DYNAMIC TRACTION OF A MECHANIZED SET BASED ON TECHNICAL AND OPERATIONAL PARAMETERS

Leite, Daniel M.; Fernandes, Haroldo C.; Teixeira, Mauri M.; Cecon, Paulo R.; Furtado, Marconi R.

doi:10.1590/1809-4430-Eng.Agric.v37n3p484-492/2017

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Scientific Papers, Agricultural Machinery Management • Eng. agríc. 37 (03) • May-Jun 2017 • https://doi.org/10.1590/1809-4430-Eng.Agric.v37n3p484-492/2017 copy

DYNAMIC TRACTION OF A MECHANIZED SET BASED ON TECHNICAL AND OPERATIONAL PARAMETERS

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The objective of this study was to evaluate and model the traction performance parameters of a tractor 4x2 FWD, according to the tractor speed, the internal pressure and the type of tires construction. For each type of tire construction was assembled an experiment in which we evaluated the influence of internal pressures of the front and rear tires and the speed of the mechanical assembly. It was found that the sliding of the diagonal run, presented significant effect in all variables analyzed, since the radial showed no influence of the factors evaluated. The power available in the drawbar was higher when the tractor was equipped for radial tires. The response variables, fuel consumption schedule and specific fuel consumption were more sensitive to the speed of the internal tire pressure. The fuel consumption per area worked, did not affect the analyzed variables. As for the effort prediction models in the tractor drawbar, it was only possible for diagonal run, which are influenced by speed and internal pressure levels of the front and rear tires.

KEYWORDS:
harrow disc; instrumentation; traction performance

Speeds (km h⁻¹)	Speeds (m s⁻¹)	Gear	Engine rotation (rpm)
4.00	1.11	3A	2,400
4.81	1.34	1B	2,250
6.00	1.67	2B	2,400
7.19	2.00	3B	2,000
8.00	2.22	3B	2,400

Tire	Variables	Code	-1.68	-1	0	1	1.68
Diagonal	Speed (m s⁻¹)	S	1.11	1.34	1.67	2.00	2.22
	Front pressure (kPa)^* * Diagonal tires: 68.95 kPa = 10.0 psi; 82.94 kPa = 12.0 psi; 103.42 kPa = 15 psi; 123.90 kPa = 18.0 psi and 137.90 kPa = 20.0 psi. Radial Tires: 137.90 kPa = 20.0 psi; 151.89 kPa = 22.0 psi; 172.37 kPa = 25.0 psi; 192.85 kPa = 28.0 psi and 206.84 kPa = 30.0 psi.	Fp	68.95	82.94	103.42	123.90	137.90
	Rear pressure (kPa)^* * Diagonal tires: 68.95 kPa = 10.0 psi; 82.94 kPa = 12.0 psi; 103.42 kPa = 15 psi; 123.90 kPa = 18.0 psi and 137.90 kPa = 20.0 psi. Radial Tires: 137.90 kPa = 20.0 psi; 151.89 kPa = 22.0 psi; 172.37 kPa = 25.0 psi; 192.85 kPa = 28.0 psi and 206.84 kPa = 30.0 psi.	Rp	68.95	82.94	103.42	123.90	137.90
Radial	Speed (m s⁻¹)	S	1.11	1.34	1.67	2.00	2.22
	Front pressure (kPa)^* * Diagonal tires: 68.95 kPa = 10.0 psi; 82.94 kPa = 12.0 psi; 103.42 kPa = 15 psi; 123.90 kPa = 18.0 psi and 137.90 kPa = 20.0 psi. Radial Tires: 137.90 kPa = 20.0 psi; 151.89 kPa = 22.0 psi; 172.37 kPa = 25.0 psi; 192.85 kPa = 28.0 psi and 206.84 kPa = 30.0 psi.	Fp	137.90	151.89	172.37	192.85	206.84
	Rear pressure (kPa)^* * Diagonal tires: 68.95 kPa = 10.0 psi; 82.94 kPa = 12.0 psi; 103.42 kPa = 15 psi; 123.90 kPa = 18.0 psi and 137.90 kPa = 20.0 psi. Radial Tires: 137.90 kPa = 20.0 psi; 151.89 kPa = 22.0 psi; 172.37 kPa = 25.0 psi; 192.85 kPa = 28.0 psi and 206.84 kPa = 30.0 psi.	Rp	137.90	151.89	172.37	192.85	206.84

