Data/hora: 12/06/2024 15:39:00

Provedor de dados: 	70	
País: 	Brazil	
Título: 	Electrically driven fertilizer applicator controlled by fuzzy logic	
Autores: 	Garcia,Angel P.; Cappelli,Nelson L.; Umezu,Claudio K.	
Data: 	2014-06-01	
Ano: 	2014	
Palavras-chave: 	Fertilizer applicator; Agricultural machinery; Closed-loop control.	
Resumo: 	The present study shows the development, simulation and actual implementation of a closed-loop controller based on fuzzy logic that is able to regulate and standardize the mass flow of a helical fertilizer applicator. The control algorithm was developed using MATLAB's Fuzzy Logic Toolbox. Both open and closed-loop simulations of the controller were performed in MATLAB's Simulink environment. The instantaneous deviation of the mass flow from the set point (SP), its derivative, the equipment´s translation velocity and acceleration were all used as input signals for the controller, whereas the voltage of the applicator's DC electric motor (DCEM) was driven by the controller as output signal. Calibration and validation of the rules and membership functions of the fuzzy logic were accomplished in the computer simulation phase, taking into account the system's response to SP changes. The mass flow variation coefficient, measured in experimental tests, ranged from 6.32 to 13.18%. The steady state error fell between -0.72 and 0.13g s-1 and the recorded average rise time of the system was 0.38 s. The implemented controller was able to both damp the oscillations in mass flow that are characteristic of helical fertilizer applicators, and to effectively respond to SP variations.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000300014	
Editor: 	Associação Brasileira de Engenharia Agrícola	
Relação: 	10.1590/S0100-69162014000300014	
Formato: 	text/html	
Fonte: 	Engenharia Agrícola  v.34 n.3 2014	
Fonte: 	info:eu-repo/semantics/openAccess