Abstract
The search for fast, reliable and cost effective means of transport that presents better energy efficiency and less impact on the environment has resulted in renewed interest and rapid development in railway technology. To improve its efficiency and competitiveness, modern trains are required to travel faster, with high levels of safety and comfort and with reduced Life Cycle Costs (LCC). These increasing demands for vehicle requirements imposed by railway operators and infrastructure companies include maintaining the top operational speeds of trainsets during their life cycle, having low LCC and being track friendly. This is a key issue in vehicle design and in train operation since it has a significant impact on the safety and comfort of railway systems and on the maintenance costs of vehicles and infrastructures. The purpose of this work is to analyze how the wear progression on the wheelsets affects the dynamic behavior of railways vehicles and its interaction with the track. For this purpose a vehicle, assembled with new and worn wheels, is studied in realistic operation scenarios. The influence of the wheel profile wear on the vehicle dynamic response is assessed here based on several indicators used by the railway industry. The running stability of the railway vehicles is also emphasized in this study.
Highlights
To improve the efficiency and competitiveness of railway transport with respect to other means of transportation it is necessary, among others, to minimize the damage on vehicles caused by the track conditions and to decrease the infrastructure deterioration due to the trains operation
The influence of the wheel profile wear on the vehicle dynamic response is assessed here based on several indicators used by the railway industry
During the design phase of a new railway system one of the most important issues that arises is the optimization of the dynamic behavior of railway vehicles and the construction features of the infrastructure
Summary
To improve the efficiency and competitiveness of railway transport with respect to other means of transportation it is necessary, among others, to minimize the damage on vehicles caused by the track conditions and to decrease the infrastructure deterioration due to the trains operation. Analysis can be carried out to evaluate the impact of design changes or failure mode risks in a much faster and less costly way than the physical implementation and test of those changes in real systems Computational tools with such characteristics can be used to support the improvement of existing rolling stock, by proposing optimized solutions for vehicles in order to minimize the wear evolution and/or the vehicle-track interaction forces. They present a methodology to minimize the wheel wear by optimizing the primary suspension stiffness and the centre plate friction of a self-steering three-piece bogie without compromising the vehicle stability In this text, a software is applied to study the impact of wheel wear on the dynamic behavior of railway vehicles and on the corresponding loads transmitted to the track. The objective was to improve the modeling capabilities of the softwares used to study the dynamic response of railway systems in order to enhance the wheel wear prediction techniques
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