Predicting Penetration Rates of Plows with Combined Vertical and Fore-Aft Vibration and Flexible Blades 700040

Three soil models are developed which retain much of the simplicity of a previously proposed modified Coulomb soil model, yet which allow penetration rates to be predicted for vibrating plows that combine suitably phased vertical blade motion with fore-aft blade vibration. In addition a method is developed for accounting for blade flexibility in a manner which is compatible with the simplicity of these soil models.The main new soil model is based on the assumption of a constant amount of energy being necessary to penetrate a unit volume of soil.