||Preliminary Development of the Mechanical-Empirical Based Wearing Model for the Conductor Rail in the Medium Capacity Transit System
||Department of Civil Engineering
||Fredrick Wahyu Christianto
medium capacity transit system
number of load repetition to failure
In the conductor rail system, cyclic loadings by train will make wear on the conductor rail and wear plate over time. Generally, there are three types of the performance model, which are empirical, mechanical, and mechanical-empirical (M-E) model, that mostly use to describe the wear. However, there is no performance model based on the M-E approach for the conductor rail system at present. Therefore, there is an urgent need to develop the M-E based wearing deterioration model which allow to consider the in-service condition of the conductor rail and wear plate. There are three types of data collected to establish M-E based wear model for the conductor rail system in the MCTS. First was the component specifications of the wear plate, conductor, and collector shoe. Second was the data related to the service condition, such as train speed, electric current, and vibration of the collector shoe. Last was the inspection data of the wear plate and conductor rail. There were two proposed M-E based wear model, one for wear plate and the other for conductor rail. The parameters in the model include normal load, speed, hardness, and electric current. The result of the M-E based wear model for wear plate showed that the higher the wear level, the lower the percent error. For conductor rail, the percent errors were irrelevant to wear level and are stable below 16%.
TABLE OF CONTENTS IV
LIST OF TABLES VI
LIST OF FIGURES VII
1 CHAPTER ONE INTRODUCTION 1
1.1 Background 1
1.2 Research Objective 2
1.3 Scope of Research 3
2 CHAPTER TWO LITERATURE REVIEW 4
2.1 Wear Models 5
2.1.1 Wear Model in Conductor Rail System 5
2.1.2 Effect of Electric Current to Wear in Railway Electrification System 6
2.2 Mechanical, Empirical, and Mechanical-Empirical Modelling in Railway Engineering 7
2.2.1 Mechanical Model in Railway Engineering 7
2.2.2 Empirical Model in Railway Engineering 8
2.2.3 Mechanical-Empirical (M-E) Model in Railway Engineering 8
3 CHAPTER THREE DATA COLLECTION AND THEORETICAL DERIVATION 10
3.1 Material Specification and Field Collected Data 10
3.1.1 Material Specifications for the Conductor Rail System 10
3.1.2 Interaction between Conductor Rail and Collector Shoe 15
3.1.3 Field Inspection Data 18
3.2 Wearing of the Conductor Rail System 20
3.2.1 Wearing due to Sliding Mechanism (QM) 21
3.2.2 Wear due to Electrical Erosion (QE) 31
3.3 Number of Load Repetition to Wearing Level 31
3.4 Determination of M-E Model Coefficient 35
4 CHAPTER FOUR RESULT AND DISCUSSION 37
4.1 Wear Depth from Field Inspection 37
4.1.1 Nonparametric Statistical Analysis of Wear Depth Inspection 37
4.1.2 Grouping of the Inspection Data 39
4.2 Proposed M-E Wearing Model 47
4.2.1 Calibration of M-E Model Coefficients 47
4.2.2 M-E Model Validation 49
4.2.3 Discussion 56
5 CHAPTER FIVE CONCLUSIONS AND RECOMMENDATION 57
5.1 Conclusions 57
5.2 Recommendation 58
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