Date of Award
Master of Science
Agricultural and Biosystems Engineering
Stuart J. Birrell
To facilitate "unloading on-the-go", a sensor package mounted to a combine harvester to allow for automatic unloading auger control was desired. A rotating array of four ultrasonic sensors was chosen over cameras because of dusty operating conditions and poor lighting. Static testing was done with the ultrasonic sensor package mounted on the combine harvester unloading auger viewing a wagon load of corn. A feature extraction process was devised which correctly segmented and identified wagon edges from the grain contained in the wagon. Once features were identified, a second order polynomial surface was fitted to the grain to extrapolate the grain surface. The grain fill level was then calculated. With this information, the unloading auger could be automatically turned off and its swing could be automatically controlled to avoid wagon edges and to fill the wagon evenly with grain.
John David Gaard
Gaard, John David, "Grain wagon fill detection using ultrasonic sensors" (2012). Graduate Theses and Dissertations. 12745.