INVESTIGATION OF THE GEOMETRIC PARAMETERS OF THE BRAKE PADS OF FREIGHT CARS UNDER HAZARDOUS WEAR
DOI:
https://doi.org/10.15802/stp2020/199515Keywords:
brake shoe, car, brake beam, abnormal wear, method, analysis, geometric parameters, wear, wheel, gapAbstract
Purpose. This study aims to determine the geometric parameters of the brake pads of freight cars under hazardous wear. Methodology. A set of operational and theoretical studies concerning the occurrence of hazardous wear, which changes the geometric parameters of the useful contact area of the brake pads of freight cars at different established gaps between the pad and the wheel, which significantly impairs the effectiveness of train braking. Using the collected statistical material, computer mathematical modeling of the upper hazardous wear at different gaps was performed and the negative factors affecting the brake system were identified. MathCAD and AutoCAD software was used. Findings. As a result of inspections of the mechanical part of the brakes, attention was paid to the abnormal wear of the brake pads of the freight cars, which is formed by the fact that the common gravity center of the pad and the shoe, placed on the pendular suspension, do not coincide with the center of the hole in brake beam king post with any pads. In order to investigate possible causes of abnormal wear of the brake pads, their real images and theoretical schemes are given, which allow to establish the causes of the formation of abnormal wear of the pads at different gaps between the pad and the wheel and to determine their change of geometrical parameters that affect the useful contact area. When comparing the results of calculations according to the coordinate method performed in the MathCAD software environment and the graphic method (in AutoCAD), for determining the geometric parameters of the formation of the upper hazardous pad wear, depending on the regulatory pad wear between the wheel and the brake pad, it is theoretically proved that the error between them does not exceed 5–7%. Originality. For the first time, the principles of the methodology for determining the geometric parameters of the useful contact area of the pads with the formation of upper hazardous wear, depending on the gap between the wheel and the brake shoe, were formulated using coordinate and graphical methods. Practical value. It is advisable to apply the results of the research obtained in the work in the design and technological departments and bureaus when designing both mechanical brake systems for the undercarriage of innovative cars and for improvement of the cars currently operated at the railways.
References
Analiz stanu bezpeky rukhu pojizdiv na zaliznycjakh Ukrajiny za 2017 rik. (2017). Gholovne upravlinnja vaghonnogho ghospodarstva. Kyiv. (іn Ukrainian)
Blokhin, Y. P., Alpysbaev, K. T., & Panasenko, V. Y. (2012). Telezhki ZK1 poluvagonov, postroennykh v KNR. Vagonnyiy park, 9(66), 12-14. (in Russian)
Vlasova, A. M. (2017). Matematika s MathCad. Ekaterinburg: UrFU. (in Russian)
Instruktsiia z ekspluatatsii halm rukhomoho skladu na zaliznytsiakh Ukrainy: TsT-TsV-TsL-0015, No. 264-Ts. (2004). Kyiv. (іn Ukrainian)
Instrukcija z remontu ghaljmivnogho obladnannja. CV-CL-CT-0013 No. 160. (2005). Kyiv. (In Ukrainian)
Koptovec, A. N., Shirin, L. N., Shlyahov, E. M., Denishchenko, A. V., Zil, V. V., & Yavorskaya, V. V. (2017). Modelirovanie rabochih processov treniya v kolodochnom kolesnom tormoze shahtnyh lokomotivov: Monografiya. Dnipro: Gosudarstvennoe vysshee uchebnoe zavedenie «Natsionalnyy gornyy universitet» (in Russian)
Muradyan, L. A., Shaposhnik, V. Yu., & Vinstrot, B. U. (2015). Ispyitaniya perspektivnyih tormoznyih kolodok na zheleznyih dorogah Ukrainyi. Lokomotiv-inform. №7-8. 20-22. (in Russian)
Pavlyukov, A. E., Cherepov, O. V., Shalupina, I. P. (2017). Brake shoe of freight wagon: analysis of damage and factors affecting the brake power. Herald of the Ural State University of Railway Transport, (4), 4-11. DOI: https://doi.org/10.20291/2079-0392-2017-4-4-11 (in Russian)
Ravlyuk, V. G., & Nechvoloda, S. I. (2017). UA Patent № 121889 Ukrainskyi instytut intelektualnoi vlasnosti (Ukrpatent)
Ravlyuk, V. G. (2019). Definition of the dual wear features of the brake shoes of freight cars. Zbirnyk naukovykh prats USURT, 183, 46-59. (in Ukrainian)
Ravlyuk, V. G. (2019). Investigation of features of dual wear of pads in brake system of freight cars. Science and Transport Progress, 2(80), 111-126. DOI: https://doi.org/10.15802/stp2019/166114 (іn Ukrainian)
Ravlyuk, V. G. (2019). The modernization of the elements of the brake lever transmission of freight cars bogies. Science and Transport Progress, 5(83), 108-121. DOI: https://doi.org/10.15802/stp2019/182013 (іn Ukrainian)
Shpachuk, V. P., Pushnja, V. O., Rubanenko, O. I., & Gharbuz, A. O. (2016). Konspekt lekcij z dyscypliny «Teoretychna mekhanika. Dynamika». Kharkiv: O. M. Beketov National University of Urban Economy. (in Ukrainian)
Ambikaprasad, O. Chaubey, & Abhijeet, A. Raut. (2015). Failure Analysis of Brake Shoe in Indian Railway Wagon. IPASJ International Journal of Mechanical Engineering. 3(12) 37-41. (in English)
Bird, J. (2019). Science and Mathematics for Engineering. 6th Edition. Routledge. (in English)
Gupta, V., Saini, K., Garg, A. K., Krishan, G. & Parkash, O. (2016). Comparative Analysis of Disc Brake Model for Different Materials Investigated Under Tragic Situations. Asian Review of Mechanical Engineering 5(1), 18-23. (in English)
Ravlyuk, V., Ravliuk, M., Hrebeniuk, V., & Bondarenko, V. (2019). Research of the calculation scheme for the brake lever transmission and construction of the load model for the brake pads of freight cars. IOP Conference Series: Materials Science and Engineering, 708, 1-8. DOI: https://doi.org/10.1088/1757-899X/708/1/012026 (in English)
Sarip, S. (2013). Design Development of Lightweight Disc Brake for Regenerative Braking – Finite Element Analysis. International Journal of Applied Physics and Mathematics. 3(1), 52-58. DOI: https://doi.org/10.7763/IJAPM.2013.V3.173 (in English)
Sharma, R. C., Dhingra, M., & Pathak, R. K. (2015). Braking systems in railway vehicles. International Journal of Engineering Research & Technology (IJERT), 4(01), 206-211. (in English)
Vakkalagadda, M. R. K., Srivastava, D. K., Mishra, A., & Racherla, V. (2015). Performance analyses of brake blocks used by Indian Railways. Original Research Article, 328-329, 64-76. DOI: https://doi.org/10.1016/j.wear.2015.01.044 (in English)
Vineesh, K. P., Vakkalagadda, M. R. K., Tripathi, A. K., Mishra, A., Racherla, V. (2016). Non-uniformity in braking in coaching and freight stock in Indian Railways and associated causes. Engineering Failure Analysis, 59, 493-508. DOI: https://doi.org/10.1016/j.engfailanal.2015.11.023 (in English)
Zhang, Y., & Zhang, M. (2018). The application status of unit brakes on metro vehicles in China. IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE), 3(15), 17-23. DOI: https://doi.org/10.9790/1684-1503031723 (in English)
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