Tire	Equation	R²
Diagonal	S_f = 3.148^ * and **** Significant at 1% and 5% level, respectively, by the t test. Sf– Sliding of the front wheels (%); DS – Displacement speed (m s−1); Pf – Front internal pressure (kPa). + 3.211^* * and Significant at 1% and 5% level, respectively, by the t test. Sf– Sliding of the front wheels (%); DS – Displacement speed (m s−1); Pf – Front internal pressure (kPa). DS + 0.026^ * and ** Significant at 1% and 5% level, respectively, by the t test. Sf– Sliding of the front wheels (%); DS – Displacement speed (m s−1); Pf – Front internal pressure (kPa). Pf	0.63
Radial	S_f = 7.803	-

Tire	Equation	R²
Diagonal	S_r= 6.936^* * and ** Significant at 1% and 5% level, respectively, by the t test. Sr– Sliding of the rear wheels (%); DS – Displacement speed (m s−1); Pf and Pr – Front and rear internal pressure respectively (kPa). + 2.924^* * and Significant at 1% and 5% level, respectively, by the t test. Sr– Sliding of the rear wheels (%); DS – Displacement speed (m s−1); Pf and Pr – Front and rear internal pressure respectively (kPa). DS + 0.025^ * and Significant at 1% and 5% level, respectively, by the t test. Sr– Sliding of the rear wheels (%); DS – Displacement speed (m s−1); Pf and Pr – Front and rear internal pressure respectively (kPa). Pf – 0.021^ * and ** Significant at 1% and 5% level, respectively, by the t test. Sr– Sliding of the rear wheels (%); DS – Displacement speed (m s−1); Pf and Pr – Front and rear internal pressure respectively (kPa). Pr	0.68
Radial	S_r = 8,404	-

Tire	Equation	R²
Diagonal	DP_d = 13.476^* * and ** Significant at 1% and 5% level, respectively, by the t test. DPd– demanded power in the drawbar (kW); DS – Displacement speed (m s−1); Pf and Pr – Front and rear internal pressure respectively (kPa). - 9.647^* * and Significant at 1% and 5% level, respectively, by the t test. DPd– demanded power in the drawbar (kW); DS – Displacement speed (m s−1); Pf and Pr – Front and rear internal pressure respectively (kPa). DS + 0.082^ * and Significant at 1% and 5% level, respectively, by the t test. DPd– demanded power in the drawbar (kW); DS – Displacement speed (m s−1); Pf and Pr – Front and rear internal pressure respectively (kPa). DSPf + 0.095^ * and Significant at 1% and 5% level, respectively, by the t test. DPd– demanded power in the drawbar (kW); DS – Displacement speed (m s−1); Pf and Pr – Front and rear internal pressure respectively (kPa). DSPr – 0.001^ * and ** Significant at 1% and 5% level, respectively, by the t test. DPd– demanded power in the drawbar (kW); DS – Displacement speed (m s−1); Pf and Pr – Front and rear internal pressure respectively (kPa). PfPr	0.71
Radial	DP_d = 12.037	-

Tire	Equation	R²
Diagonal	P_d = −18.360^* * and ** Significant at 1% and 5% level, respectively, by the t test. Pd– power in the drawbar (kW); DS – Displacement speed (m s−1); Pf – Front internal pressure (kPa). + 22.479^* * and Significant at 1% and 5% level, respectively, by the t test. Pd– power in the drawbar (kW); DS – Displacement speed (m s−1); Pf – Front internal pressure (kPa). DS + 0.008^ * and ** Significant at 1% and 5% level, respectively, by the t test. Pd– power in the drawbar (kW); DS – Displacement speed (m s−1); Pf – Front internal pressure (kPa). Pf	0.88
Radial	P_d = −5.483^ * and ** Significant at 1% and 5% level, respectively, by the t test. Pd– power in the drawbar (kW); DS – Displacement speed (m s−1); Pf – Front internal pressure (kPa). + 16.665^ * and ** Significant at 1% and 5% level, respectively, by the t test. Pd– power in the drawbar (kW); DS – Displacement speed (m s−1); Pf – Front internal pressure (kPa). DS	0.84

