The effect of wheel width on the rolling resistance of rigid wheels in wet paddy soils | |
| Author | Gupta, Pradeep Kumar |
| Call Number | AIT Thesis no. AE-82-05 |
| Subject(s) | Wheels Trafficability |
| Note | A thesis submitted in partial fulfilment of the requirement for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Soil-bin studies were conducted to study the rolling resistance of towed rigid wheels in puddled wet clay soils. The effect of wheel width on the rolling resistance and wheel sinkage, under 3.92 kN/m width of wheel vertical load, is shown to be very strong; coefficient of rolling resistance increasing rapidly with width. Under 0.392 kN vertical load, drag force per unit of wheel width, coefficient of rolling resistance and wheel sinkage decreased with width. The vertical soil movement along wheel sides increased considerably with width under 3.92 kN/m width of wheel vertical load. The statement of WONG and REECE about soil movement did not hold true. BEKKER's theory resulted in average estimations of drag force and sinkage, while GEE-CLOUGH's predictions made slightly higher than average estimations, under 3.92 kN/m width of wheel vertical load. UFFELMANN's theory underestimated drag force at higher wheel width. Poor correlation was found between measured values of coefficient of rolling resistance and Freitag's clay number. Changing the factor, correcting for width to diameter ratio, from 0.5 to 3.0 gave 90% correlation with the measured data. BEKKER's expression of bulldozing resistance overestimated 3 to 4 times approximately. Very good prediction of measured values of coefficient of rolling resistance was found using an expression comprising the square root of the sinkage/diameter ratio multiplied by a factor correcting for width/diameter ratio. Dynamic values of soil properties K and n, calculated using observed values of drag force and sinkage, were found to be very high as compared to the values obtained by static methods. |
| Year | 1982 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Gee-Clough, D. |
| Examination Committee(s) | Singh, Gajendra ; Koike, Masayuki |
| Scholarship Donor(s) | Kubota Limited, Japan |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1982 |