TY  - CONF
AU  - Milković, Dragan
AU  - Simić, Goran
AU  - Lučanin, Vojkan
AU  - Radulović, Saša
AU  - Kostić Miličić, Aleksandra
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7284
AB  - Geometric-kinematic calculations and experimental proof tests of the mutual position of assemblies and sub-assemblies of wagons that are in relative displacement are significant in developing new types of railway vehicles and especially in the application of non-standard solutions. In the case of standard types of wagons and standard solutions, compliance with the recommended geometric dimensions and parameters of the vehicle should guarantee that even in extreme positions there will be no irregular contact between moving parts of the rail vehicle. This is especially important if it is necessary to place some elements or parts of the wagon’s equipment in the zone of wheelsets and in the zone of the connection between the bogies and the car body. This check can be carried out using graphic-analytical methods, according to the methodology given in the relevant EN standards, ORE reports, and AVV publications, and the limit values of the angular and translational coordinates of the moving parts. Verification of these calculations and verification of the derived state can be done by simulating these movements on the vehicle prototype itself or using a mock-up. This paper presents limit values and proof tests, for checking the mutual position of the running gear and the vehicle car body of a tank wagon car type Zacns. The test was performed using a transfer table for simulating the rotation of bogies relative to the car body in the horizontal plane and by using pads placed under wheels for simulating rotation in the vertical plane. The check was performed by visual inspection and by distance measurements.
PB  - Faculty of Mechanical and Civil Engineering in Kraljevo
C3  - XI INTERNATIONAL TRIENNIAL CONFERENCE HEAVY MACHINERY - HM2023, June 21- June 24, 2023.
T1  - Proof tests of geometric-kinematic calculations of railway vehicles
EP  - B.6
SP  - B.1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7284
ER  - 

@conference{
author = "Milković, Dragan and Simić, Goran and Lučanin, Vojkan and Radulović, Saša and Kostić Miličić, Aleksandra",
year = "2023",
abstract = "Geometric-kinematic calculations and experimental proof tests of the mutual position of assemblies and sub-assemblies of wagons that are in relative displacement are significant in developing new types of railway vehicles and especially in the application of non-standard solutions. In the case of standard types of wagons and standard solutions, compliance with the recommended geometric dimensions and parameters of the vehicle should guarantee that even in extreme positions there will be no irregular contact between moving parts of the rail vehicle. This is especially important if it is necessary to place some elements or parts of the wagon’s equipment in the zone of wheelsets and in the zone of the connection between the bogies and the car body. This check can be carried out using graphic-analytical methods, according to the methodology given in the relevant EN standards, ORE reports, and AVV publications, and the limit values of the angular and translational coordinates of the moving parts. Verification of these calculations and verification of the derived state can be done by simulating these movements on the vehicle prototype itself or using a mock-up. This paper presents limit values and proof tests, for checking the mutual position of the running gear and the vehicle car body of a tank wagon car type Zacns. The test was performed using a transfer table for simulating the rotation of bogies relative to the car body in the horizontal plane and by using pads placed under wheels for simulating rotation in the vertical plane. The check was performed by visual inspection and by distance measurements.",
publisher = "Faculty of Mechanical and Civil Engineering in Kraljevo",
journal = "XI INTERNATIONAL TRIENNIAL CONFERENCE HEAVY MACHINERY - HM2023, June 21- June 24, 2023.",
title = "Proof tests of geometric-kinematic calculations of railway vehicles",
pages = "B.6-B.1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7284"
}

Milković, D., Simić, G., Lučanin, V., Radulović, S.,& Kostić Miličić, A.. (2023). Proof tests of geometric-kinematic calculations of railway vehicles. in XI INTERNATIONAL TRIENNIAL CONFERENCE HEAVY MACHINERY - HM2023, June 21- June 24, 2023.
Faculty of Mechanical and Civil Engineering in Kraljevo., B.1-B.6.
https://hdl.handle.net/21.15107/rcub_machinery_7284

Milković D, Simić G, Lučanin V, Radulović S, Kostić Miličić A. Proof tests of geometric-kinematic calculations of railway vehicles. in XI INTERNATIONAL TRIENNIAL CONFERENCE HEAVY MACHINERY - HM2023, June 21- June 24, 2023.. 2023;:B.1-B.6.
https://hdl.handle.net/21.15107/rcub_machinery_7284 .

Milković, Dragan, Simić, Goran, Lučanin, Vojkan, Radulović, Saša, Kostić Miličić, Aleksandra, "Proof tests of geometric-kinematic calculations of railway vehicles" in XI INTERNATIONAL TRIENNIAL CONFERENCE HEAVY MACHINERY - HM2023, June 21- June 24, 2023. (2023):B.1-B.6,
https://hdl.handle.net/21.15107/rcub_machinery_7284 .

