4_2021_sen_4

Title of the article COMPARATIVE ANALYSIS OF VIBRATION CHARACTERISTICS OF UNDERGROUND SUPPORT BLOCKS UNDER DYNAMIC AND CYCLIC LOADING
Authors

KOMISSAROV Viktor V., Ph. D. in Eng., Deputy Head of the Test Center for Railway Transport, Belarusian State University of Transport, Gomel, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

LAPUSHKIN Artem S., Senior Lecturer of the Department “Design, Construction and Operation of Transport Facilities”, Belarusian State University of Transport, Gomel, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section DYNAMICS, DURABILITY OF VEHICLES AND STRUCTURES
Year 2021
Issue 4(57)
Pages 33–40
Type of article RAR
Index UDK 625.421:620.1.051
DOI https://doi.org/10.46864/1995-0470-2021-4-57-33-40
Abstract The object of research is various designs of support blocks with intermediate fasteners for underground areas of both domestic and foreign production. An integrated approach to testing block track structures is proposed and implemented: modeling of cyclic loading typical for the entire track structure, as well as shock loading typical for intermediate butt rail fastenings. The test frequency is set to 10 Hz under cyclic loading. A method is presented for improving the testing equipment in the framework of modeling the transfer of loads from the wheel to the rail in the plane of contact between the rolling surfaces of the wheel and the rail. The main results of the tests are presented. Under dynamic loading, the maximum forces in the rail arise in a structure with a conventional pad (of the order of 50–55 kN), a more complex spectrum of force variation with a maximum amplitude of about 20–25 kN and a span of 30–40 kN is characteristic of the Metro wooden block. The lowest values of vibration accelerations in the implementation of this approach are shown by the LVT block. Structures with a vibration isolating pad have the highest vibration acceleration values in the frequency range from 10 to 31.5 (40) Hz. In the zone of higher frequencies, the investigated structures have comparable values of vibration accelerations. The analysis of vibration characteristics is carried out on the basis of the recorded values of vibration accelerations in characteristic measuring points. The values of vibration accelerations and their relative comparison are given depending on the installation position of the measuring channels and on the type of construction. It is noted that in the 10 Hz zone the values of vibration accelerations are minimal when using a vibration isolating pad with a hardness of 65 Shore A. Comparative results for frequencies of 31,5 and 63 Hz are presented. It is recommended for the design options that showed the best results to conduct operational tests in underground conditions.
Keywords support blocks, railway track, underground, elastic elements, rolling stock, axial load, frequency, test equipment, vibration acceleration, vertical forces
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Bibliography
  1. Bochkarev D.I., Kebikov A.A., Miroshnikov N.E., Polishchuk V.P., Kazak P.M. Sovremennoe sostoyanie i perspektivy razvitiya konstruktsiy puti dlya metropolitena [Modern level and future trends of metro railway constructions]. Mechanics of machines, mechanisms and materials, 2012, no. 2(19), pp. 94–99 (in Russ.).
  2. Instruktsiya po tekushchemu soderzhaniyu puti i kontaktnogo relsa Minskogo metropolitena [Instructions for the current maintenance of the track and the contact rail of the Minsk Metro]. Minsk, 2019. 196 p. (in Russ.).
  3. Shakhunyants G.M. Zheleznodorozhnyy put [Railway track]. Moscow, Transport Publ., 1987. 479 p. (in Russ.).
  4. Instruktsiya po ekspluatatsii puti s promezhutochnym skrepleniem Vossloh i soderzhaniyu kontaktnogo relsa na betonnykh blokakh v minskom metropolitene [Instructions for track operation with Vossloh intermediate fastening and for maintenance of the contact rail on concrete blocks in the Minsk Metro]. Minsk, 2020. 57 p. (in Russ.).
  5. Instruktsiya po ekspluatatsii puti s promezhutochnym skrepleniem Vossloh W21, UTS300 i soderzhaniyu kontaktnogo relsa na betonnykh blokakh v minskom metropolitene [Instructions for the operation of the track with intermediate fastening Vossloh W21, UTS300 and the maintenance of the contact rail on concrete blocks in the Minsk metro]. Minsk, 2020. 57 p. (in Russ.).
  6. Kouroussis G., Mouzakis H.P., Vogiatzis K.E. Structural impact response for assessing railway vibration induced on buildings. Mechanics and industry, 2017, vol. 18, no. 8 Supplement. DOI: https://doi.org/10.1051/meca/2017043.
  7. CT-38. Guidelines for noise and vibrations. Metro rail transit system. Ministry of Railways, India, 2015.
  8. Vogiatzis K.E. Athens Metro extension project to Piraeus ground borne noise and vibration assessment and control. International journal of mechanics, 2012, vol. 6, iss. 2, pp. 130–139.
  9. Cao Z., Guo T., Zhang Z. Vibration measurement in a metro depot with trains running in the top story. Journal of vibroengineering, 2017, vol. 19, iss. 1, pp. 502–519. DOI: https://doi.
    org/10.21595/jve.2016.17304.
  10. State Standard R 59428-2021. Skreplenie relsovoe promezhutochnoe zheleznodorozhnogo puti. Obshchie tekhnicheskie usloviya [Intermediate rail fastening of railway track. General specifications]. Moscow, Standartinform Publ., 2021. 28 p. (in Russ.).
  11. State Standard R 55050. Zheleznodorozhnyy podvizhnoy sostav. Normy dopustimogo vozdeystviya na zheleznodorozhnyy put i metody ispytaniy [Railway rolling stock. Permissible exposure norms to the railway track and test methods]. Moscow, Standartinform Publ., 2013, 2019. 25 p. (in Russ.).