Experimental Determination of Dynamic Loading in a Drive Chain with Transverse Vibrations as a String with Fixed Ends

Chain transmissions are widely used in drives of hoisting-and-transport and ag-ricultural machines, as well as in a number of machine tools and technological equipment in various branches of industry. However, a significant disadvantage of these transmissions is the high vibration activity under high dynamic loading. In this regard, the study of dynamic loads that occur during chain vibrations and affect the operability of the machine drive is one of the essential tasks of its dynamics. The article presents experimental studies performed in order to determine the maximum dynamic loads in a chain transmission of a machine drive with transverse vibrations of the chain. The most common case of transverse vibrations of a chain loop is studied as a string with fixed ends. This type of vibration is typical of chain transmissions with large masses of sprockets and parts attached to them. The article presents a description of an original test bench with an automated system for collecting and processing experimental data and a test procedure. The obtained experimental data are presented in the form of tables and graphical dependences of the maximum dynamic loads on the tension force of the chain average per cycle of vibrations and the amplitude of its transverse vibrations in the center of the span, related to its length. As a result of approximation of the experimental data array, an empirical formula is proposed that can be used in dynamic calculations of the drive. It is established that the maximum dynamic load and its amplitude increases with the increase of the ratio of the amplitude of transverse vibrations of the chain in the middle of its span to its length and the initial tension force of the chain. The ratio of the dynamic load amplitude to the tension force of the chain decreases with the increase of the latter.

References

[1] Gotovtsev A.A., Kotenok I.P. Proyektirovaniye tsepnykh peredach [Design of chain drives]. Moscow, Mashinostroyeniye publ., 1982. 336 p.

[2] Reshetov D.N., Levina Z.M., Kaminskaya V.V., Kotlyarenko L.B. Tablichnyye raschety detaley stankov. Vyp. 2. Raschety tsepnykh peredach, chervyachnykh peredach i muft [Tabular calculations of machine parts. Vol. 2. Calculations of chain gears, worm gears and clutches]. Moscow, Mashgiz publ., 1953. 212 p.

[3] Golovnin G.Ya. Dinamika kanatov i tsepey [Dynamics of ropes and chains]. Kharkov, Metallurgizdat publ., 1962. 124 p.

[4] Pilipenko O.I., Poluyan A.V. Algorithm of calculation and selection of optimal parameters of multimass chain transmission. Technical sciences and technology, 2016, no. 2(4), pp. 9–15 (in Russ.).

[5] Mevsha N.V., Puntus A.V. Experimental determination of loads operating in roller chain drives. Novyye materialy i tekhnologii v mashinostroyenii, 2016, no. 24, pp. 34–37 (in Russ.).

[6] Alekseyev V.I., Palochkin S.V. Energy dissipation of torsional vibrations in chain drives of machine drives. Sovremennyye problemy teorii mashin, 2017, no. 5, pp. 49–53 (in Russ.).

[7] Palochkin S.V., Alekseyev V.I. Scattering of energy of small transverse vi-brations of branch of chain transmission on contact deformations in chain hinges. Technologies & quality, 2018, no. 2(40), pp. 23–27 (in Russ.).

[8] Alekseyev V.I., Palochkin S.V. Damping of longitudinal vibrations of drive chain gears due to contact deformations in the joints of their chains. Mashinostroyeniye: innovatsionnyye aspekty razvitiya. Mat. I mezhdunar. nauch.-prakt. konf. [Mechanical engineering: innovative aspects of development materials of the I international scientific and practical conference]. Sankt-Petersburg, 2018, no. 1, pp. 8–11.

[9] Dzhomartov A.A., Tuleshov A.K., Kaimov A.T. Simulation of chain transmission dynamics on the Simulationx software package. Problemy mekhaniki sovremennykh mashin. Mater. VII mezhdunar. nauch. konf. [Problems of mechanics of modern machines proceedings of the vii international scientific conference]. Ulan-Ude, 2018, pp. 130–139.

[10] Mevsha N.V., Puntus A.V. Equipment to study the dynamics of chain drives. Privody i komponenty mashin, 2019, no. 1–2(31), pp. 17–19 (in Russ.).

[11] Datchik sily UU-K500 [Universal Load Cell. Model UU]. Available at: http://dacell.com/attach/dacell/20181101/1851d25d8e242af2e61478f6c35b495e.pdf (accessed 28 January 2019).

[12] Analizator spektra ZET017-T8. Tenzostantsiya. Rukovodstvo po ekspluatatsii. ZTMS.411168.004 R•E [Spectrum analyzer ZET 017-T8. Strain station. User manual. STMS.411168.004 re]. Available at: https://zetlab.com/shop/izmeritelnoe-oborudovanie/tezostantsii/tenzostaniya-zet-017-t8/ (accessed 19 February 2019).

[13] Programmnoye obespecheniye ZETLAB [ZETLAB software]. Available at: https://zetlab.com/podderzhka /programmnoe-obespechenie-podderzhka/ (accessed 19 February 2019).

[14] GOST 134568–97. Tsepi privodnyye rolikovyye i vtulochnyye. Ob-shchetekhnicheskiye usloviya [State Standard 134568–97. Driving roller and bush chains. General specifications]. Minsk, Standartinform publ., 2003. 23 p.

[15] Porshnev S.V. MATLAB 7. Osnovy raboty i programmirovaniya [MATLAB 7. Basics of work and programming]. Moscow, Binom-Press publ., 2006. 20 p.