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Auger-type granular fertylizer distributor: matemathical model and dynamic simulation REA
Garcia,Angel P.; Cappelli,Nelson L.; Umezu,Claudio K..
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 (V A) controller. By introducing a sinusoidal excitation signal in V A with amplitude and delay phase optimized and varying θ' during an operation cycle, it is...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Seeder fertilizer drill; Modeling; Precision agriculture.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000100016
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Desenvolvimento e simulação de um sistema avançado de controle ambiental em cultivo protegido AGRIAMBI
Romanini,Carlos E. B.; Garcia,Angel P.; Alvarado,Leonardo M.; Cappelli,Nelson L.; Umezu,Claudio K..
A produção em ambientes protegidos é uma técnica por meio da qual se objetiva proteger flores e hortaliças contra a ação dos elementos meteorológicos que a afetam, além de permitir ambientes favoráveis de produção durante todo o ano, com vantagens produtivas e comerciais. Um fator importante da produção em estufas é o controle da temperaturae da umidade relativa do ar. A automação do controle do ambiente possibilita o aumento da qualidade dos produtos, maior eficiência e uso racional dos recursos. O objetivo do presente trabalho foi desenvolver um sistema de controle de temperatura e umidade relativa do ar para o protótipo de uma ambiente protegido em escala reduzida, utilizando-se dos conceitos da lógica Fuzzy. As variáveis de entrada foram a temperatura...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Microclima; Ambiente protegido; Inferência Fuzzy.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662010001100009
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Electrically driven fertilizer applicator controlled by fuzzy logic REA
Garcia,Angel P.; Cappelli,Nelson L.; Umezu,Claudio K..
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...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fertilizer applicator; Agricultural machinery; Closed-loop control.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000300014
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FERTILIZER METERING MECHANISM WITH HELICAL CONIC CYLINDRICAL THREAD FOR FAMILY AGRICULTURE REA
Galvão,Cezario B.; Albiero,Daniel; Garcia,Angel P.; Monteiro,Leonardo de A..
ABSTRACT Small rural farms are important for Brazilian agribusiness, but equipment suitable for distributing fertilizers on these properties is scarce. We studied a new fertilizer metering mechanism for use on the family farm. It combines a helical conic thread with a conventional fertilizer meter in a cylindrical section. The experimental plan was created using a 24 factorial design. An analysis of variance (ANOVA) was also conducted. The mechanism showed a positive result with respect to the uniformity of fertilizer flow (with a coefficient of variation of 3.1-5.8%), longitudinal distribution (with a coefficient of variation of 4%), and different types of fertilizers (in which variations between 2.7 and 3.5% were found).
Tipo: Info:eu-repo/semantics/article Palavras-chave: Distribution of fertilizers; Family agriculture; Helical conic thread.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000600934
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Fuzzy control applied to an electrical power generation system mounted on tractors for driving of agricultural implements REA
Soares,Fabricio T.; Cappelli,Nelson L.; Garcia,Angel P.; Umezu,Claudio K..
ABSTRACT The demand of the agricultural sector for more operationally efficient machines and implements motivated the development of alternatives for driving of this equipment. Aiming an electrical supply to apply in agricultural implements, this study proposes a system that uses the tractor power take off to activate a synchronous generator, using a fuzzy logic controller designed to regulate the generated voltage level. Different control architectures were tested and evaluated by simulations. In the initial stage were evaluated fuzzy PI, fuzzy PD and fuzzy PID controllers of multiple inputs and single output (MISO) and the error of the generated voltage as state variable. Subsequently, it was evaluated a fuzzy PI controller of single input and multiple...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Synchronous generator; Power take off; Electrical implements.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000500846
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IMPORTANCE OF CROP PRODUCTIVITY AND EQUIPMENT LIFETIME IN THE STRATEGIC AND TACTICAL MANAGEMENT OF SUGARCANE HARVESTERS REA
Banchi,Ângelo D.; Garcia,Angel P.; Albiero,Daniel; Galvão,Cezário B.; Favarin,Luis G. A..
ABSTRACT Recently, Brazilian agriculture and the mechanization process have been improved and developed, particularly in sugarcane cultivation. The developed processes should adopt suitable management practices in terms of the technical, economic, and operational logistical aspects. As a management tool, the present study aimed to measure the impact of the accumulated use of harvesters (life in h) and agricultural productivity (Mg · ha−1) on the harvesting operational capacity (HOC). Mathematical modeling was performed on data obtained from eight sugarcane production units, and equations corresponding to the HOC as a function of the harvester's life and the crop agricultural productivity were developed. The equation that best represented the phenomenon was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Performance indicators; Maintenance management; Harvesting operational capacity; Agricultural mechanization.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000500601
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Operating cost of sugarcane harvester in function of agricultural productivity and harvester age AGRIAMBI
Banchi,Ângelo D.; Garcia,Angel P.; Grespan,Andrei; Albiero,Daniel; Favarin,Luis G. A.; Galvão,Cezario B..
ABSTRACT The brazilian agriculture has expanded and improved its techniques in the last decades as well as the mechanization of sugarcane cultivation. Overall, the mechanization cost of this cultivation is the highest of the total cost of production in relation to other crops. That cost consists of several elements such as the cost of the harvester. This study aimed to develop a mathematical model that represents the operational cost of the harvester in relation to its operating life and agricultural productivity, parameters that are associated with its operational capacity. Simulations of this cost were conducted, raging the operating life of harvesters between 0 and 17,900 h, and the agricultural productivity of the cultivation from 50 to 130 Mg ha-1....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Economic performance indicators; Multiple regression; Agricultural management; Agricultural machinery efficiency.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000700552
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Operational management of the cane infield wagon: Analysis of the cost of repair and maintenance AGRIAMBI
Galvão,Cezario B.; Garcia,Angel P.; Albiero,Daneil; Ribeiro,Admilson Í.; Banchi,Ângelo D..
ABSTRACT In the mechanical harvesting of sugarcane, a self-propelled harvester is used in conjunction with an agricultural implement named infield wagon, which has the function of storing and transporting the harvested product. Much of the cost of sugarcane production comes from this operation (30 to 60%). Among the operational costs of agricultural machinery, the cost of repair and maintenance (CRM) is relevant. Therefore, the objective of this study was to determine the parameters of the CRM mathematical model based on the life (hours of use) for the infield wagon, using the method of the American Society of Agricultural and Biological Engineers (ASABE). These CRM models were obtained for two sets of infield wagon from different manufacturers and their...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mechanical harvesting of sugarcane; Management of mechanization; Agricultural costs.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000300218
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THE TECHNOLOGICAL LEVEL OF AGRICULTURAL MECHANIZATION IN THE STATE OF CEARÁ, BRAZIL REA
Albiero,Daniel; Xavier,Reuel S.; Garcia,Angel P.; Marques,Arthur R.; Rodrigues,Ruan L..
ABSTRACT Agricultural mechanization is a significant factor of agricultural modernization, but there are few data on the technological levels of this mechanization in the State of Ceará, Brazil. To study this topic, we designed a structured questionnaire, and interviews were conducted across the state. The survey data made it possible to calculate an index of agricultural mechanization technology and study hypotheses specific to farms of Ceará. The results indicate that the technology levels are different between farms of different sizes: large and medium farms are level I-M5 (automation), while small farms ranged from level IV-M1/M2 (primary/animal) to III-M3 (preliminary). We conclude that public policy for training should be directed at small farms....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural mechanization; Technological level; Technical efficiency; Economic development.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000100133
Registros recuperados: 9
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