Tire	Equation	R²
Diagonal	C_h = 2.951^ * and **** Significant at 1% and 5% level, respectively, by the t test. Ch Fuel Consumption per hour (L h−1); DS – Displacement speed (m s−1). + 5.539^* * and ** Significant at 1% and 5% level, respectively, by the t test. Ch Fuel Consumption per hour (L h−1); DS – Displacement speed (m s−1). DS	0.66
Radial	C_h = 3.481^ * and **** Significant at 1% and 5% level, respectively, by the t test. Ch Fuel Consumption per hour (L h−1); DS – Displacement speed (m s−1). + 4.726^* * and ** Significant at 1% and 5% level, respectively, by the t test. Ch Fuel Consumption per hour (L h−1); DS – Displacement speed (m s−1). DS	0.66

Tire	Equation	R²
Diagonal	SFc = 1.272^* * and ** Significant at 1% and 5% level, respectively, by the t test. SFc - Specific Fuel Consumption (L kW−1 h−1); DS -Displacement speed (m s−1), Pr – Rear internal pressure (kPa). - 0.733^* * and Significant at 1% and 5% level, respectively, by the t test. SFc - Specific Fuel Consumption (L kW−1 h−1); DS -Displacement speed (m s−1), Pr – Rear internal pressure (kPa). DS – 0.001^ * and ** Significant at 1% and 5% level, respectively, by the t test. SFc - Specific Fuel Consumption (L kW−1 h−1); DS -Displacement speed (m s−1), Pr – Rear internal pressure (kPa). Pr + 0.164^* * and ** Significant at 1% and 5% level, respectively, by the t test. SFc - Specific Fuel Consumption (L kW−1 h−1); DS -Displacement speed (m s−1), Pr – Rear internal pressure (kPa). DS²	0.92
Radial	SFc = 1.385^* * and ** Significant at 1% and 5% level, respectively, by the t test. SFc - Specific Fuel Consumption (L kW−1 h−1); DS -Displacement speed (m s−1), Pr – Rear internal pressure (kPa). - 0.849^* * and ** Significant at 1% and 5% level, respectively, by the t test. SFc - Specific Fuel Consumption (L kW−1 h−1); DS -Displacement speed (m s−1), Pr – Rear internal pressure (kPa). DS + 0.193^* * and ** Significant at 1% and 5% level, respectively, by the t test. SFc - Specific Fuel Consumption (L kW−1 h−1); DS -Displacement speed (m s−1), Pr – Rear internal pressure (kPa). DS²	0.88

Tire	Equation	R²
Diagonal	E_d = −0.293^* * and ** Significant at 1% and 5% level, respectively, by the t-test. Ed- Efficiency in the drawbar; DS – displacement speed (m s−1); Pr - Rear internal pressure (kPa). + 0.3593^* * and Significant at 1% and 5% level, respectively, by the t-test. Ed- Efficiency in the drawbar; DS – displacement speed (m s−1); Pr - Rear internal pressure (kPa). V + 0.001^ * and ** Significant at 1% and 5% level, respectively, by the t-test. Ed- Efficiency in the drawbar; DS – displacement speed (m s−1); Pr - Rear internal pressure (kPa). Pr	0.88
Radial	E_d = −0.087^ * and **** Significant at 1% and 5% level, respectively, by the t-test. Ed- Efficiency in the drawbar; DS – displacement speed (m s−1); Pr - Rear internal pressure (kPa). + 0.266^* * and ** Significant at 1% and 5% level, respectively, by the t-test. Ed- Efficiency in the drawbar; DS – displacement speed (m s−1); Pr - Rear internal pressure (kPa). DS	0.84

Associação Brasileira de Engenharia Agrícola SBEA - Associação Brasileira de Engenharia Agrícola, Departamento de Engenharia e Ciências Exatas FCAV/UNESP, Prof. Paulo Donato Castellane, km 5, 14884.900 | Jaboticabal - SP, Tel./Fax: +55 16 3209 7619 - Jaboticabal - SP - Brazil
E-mail: revistasbea@sbea.org.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] *Corresponding author. Universidade Federal do Vale do São Francisco/ Petrolina - PE, Brasil. E-mail: daniel.mariano@univasf.edu.br