Theoretical background for the bionic substantiation of parameters of the stubble cultivator working bodies

In the southern regions of Russia, the technology of cultivation of grain crops in the variant of partial sowing has been widely used. In this regard, it became necessary to create effective working bodies of a stubble cultivator that would have fundamentally new resource-saving ways of influencing the area under cultivating and meet the requirements of modern advanced technologies. The shapes of the working bodies surfaces of the cultivators were improved taking into account the mechanic-bionic approach. The main parameters of the toothed cutting surface were determined by the method of bionic comparisons, with a scarab beetle as a bionic prototype. Use of the serrated shape of the cutting edge is consistent with the bionic principle of multi-contact exposure and leads to the fact that the tops of the teeth become stress concentrators and, with a significantly smaller indentation force, cause soil destruction processes, which reduces the energy costs of cutting the soil layer. The optimal curvilinear shape of the working surface made in the form of a logarithmic spiral, is characterized by a constant value of the angle between the normal and the radius vector, and the value of this angle, equal to the angle of internal friction of the soil φ2, will ensure the sliding of the soil and plant residues with minimal energy consumption. The number (n = 4), height (h = 5...7 mm) and tooth placement step (S = 10...12 mm) of the bit tip of the stubble cultivator are analytically justified. The shape of the profile of the working surface of the stubble cultivator bit in the form of a logarithmic spiral with a variable angle of crumbling is proposed. The studies were conducted in the period from September to October 2018 in the soil channel of the research Laboratory of Bionic Agroengineering of the Department of Mechanization and Technical Service in Agro-Industrial Complex. They have shown the decrease in the traction resistance of the proposed working body of the stubble cultivator by 16.5% in comparison with the traction resistance of the serial sample.

soil loosening, biological prototype, scarab beetle, parameters, power, traction resistance

1. Shaporev A.N., Trubilin E.I. Obzor konstruktsiy seriynykh kul'tivatorov dlya sternevoy obrabotki pochvy. [Review of designs of serial cultivators for stubble tillage]. Nauchnoe obespechenie agropromyshlennogo kompleksa: sb. statey po materialam Kh Vseross. konf. molodykh uchenykh, posvyashch. 120-letiyu I. S. Kosenko. [Collection of articles on the materials of the 10th All-Russian Conference of young scientists devoted to the 120th anniversary of I. S. Kosenko]. 2017. pp. 654-655. (In Russ.). URL: https://elibrary.ru/item.asp?id=29131296.

2. Maslov G.G., Yudina E.M., Zhuriy I.A. Effektivnost’ poverkhnostnoy obrabotki pochvy sternevym mnogofunktsional’nym kul'tivatorom. [Efficiency of surface tillage with a multipurpose stubble cultivator]. Traktory i sel'khozmashiny. 2018;(3):7-11. (In Russ.).

3. Beketov V.G. Povyshenie urozhaynostiyarovoypshenitsy sprimeneniem resursosberegayushchey seyalki- kul'tivatora tochnogo vyseva. [Increase of spring wheat yield with the use of resource-saving seeder-cultivator of precise sowing]. Vestnik Altayskogo gosudarstvennogo agrarnogo universiteta. 2013;(5):122-125. (In Russ.). URL: https://elibrary.ru/item.asp?id=19012049.

4. Babitskiy L.F., Moskalevich V.Yu., Sobolevskiy I.V. Razvitie bionicheskogo napravleniya v zemledel'cheskoy mekhanike. [Development of bionic approach in agricultural mechanics]. Agrarnaya nauka Evro- Severo-Vostoka. 2017;(4):68-74. (In Russ.). URL: https://elibrary.ru/item.asp?id=29739684.

5. Pikmullin G.V., Bulgariev G.G. Metodika proektirovaniya formy rabochego organa kul'tivatora dlya predposevnoy obrabotki pochvy. [Methods of designing the form of the cultivator working body for the secondary tillage]. Vestnik Kazanskogo gosudarstvennogo agrarnogo universiteta. 2011;6(1):107-109. (In Russ.). URL: https://elibrary.ru/item.asp?id=15618929.

6. Babitskiy L.F., Sobolevskiy I.V., Yalanuzyan A.A. Obosnovanie parametrov sternevogo kul’tivatora po bionicheskomupodobiyu. [Substantiation of the parameters of the stubble cultivator in bionic similarity]. Dni nauki krymskogo federal'nogo universiteta im. V.I. Vernadskogo: sb. tr. III nauchnoy konf. professorsko-prepodava- tel'skogo sostava, aspirantov, studentov i molodykh uchenykh. [Proceedings of the 3d scientific Conference of the teaching staff, graduate students and young scientists "Days of science of the Crimean Federal University. V. I. Vernadsky"]. Simferopol': KrymskiyFU, 2018. pp. 117-119. (In Russ.). URL: https://elibrary.ru/item.asp?id=32599667.

7. Jianqiao L., Yunpeng Y., Benard C., Xuejiao W., Zhaoliang W., Meng Z. Bionic Design for Reducing Ad-hesive Resistance of the Ridger Inspired by a Boar’s Head. Applied Bionics and Biomechanics. 2017. Article ID 8315972, 10 p. 2017. DOI: https://doi.org/10.1155/2017/8315972.

8. Liu R., Yao J.H., Zhang Q.L., Collier R. Sliding wear and solid-particle erosion resistance of a novel high- tungsten Stellite alloy. Wear. 322-323 (2015) 41-50.

9. Slobodyan S.M., Romanishin A.E., Romanishina S.A. Skol'zhenie pochvy po rezhushchemu elementu rabochego organa. [Sliding of soil along the cutting element of the working body]. Vestnik Altayskogo gosudarstvennogo agrarnogo universiteta. 2014;(7):146-153. (In Russ.). URL: https://elibrary.ru/item.asp?id=21812965.

10. Syromyatnikov Yu.N. Povyshenie effektivnosti tekhnologicheskogo protsessa dvizheniya pochvy po lemekhu pochvoobrabatyvayushchey rykhlitel’no-separiruyushchey mashiny. [Improving the efficiency of the tech-nological process of soil movement along the ploughshare of the tillage loosening-separating machine]. Sel'skoe khozyaystvo. 2017;(1):48-55. (In Russ.). URL: https://elibrary.ru/item.asp?id=28880486.

11. Chirende B, Li J Q, Wen L G, et al. Effects of bionic non-smooth surface on reducing soil resistance to disc ploughing. Sci China Tech Sci. 2010(53): 2960-2965. DOI: 10.1007/s11431-010-4128-8.

12. Shovkoplyas A.V. Teoreticheskoe obosnovanie formy rabochego organa. [Theoretical substantiation of the shape of the working body]. Innovatsii v sel'skom khozyaystve. 2015;(4):90-96. (In Russ.). URL: https://elibra- ry.m/item.asp?id=25379969.

13. Babitskiy L.F., Sobolevskiy I.V., Yalanuzyan A.A. Rabochiy organ sternevogo kul'tivatora. [The working body of the stubble cultivator]. Patent RF, № 173203, 2017. (In Russ.). URL: http://www1.fips.ru/fips_servl/fips_ servlet?DB=RUPM&rn= 1872&DocNumber=173203&TypeFile=html.

14. Sravnitel'nye ispytaniya sel'skokhozyaystvennoy tekhniki: nauch. izdanie. [Comparative tests of agricultural machinery: scientific. edition]. Pod obshch. red. V.M. Pronina. Moscow: FGBNU«Rosinformagrotekh», 2013. 416 p.