Off-campus South Dakota State University users: To download campus access theses, please use the following link to log into our proxy server with your South Dakota State University ID and password.
Non-South Dakota State University users: Please talk to your librarian about requesting this thesis through interlibrary loan.
Thesis - University Access Only
Master of Science (MS)
A tillage implement that uses a revolutionary method to loosen the soil was built and tested at the Agricultural Engineering Department of South Dakota State University. The tine of the implement moves in a triangular like manner and therefore the implement is called the Deltavator. The motion causes the soil to fail due to tensile loading unlike conventional tillage methods which cause the soil to fail due to compressive loading. The failure due to tensile loading requires less force since soil is strong in compression but weak in tension. The five treatments that were tested included: 1. an undriven tine with a fixed flat shovel; 2. an undriven tine with a fixed tilted shovel; 3. a tine that was driven slower than ideal speed; 4. a tine that was driven at the ideal speed; and 5. a tine that was driven faster than the ideal speed. The shovel was free to pivot during the driven treatments. Treatment 1 was considered to be most similar to a conventional subsoil tillage implement and the motion of the shovel in treatment 4 simulated the theoretical Deltavator motion most accurately. Five repetitions were conducted of each treatment and the rolling resistance. The order of testing was randomly generated. The testing showed that the motion of the deltavator caused a distinct loading cycle which · had the same frequency as the motion of the tine in both treatment 3 and treatment 4. Treatment 4 had an average specific draft of 7.25 kN/m which was 15.7% less than the average specific draft of treatment 1 which was 8.60 kN/m. This difference was statistically significant at the 5 percent level.
Library of Congress Subject Headings
Tillage -- Equipment and supplies -- Design and construction
Agricultural implements -- Design and construction
South Dakota State University
Appelen II, John T., "Development and Design of the Deltavator Tillage Implement" (1992). Electronic Theses and Dissertations. 5737.