Tsadiku, Mintesnot (2014) Contact Point Dynamics of Wheel-Rail Geometry (Influence of roll and yaw angle on wheel-rail contact point and lateral displacement of wheelset for single point contact on a straight track). Masters thesis, Addis Ababa University.
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Abstract
In this paper, the influence of roll and yaw angle on lateral displacement and wheel contact point, single contact point, has been studied by developing a model and program. The characteristics of geometric contact between wheel and rail is important because it ensures the guidance and the running stability of the vehicle but also gives rise to damage because of the high contact forces which is influenced by the contact area and point. To model the contact between wheel and rail in Multibody system approach, the two bodies were consider as rigid bodies and using the principle of two bodies in contact; no penetration, unit normal of the surfaces are parallel and there is a point in one body that has the same location in space as a point in the other body. To formulate the above principle into equation, we have defined coordinate system; Rail reference frame, wheelset body frame, wheel and rail local coordinate system and initial coordinate system. After formulating the equations using first order theory, which are non linear equations, Trust-Region Dogleg numerical method was used to solve the non linear equations. Using measured data of wheel and rail profile the results were graphically presented as the roll and yaw angle changes with respect to lateral displacement and wheel contact point. Finally, a MatLab program was developed that solves the non linear equation and present the results, which could be further developed in to full grown software.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Yaw angle, Roll angle, wheel-rail contact geometry, lateral displacement, single contact point, wheelset, Multibody system approach, contact dynamics, TrustRegion Dogleg, numerical method, MatLab |
| Subjects: | H Social Sciences > HD Industries. Land use. Labor > HD28 Management. Industrial Management Q Science > QA Mathematics T Technology > T Technology (General) T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Africana |
| Depositing User: | Andriamparany Edilbert RANOARIVONY |
| Date Deposited: | 29 Oct 2018 13:36 |
| Last Modified: | 29 Oct 2018 13:36 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/7111 |
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