中国铁道科学2025，Vol.46Issue(2)：93-103,11.DOI:10.3969/j.issn.1001-4632.2025.02.09
普速铁路简支梁桥影响线识别的3段式滤波方法
A Three-Stage Filtering Method for Identifying the Influence Lines of Simply-Supported Beam Bridges for Conventional-Speed Railway
摘要
Abstract
Bridge influence lines represent the static characteristics of bridges and are widely used in vehicle axle load identification and bridge damage assessment.To enhance the accuracy of influence line identification for conventional-speed railway simply-supported beam bridges,this paper proposes a three-stage filtering method for bridge response.Firstly,the bridge response was divided into three stages based on the physical process of the train crossing the bridge.The time-frequency domain characteristics of responses for each stage were analyzed using Morlet continuous wavelet transform.Secondly,given divergent time-frequency characteristics among stages,a three-stage composite filtering method was introduced:low-pass filtering for the entry and exit stages,and median filtering for the passage stage.The optimal filtering parameters for low-pass and median filtering were determined using the time-frequency characteristics of the response and genetic algorithm,respectively.Finally,to ensure the continuity and sequential of the signal,the median and low-pass filtering were applied near the signal segment points,to achieve smooth transition.Through numerical cases validation,the results demonstrated that the three-stage filtering method provided better filtering performance and higher identification accuracy for the influence line compared to traditional low-pass filtering method for identifying influence lines of simply-supported beam bridges for conventional-speed railway.Furthermore,under varying train speeds and track irregularities,the standard root-mean-square error and peak error were less than 5%and 6%respectively,verifying strong adaptability and robustness of the proposed method.关键词
普速铁路/简支梁桥/3段式滤波/影响线识别/连续小波变换/时频域特性Key words
Conventional-speed railway/Simply-supported beam bridges/Three-stage filtering/Influence line identification/Continuous wavelet transform/Time-frequency domain characteristics分类
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王志航,战家旺,马慧君,苏永华,张勇,王闯..普速铁路简支梁桥影响线识别的3段式滤波方法[J].中国铁道科学,2025,46(2):93-103,11.基金项目
国家自然科学基金资助项目(52178100) （52178100）
