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2017, N 2 (28) |
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PROCESSES AND MACHINES OF AGROENGINEERING SYSTEMS
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Berezhnov N., Syrbakov A. |
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Evaluation of traction and energy indicators of a cultivation and sowing machine-tractor aggregate by means of control dynanometry |
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In order to determine energy characteristics and to elaborate scientifically grounded recommendations on the rational coupling of a cultivation and sowing unit PK-12.2 “Kuzbass-T”, its control dynamometry as a part of a machine-tractor aggregate (MTA) has been performed. The article describes the results of field tests of the aggregate Case IH Stieger STX-435 + PK-12.2 “Kuzbass-T” in the conditions of the owner-operated farm “Kupriianov A.A.”, in Tisul district of Kemerovo region. During the tests, there were measured the draft resistance of the agricultural machine, operating movement speed, the skidding of drive wheels of the tractor as well as their statistical characteristics. An average draft resistance of the aggregate amounted to 61.18 kN at an average moving speed 2.60 m/s (9.34 km/h). An average skidding value of tractor drive wheels did not exceed 10.9%, which corresponds with agrotechnical requirements on this factor within the speed range recommended by agricultural technology (8-13 km/h). An average draft resistance of the unit tanker when moving through the cultivated field amounted to 4.79 kN which is 21.3% (1.02 kN) higher than an analogous value (3.77 kN) of the tests in the harvested field. Calculated average rolling resistance factors of tanker wheels amounted to the following: 0.082 in the harvested field, and 0.105 in the cultivated field. Reduced (to V0=1.39 m/s) values of draft resistance equaled to the following: 3.12 kN/m for the cultivation and sowing unit, and 3.43 kN/m for the aggregate in general. The proportionality factors equaled to 0.095 and 0.105 s2/m2 correspondingly. The variation of draft resistance of the aggregate amounted to 9.01%, and of the sowing unit – to 9.6%. The difference between growth factors of draft resistance as well as its variations can be explained by a partial sway stabilization of draft resistance of the aggregate due to the rolling resistance of the bunker.
Keywords: TRACTOR, SOWING UNIT, DYNAMOMETRY, MACHINE-TRACTOR AGGREGATE, DRAFT RESISTANCE, SKIDDING, FIELD TESTS, SENSOR, VARIATION, MATHEMATICAL EXPECTATION |