Abstract
Once operating trains are disabled on the railway lines, an efficient manner is to utilize the train for train rescue. Owning to the different train and coupler types, it is difficult to formulate uniform regulations for train to train rescue. In this paper, the longitudinal train dynamics of electric multiple units under rescue were analyzed by field and laboratory tests. The angling behavior of the braking-induced coupler under compressed in-train forces was analyzed. A dynamic model for the train and draft gear system was developed considering accurate boundary limitations and braking characteristics. The safety indices and its limits for the coupled rescue train were defined. The dynamic evaluations of different train to train rescue scenarios were analyzed. It is indicated that the coupler vertical rotation occurs during the emergency braking applied by the assisting train. The vertical force components of in-train forces lead to the carbody pitch behavior and even cause local destructions to the coupler system. The carbody pitch motion can arise the inference of in-train devices. Based on the safety evaluation of train and coupler system, the regulations for typical train to train rescue scenarios were formulated.
Highlights
In order to improve the efficiency of rescuing high-speed trains disabled on the railway lines, the train to train rescue method has been proposed
According to the testing and numerical analyses of longitudinal train dynamics for electric multiple units (EMU) under rescue, the following conclusions can be drawn: 1. During process of the train to train rescue, the in-train forces are generated by the braking force applied by the assisting train while the assisted train does not possess the braking ability
The in-train force is closely relevant to the weight of train configuration and the braking deceleration
Summary
In order to improve the efficiency of rescuing high-speed trains disabled on the railway lines, the train to train rescue method has been proposed. The occurrence of compressed coupler angling behavior will further lead to local destructions and in-train interference, which affects the running safety of the coupled train [2]. It was indicated that the lateral and vertical rotational behavior of coupler occurred during compressed in-train forces, which further arose train derailment accidents. As the structural diversity of domestic EMUs, especially the coupler and draft gear system, the possible combinations of train to train rescue scenarios are complicated. This makes it difficult to formulate the operation regulation for train to train rescue. The systemic studies of longitudinal train dynamics for EMUs under rescue are conducted to give insight into its occurring mechanism and safety relevant issues. The running safety for different train to train rescue scenarios was evaluated
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