软基水闸底板脱空反演中的传感器优化布置方法
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作者单位:

(南昌大学工程建设学院,江西 南昌 330031 )

作者简介:

李火坤(1981—),男,教授,博士,主要从事水工水力学与工程安全检测研究。E-mail: lihuokun@ncu.edu.cn

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中图分类号:

TV662

基金项目:

国家自然科学基金(52079061,51879126,51909115);江西省自然科学基金(20192BAB216038);江西省水利厅科技项目 (202123YBKT04);江西省研究生创新专项(YC2021-S052)


Optimal sensor arrangement method of sluice floor voiding inversion on soft foundation
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(School of Infrastructure Engineering, Nanchang University, Nanchang 330031, China)

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    摘要:

    为更好地使软基水闸底板脱空检测传感器系统达到监测成本和监测性能指标之间的最佳平衡,同时为解决传统的有效独立法和损伤灵敏度法不能兼顾模态线性独立和损伤敏感性的问题,提出了一种结合有效独立法和损伤灵敏度法的多目标传感器优化布置方法。为解决模态数据冗余问题引入节点相似度函数,从动力学上探究水闸底板脱空对模态参数的影响,认为模态柔度为软基水闸底板脱空敏感特征量。以Fisher信息矩阵2-范数最大为目标,采用MAC矩阵非对角元最大值为评价指标,实现测点优化布置,并将测点优化结果应用于水闸底板脱空反演。结果表明:传感器优化布置后的水闸底板脱空参数识别值相对误差的平均值分别从283%、158%、393%降低至1%、19%、159%,验证了该方法的可靠性。

    Abstract:

    To better make the sensor system of sluice floor voiding monitoring on soft foundation to achieve the best balance between costs and performance index, at the same time to solve the problem of traditional effective independence method and damage sensitivity method that cannot consider both modal linear independence and damage sensitivity, a multi-objective approach combined with effective independence method and damage sensitivity method is proposed to optimize the sensor arrangement.To solve the problem of modal data redundancy, the node similarity function is introduced. The influence of the sluice floor voiding on the modal parameters is explored from the aspect of hydrodynamics, and the modal flexibility is determined as the voiding sensitive characteristic quantity. Taking the maximum 2-norm of the Fisher information matrix as the goal, the maximum off-diagonal element of the MAC matrix is used as the evaluation index. The optimal arrangement of measuring points is then realized, and the results of the measuring points have been applied to the voiding inversion of the sluice floor. The results show that the meanrelative error of the recognition accuracy after the sensor optimization is decreased from 28.3%, 15.8%, 39.3% to 1%, 1.9%, 15.9%, respectively, indicating that the reliability of the method is verified. Keywords: sluice on soft foundation; floor voiding; optimal sensor arrangement; effective independence method; damage sensitivity method; modal flexibility 〖FL

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李火坤,方静,黄伟,等.软基水闸底板脱空反演中的传感器优化布置方法[J].水利水电科技进展,2022,42(5):45-51.(LI Huokun, FANG Jing, HANG Wei, et al. Optimal sensor arrangement method of sluice floor voiding inversion on soft foundation[J]. Advances in Science and Technology of Water Resources,2022,42(5):45-51.(in Chinese))

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  • 收稿日期:2021-10-30
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  • 在线发布日期: 2022-09-08
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