Birhan, Zemenu Tsehay (2013) Effects of the Radius of Curved Rail and Vehicle Speed on Rail Friction and Wear. Masters thesis, Addis Ababa University.
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Abstract
The aim of this work is to develop a theoretical background for the influence of the curved radius of the rail line and the vehicle speed on rail tribology. The mathematical equations are derived from the geometrical relations of the curved rail, the conic nature the wheels, speed and vehicle mass. This has two parts kinematic and dynamical analytical methods. The first one is focused on the geometrical constraint analysis with the vehicle motion. It helps to formulate equations that help to calculate lateral displacement of the vehicle over the rail, longitudinal slip, lateral slip and spin. In dynamical analysis the vehicle load due to its mass, velocity is added and friction and wear conditions are derived from the relations. The material which is applied on the study is UIC 60 standard carbon steel and their wear coefficients were taken from literature. All analysis of the equations was done by using MATLAB software. From the result of the study friction and wear are exponentially reduced as the curve radius increase and velocity decreases for the case horizontal curved track at the outer rail and the opposite is happened at the inner rail. The maximum load capacity of the rail has a direct and linear relationship with the radius of the track and an inverse exponential relationship with the increase of velocity of the vehicle. Result of friction and wear of canted curved track has two different patterns; the inner and outer rail friction and wear interchangeably increases as the vehicle speed is below and above equilibrium velocity respectively. The superelvation deficiency is linearly proportional for outer wear and inversely proportional for inner rail. Then the result will be utilized for designing appropriate curved rail roads, appropriate speed restrictions for the vehicles and to plan appropriate maintenance policy.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Mechanical Engineering |
| Subjects: | T Technology > T Technology (General) T Technology > TF Railroad engineering and operation T Technology > TJ Mechanical engineering and machinery T Technology > TL Motor vehicles. Aeronautics. Astronautics |
| Divisions: | Africana |
| Depositing User: | Andriamparany Edilbert RANOARIVONY |
| Date Deposited: | 18 Oct 2018 13:11 |
| Last Modified: | 18 Oct 2018 13:11 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/6869 |
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