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

Comprehensive Evaluation Model of High Speed Railway Track Irregularity Based on Analytic Hierarchy Process and Sigmoid Function

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。

In order to evaluate the track irregularity with various data, combining with Analytic Hierarchy Processand Sigmoid Function, a comprehensive evaluation model of high speed railw ay track irregularity was presented. Thef irst 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 inf luenceof wave length on dynamic performance of the track- vehicle system. The weights of different indexes weredetermined by the pairw ise comparison matrix, and they were normalized by the Sigmoid function, so that thecomprehensive evaluation index was limited in[0, 100]. C ompared with the existing model,this new modelintroduced short w ave irregularity and could comprehensively ref lect the track irregularity state of high speedrailway . The new model has the advantages that its physical meaning is clear and it is easy to apply . The model wasused on certain railway . The results show that it is feasible and effective.