Wyniki wyszukiwania - BazTech

1

Modelling and simulation of adhesion of the rail vehicle

Lewandowski Mirosław, Grzesikiewicz Wiesław, Makowski Michał, Rutczyńska-Wdowiak Katarzyna

Journal of Automation, Electronics and Electrical Engineering

|

2022

|

Vol. 4, No. 2

17--21

EN

In the paper we consider the issue related to the phenomenon of wheel-to-rail adhesion. This issue concerns self-excited vibrations in the area of wheel-rail contact, caused by unstable friction. Such friction is characterized by decreasing values of the friction coefficient with increasing slipping velocity. The paper includes mathematical formulation of the problem and presents the method for solving it. In addition, a simulation of elementary vehicle driving was performed. During the simulation, self-excited vibrations arose during wheel slip caused by high driving torque. The paper presents graphs illustrating the tangential force and the slipping velocity during these vibrations.

2

Numerical investigation of the influence of aerodynamic forces and wheel dynamic loads of a vehicle subjected to kinematic excitations

Makowski Michał, Grzesikiewicz Wiesław

Vibrations in Physical Systems

|

2019

|

Vol. 30, nr 2

art. no. 2019221

EN

This paper presents the investigations of vibrations of a vehicle equipped with controlled magneto-rheological (MR) dampers and aerodynamic elements. A scaled sports vehicle model was developed to conduct this research. The tests were carried out with kinematic excitation resulting from road roughness and motion at a variable speed. During the airflow, the aerodynamic elements forces and moments on the test body. Vehicle vibrations are limited by the means of MR controlled dampers. The damping force is determined on the basis of an algorithm, where various strategies for determining forces in MR damper have been adopted. Two criteria were considered for assessing the effectiveness of the control algorithm - minimising vertical acceleration and changes in wheel normal reactions on road surface. This paper presents the results of those studies.

3

Modelowanie drgań pojazdu wyposażonego w tłumiki MR i płaty aerodynamiczne

Grzesikiewicz Wiesław, Makowski Michał

Autobusy : technika, eksploatacja, systemy transportowe

|

2019

|

R. 20, nr 1-2

57--61

PL

Rozpatrywany jest model pojazdu wyposażony w sterowane tłumiki magneto-reologiczne (MR) oraz sterowane płaty aerodynamiczne. Analizowane są drgania pojazdu poruszającego się z dużą prędkością w trakcie przyspieszanie i hamowania. Celem tej analizy jest ustalenie wpływu sił powstających na płatach aerodynamicznych na drgania pojazdu oraz na zmiany nacisku kół na nawierzchnię drogi podczas przyspieszania i hamowania. W prezentowanej pracy przedstawione zostały wyniki badań numerycznych uzyskanych na podstawie opracowanego modelu pojazdu.

EN

We considered of a vehicle model equipped with controlled magneto-rheological (MR) dampers and controlled aerodynamic elements. The vibrations of the vehicle moving at high speed during acceleration and braking are analysed. The purpose of this analysis is to determine the effect of forces generated on aerodynamic elements on vehicle vibrations and changes in wheel pressure on the road surface during acceleration and braking. The presented work presents the results of numerical investigations obtained on the basis of the developed vehicle model.