UTILIZATION OF DIFFERENT SOIL SINKAGE PLATES TO PREDICT TIRE INFLATION PRESSURE AND ITS SINKAGE UNDER DIFFERENT SOIL CONDITIONS | ||||
| Misr Journal of Agricultural Engineering | ||||
| Article 2, Volume 29, Issue 2, April 2012, Page 531-552 PDF (764.2 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjae.2012.102153 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| A.M.F Bahnasy | ||||
| Senior Researcher, Agric. Eng. Res. Inst. Dokki Giza, Egypt. | ||||
| Abstract | ||||
| This paper presents an algorithm for adapting the tire inflation pressure of off road vehicles operating on rough terrain to reach tire floatation. The algorithm accounts for dynamic effects of tire sinkage and tire deflection in the vehicle/terrain interaction. Extensive simulation and experimental results demonstrate the method effectiveness. In order to evaluate the variability of sinkage measurements using three different shapes (rectangular, ellipse and circular plates) on a uniformly prepared sand soil with three different bulk densities of 1200, 1270 and 1315 kg. m-3 and three different moisture contents, a set of three plates having dimensions of (34*85), (45*64) and (40*61.6) mm for rectangular plates, (40*97), (37*92) and (33*52) for ellipse plates, 27.5, 26.7 and 30 mm radius for circle plates were tested for pressure vs sinkage results five times each in four test series. From the individual plate sinkage vs. pressure results, the constants kc, kφ and n in Bekker's sinkage equation were evaluated using groups of three plates and a least squares best fit procedure. The instrumentation of the sinkage device and the measurements of the response of sand to normal loading in laboratory conditions are presented. The sinkage tests were conducted by means of static weight driven loading equipment. The vertical plate sinkage and the load applied to the plate were measured. From the experimental data, the sinkage parameters kc, kf and n in Bekker pressure-sinkage equation could be derived. The results showed that the used experimental device was suitable for identifying the soil sinkage parameters in relation to off-road mobility. The purpose of this study is to estimate the proper tire inflation pressure according to soil conditions. The soil conditions are varied from hard to soft as soil bulk density and soil moisture are changed the results showed that the constants kc, kφ and n are changed as soil moisture and bulk density change. The highest value for kc and kφ were found at the lower soil moisture content and bulk density. Values of exponent n ranged from 1 to 1.53 according to soil condition and sinkage plate shape. The constants in Bekker's sinkage equation derived from rectangle and ellipse shape are very closed each other than they get from the circle sinkage shape. | ||||
| References | ||||
|
Abu-Hamdeh, N. H and R. C. Reeder (2003). Measuring and predicting stress distribution under tractive devices in undisturbed soil. Biosys. Eng., 85: 493-502.
Bahnasy, A.M.F. (2004). Predicting rolling resistance for tractors using soil property. Modern Technology in Agric. Eng. Research and Application, th 12th Annual Conference of Misr Society of Agric. Eng., 4-5 October 2004.
Bekker, M. G. (1960). Off- the-road locomotion Ann Arbor University of Michigan Press, PP200
Bekker, M. G. (1969).Introduction to terrain-vehical systems. Ann Arbor University of Michigan Press, PP820.
Botero, O. and P.H. Gotteland (2005). Modelling of sinkage tests in tilled soils for mobility study. Soil and Tillage Research, 80(1-2):215-231.
Benoit O, Gotteland PH (2006). Sinkage Tests for Mobility Study, Modeling and Experimental Validation. J. Terramechanics, 43: 451- 467.
Brooks CA, K, Iagnemma (2005). Vibration-Based Terrain Classification for Planetary Exploration Rovers, IEEE Trans. On Robotics,
Dwyer, M.J. (1984). Tractive performance of wheeled vehicles. Journal of Terramechanics 21(1):19-34.
Defossez, P and Richard (2002). Models of soil compaction due totraffic and their evaluation. Soil till. Res. 67:41-64
Gee-Clough. D. 1978. A comparison of the mobility number and Bekker approaches to the traction mechanics and recent advances in both methods at the N.I.A.E. Proceedings of the 6th International ISTVS conference, Vienna, Austria, August 22-25, 1978. II:735-755.
Rashidi, M., A. Keyhani and A. Trabatabaeefar (2006). Muliplate penetration test to predict soil pressure sinkage. Int. J. Agri. Biol., Vol. 8 (1) PP: 1:9
Lee, D.R. and K.U. Kim (1977). Effect of inflation pressure on tractive performance of bias tires. Journal of terramechamics 34(3):187-208.
Kaje L. 1968. Terrain trafficability. Helsinki. 53 p.
McKyes, E. and Fan, T. (1985). Multiplate penetration tests to determine soil stiffness moduli. Journal of Terramechanics, 22, 157-162.
McKyes, E. (1985). Soil cutting andtillage. Elsevier, pp. 160
Maclaurin, E.B (1990). The use of mobility nimefs to describe thhe in field tractive performance of pneumatic tires. Proceedings of the 10th International ISTvS Conference. Kobe. Japan August 20-24, 1990 PP: 177-186.
Mohamed, A.A.I (2007). Evaluation of different methods for estimating the rolling resistance of agricultural tractors based on bekker’s soil parameters. Journal of Agricultural Sciences Mansoura University. Volume 32 No. (8) : 6329-6346
Pope RG (1969). The Effect of Sinkage Rate on Pressure Sinkage Relationship and Rolling Resistance in Real and Artificial Clays. J. Terramechanics, 6: 31-38.
Reece, A.R. (1964). Curve fitting technique in soil vehicle mechanics. Journal of Terramechanics, 1, 44-55.
Saarilahti, M., (1997a). Suitability of mobility models for evaluating environmental effects of terrain transport. Proceedings of the 7th ISTVS European Conference, Ferrara, Italy 8-10.10.1997: 425-432.
Wong, J. Y. (1980). Data processing methodology in the characterization of the mechanical properties of terrain. Journal of Terramechanics, 17, 13-41.
Wong JY (2001). Theory of Ground Vehicles, 3rd Edition, Wiley, New York.
Wismer, R. D. & Luth, H. J. 1973. Off-road traction prediction for wheeled vehicles. Transaction ASAE 17(1):8-10,14.
Yu, T. (2005). The tractive performance of afriction-based prototype track. Ph.D Thesis, Civil and Biosystsems Eng. Dept., University of Pretoria, South Africa.
Zadeh, S.R.A. (2006). Modeling of energy requirements by a narrow tillage tool. PhD Thesis, Dept. of agri. And Bioresource Eng. Univ. of Saskstchewan, Sakatoon, Canada: 190p. | ||||
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