A MATHEMATICAL MODEL TO PREDICT THE TRAJECTORY OF SOIL MOTION ON A MOLDBOARD PLOW SURFACE

摘要

A mathematical model was developed to determine the soil trajectory of motion on the moldboard plow surface. With the use of the model, upper limiting trajectory lines of soil particle travel can be calculated based on the shape of the moldboard plow surface. Also, lower limiting trajectory lines can be determined as a function of the moldboard shape, the apparent soil-metal friction coefficient and the plow speed of travel. The use of the model can be extended to the approximation of the soil reaction forces occurring during the plowing operation. A limited laboratory experiments were conducted to verify the validity of the model. The moldboard shape factors used were derived from the coordinate of points describing the contours of the plow surface as measured by a profilograph.