Dynamics of a Rail Vehicle in Transition Curve above Critical Velocity with Focus on Hunting Motion Considering the Review of History of the Stability Studies

Abstract

The most general purpose of the current paper is to trace and discuss the history and state of the art of studies on vehicle motion (dynamics) in a transition curve above the critical velocity, with the aim of potentially increasing the circle of researchers involved in studying this issue and strengthening the will of the authors to continue their studies. This general goal is achieved in two ways: first, through a profiled literature analysis, showing the historical progress and current state of the research; and second, through reference to the history of stability studies as an example of selected studies’ development. In addition, this work has two more specific goals. Together, they consist of collecting the literature in a related field in one place and analyzing it on site to accomplish the review. Both specific goals are attained by dividing the literature into two corresponding parts. In the first part, the current issues of rail vehicle stability are analyzed and divided into four problems. The second part includes works that deal with the subject of the motion and dynamics of a rail vehicle on a transition curve section. Here, the works are divided into five groups and discussed. They are put in order from the closest to the furthest from this paper’s main subject; however, the last group includes the most recent references. In addition, information on the authors’ approach to the problem is provided, including the methods and models used, as well as example results. Based on the analysis of the literature and the state of the art, a summary of the analysis is presented at this paper’s end. It highlights the small number of works on the subject of interest, and based on the review of stability studies, it seeks to encourage present and potential authors to study this field and share their results with society.

The Nonlinear Lateral Stability of a Four-Axle Freight Car with Y25 Bogies and Measures to Improve Its Faults

“…It comprises all significant conditions of motion, that is, transition curves (TCs), circular curves (CCs), and straight tracks (STs). Athe same time, TCs are of elevated interest in this approach for three reasons: (1) in terms of the track shape geometry, they are three-dimensional objects, while CCs and STs are two-dimensional and one-dimensional objects, respectively; (2) in terms of place and geometry, TCs represent the transitions from STs to CCs and vice versa; and (3) the dynamics of vehicles on TCs, especially around vn, is less researched than their dynamics on STs and CCs. A draft of this novel approach is described in [1].…”

“…Athe same time, TCs are of elevated interest in this approach for three reasons: (1) in terms of the track shape geometry, they are three-dimensional objects, while CCs and STs are two-dimensional and one-dimensional objects, respectively; (2) in terms of place and geometry, TCs represent the transitions from STs to CCs and vice versa; and (3) the dynamics of vehicles on TCs, especially around vn, is less researched than their dynamics on STs and CCs. A draft of this novel approach is described in [1]. The primary tool in the mentioned studies is the numerical simulation of vehicles' dynamics using numerical models.…”

Nonlinear Lateral Stability of 4-Axle Freight Car with the Y25 Bogies and the Measures to Improve Its Faults

“…Besides, the TC section is of the higher status in the approach for three reasons: 1 -in terms of track shape geometry, it is a 3-dimensional object, while CCs and ST are 2-dimensional and 1dimensional objects, respectively; 2 -in terms of place and geometry TC makes the transitional object from ST to CC and vice versa; and 3 -dynamics of vehicles in TC, especially around the vn, is less researched than dynamics in ST and CC. The draft of the novel approach is described in [1]. The primary tool in the mentioned studies is the numerical simulation of vehicles' dynamics using their numerical models.…”