Explanipedia

Nonlinear Features of Railway Vehicles in Motion on a Transition Curve with Velocities Around Critical in the Context of Motion Conditions Open

K. Zboiński, Milena Gołofit-Stawińska · 2025

This paper presents numerical simulation results on the nonlinear features of railway vehicles moving in transition curves at velocities close to the critical velocity. It examines six objects representing railway vehicles: three 2-axle bo…

Railway Transition Curves Curvature for High-Speed Trains – Should It Be Smooth in the Extreme Points or Not, or Something Else? Open

K. Zboiński, Piotr Woźnica · 2025

This work addresses the features of railway transition curves’ curvature, especially at extreme points. In particular, should it be smooth at the extreme points or not, or something else? Such a question is not accidental. This is based on…

Nonlinear Features of Railway Vehicles in Motion on a Transition Curve with Velocities Around Critical in the Context of Motion Conditions Open

K. Zboiński, Milena Gołofit-Stawińska · 2025

This paper presents numerical simulation results on the nonlinear features of railway vehicles moving in transition curves at velocities close to the critical velocity. It examines six objects representing railway vehicles: three 2-axle b…

The influence of worn and nominal rail profiles on railway vehicle motion and dynamics Open

K. Zboiński, Jacek Kukulski, Milena Gołofit-Stawińska, Piotr Woźnica · 2025

In this study the rail wear influence on safety of rail vehicle motion is assessed. The profile measurements for the nominal rail head and for the slightly worn and heavily worn rail heads were performed. Then, these measured real values w…

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

M. Dusza, Milena Gołofit-Stawińska, K. Zboiński · 2024

This paper presents investigations of rail vehicle bogies of the Y25 type. The Y25 bogie family is one of the most commonly used freight car bogie designs. In addition to several significant advantages characterising this design, several d…

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

M. Dusza, Milena Gołofit-Stawińska, K. Zboiński · 2024

The article presents investigations of rail vehicle bogie of Y25 type. The Y25 bogie family is one of the most commonly used freight car bogie designs. In addition to several significant advantages characterising this design, it also has s…

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 Open

K. Zboiński, Milena Gołofit-Stawińska · 2024

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 ci…

Optimum railway transition curves for different circular arc radii Open

K. Zboiński, Piotr Woźnica · 2022

This article concerns assessing the dynamical properties and shape optimization of railway transition curves (TCs) for the wide range -600, 900, 1200, 2000, 3000, and 4000 m -of circular arc radii.The search for the optimum shape means in …

Determination and Comparative Analysis of Critical Velocity for Five Objects of Railway Vehicle Class Open

K. Zboiński, Milena Gołofit-Stawińska · 2022

The purpose of this article is to determine the critical velocities for five railway vehicle objects and to find possible generalizations of these results. It is done in the context of increasing the safety of travel on modern railways. Th…

Railway transition curves – optimization and assessment Open

K. Zboiński, Piotr Woźnica · 2022

This article relates to optimization and assessment of railway polynomial transition curves. The search for the optimum shape meant here the evaluation of the transition curve properties based on chosen dynamical quantity and generation of…

Modelling of the shape of railway transition curves from the point of view of passenger comfort Open

K. Zboiński, Piotr Woźnica, Yaroslav Bolzhelarskyi · 2021

In the past, railway transition curves were not used. Instead of it, a simple connection of the straight track and circular arc was applied. Nowadays, such simplicity is not allowed due to the increasing vehicle operating velocities. It is…

Optimum Railway Transition Curves—Method of the Assessment and Results Open

K. Zboiński, Piotr Woźnica · 2021

This article discusses the optimization of railway transition curves, through the application of polynomials of 9th and 11th degrees. In this work, the authors use a 2-axle rail vehicle model combined with mathematically understood optimiz…

Is the cubic parabola really the best railway transition curve? Open

K. Zboiński, Piotr Woźnica · 2021

In the current study, the authors tested two railway transition curves in terms of their usefulness for railway practice. The first curve was a cubic parabola – the curve most popular in railway engineering. The second curve was a polynomi…

Investigation into nonlinear phenomena for various railway vehicles in transition curves at velocities close to critical one Open

K. Zboiński, Milena Gołofit-Stawińska · 2019

In this paper recent simulation results aimed at studying nonlinear phenomena that accompany motion of railway vehicle in transition curve at velocities around the vehicle critical velocity are presented by the authors. Such results concer…

Kolejowe wyjazdowe krzywe przejściowe a dynamika poprzeczna pojazdu Open

Piotr Woźnica, K. Zboiński · 2018

Artykuł dotyczy optymalizacji kształtu kolejowych krzywych przejściowych (KP) wyjazdowych.Określenie "wyjazdowa" w stosunku do krzywej przejściowej odnosi się do zasadniczego kierunku jazdy pojazdów szynowych,

THE IMPACT OF PRIMARY SUSPENSION STIFFNESS OF 2-AXLE BOGIE OF MKIII PASSENGER CAR ON ITS DYNAMICAL BEHAVIOUR Open

K. Zboiński, Milena Gołofit-Stawińska · 2018

This article presents results of the study on the impact of stiffness in vehicle primary suspension for lateral direction kzy and longitudinal direction kzx. The study was carried out for 2-axle bogie of MKIII passenger car. The problem wa…

Bifurcation analysis of 4-axle rail vehicle models in a curved track Open

K. Zboiński, M. Dusza · 2017

The article presents authors' recent results on nonlinear lateral stability of rail vehicles in a curved track. The theories of self-exciting vibrations and bifurcation are the key elements here. The general objective is presentation of ex…

Optimization of Polynomial Transition Curves from the Viewpoint of Jerk Value Open

K. Zboiński, Piotr Woźnica · 2017

The aim of the presented paper is to show the results of shape optimization of railway polynomial transition curves (TCs) of 5 th , 7 th , and 9 th degrees through the use of the full vehicle model and new criteria of assessement concernin…

Modeling, Simulation, and Results of Their Use in Railway Vehicle Dynamics Studies Open

K. Zboiński · 2015

This chapter focuses on problems related to building mathematical and numerical models of railway vehicle dynamics and then using these models in the process of vehicle dynamics simulation. Finally, the results of such simulations devoted …

Optimisation of polynomial railway transition curves of even degrees Open

K. Zboiński, Piotr Woźnica · 2015

This paper represents new results obtained by its authors while searching for the proper shape of polynomial railway transition curves (TCs). The search for the proper shape means the evaluation of the curve properties based on chosen dyna…

K. Zboiński YOU? Author Swipe