Vibrations in engineering and technology

Bulgakov Volodymyr – Academician of NAAS, Doctor of Technical Sciences, Professor, Head of the Department of Mechanics of the National University of Life and Environmental Sciences of Ukraine, (15, Heroyiv Oborony Str., Kyiv, 03041, e-mail: vbulgakov@meta.ua)

Kuvachov Volodymyr – Doctor of Technical Sciences, Associate Professor, Head of the Department of Machine Use in Agriculture of the Dmytro Motornyi Tavria State Agrotechnological University (18, Khmelnitsky Ave., Zaporozhye Region, Melitopol,72312; e-mail: kuvachoff @ ukr.net)

Solona Olena – Candidate of Technical Sciences, (Ph. D in Engeneering), Associate Professor, Head of the Department of General Technical Disciplines and Occupational Safety, Vinnytsia National Agrarian University (3, Sonyachna Str., Vinnytsia, 21008, e-mail: solona_o_v@ukr.net)

Boris Mykola – Candidate of Technical Sciences, (Ph. D in Engeneering), Associate Professor of the Department of Agroengineering and Systems Engineering of State Agrarian and Engineering University in Podilia (13, Shevchenko Str., Khmelnitsky region, Kamenets-Podolsky, 32316, e-mail: mvapk@pdatu.edu.ua)

Smoothness of movement of agricultural units is one of the important operational indicators of their work which is estimated on influence of fluctuations (translational vertical, cross, angular longitudinal, etc.) The article presents the method and results of experimental assessment of the smoothness of the movement of the bridge agricultural unit, which moves in the footsteps of a constant technological track. Studies of the smoothness of the bridge unit showed that the graphs of normalized correlation functions of vertical oscillations of the bridge agricultural tool developed by us in its motion in the wake of a constant technological track is characterized by a function containing along with random components harmonic, which are expressed by attenuating periodic oscillations. The frequency spectrum of oscillations of the agricultural tool core is concentrated in the range from 0 to 20 s–1, which agrees with the frequency range 0…0.3 cm−1 in which the variances of oscillations of the irregularities of the profile of the traces of the technological track are concentrated. The length of the correlation connection  is approximately 0.25 s, which is equal to 0.25 m at the speed of the agricultural tool within 1.0 m / s.The obtained result is explained by the fact that the main spectrum of oscillations of the profile irregularities has a periodicity that corresponds to the step of ground engagement of the tires of the wheels of the agricultural tool.

The research confirmed the effectiveness of the method of estimating the intensity of vertical oscillations of an agricultural unit by a measuring and registration complex based on a tablet computer with Android operating system with built-in accelerometer sensors and Accelerometer Meter application.

1. Volodymyr K., Serhii K., Tomasz N., Tetiana C., Vasyl M., Yevhen I., Szymon G., Taras H., Sergii S., Oleksandr D.  (2021).Scientific bases of increase movement smoothness of the machine-tractor units on base of modular power means. Monograph – Warszawa. 136 p. URL: http://www.tsatu.edu.ua/mvz/naukova-dijalnist/statti-vykladachiv. 

2. Kut'kov G.M.  (2015). Traktory i avtomobili: teoriya i tekhnologicheskie svojstva: uchebnik. Moskva: NIC INFRA,  506 s.

3. GOST ISO 10326-1. (2002). Vibraciya. Ocenka vibracii sidenij transportnyh sredstv po rezul'tatam laboratornyh ispytanij. Moskva: Izd. standartov.  8 s. 

4. GOST 12.4.012-75. (1975).Sistema standartov bezopasnosti truda (CCBT). Vibraciya. Sredstva izmereniya i kontrolya vibracii na robochih mestah. Tekhnicheskie trebovaniya. Moskva: Izd. standartov. 5 s. 

5. GOST 12.4.025-76. (1976).Sistema standartov bezopasnosti truda. Vibraciya. Metody rascheta vibroizolyacii rabochego mesta operatorov samohodnyh mashin. Osnovnye polozhennya. M.: Izd. Standartov. 57 s. 

6. Otraslevaya normal' avtomobilestroeniya ON 25332-69. (1976). Avtomobil'nyj podvizhnoj sostav. Plavnost' hoda. Metody ispytanij. M.: Izd. standartov. 57 s.

7. OST 37.001.291-84. (1984). Avtotransportnye sredstva. Tekhnicheskie normy plavnosti hoda. Moskva.: Izd. standartov. 8 s. 

8. DSTU EN ISO 5349-1. (2005). Vіbracіya mekhanіchna. Vimіryuvannya ta ocіnyuvannya vplivu na lyudinu vіbracії. CHastina 1: Zagal'nі vimogi (EN ISO 5349-1:2001, IDT). 

9. DSTU EN ISO 5349-1.(2005). Vіbracіya mekhanіchna. Vimіryuvannya ta ocіnyuvannya vplivu na lyudinu vіbracії. CHastina 2: Praktichna nastanova z vimіryuvannya na robochomu mіscі. (EN ISO 5349-1:2001, IDT). 

10. ISO 10056 (2001). Mechanical vibration – Measurement and analysis of whole – body vibration to which passengers and crew are exposed in vehicles. 

11. EN 1032 (2003). Mechanical vibration – Testing of mobile machinery in order to determine the vibration emission value.

12. Avtotransportnye sredstva. Metody ispytanij na plavnost' hoda : OST 37.001.275. Moskva : NAMI, 1985. 12 s.

13. Bulgakov V., Olt J., Kuvachov V. et al. A theoretical and experimental study of the traction properties of agricultural gantry systems. Agraarteadus: Journal of Agricultural Science. 2020. № XXXI (1). Р. 10–16. URL: http://www.tsatu.edu.ua/mvz/naukova-dijalnist/statti-vykladachiv.

14. Nadikto V.T. (2017). Osnovi naukovih doslіdzhen': pіdruchnik. Herson: OLDІ–PLYUS, 268 s.

15. Bulgakov V., Adamchuk V., Kuvachov V. (2017). Study into movement of wide span tractors (vehicles) used in controlled traffic farming. Proceedings 28th DAAAM International Symposium «Intelligent Manufacturing And Automation» (08 – 11th November 2017, Zadar, Croatia) / DAAAM International. Vienna, Austria, 2017. P. 0199–0208. URL: http://www.tsatu.edu.ua/mvz/naukova-dijalnist/statti-vykladachiv.

16. ZHil'cov O.B.(2015). Teorіya jmovіrnostej ta matematichna statistika u prikladah і zadachah: navch. posіb. Kiїv: Unіversitet іm. B. Grіnchenka,  336 s.