TY  - CONF
AU  - Milković, Dragan
AU  - Simić, Goran
AU  - Radulović, Saša
AU  - Lučanin, Vojkan
AU  - Kostić Miličić, Aleksandra
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7294
AB  - This paper explains the problem of more pronounced heating of the wheels and wear of the brake shoes of equally loaded railway vehicles with SS or S2 tread brakes compared to wagons with S0 or S1 brakes when they are in the same train composition. As the mass of the railway vehicle increases and the square of the speed increases, the energy that is converted into heat during braking increases. In the case of tread brakes, this heat is dissipated to a lesser extent through the shoes, and to a greater extent through the wheel. Due to the uneven temperature field, parts of the wheel expand differently, and thermal stresses arise in the wheel. During extreme braking, the thermal stresses in the circumferential part of the wheel can exceed the yield point of the material, and as a result, permanent deformations occur due to circumferential compression. After cooling, residual tensile stresses are created in the direction of the wheel circumference. In extreme cases, this can cause the wheels to crack. For this reason, it is necessary to limit the intensity of braking, especially during long-term partial braking due to speed regulation on railway down slopes. However, the maximum braking force must not be limited. This is achieved by introducing a variable load relay valve with kinked characteristics. The Kink valve is a relay valve of a special design, which, based on the level of loading of the wagon, maps the pressure in the brake cylinder, so that when braking from 80 to 100% of the maximum pressure at all loads, the braking force is proportional to the load, and during partial braking, in in the case of a load over 14.5 t/axle, the braking force is reduced, so that the wheels do not overheat during frequent partial braking.
PB  - University of Belgrade - Faculty of Mechanical Engineering
C3  - "International Conference of Experimental and Numerical investigations and New Technologies" CNN Tech, 04-07 July 2023
T1  - The role of relay valve with kinked characteristics in braking wagons with different brakes in a freight train
EP  - 43
SP  - 43
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7294
ER  - 

@conference{
author = "Milković, Dragan and Simić, Goran and Radulović, Saša and Lučanin, Vojkan and Kostić Miličić, Aleksandra",
year = "2023",
abstract = "This paper explains the problem of more pronounced heating of the wheels and wear of the brake shoes of equally loaded railway vehicles with SS or S2 tread brakes compared to wagons with S0 or S1 brakes when they are in the same train composition. As the mass of the railway vehicle increases and the square of the speed increases, the energy that is converted into heat during braking increases. In the case of tread brakes, this heat is dissipated to a lesser extent through the shoes, and to a greater extent through the wheel. Due to the uneven temperature field, parts of the wheel expand differently, and thermal stresses arise in the wheel. During extreme braking, the thermal stresses in the circumferential part of the wheel can exceed the yield point of the material, and as a result, permanent deformations occur due to circumferential compression. After cooling, residual tensile stresses are created in the direction of the wheel circumference. In extreme cases, this can cause the wheels to crack. For this reason, it is necessary to limit the intensity of braking, especially during long-term partial braking due to speed regulation on railway down slopes. However, the maximum braking force must not be limited. This is achieved by introducing a variable load relay valve with kinked characteristics. The Kink valve is a relay valve of a special design, which, based on the level of loading of the wagon, maps the pressure in the brake cylinder, so that when braking from 80 to 100% of the maximum pressure at all loads, the braking force is proportional to the load, and during partial braking, in in the case of a load over 14.5 t/axle, the braking force is reduced, so that the wheels do not overheat during frequent partial braking.",
publisher = "University of Belgrade - Faculty of Mechanical Engineering",
journal = ""International Conference of Experimental and Numerical investigations and New Technologies" CNN Tech, 04-07 July 2023",
title = "The role of relay valve with kinked characteristics in braking wagons with different brakes in a freight train",
pages = "43-43",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7294"
}

Milković, D., Simić, G., Radulović, S., Lučanin, V.,& Kostić Miličić, A.. (2023). The role of relay valve with kinked characteristics in braking wagons with different brakes in a freight train. in "International Conference of Experimental and Numerical investigations and New Technologies" CNN Tech, 04-07 July 2023
University of Belgrade - Faculty of Mechanical Engineering., 43-43.
https://hdl.handle.net/21.15107/rcub_machinery_7294

Milković D, Simić G, Radulović S, Lučanin V, Kostić Miličić A. The role of relay valve with kinked characteristics in braking wagons with different brakes in a freight train. in "International Conference of Experimental and Numerical investigations and New Technologies" CNN Tech, 04-07 July 2023. 2023;:43-43.
https://hdl.handle.net/21.15107/rcub_machinery_7294 .

Milković, Dragan, Simić, Goran, Radulović, Saša, Lučanin, Vojkan, Kostić Miličić, Aleksandra, "The role of relay valve with kinked characteristics in braking wagons with different brakes in a freight train" in "International Conference of Experimental and Numerical investigations and New Technologies" CNN Tech, 04-07 July 2023 (2023):43-43,
https://hdl.handle.net/21.15107/rcub_machinery_7294 .