通过基于协方差的状态指数和定量模式分析识别道岔钢轨的损坏情况

IF 2.7 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Infrastructures Pub Date : 2023-12-08 DOI:10.3390/infrastructures8120176
Jun-Fang Wang, Jian-Fu Lin, Yan-Long Xie
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引用次数: 0

摘要

道岔钢轨受到轮轨相互作用的复杂载荷,容易发生裂纹破坏。本文旨在建立在役道岔钢轨类裂纹损伤检测的状态评估方法。首先通过融合响应的时频分量来构造基于协方差的结构条件指数(CI),生成一系列由CI矩阵中列成员之间的相互关系控制的模式。然后使用贝叶斯回归和历史数据对CI中潜在的损害敏感的相互关系进行建模,并根据模型和新输入的预测建立基线模式。对新观察到的CI成员的基线模式和实际模式之间的偏差进行定量评估。为了综合考虑个体评价结果,提出了一种综合考虑概率置信度和参考模型误差的方法,通过设计一组合适的权重,将个体评价结果合并为一个综合结果。如果偏差在可容忍范围内,则不标记损坏;否则,将报告损坏的存在和严重程度。以某铁路道岔数据库的监测数据为例,建立了CI矩阵,并对该方法的损伤识别性能进行了验证。在案例分析中,不同测试场景下的实际情况与评估结果吻合较好,验证了所提方法的有效性。
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Damage Identification of Turnout Rail through a Covariance-Based Condition Index and Quantitative Pattern Analysis
Subjected to complex loadings from the wheel–rail interaction, turnout rail is prone to crack damage. This paper aims to develop a condition evaluation method for crack-alike damage detection of in-service turnout rail. A covariance-based structural condition index (CI) is firstly constructed by fusing the time-frequency components of responses, generating a series of patterns governed by the interrelationships between column members in the CI matrix. The damage-sensitive interrelationships latent in CI are then modeled using Bayesian regression and historical data, and baseline patterns are built with predictions of the models and new inputs. The deviations between the baseline patterns and the actual patterns of the newly observed CI members are quantitatively assessed. To synthetically consider the individual assessment results, a technique is developed to combine the individual assessment results into one synthetic result by designing a group of suitable weights taking into consideration both probabilistic confidence and reference model error. If the deviations are within a tolerable range, no damage is flagged; otherwise, damage existence and severity are reported. A case study is conducted, in which monitoring data from the database of a railway turnout are applied to build the CI matrix and examine the damage identification performance of this method. Good agreement between actual conditions and assessment results is found in different testing scenarios in the case study, demonstrating the effectiveness of the proposed method.
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来源期刊
Infrastructures
Infrastructures Engineering-Building and Construction
CiteScore
5.20
自引率
7.70%
发文量
145
审稿时长
11 weeks
期刊最新文献
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