矢距差方法表征轨道平顺性状态的适用性分析

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摘要 研究目的：在高速铁路建造技术引进的过程中,为表征轨道的高低、轨向的平顺性,我国引入了矢距差方法。然而矢距差方法在轨道状态评价及维修作业指导中的效果存在一定的争议,其在轨道管理中的适用性亟需明确。为厘清这一现象背后的机制,本文首先从矢距差与车体加速度的相关性问题切入,采用相关系数与归一化互信息评价矢距差对车辆动力学响应的反映能力;然后从矢距差的轨道偏差状态空间描述的角度,通过建立矢距差下的轨道偏差状态空间表达式并分析其能观性,讨论矢距差对轨道偏差状态的表征能力,明确其指导作业性能;最后比较了中点矢距对轨道平顺性状态的表征性能。
研究结论：(1)5 m/30 m及150 m/ 300 m矢距差与车体加速度间呈弱相关关系,且无证据显示二者间存在非线性映射结构;(2)由于5 m/30 m或150 m/ 300 m矢距差所表征的状态空间不完全能观,故难以通过矢距差指导轨道维修作业;(3)中点矢距所表征的轨道系统不能观状态数较少,补充少量测量条件即可实现轨道偏差状态的完全能控能观,同时与车体加速度呈强相关关系,一定程度上更有利于轨道评价及维修作业;（4）本文研究解释了矢距差方法在高速铁路轨道评价与轨道维修中存在的适用性问题,可为合理选择轨道不平顺表征方法提供一定的理论依据。

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	魏晖
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	曹娟华

关键词 ：高速铁路, 轨道不平顺, 矢距差, 相关性, 状态空间描述

Abstract：Research purposes: In the process of importing High-speed railway ( HSR ) construction technology, the difference of chord offsets (DoCOs) method was introduced in China Railway for representing profile/alignment irregularities. Nevertheless, there are some controversies about DoCOs’ effects on track state evaluation and maintenance operation instruction, so DoCOs’ serviceability in track maintenance should be ascertained. To address the underlying mechanism of this issue, this paper starts with the correlation between DoCOs and car body acceleration and evaluates DoCOs’ reflection capability about vehicle dynamic response using correlation coefficient and normalized mutual information. Then in view of DoCOs’ state space description, discusses track deformation representing capability of DoCOs and addresses the instruction capability for maintenance operation, which employed track deformation state-space representation and observability analysis. On this basis, compares track irregularities representing the capability of mid-chord offset (MCO) and difference of chord offsets.
Research conclusions: (1) There is a weak correlation between 5 m/30 m or 150 m/300 m DoCOs and car body accelerations, and no evidence indicates that a nonlinear mapping structure exists. (2) Since the state space of 5 m/ 30 m or150 m/ 300 m DoCOs is not complete observable, it is difficult to instruct the maintenance from DoCOs. (3) MCO’s unobservable states are quite a few compared with DoCOs’ in the track deformation state-space representing, and it could be complete observable taking some supplementary observations, moreover, MCOs are strongly correlated with car body accelerations, all these characteristics are more propitious to evaluate the track states and instruct the maintenance operation. (4) These conclusions illuminate the serviceability problem of DoCOs existing in HSR track evaluation and maintenance and could present a theoretical foundation for selecting representation indices for track irregularities.

Key words： high-speed railway track irregularities difference of chord offset correlation state space description

收稿日期: 2023-06-20

PACS:

U216.3

基金资助:国家重点研发计划(2022YFB2602905); 江西省自然科学基金(20202BABL204056); 江西省科学技术厅重大科技研发专项 (20203ABC28W008); 国家自然科学基金(52278465,52068052)

作者简介: ** 魏晖,1975年出生, 男,教授,硕士生导师。

引用本文:

魏晖, 杨飞, 朱洪涛, 谢智峰, 曹娟华. 矢距差方法表征轨道平顺性状态的适用性分析[J]. 铁道工程学报, 2024, 41(11): 30-35.
WEI Hui, YANG Fei, ZHU Hongtao, XIE Zhifeng, CAO Juanhua. Difference of Chord Offsets Method's Serviceability Analysis for Track Irregularities Representation. Journal of Railway Engineering Society, 2024, 41(11): 30-35.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2024/V41/I11/30

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