42(4):355-360.(in Chinese))
[5]顾培英,邓昌,肖仕燕,等.基于二维逾渗相变重整化群的混凝土重力坝断面破坏评价[J].水利水电科技进展,2015,35(6):31-36.(GU Peiying,DENG Chang,XIAO Shiyan,et al.Development of cross-section damage based on two-dimensional percolation transition with renormalization group theory for concrete gravity dam[J].Advances in Science and Technology of Water Resources,2015,35(6):31-36.(in Chinese))
[6]顾培英,王岚岚,邓昌,等.我国渡槽结构典型破坏特征研究综述[J].水利水电科技进展,2017,37(5):1-8.(GU Peiying,WANG Lanlan,DENG Chang,et al.Review of typical failure characteristics of aqueduct structures in China[J].Advances in Science and Technology of Water Resources,2017,37(5):1-8.(in Chinese))
[7]顾培英,邓昌,王岚岚,等.渡槽排架结构人工激励模态试验分析[J].振动与冲击,2019,38(7):146-154.(GU Peiying,DENG Chang,WANG Lanlan,et al.Modal test analysis of an aqueduct bent structure under artificial excitation[J].Journal of Vibration and Shock,2019,38(7):146-154.(in Chinese))
[8]杭晓晨,蒋令闻,顾明华,等.频域分解模态识别方法的阻尼识别精度研究[J].振动工程学报,2015,28(4):518-524.(HANG Xiaochen,JIANG Lingwen,GUMinghua,et al.Accuracy of modal damping identification using frequency domain decomposition method[J].Journal of Vibration Engineering,2015,28(4):518-524.(in Chinese))
[9]叶锡钧,颜全胜,王卫锋,等.基于多参考点稳定图的斜拉桥模态参数识别[J].华南理工大学学报(自然科学版),2011,39(9):41-47.(YE Xijun,YANQuansheng,WANG Weifeng,et al.Modal parameter identification of cable-stayed bridge based on multiple reference DOFs stabilization diagram[J].Journal of South China University of Technology(Natural Science Edition),2011,39(9):41-47.(in Chinese))
[10]王彤,张令弥.运行模态分析的频域空间域分解法及其应用[J].航空学报,2006,27(1):62-66.(WANGTong,ZHANG Lingmi.Frequency and spatial domain decomposition for operational modal analysis and its application[J].Acta Aeronautica et Astronautica Sinica,2006,27(1):62-66.(in Chinese))
[11]孙正华,李兆霞,陈鸿天,等.大跨斜拉桥基于结构模拟的环境振动测点优化布置[J].应用科学学报,2007,25(4):411-417.(SUN Zhenghua,LI Zhaoxia,CHENHongtian,et al.Optimal configuration of ambient vibration sensors based on structural modeling for long cable-stayed bridge[J].Journal of Applied Sciences,2007,25(4):411-417.(in Chinese))
[12]CARNE T G,DOHMANN C R.A modal test design strategy for model correlation[C]//Proceedings of the13th International Modal Analysis Conference.New York:Union College,Schenectady,1995:927-933.
[13]柯国军,郭长青,胡绍全,等.混凝土阻尼比研究[J].建筑材料学报,2004,7(1):35-40.(KE Guojun,GUOChangqing,HU Shaoquan,et al.Study on the damping ratio of concrete[J].Journal of Building Materials,2004,7(1):35-40.(in Chinese))
[2]GU Peiying,DENG Chang,ZHANG Daosheng,et al.Probability of overall collapse for concrete gravity dam based on renormalization group theory of unequal probability unit[C]//The 2nd SREE Conference on Hydraulic Engineering(CHE 2013).London:CRCPress,2014:135-140.
