Granular fertiliser application rate control system with integrated output volume measurement

Tola, ElKamil; Kataoka, Takao; Burce, Marlowe Edgar; Okamoto, Hiroshi; Hata, Shun-ichi

doi:10.1016/j.biosystemseng.2008.09.019

Cited by 35 publications

(25 citation statements)

References 2 publications

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“…To set the application rate, a linear relationship between the angular speed of the shaft and the average mass flow rate was used. TOLA et al (2008) developed a proportional type controller and the performance of the controller was carried out by means of electric motor acting on the lever arm of a variable gearbox and, consequently, the application rate. JAFARI et al (2010) and YUAN et al (2010) used a driver that worked in a DC electric motor to drive the seed and the fertilizer feeder, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…JAFARI et al (2010) and YUAN et al (2010) used a driver that worked in a DC electric motor to drive the seed and the fertilizer feeder, respectively. This type of engine has the ability to quickly change the shaft's angular speed, with the elements of the system being easy to install and perform when compared to hydraulic or mechanical actuators, such as those used by CAPPELLI (2006) andTOLA et al (2008), respectively. For the development of more advanced controllers, which act not only in controlling the angular speed of the feeder's axis, but also consider its characteristic oscillation, it is necessary to develop a mathematical model for simulations with different control strategies without the need of testing the real physical system (KIM et al, 2008, SAEYS et al, 2008.…”

Section: Introductionmentioning

confidence: 99%

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

García¹,

Cappelli

Umezu³

2012

Eng. Agríc.

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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 ( ) for the motor drive shaft. The input model was 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 (V A ) controller. By introducing a sinusoidal excitation signal in V A with amplitude and delay phase optimized and varying during an operation cycle, it is obtained a reduction of 29.8% in the CV (constant V A ) 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.KEYWORDS: seeder fertilizer drill, modeling, precision agriculture. DOSADOR HELICOIDAL DE FERTILIZANTE GRANULAR: MODELO MATEMÁTICO E SIMULAÇÃO DA DINÂMICARESUMO: O objetivo deste trabalho foi modelar matematicamente e simular o comportamento dinâmico de um dosador helicoidal de fertilizantes (DHF) a fim de utilizá-lo em aplicação a taxas variáveis (ATV)e reduzir o coeficiente de variação (CV) da aplicação, propondo uma forma de atuação na velocidade angular de acionamento ( ) do seu eixo. A entrada do modelo foi e a resposta foi a vazão mássica de fertilizante em função de suas características construtivas, densidade do fertilizante, fator de enchimento e posição do fim do helicoide. O modelo foi usado na simulação de um sistema de controle em malha aberta, com o acionamento do DHF feito por meio de um motor elétrico com atuação na tensão de armadura (V A ). Introduzindo-se um sinal de excitação senoidal em V A com amplitude e defasagem otimizada, consequentemente variando-se durante um ciclo de operação, obteve-se redução no CV de 29,8 % (V A constante) para 11,4 %. O desenvolvimento do modelo matemático foi um primeiro passo no sentido da introdução de acionamento elétrico e de sistemas de controle em malha fechada, visando à aplicação de DHF com baixos índices de CV em ATV.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

García¹,

Cappelli

Umezu³

2012

Eng. Agríc.

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“…TOLA et al (2008) using a slotted rotor and fertilizer as a raw material, achieved a relative error within a range of ±5%.…”

Section: Resultsmentioning

confidence: 97%

“…In agricultural machinery, conventional control systems, such as those used by UMEZU & CAPPELLI (2006), KIM et al (2008), TOLA et al (2008), are generally used. However, as these machines generally perform nonlinear processes (GARCIA et al, 2012), the design requirements can not be satisfied when conventional control methods, based on linear process models, are used.…”

Section: Introductionmentioning

confidence: 99%

Electrically driven fertilizer applicator controlled by fuzzy logic

2014

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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.KEYWORDS: fertilizer applicator, agricultural machinery, closed-loop control. DOSADOR DE FERTILIZANTE ACIONADO ELETRICAMENTE E CONTROLADOPOR LÓGICA FUZZY RESUMO: Este trabalho apresenta o desenvolvimento, a simulação e a implementação de um sistema de controle, em malha fechada, baseado em lógica fuzzy, para regular e uniformizar a vazão mássica aplicada por um dosador de fertilizante do tipo helicoidal. A estratégia de controle foi desenvolvida, utilizando-se da ferramenta "Fuzzy Logic Toolbox", do programa MATLAB. Foi simulado, em linguagem Simulink -MATLAB, o sistema operando em malha aberta e em malha fechada. A variável manipulada pelo controlador foi a tensão do motor elétrico de corrente contínua (MECC), e as suas variáveis de entrada foram: o erro e a variação do erro entre a vazão mássica atual aplicada e o valor de referência (VR), além da velocidade de deslocamento e a variação da velocidade de deslocamento do equipamento. A sintonia e o projeto das regras das funções de pertinência da lógica fuzzy foram realizados por meio de simulações, além de verificação de que o sistema foi capaz de responder às mudanças no VR. Nos testes experimentais, o coeficiente de variação da vazão mássica ficou entre 6,32 e 13,18%, o erro em regime estacionário variou de -0,72 a 0,13 g s -1 e o tempo de resposta médio foi de 0,38 s. O sistema de controle foi capaz de reduzir a característica oscilatória da vazão mássica aplicada pelo mecanismo dosador e foi eficiente em acompanhar as mudanças do VR.PALAVRAS CHAVE: adubadora, máquinas agrícolas, controle em malha-fechada.

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“…The constant rate of fertilizer application is inefficient and leads to overfertilizing certain regions and under-fertilizing others, not meeting the actual nutrient demand. Increase in rate of fertilizer application in general increases crop yield up to an optimum level, but extra fertilizer is under-utilized or mobilized 2 . The application of fertilizers can be varied based on analysis of information collected from the field.…”

mentioning

confidence: 99%

Digital Map-Based Site-Specific Granular Fertilizer Application System

Chandel¹,

Mehta²,

Tewari³

et al. 2016

Current Science

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Variable rate application is the process of applying different rates of crop inputs according to the variability within an agricultural field. Variable rate fertilizer application is a technology that regulates the fertilizer application rate based on site-specific needs within a field. A GPS-based variable rate fertilizer application (VRFA) system was developed, which consisted of a differential global positioning system (DGPS), micro-processor, micro-controller, DC motor actuator, power supply, threaded screw arrangement and fluted roller metering mechanism. The digital soil nutrient availability and application maps for targeted yield were also developed. DGPS was used for real-time identification of grids. Based on the microcontroller algorithm, application rates were varied by changing the feed roller exposure length. The observed fertilizer application rate was 5 and 300 kg/ha for exposure length of 0 and 44 mm respectively. The results indicate that the fertilizer application rate changes according to the prescribed application rate at the identified grid with coefficient of variation of 11.7-15%. The values of root mean square error and relative difference of the system for different levels of application rates were 2.62 and 3.71 respectively. It can be concluded that the developed VRFA system closely meets the target fertilizer application rate at the selected grid point.

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Granular fertiliser application rate control system with integrated output volume measurement

Cited by 35 publications

References 2 publications

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

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

Electrically driven fertilizer applicator controlled by fuzzy logic

Digital Map-Based Site-Specific Granular Fertilizer Application System

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