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xxx V. Bulgakov, J. Olt, V. Nadykto, V. Volskiy, S. Polishchuk, A. Aboltins and H. Beloev
Theoretical research into directional stability of trailed tandem- type disk harrow
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Theoretical research into directional stability of trailed tandem- type disk harrow

V. Bulgakov¹, J. Olt², V. Nadykto³, V. Volskiy⁴, S. Polishchuk⁵, A. Aboltins⁶ and H. Beloev⁷

¹National University of Life and Environmental Sciences of Ukraine,15 Heroyiv Oborony Str., UA 03041 Kyiv, Ukraine
²Estonian University of Life Sciences, Institute of Technology, 56 Kreutzwaldi Str., EE 51006 Tartu, Estonia
³Dmytro Motornyi Tavria State Agrotechnological University, 18B Khmelnytsky Ave, UA 72310 Melitopol, Zaporozhye Region, Ukraine
⁴National Scientific Centre, Institute for Agricultural Engineering and Electrification, 11 Vokzalna Str., Glevakcha 1, Vasylkiv District, UA 08631 Kyiv Region, Ukraine
⁵National Scientific Centre, Institute of Agriculture of NAAS of Ukraine, 2b, Mashinobudivnikiv Str., Chabany vil., Kyiv-Svyatoshin Dist., UA 08162, Kyiv Region, Ukraine
⁶Latvia University of Life Sciences and Technologies, Cakstes Blvd. 5, LV 3001 Jelgava, Latvia
⁷University of Ruse “Angel Kanchev”, 5, Studentska Str., BG 7017, Ruse, Bulgaria
*Correspondence: jyri.olt@emu.ee


Disking is one of the methods of soil cultivation, provides its effective crumbling, loosening, partial mixing and soil inversion. This ensures that crop residues on the soil surface are shredded and intermixing with loosened soil particles. Since, in addition to crop stubble, weeds are also counted as crop residues, soil disking, along with the use of herbicides, is often regarded as the most effective method of controlling the weediness of the agricultural background. Despite the fact that numerous studies on the disk harrow working process are available, insufficient attention has been paid to the study of the stability of harrowmachine-tractor units, especially trailed ones. The purpose of this study is to establish the theoretical patterns that would provide for selecting the trailed disk harrow parameters that ensure the desired directional stability of the implement, which, in its turn, helps to achieve the desired qualitative performance of the disk harrowing machine-tractor unit. The principles of the theory agricultural machine, analytical mechanics, higher mathematics, as well as methods of PC-assisted numerical calculations have been used. According to the results of the study, it has been established that sufficient directional stability of the trailed disk harrow can be ensured if its working width B, the distance from the hitch point to the centre of resistance (parameter d) and the operating speed 𝑉𝑜 are properly selected. Determining the above-mentioned parameters of the disk harrow with the use of the obtained new analytical relations ensures achieving just their optimal combination, which provides for the maximum field productivity of the harrowmachine-tractor unit with the satisfactory stability of disk harrow movement in the horizontal plane.

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