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A computer simulation was carried out to determinate the optimum capacity of bulk type trailer which is used as a tractor attachment. Soil physical properties, such as soil moisture content, bulk density, soil hardness and soil texture were measures in the 10 major rice production area for computer simulation. Mathematical model which include soil physical properties and vehicle factor was used for computer silmulation. Most of the soil texture of the investigated area was silty loam, Soil moisture content ranged between 30 and 40% mostly. Soil bulk density was in the range of 1,500 to 1,700 kg/m^3. Soil hardness ranged between 1 to 18 kg/cm^2. Soil hardness incorporate the effects of many soil physical properties such as moisture content, texture and bulk density, and so the range of soil hardness was greater than any other physical properties. The capacity of bulk type trailer was above 3000 kgr for the most of the investigated area. and mostly in the range of 4000 to 6000 kgr depending upon the slip. But for the soft soil area such as Andong and Namyang. tractor itself had mobility problem and showed minus trailer capacity for some places. For this area, the capacity of bulk type trailer ranged between 1000 and 2000 kgr mostly. so bulk type trailer should be designed as a small capacity compared to the other area.
This study was conducted to develop the mathmatical model for predicting the side thrust which is generated by the shearing action on the vertical surfaces of the sides of the track. Experiments were conducted with the three different shear plates with grouser length of 1, 3 and 5 cm for two different soil condition using soil bin system. The measured side thrust were compared with the values predicted by the new model developed in this study and by Bekker's model respectively. The values of side thrust predicted by the new model were more close to the measured values than those of the side thrust predicted by Bekker's model . The total thrust measured were also compared with the values predicted by the conventional model which considers only bottom thrust effect and by the new model which contains not only bottom thurst but side thrust effect. The values of the thrust predicted by conventional modelwere lower than measured values for both of the soil conditions and the three levels of grouser length. The maximum errors of conventional model were increased with the increase of grouser length. but the values of the total thrust predicted by the model developed in this study were well matched to the measured ones for both of the soil conditions and the three levels of grouser lengths.