Modification of the design parameters of scoop type rotary tiller blades for reverse rotation | |
| Author | Rupasinghe, Chintha Priyangani |
| Call Number | AIT Thesis no.AE-05-07 |
| Subject(s) | Rotary tillers--Design and construction Tillage Agricultural implements |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. AE-05-07 |
| Abstract | Four scoop type rotary tiller blades were fabricated by changing design parameters of the horizontal portion of the scoop surface for reverse rotation in order to minimize the retillage during deep tillage achieving low power consumption. Blades with cutting angles 25°, 35°, 45° and 55° were tested with two and four blades per flange and 0.23 and 0.423 m/s forward velocities at two soil moisture conditions; 15.6 % with uniform soil condition after primary tillage and, 27.5 % with five soil clod sizes after primary tillage. In terms of soil tilth, all blades reduced bulk density and cone penetration resistance values in general however, significantly better performances was observed for the blades with angles 45° and 35°. When compared the maximum power and the torque at maximum power, blade with angle 35° showed best performance at both the soil moisture contents, while others were in the order of 45°>55°>25°. Maximum power delivered by the different types of blades was decreased with the moisture content. In general, blade with angle 55° showed shortest backward throwing distance while others showed average backward throwing distance of 465 mm. Blade with angle 35° showed longest backward throwing distance of 660 mm at 0.423 m/s forward velocity in the plots prepared with smaller clods. Blade with angle 35° performed best with lowest power consumption, higher pulverization and backward throwing ability and can be recommended for deep tillage applications with reverse rotation. |
| Year | 2005 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AE-05-07 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Jayasuriya, H.P.W. |
| Examination Committee(s) | Salokhe, Vilas M.; Sharma, A.K.; Canilus, E.C. |
| Scholarship Donor(s) | Government of Nmway (NORAD) |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2005 |