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铁路轨道几何不平顺变化特征及其预测模型研究
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摘要
轨道几何平顺状态是轨道结构部件综合性能的表现,直接反映了轨道质量状态的优劣。研究随列车重复载荷作用下的轨道几何不平顺变化特征,并构建科学合理的预测模型实现对轨道线路病害的预测及维修计划的编制,对于指导工务科学管理、保障行车安全具有重要意义。
     在分析国内外轨道几何不平顺变化研究及预测理论的基础上,本文以轨道几何不平顺变化特征及构建轨道不平顺预测模型为重点进行了研究。首先,综述了轨道几何不平顺项目及数据来源,并针对轨检车检测数据存在的质量问题,提出了相应的解决方法;其次,利用积累的实际检测数据,分析了轨道几何不平顺变化的波形特征、周期性特征以及发展恶化速率特征,并得出了相关结论;第三,基于轨道几何不平顺变化特征,借鉴综合因子法的预测思路,构建了轨道局部不平顺综合因子预测模型,并利用实际数据验证了模型的预测精度;最后,提出了基于预测的建议维修计划编制策略及编制依据,给出了建议维修计划的编制实例,并利用计算机实现了模型的预测和应用。
     轨道几何不平顺的变化特征揭示了轨道状态变化的一般规律,本文应用大量的轨道检测数据进行了分析总结,以此为理论基础提出的轨道局部不平顺综合因子预测模型经实例验证具有较好的精度,并且在计算机编制建议维修计划方面做了初步的尝试。这对于下一步进行轨道养护管理辅助决策的研究必将产生积极的推动作用。
Rail track geometric irregularities are the concrete embodiment of track structure deterioration, and give an expression to the comprehensive performance of track members. Therefore, study on variation characteristics of track geometric irregularity caused by repetitive trainloads, and develop feasible prediction models to predict track deterioration in future so as to decide preventive maintenance plans, are of great significance to assisting governor decision-making and safeguarding the transportation.
     Based on existing theories of track geometry irregularity deterioration and prediction, this paper laid an emphasis on the study of variation characteristics and tried to establish a feasible prediction model. First, this paper introduced items of track geometry irregularities, and proposed computer techniques for track inspection data correction. Second, with plentiful track inspection data, variation characteristics of track irregularity waveform, periodic deterioration, and track irregularity deterioration rate were analyzed, and valuable conclusions were given correspondingly. Then, using these conclusions as reference, and inspired by the thought of integrating factor method for prediction, we developed an improved track geometric irregularity integrating factor prediction model, and applied this model to estimated track irregularity growth in Beijing-Shanghai railway, evaluation results verified high accuracy of this model. Finally, this paper put forward the strategies and relative theories for suggested maintenance planning, and showed the monthly suggested plans for April,2009 in Beijing-Shanghai railway as example. In addition, a practical software was programmed so as to provide useful tools for prediction and decision-making.
     Variation characteristics of track geometric irregularity reveal the general regularity of track deterioration. This paper has made a comprehensive analysis and developed a new track geometric irregularity prediction model, which has been verified with high accuracy. Furthermore, the software programmed in this paper offers the first step into computer aided track maintenance planning. All of these studies will certainly play positive and promotive roles in guiding rail track maintenance and assisting governor decision-making.
引文
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