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Multibody Systems Approach To Vehicle Dynamics

The paper is part of the publication series, which describe the most significant and innovative research and development design solutions and computational procedures as part of European structural funds project The object of this article is strength conditions assessment of changed structure of three axle bogie frame, which is characterized below by higher axle loads combined with good operational properties The occasion of change was the unstable behaviour of the system during prototype tests For validation of the new structure design, there has been created a substitute simulation model in program ANSYS Results of calculations prove, that new structure of the bogie frame satisfies strength assessments This publication is the result of the project implementation: Development of two types of freight wagon with bogies for non-standard wheelbase or track wheelset, complying with the criteria for interoperability, environmental issues, safety and reliability ITMS: 26220220070 supported by the Operational Programme Research and development funded by the ERDF

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Computer aided structural analysis of newly developed railway bogie frame

The wear of rails and rail wheels is important problem in rail traffic. The change of the shape of the wheel profile has not only a great influence on the dynamic properties of the vehicle (like stability, safety by passing curved tracks, etc.), but also affects the ride comfort of passengers and environmental insults. In extreme cases it can cause rail derailment, which is unwanted status. For these and other reasons, great effort is brought to create a software, which would be capable to compute the wear of a rail wheel profile. The presented article demonstrates how the change of the rail profile influences the resulting contact stresses. The wheel and rail geometries were created by using the CAD software CATIA. For the creation of the rail profile, the PYTHON programming language was used, because the imported .step file caused inaccuracies during import. The contact stresses were computed by using the commercial FEM software ABAQUS, and the results were compared with other methods which are used to calculate contact stresses.

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Analysis of Contact Stresses of Theoretical and Worn Profile by Using Computer Simulation

This contribution deals with the computer simulation and the follow analysis of the rail vehicle running with wheel flat. It comprises of two parts. The first part addresses to the problem of rail vehicle operational, which wheel is damaged. There are several types of wheel damages. In this work the wheel flat problem is introduced. Generally, the rail vehicle running with wheel flat is adverse because the track can be shopworn, some parts of rail vehicle can be damaged and also operational condition for passenger or goods (depending on kind of rail vehicle) can be worse markedly. There is also included a system of forces and accelerations measurement during rail vehicle running on the given track section. The second part includes computer modelling and simulation of this phenomenon. Analyses were focused on the assessemnt of the rail vehicle motion smoothness and its damaging impact on the track. For this, there was created computer model of a twin-bogies passenger car, which the one wheel was modelled as damaged, i.e. wheel flat. Then, there were performed simulations of the rail vehicle running at various speeds. The passenger car was run on the straight track without irregularities in order to avoid adding excitation. Subsequently, values of the vertical wheel forces of the wheel with flat was evaluated.

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Simulation Analysis of the Effects of a Rail Vehicle Running with Wheel Flat

Vibration Analysis of a Coach with the Wheel-flat Due to Suspension Parameters Changes☆

This article describes the determination of geometric, mass and stiffness parameters of the individual part of plateau wagon. After measurements were taken the position change of the chassis of the vehicle body and wheel when driving the vehicle over obstacles was observed. The obstacles were formed by wedges. Experimental detection of parameter has been used in the analytical investigation of kinematically excited system of three-body space flexibly stored and linked.

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Dynamic Measurement of Four-Axle Railway Wagon

The paper dealt with the influence of geometric asymmetry on the vertical vibration of symmetrically or asymmetrically loaded mechanical system. The system is composed of rigid flexibly linked elements. Kinematic excitation was carried out by a unit jump (jump of the springs), excitation of system was symmetric and asymmetric. The system of elements was examined experimentally and numerically. The numerical model was verified by experimental solution. Numerical solutions were carried out by finite element method (FEM) applied to model that respected the design and conditions of the laboratory model for experimental investigations. The aim of the work was to create a numerical model based on the finite element method and to verify the results of the model. The obtained results can be applied to flexible storage machines.

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Verification of Numeric Solution by Experiment for Examination Vertical Oscillation of a Mechanical System

The aim of this study was to find possibilities of using the Fourier transform in the analysis of vibration load tests of heterogeneous mechanical systems, especially those of a biological nature. The study applied the idea that the dispersion of a stationary stochastic signal depends on its power spectral density. We have verified that a sophisticated reduction in the spectral power of the ergodic signal may be used to filter it effectively. The proposed procedure is suitable for the detection and separation of harmonic artefacts. We have created an algorithm in the MATLAB environment and tested its functionality when analysing the vibration transfer within the human axial system.

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Using the Fourier Transform in the Analysis of Vibration Load Tests of Heterogeneous Mechanical Systems

The article deals with the problem of vertical vibration of vehicle model driving a horizontal curve of radius R = 100 m. A brief theoretical work on the topic is presented in the introduction part. Where a descriptions of the forces acting on the vehicle while passing through the curve are discussed. In the second part of this work, a detailed description of the vehicle model is given. The equations of motion of the vehicle model are then derived for vertical dynamic response of the mechanical system considered herein. Analysis of the effect of asymmetry is then performed when the vehicle is driving the curve at a constant speed v = 30 km/h, excitated by general kinematic excitations. Firstly, the asymmetrical model is considered and the results are then compared to a fully symmetrical model.

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Martin Svoboda

Papers

Dynamic Measurement of Four-Axle Railway Wagon

Verification of Numeric Solution by Experiment for Examination Vertical Oscillation of a Mechanical System

Using the Fourier Transform in the Analysis of Vibration Load Tests of Heterogeneous Mechanical Systems

Investigation of Vertical Vibration of a Vehicle Vodel Driving Through a Horizontal Curve

Analytic Analysis of a Cam Mechanism