The current state of the highway pavement makes it possible to implement prompt transportation operations. These circumstances lead to the movement of vehicles at high speeds, which is impossible without a braking system capable of ensuring high braking efficiency and optimal flow of the process from the standpoint of stability and controllability.
One of the main requirements for a modern automatic transmission braking system is the stability of the initial parameters, that is, parametric reliability. Therefore, it is important to have data on the brakes' operating modes and energy consumption. Only with such data is it possible to create a braking system whose output characteristic will be sufficiently stable under conditions of high energy load.
Therefore, it is no coincidence that the international methodology for testing the effectiveness of vehicle brakes (UNECE Rule 13) provides for Test I, which is characterized by cyclic braking (urban conditions), and Test II, which is characterized by prolonged braking (mountain conditions).
The brake mechanism is the most unstable link of the brake system; one way to increase its efficiency is to ensure sufficient energy capacity, which is limited by the temperature of the friction surface.
The object of the study is the question of the equivalence of the change in the drum radius and the width of the friction belt of the brake, taking the invariance of the temperature of the friction surface under the selected test mode as the criterion of equivalence. It is shown that the role of the drum's side wall on the brake's temperature mode under different test modes can also be evaluated on grid thermal models with the involvement of the "Fourier–2 x,y,z" software complex.
The effect of the heat transfer coefficient on the temperature mode of the brake due to the consideration of the gap between the drum wall and the wheel rim is shown. Derived formulas for determining the friction belt's equivalent width under the equality of heat flows, masses, and cooling surfaces.
1. Bulgakov, M., Shuklynov, S., Uzhva, A., Leontiev, D., Verbitskiy, V., Amelin, M., & Volska, O. (2020). Mathematical model of the vehicle initial rectilinear motion during moving uphill. In IOP Conference Series: Materials Science and Engineering (p. 012022). IOP Publishing. doi: 10.1088/1757-899X/776/1/012022 (in English). https://doi.org/10.1088/1757-899X/776/1/012022
2. Shuklinov, S., Leontiev, D., Makarov, V., Verbitskiy, V., & Hubin, A. (2020). Theoretical Studies of the Rectilinear Motion of the Axis of the Locked Wheel After Braking the Vehicle on the Uphill. In International scientific-practical conference (pp. 69-81). Cham: Springer International Publishing. doi: 10.1007/978-3-030-58124-4_7 (in English). https://doi.org/10.1007/978-3-030-58124-4_7
3. Bogomolov, V. A., Klimenko, V. I., Leontiev, D. N., Ponikarovska, S. V., Kashkanov, A. A., & Kucheruk, V. Y. (2021). Plotting the adhesion utilization curves for multi-axle vehicles. Bulletin of the Karaganda university, 1 (101), 35-45. doi: 10.31489/2021Ph1/35-45 (in English). https://doi.org/10.31489/2021ph1/35-45
4. Leontiev, D., Klimenko, V., Mykhalevych, M., Don, Y., & Frolov, A. (2019, June). Simulation of working process of the electronic brake system of the heavy vehicle. In International scientific-practical conference Advances in Intelligent Systems and Computing (pp. 50-61). Cham: Springer International Publishing. doi: 10.1007/978-3-030-25741-5_6 (in English). https://doi.org/10.1007/978-3-030-25741-5_6
5. Diachuk, M., Lykhodii, O., Leontiev, D., Ryzhykh, L., & Aleksandrov, Y. V. (2022). Dynamic modeling of semitrailer trucks equipped by steered wheels. Journal of Mechanical Engineering and Sciences, 16(1), 8691-8705. doi: 10.15282/jmes.16.1.2022.04.0687 (in English). https://doi.org/10.15282/jmes.16.1.2022.04.0687
6. Podrigalo, M., Klets, D., Kholodov, M., Bogomolov, V., Turenko, A., Molodan, A., ... & Hatsko, V. (2019). The Improvement Brake's Qualities of Vehicle by Developing the Method of the Choosing Frictional Pairs of the Brakes Mechanisms. Retrieved from: https://doi.org/10.4271/2019-01-2145 (in English). https://doi.org/10.4271/2019-01-2145
7. Gudz, G., Zakhara, I., Voitsikhovska, T., Vytvytskyi, V., & Ropyak, L. (2022). Temperature Distribution in Parts of the Vehicle Disk Brake. In Advanced Manufacturing Processes IV: Selected Papers from the 4th Grabchenko's International Conference on Advanced Manufacturing Processes, (pp. 517-529). doi:10.1007/978- 3-031-16651-8_49. (in English). https://doi.org/10.1007/978-3-031-16651-8_49
8. Hudz H., S., Hlobchak M., V., & Zakhara I., I. (2018). Teplovyi rozrakhunok dyskovykh halm avtomobiliv na tsyklichnykh rezhymakh roboty [Thermal calculation of automotive disc brakes in cyclic operating conditions]. Lviv: Halych-Pres (in Ukrainian).
9. Yedyni tekhnichni prypysy shchodo ofitsiinoho zatverdzhennia dorozhnikh transportnykh zasobiv katehorii M, N ta O stosovno halmuvannia [Unified technical requirements for the official approval of road vehicles of categories M, N and O with regard to braking]. (2001). DSTU UN/ECE R 13-09:2004. Retrieved from: https://online.budstandart.com/ua/catalog/doc-page.html?id_doc=54129 (in Ukrainian).
10. Hudz H. S., Hlobchak M. V. (2023). The influence of important factors on the distribution of heat flows in elements of drum brakes of vehicles. Transport technologies, 4(1), 83-89. doi: 10.23939/tt2023.01.083 (in English). https://doi.org/10.23939/tt2023.01.083
11. Hilchuk A. V., Chalatov A. A., & Donyk T. V. (2020). Teoriia teplorovidnosti [The theory of thermal conductivity]. Kyiv: National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" (in Ukrainian).
12. Hudz H. S., Herys M. I., Hlobchak M. V., Klypko O. R. (2021). Porivnialna otsinka barabannykh i dyskovykh halm avtomobilnykh kolis za enerhoiemnistiu [Comparative assessment of drum and disc brakes for car wheels by energy capacity]. Naukovyi visnyk NLTU Ukrainy [Scientific Bulletin of UNFU], 31(6), 74-78. doi: 10.36930/40310611 (in Ukrainian). https://doi.org/10.36930/40310611
13. Tryshevskyi O. I., Saltavets M. V., Vorobjov D. S. (2019). Metodyka rishennia zvorotnykh zadach teploprovidnosti [Technique of solution of reverse tasks of heat conduction]. Visnyk Natsionalnoho tekhnichnoho universytetu "KhPI" [Bulletin of the National Technical University "KhPI"], 31(1306), 81-85 (in Ukrainian).
14. Scherbakov V. K., & Lebed N. L. (2020). Matematychne modeliuvannia teplofizychnykh protsesiv [Mathematical modeling of thermophysical processes]. Kyiv: National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" (in Ukrainian).