[3]顾培英,邓昌,汤雷.基于重整化群方法的三棱柱单元整体破坏概率模型[J].水利水电科技进展,2014,34(3):16-19.(GU Peiying,DENG Chang,TANG Lei.Amodel of overall damage probability of triangular prism unit based on renormalization group method[J].Advances in Science and Technology of Water Resources,2014,34(3):16-19.(in Chinese))
[4]顾培英,邓昌,汤雷.基于重整化群有限原胞级整体安全性分级评价[J].河海大学学报(自然科学版),2014,42(4):355-360.(GU Peiying,DENG Chang,TANG Lei.Safety classification evaluation of an overall structure based on limited primitive cell level using renormalization group theory[J].Journal of Hohai University(Natural Sciences),2014,42(4):355-360.(in Chinese))
[5]顾培英,邓昌,肖仕燕,等.基于二维逾渗相变重整化群的混凝土重力坝断面破坏评价[J].水利水电科技进展,2015,35(6):31-36.(GU Peiying,DENG Chang,XIAO Shiyan,et al.Development of cross-section damage based on two-dimensional percolation transition with renormalization group theory for concrete gravity dam[J].Advances in Science and Technology of Water Resources,2015,35(6):31-36.(in Chinese))
[6]顾培英,王岚岚,邓昌,等.我国渡槽结构典型破坏特征研究综述[J].水利水电科技进展,2017,37(5):1-8.(GU Peiying,WANG Lanlan,DENG Chang,et al.Review of typical failure characteristics of aqueduct structures in China[J].Advances in Science and Technology of Water Resources,2017,37(5):1-8.(in Chinese))
[7]顾培英,邓昌,王岚岚,等.渡槽排架结构人工激励模态试验分析[J].振动与冲击,2019,38(7):146-154.(GU Peiying,DENG Chang,WANG Lanlan,et al.Modal test analysis of an aqueduct bent structure under artificial excitation[J].Journal of Vibration and Shock,2019,38(7):146-154.(in Chinese))
[8]杭晓晨,蒋令闻,顾明华,等.频域分解模态识别方法的阻尼识别精度研究[J].振动工程学报,2015,28(4):518-524.(HANG Xiaochen,JIANG Lingwen,GUMinghua,et al.Accuracy of modal damping identification using frequency domain decomposition method[J].Journal of Vibration Engineering,2015,28(4):518-524.(in Chinese))
[9]叶锡钧,颜全胜,王卫锋,等.基于多参考点稳定图的斜拉桥模态参数识别[J].华南理工大学学报(自然科学版),2011,39(9):41-47.(YE Xijun,YANQuansheng,WANG Weifeng,et al.Modal parameter identification of cable-stayed bridge based on multiple reference DOFs stabilization diagram[J].Journal of South China University of Technology(Natural Science Edition),2011,39(9):41-47.(in Chinese))
[10]王彤,张令弥.运行模态分析的频域空间域分解法及其应用[J].航空学报,2006,27(1):62-66.(WANGTong,ZHANG Lingmi.Frequency and spatial domain decomposition for operational modal analysis and its application[J].Acta Aeronautica et Astronautica Sinica,2006,27(1):62-66.(in Chinese))
[11]孙正华,李兆霞,陈鸿天,等.大跨斜拉桥基于结构模拟的环境振动测点优化布置[J].应用科学学报,2007,25(4):411-417.(SUN Zhenghua,LI Zhaoxia,CHENHongtian,et al.Optimal configuration of ambient vibration sensors based on structural modeling for long cable-stayed bridge[J].Journal of Applied Sciences,2007,25(4):411-417.(in Chinese))
[12]CARNE T G,DOHMANN C R.A modal test design strategy for model correlation[C]//Proceedings of the13th International Modal Analysis Conference.New York:Union College,Schenectady,1995:927-933.
[13]柯国军,郭长青,胡绍全,等.混凝土阻尼比研究[J].建筑材料学报,2004,7(1):35-40.(KE Guojun,GUOChangqing,HU Shaoquan,et al.Study on the damping ratio of concrete[J].Journal of Building Materials,2004,7(1):35-40.(in Chinese))
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |