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260 Iona Ţenu et al. 3.2. Tests under Laboratory Conditions Regarding the Wheel-soil Interaction Respecting the laws of similarity, a 5.00-12/4PR TA60 tread traction tyre wheel, mounted on the the laboratory rig carriage, was tested in laboratory conditions. In these tests, the tyre wheel performed as a driving wheel, being driven by the 3 kW electrical motor mounted on the carriage, so the tyre wheel moved the carriage along the rig soil channel. Driving wheel speed rot/min 20 30 40 Table 2 Main working parameters of the test rig with driving wheel Soil Wheel Carriage Driving Driving penetration load speed wheel slip wheel resistance traction force MPa N m/s % N 500 0.50 17 230 0,2 750 0.51 15 360 1000 0.53 14 580 500 0.51 15 290 0,4 750 0.52 15 442 1000 0.54 13 610 500 0.75 16 220 0,2 750 0.76 15 350 1000 0.79 12 570 500 0.76 15 285 0,4 750 0.77 14 438 1000 0.79 12 600 500 0.99 15 220 0,2 750 1.01 14 340 1000 1.02 11 560 500 1.01 14 280 0,4 750 1.01 13 410 1000 1.04 10 580 The purpose of these tests was to evaluate the main laboratory rig working parameters for the driving wheel condition of service. Research has been conducted in order to evaluate the effect of the driving wheel rotational speed, penetration resistance of the soil and the wheel load over the speed of the carriage, driving wheel slip and traction force. The results obtained in these experiments are presented in Table 2. Based on the experimental results it was established that the increase of the driving wheel’s rotational speed leads to a significant increase of its travelling speed and also to the decrease of wheel slip.
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 261 By analysing the experimental results it was found that an increased soil penetration resistance is leading to a slightly increased driving wheel travelling speed; this is explained by the fact that for more compact soil the driving wheel-soil adhesion increases, causing the decrease of wheel slip and therefore increasing the carriage travelling speed. It was also concluded that an increased soil resistance to penetration increases the traction force developed by the driving wheel, as a result of the wheel–soil adhesion increase. Regarding the influence of the driving wheel vertical load over the soil, it was established that the rise of this force leads to an increased travelling speed of the driving wheel, and, therefore, of the carriage, due to the increase of wheel- soil adhesion, that makes its slippage to diminish. In all cases, driving wheel slip had values that fell within the limits laid down by agro-technical requirements; these requirements provide that on compacted soil driving wheels slip should not exceed a maximum of 20 %. 4. Conclusions 1. The laboratory test rig with soil channel, aiming to study the wheelground interaction, is a very important achievement, absolutely necessary in the experimental researches carried out in laboratory conditions regarding this interaction. This laboratory test rig was constructed as a result of the PNCDI II- 52107 research grant. 2. Experimental research carried out with plough body shows that the increase of plough body travelling speed leads to a increase of the towing resistance force and of the specific power consumption (a significant increase of specific power consumption). It may also be noted that an increased soil penetration resistance leads to a notable increase of towing resistance force and of the specific power consumption. 3. It must be emphasized that as the body plough working depth increases, there is a increase of the towing resistance force.Regarding the specific power consumption, it was concluded that: increasing the working depth from 100 mm to 150 mm leads to a slight decrease of the specific power consumption and by increasing the working depth from 150 mm to 200 mm it is found a significant increase of the specific power consumption. These variations may be thus explained: the working depth increase leads to a increase of specific power consumption for rolling over and breaking down the displaced slice of soil. 4. Based on the experimental results, it was established that the increase of the driving wheel rotational speed leads to a increase of its travelling speed and traction force and a a decrease of the wheel slip. It was also established that an increased soil penetration resistance resulted in increased driving wheel speed and traction force, while its slip decreased.
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BULETINUL INSTITUTULUI POLITEHNIC D
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