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基于自回归条件异方差转换指标的非线性损伤识别

郭惠勇 王志华 李正良

郭惠勇, 王志华, 李正良. 基于自回归条件异方差转换指标的非线性损伤识别[J]. 西南交通大学学报, 2020, 55(3): 459-466, 517. doi: 10.3969/j.issn.0258-2724.20180316
引用本文: 郭惠勇, 王志华, 李正良. 基于自回归条件异方差转换指标的非线性损伤识别[J]. 西南交通大学学报, 2020, 55(3): 459-466, 517. doi: 10.3969/j.issn.0258-2724.20180316
GUO Huiyong, WANG Zhihua, LI Zhengliang. Structural Nonlinear Damage Identification Based on Autoregressive Conditional Heteroskedasticity Conversion Index[J]. Journal of Southwest Jiaotong University, 2020, 55(3): 459-466, 517. doi: 10.3969/j.issn.0258-2724.20180316
Citation: GUO Huiyong, WANG Zhihua, LI Zhengliang. Structural Nonlinear Damage Identification Based on Autoregressive Conditional Heteroskedasticity Conversion Index[J]. Journal of Southwest Jiaotong University, 2020, 55(3): 459-466, 517. doi: 10.3969/j.issn.0258-2724.20180316

基于自回归条件异方差转换指标的非线性损伤识别

doi: 10.3969/j.issn.0258-2724.20180316
基金项目: 国家自然科学基金资助项目(51578094,51468058)
详细信息
    作者简介:

    郭惠勇(1971—),男,教授,研究方向为结构损伤识别,E-mail:guohy@cqu.edu.cn

  • 中图分类号: TB123

Structural Nonlinear Damage Identification Based on Autoregressive Conditional Heteroskedasticity Conversion Index

  • 摘要: 为了解决时域非线性损伤的识别问题,基于自回归条件异方差(ARCH)模型的基本理论给出了ARCH模型建模的定阶方法及模型参数估计的极大似然估计法;分析了结构非线性损伤的特性,提出了基于ARCH模型的非线性损伤识别原理;考虑到基于自由度的损伤指标难于判断损伤位置,故提出了一种自回归条件异方差转换指标;在测量误差和模型误差的影响下,使用3层框架结构的非线性损伤试验来验证该损伤指标的有效性. 试验结果表明:非线性间隙距离为0.05 mm和0.10 mm时,损伤位置第3层的自回归条件异方差转换指标值比传统的倒谱测距转化指标值高21.7%以上;当非线性间隙距离为0.20 mm时,第3层的自回归条件异方差转换指标值比倒谱测距转化指标值高3.7%.

     

  • 图 1  3层框架结构

    Figure 1.  Three-story frame structure

    图 2  基准状态下的加速度响应曲线

    Figure 2.  Acceleration response time histories in basic state

    图 3  工况2的加速度响应曲线

    Figure 3.  Acceleration response time histories in state 2

    图 4  基准状态下通道3~5的AIC-q的曲线关系

    Figure 4.  Relationships of AIC-q of Channel 3~5 in basic State

    图 5  工况2下通道3~5的AIC-q的曲线关系

    Figure 5.  Relationships of AIC-q of Channel 3~5 in state 2

    图 6  指标ARCHCI和PCMCI在不同工况下的损伤识别结果

    Figure 6.  Damage identification results of ARCHCI and PCMCI in different states

    表  1  传感器通道的参数设置

    Table  1.   Parameter of sensor channels

    通道名称传感器型号灵敏度
    通道 1 测力传感器 PCB 208 C03 SN 22569 2.2 mV/N
    通道 2 加速度计 PCB 336C SN 10099 1 000 mV/g
    通道 3 加速度计 PCB 336C SN 10120 1 000 mV/g
    通道 4 加速度计 PCB 336C SN 9916 1 000 mV/g
    通道 5 加速度计 PCB 336C SN 10100 1 000 mV/g
    下载: 导出CSV

    表  2  三层框架结构的非线性损伤工况

    Table  2.   Damaged state of the three-story frame structure

    损伤工况具体描述
    工况 1 间隙 0.05 mm
    工况 2 间隙 0.10 mm
    工况 3 间隙 0.20 mm(弱非线性)
    工况 4 间隙 0.10 mm +第 1 层附加质量 1.2 kg
    工况 5 间隙 0.20 mm+第 1 层附加
    质量 1.2 kg(弱非线性)
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-05-22
  • 修回日期:  2018-08-31
  • 网络出版日期:  2018-09-05
  • 刊出日期:  2020-06-01

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