Thermal Analysis of Different Train Brake Disc Shapes by Finite Element Method: Case Study on Addis Ababa Light Railway Transit
| dc.contributor.advisor | Demis, Alemu (PhD) | |
| dc.contributor.author | Nuredin, Nerhusien | |
| dc.date.accessioned | 2022-04-14T09:05:41Z | |
| dc.date.accessioned | 2023-11-04T15:17:44Z | |
| dc.date.available | 2022-04-14T09:05:41Z | |
| dc.date.available | 2023-11-04T15:17:44Z | |
| dc.date.issued | 2021-09 | |
| dc.description.abstract | Disc brake is used to decelerate and stop a train. During the process, kinetic energy is changed into heat energy due to the friction between the disc surface and disc pad. The main problem with braking and stopping a vehicle is the huge quantity of heat flux that enters the disc in a short period of time, causing a rapid temperature rise which leads to brake fade, gas build-up, and stress. Therefore, it is important to come up with a way of reducing the temperature- rise by investigating the thermal behavior of the train brake disc. In this paper the thermal analysis and comparison of four different brake disc models is done using ANSYS 19.2 software. The analyzed brake discs are modelled using the design specifications of Addis Ababa light railway transit by SOLIDWORKS13. The disc models include one model with straight cooling fins and without a surface drill and 3 models with a curved cooling fins and equally spaced surface drills. The three drilled models also include one model with holes of 5 mm diameter, one model with holes of 7.5 mm diameter, and other model with holes of 10 mm diameter to investigate the effect of varying the holes’ diameter on the temperature-rise. The analysis of each model is done at emergency braking conditions of Addis Ababa light railway transit (at 9.72s braking time, 2 ��/��^2 deceleration and at a speed of 19.44m/s) by considering air cooling and maximum gradient of Addis Ababa light railway transit (3.150). Sic/6061Al alloy is used as a comparison material thereby to show its effectiveness at emergency braking and at the highest gradient. ANSYS-FLUENT is used to calculate the average heat transfer coefficient of each model so as to use it as a boundary condition for the thermal analysis. In addition to this, the structure of each model is investigated so as to show the maximum von-mises stresses and deformations. It has been shown that adding a surface drill and increasing the diameter of the drilled holes has a significant effect on enhancing the heat transfer coefficient value thereby reducing the maximum temperature-rise. The disc model with hole diameter of 10 mm is the best (348.33℃), the model with hole diameter of 7.5 is the second best (377.5℃), and the model with hole diameter of 5 mm takes the third rank (382.09℃) while the non-drilled model is the worst (399.81℃). The model having holes of 10 mm diameter is recommended to be utilized by Addis Ababa light railway transit by using the Sic/6061Al alloy brake disc material. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/31342 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | ANSYS-FLUENT, ANSYS 19.2 | en_US |
| dc.subject | CFD | en_US |
| dc.subject | SOLIDWORKS13 | en_US |
| dc.subject | von-mises stress | en_US |
| dc.subject | transient thermal | en_US |
| dc.subject | transient structural | en_US |
| dc.subject | transient structural | en_US |
| dc.title | Thermal Analysis of Different Train Brake Disc Shapes by Finite Element Method: Case Study on Addis Ababa Light Railway Transit | en_US |
| dc.type | Thesis | en_US |