Auger-type granular fertylizer distributor: Matemathical model and dynamic simulation

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Abstract

The objective of this study was to model mathematically and to simulate the dynamic behavior of an auger-type fertilizer applicator (AFA) in order to use the variable-rate application (VRA) and reduce the coefficient of variation (CV) of the application, proposing an angular speed controller (θ) for the motor drive shaft. The input model was θ and the response was the fertilizer mass flow, due to the construction, density of fertilizer, fill factor and the end position of the auger. The model was used to simulate a control system in open loop, with an electric drive for AFA using an armature voltage (VA) controller. By introducing a sinusoidal excitation signal in VA with amplitude and delay phase optimized and varying θ during an operation cycle, it is obtained a reduction of 29.8% in the CV (constant VA) to 11.4%. The development of the mathematical model was a first step towards the introduction of electric drive systems and closed loop control for the implementation of AFA with low CV in VRA.

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Garcia, A. P., Cappelli, N. L., & Umezu, C. K. (2012). Auger-type granular fertylizer distributor: Matemathical model and dynamic simulation. Engenharia Agricola, 32(1), 151–163. https://doi.org/10.1590/S0100-69162012000100016

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