Abstract
This work studies a mathematical model of a bogie, the aim being to investigate the correlation between the lateral motion of the bogie and lateral irregularities of the track that the bogie is running along. When modelling the wheel-rail forces real wheel and rail profiles are used. One of the main differences between this work and previous ones is that the vertical degrees of freedom are included making the model very realistic as this allows a dynamic calculation of the penetration depth in the contact area.
In chapter two the model of the bogie is described, this is followed by a chapter describing how the wheel-rail interaction is modelled. The fourth chapter gives a presentation of the numerical algorithms used in this work.
The fifth chapter presents the results obtained during this work, it begins with an brief investigation of the dynamics when running on a straight track. The second section introduces some statistical measures and treats centerline irregularities when running with a fixed speed of 30 m/s. The following section investigates the behaviour of the model when the track possesses gauge irregularities. The fourth and fifth sections describe the changes observed when changing the velocity of the railway vehicle and the phase between the sinusoidal irregularities of the rails. In the final section the eigenfrequencies of the bogie are found and the most important modes are described. Chapter six is a discussion of the obtained results, and these are related to the possibility of measuring track irregularities using accelerometers mounted on the bogie. Finally, some appendixes are included bringing some details of the derivations related to the wheel-rail interaction and details about the used pro files.
In chapter two the model of the bogie is described, this is followed by a chapter describing how the wheel-rail interaction is modelled. The fourth chapter gives a presentation of the numerical algorithms used in this work.
The fifth chapter presents the results obtained during this work, it begins with an brief investigation of the dynamics when running on a straight track. The second section introduces some statistical measures and treats centerline irregularities when running with a fixed speed of 30 m/s. The following section investigates the behaviour of the model when the track possesses gauge irregularities. The fourth and fifth sections describe the changes observed when changing the velocity of the railway vehicle and the phase between the sinusoidal irregularities of the rails. In the final section the eigenfrequencies of the bogie are found and the most important modes are described. Chapter six is a discussion of the obtained results, and these are related to the possibility of measuring track irregularities using accelerometers mounted on the bogie. Finally, some appendixes are included bringing some details of the derivations related to the wheel-rail interaction and details about the used pro files.
| Original language | English |
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| Place of Publication | Kgs. Lyngby |
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| Publisher | Technical University of Denmark |
| Number of pages | 122 |
| Publication status | Published - 2001 |