基于层次分析法和Sigmoid函数的高速铁路轨道平顺性综合评价模型

摘要

In order to evaluate the track irregularity with various data,combining with Analytic Hierarchy Process and Sigmoid Function,a comprehensive evaluation model of high speed railway track irregularity was presented.The first level of the model was consisted with short wave,medium wave and long wave irregularity.In the second layer,according to the characteristics of wave length,different characteristic indexes were selected to describe the influence of wave length on dynamic performance of the track-vehicle system.The weights of different indexes were determined by the pairwise comparison matrix,and they were normalized by the Sigmoid function,so that the comprehensive evaluation index was limited in[0,100].Compared with the existing model,this new model introduced short wave irregularity and could comprehensively reflect the track irregularity state of high speed railway.The new model has the advantages that its physical meaning is clear and it is easy to apply.The model was used on certain railway.The results show that it is feasible and effective.%为了有效利用多种检测数据评判轨道的状态,结合层次分析法和Sigmoid 函数,提出高速铁路轨道平顺性综合评价模型.模型第1层由轨道短波、中波和长波不平顺构成;在第2层中,针对波长的特性采用不同的特征指标反映其对轨道-车辆系统动力学性能的影响.特征指标的权重由成对比较矩阵的特征向量确定,同时引入Sigmoid 函数对特征指标进行归一化,保证了综合评价指标分布在[0,100].与已有综合模型相比,新模型引入了短波不平顺,能更全面地反映高速铁路轨道不平顺的状态,同时具有物理意义清晰和易于实现的优点.利用新的评判方法对某线路的轨道状态进行评判,结果表明该方法是可行、有效的.