Investigation of technological properties of wide span tractors for controlled traffic farming

Abstract

Abstract. Practical use of wide span tractors (vehicles) for controlled traffic farming needs further motivation of the principles of their automatic steering, allowing maximum reduction of area losses of the field under the engineering zone at least 1.5 times. The use of contemporary wide span tractors (vehicles) with a track width more than 7.5 m allows reaching a value of the area losses of the field under the engineering zone not more than 5…6 %, which is quite acceptable. The presented brands of such tractors are provided with various technological equipment and means of automation, the technological significance of which can be estimated only by means of objective assessment methods. The developed equation for the estimation of the potential efficiency of the wide span tractors makes it possible to conduct analysis of the degree of impact upon them made by their design parameters and indicators of technical characteristics. Estimation of the degree of potential efficiency, which the contemporary wide span tractors should have, showed that the result exceeds the potential efficiency of the conventional machine and tractor aggregates by 1.5-2 times.

Studying the conditions of assembling traction-drive soil-processing aggregates with tractors of traction-energy concept

“…Solving the tasks of the second approach, ¿ rst of all, one should analytically estimate the ranges of minimally required exploitation weight of the tractor G min ,… ,G max and the ef¿ cient power N ɟ min ,...,N ɟ max of its engine in the determined range of agrotechnically possible velocities V min ,…,V max of the aggregate movement, in which the conditions of the system of equations will be true (20).…”

“…Solving the tasks of the third approach comes down to the analytical determination of such rational velocity V of the movement of the machine-tractor aggregate, for which the conditions of the presented system of equations will also be true (20).…”

“…Relative traction resistance of the plough (k 0 ), (20) on PC in Mathcad environment allowed obtaining the following results: ¿ rst and foremost, the rational parameters of the width of span of the aggregate ȼ un = 4 m and the movement velocity V = 4.81 kmÂ(h) -1 . Also, we determined graphic dependences of useful power N a , tractive power N pl and power, required for the work of the aggregate N un on the movement velocity of the aggregate in the composition of rotational ploughs PR-4, PR-2.7 and PR-2, the width of span ȼ un of which is 4, 3, and 1.8 m (Fig.…”

“…But the mentioned references consider the issues of assembling soil-processing aggregates with traction and drive working units based on energy-saturated tractors of traction-energy concept in a trivial and shallow way. Compared to the main provisions of theoretical and experimental studies of traction-drive combined soil-processing machines, stipulated in [13,[19][20][21], the method of their assessment and aggregating is very averaged.…”

Theoretical Study of Transverse Offsets of Wide Span Tractor Working Implements and Their Influence on Damage to Row Crops

“…With CTF, tractor wheels do not come into contact with the cultivation area, but increasingly compact the traffic-lanes, thus improving draught efficiency [8][9][10][11]. Wide span tractors are usually used in CTF because of their undeniable advantages over traditional tractors and machine-and-tractor aggregates [12][13][14][15]. This type of tractor can be used in operations from sowing to crop management (mechanical weeding, fertilization and so on); it has a wide transversal bar, on which different working implements can be mounted, while the supporting wheels follow the set traffic-lanes [16,17].…”