Reference : TEST AND EVALUATION OF TWO PROCESS CONTROL STRATEGIES FOR ADAPTING DIRECT INJECTION PEST...
Scientific congresses and symposiums : Unpublished conference
Engineering, computing & technology : Multidisciplinary, general & others
Life sciences : Agriculture & agronomy
http://hdl.handle.net/2268/92783
TEST AND EVALUATION OF TWO PROCESS CONTROL STRATEGIES FOR ADAPTING DIRECT INJECTION PESTICIDE APPLICATION TO SMALL SCALE FARMS
English
[en] Essai et évaluation de deux tratégies de contrôle pour adapter la technique d'injection directe à de petites exploitations
El Aissaoui, Abdellah mailto [Université de Liège - ULg > > > Doct. sc. agro. & ingé. biol.]
Lebeau, Frédéric mailto [Université de Liège - ULg > Sciences et technologie de l'environnement > Mécanique et construction >]
Destain, Marie-France mailto [Université de Liège - ULg > Sciences et technologie de l'environnement > Mécanique et construction >]
El bahir, lhoussain [ENSA, Po box 575,Gueliz, Marrakech, Morocco > > > >]
Houmy, Karim [IAV Hassan II, Po box 6202, Rabat-Instituts, Rabat, Morocco > > > >]
13-Jan-2010
9
No
No
International
XVIIth World Congress of the International Commission of Agricultural and Biosystems Engineering
du 13 au 17 juin 2010
CIGR
Québec
Canada
[en] Feedback control ; direct injection ; variable rate application ; small farms
[en] Small scale farmers, in developing and in some developed countries, are faced to actual difficulties of applying pesticides accurately and safely on vegetables crops. They mainly use hand operated sprayers. As an issue, a small direct injection system based on a five meter's parallel boom layout was designed to improve chemical application. The boom layout was optimised to obtain the same minimal lag time response for the ten nozzles. The dynamic of the system was modelled using SimulinkTM as first order model with delay. Two control strategies were implemented using PID feedback control loops to monitor tracer injection (fluorescing) proportionally to simulated forward speed (from 0.6 to 1.2 m/s) and to control the constant operating pressure (constant carrier flow strategy) or the variable operating pressure proportionally to the injected chemical amount (variable total flow strategy). Different forward speed changes were induced using steps up and down, ramps, sine waves and sweeps solicitations to evaluate the control feedback. The system stability was tested for its ability to maintain the expected concentration and application rate. The results show that the lag time remains less than 3 s (dead time < 2s , time constant < 1s) and the system keeps stable for the maximal speed variation and acceleration tested (∆V=200%, a= 0.48 m/s2) which induce less than 10% variation of application rate.
CTB
Researchers ; Professionals
http://hdl.handle.net/2268/92783

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