Global Sensitivity Analysis for Vehicle–Track Interactions: Special Attention on Track Irregularities

Author:

Xu Lei12,Zhai Wanming3,Gao Jianmin4

Affiliation:

1. Train and Track Research Institute, Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China;

2. Section of Railway Engineering, Delft University of Technology, Delft 2628LV, The Netherlands

3. Train and Track Research Institute, Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China e-mail:

4. Train and Track Research Institute, Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China

Abstract

The dynamic vehicle–track interactions are complex processes due to the highly nonlinear terms and spatially varying excitations in vehicle design, track maintenance, dynamic prediction, etc. Therefore, it is of importance to clarify the key factors affecting the dynamic behaviors of system components. In this paper, a comprehensive model is presented, which is capable of analyzing the global sensitivity of vehicle–track interactions. In this model, the vehicle–track interactions considering the nonlinear wheel–rail contact geometries are depicted in three-dimensional (3D) space, and then the approaches for global sensitivity analysis (GSA) and time–frequency analysis are combined with the dynamic model. In comparison to the local sensitivity analysis, the proposed model has accounted for the coupling contributions of various factors. Thus, it is far more accurate and reliable to evaluate the critical factors dominating the vehicle–track interactions. Based on the methods developed in the present study, numerical examples have been conducted to draw the following marks: track irregularities possess the dominant role in guiding the dynamic performance of vehicle–track systems, besides, the vertical stiffness of primary suspension and rail pads also shows significant influence on vertical acceleration of the car body and the wheel–rail vertical force, respectively. Finally, a method is developed to precisely extract the characteristic wavelengths and amplitude limits of track irregularities.

Funder

National Natural Science Foundation of China

Publisher

ASME International

Subject

Applied Mathematics,Mechanical Engineering,Control and Systems Engineering,Applied Mathematics,Mechanical Engineering,Control and Systems Engineering

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