Simulation of Rail Vehicle Flexible Wheel Set on Curve Negotiation
| dc.contributor.advisor | Habtamu, Tekubet (Mr.) | |
| dc.contributor.author | Maedot, Menberu | |
| dc.date.accessioned | 2022-03-09T05:02:00Z | |
| dc.date.accessioned | 2023-11-04T15:17:38Z | |
| dc.date.available | 2022-03-09T05:02:00Z | |
| dc.date.available | 2023-11-04T15:17:38Z | |
| dc.date.issued | 2017-04 | |
| dc.description.abstract | Railway vehicle wheelsets suffer a great many dynamic load cycles as they rotate and excessive contact force happen on wheelset during a rail vehicle curve negotiating which makes wheelsets the most critical stressed part of a railway rolling stock and they are likely prone to a wide variety of dynamical phenomena such as static and dynamic instabilities, lateral guidance problems on curved track and ride quality. Mostly multibody models used by railway vehicle designers use totally rigid wheelsets without considering flexibility, thus leading to possible result errors vehicle under study compared with actual. The introduction of the wheelset structural flexibility allows for the determination of different quantities such as strains and stresses, and in some cases it is used to avoid numerical problems in the simulations due to a rigid connection between the axle and the wheels. This thesis considers the development of flexible wheelset model on curves through numerical simulations so that to study the influence wheelset flexibility on dynamic behaviors of wheel rail contact. Development of flexible wheelset model simulation is done by using the method called FEMBS, is an interface program between finite element (FE) analysis codes and SIMPACK. FEMBS generates input data for flexible bodies which are used for multibody system (MBS) simulations. The flexible wheelset model was developed by FEM software ANSYS that calculates a wheel deflection. Subsequently, a stress distribution with corresponding frequencies at contact patches for driving wheel is formulated. Then the ANSYS model is imported in to a multibody simulation software SIMPACK. For a simulation output results comparisons purpose a rigid wheelset the model is also simulated on SIMPACK parallely. And small radius curve exposed to severe corrugation growth on the metro of Addis Ababa light rail transit (AALRT) was selected as reference. The simulation results indicates on mid simulation time lateral force of flexible and rigid wheelsets are 100KN and 93KN respectively. The angle of attack at wheel/rail interface of the simulation result after about 2.5 second of flexible wheelset is greater than in average of the rigid wheelset model. And the wear result shows that the flexible wheelset wear no. is larger average than the rigid wheelset. Thus this study reveals that the flexibility importance of pertinent wheelset model for simulating and investigating different aspects of the vehicle-track dynamic interaction. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/30516 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Rail Vehicle Flexible Wheel | en_US |
| dc.subject | Curve Negotiation | en_US |
| dc.subject | Simulation | en_US |
| dc.title | Simulation of Rail Vehicle Flexible Wheel Set on Curve Negotiation | en_US |
| dc.type | Thesis | en_US |